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Article

Attenuating Effect of Vitamin E against Silver Nano Particles Toxicity in Submandibular Salivary Glands

by
Mahmoud M. Bakr
1,*,
Mahmoud M. Al-Ankily
2,
Sara M. Shogaa
2 and
Mohamed Shamel
2
1
School of Medicine and Dentistry, Griffith University, Gold Coast, QLD 4215, Australia
2
Faculty of Dentistry, The British University in Egypt, Cairo 11837, Egypt
*
Author to whom correspondence should be addressed.
Bioengineering 2021, 8(12), 219; https://doi.org/10.3390/bioengineering8120219
Submission received: 3 November 2021 / Revised: 29 November 2021 / Accepted: 14 December 2021 / Published: 16 December 2021
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Abstract

:
Silver nanoparticles (AgNPs) are extensively used in many industries due to their superior antimicrobial properties. However, it is evident from many studies that AgNPs has cytotoxic potential through its effect on excessive formation of reactive oxygen species (ROS). The aim of this study was to examine the toxic effect of AgNPs on the submandibular salivary glands and the attenuating effect of vitamin E, as a natural antioxidant, against this toxicity. Thirty Albino rats were divided into 3 groups (n = 10): control group, AgNPs group receiving 2 mg/kg daily for 28 days, and AgNPs and vitamin E group receiving AgNPs the same as the previous group in addition to vitamin E at a dose of 100 mg/kg. Microscopic, ultrastructural, and cytokeratin immune-reactivity examination of the glands were performed. The AgNPs group showed noticeable degeneration in all structures of the gland as evident in the histological and ultrastructural examination. The AgNPs and vitamin E group revealed an improvement of the glandular elements. A significant increase in cytokeratin immune expression was found after comparison of both groups (p = 0.01). This current study shows that vitamin E has powerful antioxidant properties, which can combat the cytotoxic effect caused by AgNPs. Further studies are deemed necessary to confirm this finding using other immunohistochemical markers, such as myosin and E-cadherin.

1. Introduction

In the past few years, silver nanoparticles (AgNPs) have been extensively studied because of their wide commercial use in many products, such as household products [1,2], and in food industry [3,4,5]. Moreover, because of its powerful antimicrobial activity, these nanoparticles are recognized as a resourceful material for the drinking water purification industry [6,7]. Its high chemical stability and relatively low cost are among the main reasons for its popular use [8,9,10]. In addition to the above, AgNPs have multiple beneficial applications in medicine and dental biomaterials [11,12,13,14,15]. Advances in nanotechnology have allowed for the emergence of the term nanomedicine, which allowed for promising applications in laboratory research and biology including drug delivery and catheter coating [16,17,18,19,20,21,22,23,24]. However, many studies have reported potential toxicological effects of AgNPs. Those studies have proposed that AgNPs possess a possible cytotoxic effect through the generation of oxidative stress induced by the overproduction of reactive oxygen species (ROS) in various tissues and pathological conditions including cancer [25,26,27,28,29,30].
ROS are physiological byproducts of cellular biochemical reactions necessary for cellular metabolism. Under normal circumstances, different antioxidant enzyme systems are induced, and they serve to scavenge the formed ROS. However, any imbalance between the antioxidant systems and the ROS might lead to the formation of oxidative stress, which in turn causes damage to cellular organelles as well as to DNA and proteins, resulting in cell death [31,32]. Dietary antioxidants have been shown to be effective in decreasing the toxic effect of AgNPs [33]. Among the previously studied dietary antioxidants is vitamin E as a peroxyl radical scavenger, where it was demonstrated that it can decrease oxidative stress through attenuation of the oxidative cascade and its ability to neutralize ROS, thus protecting the affected organs [34,35,36,37,38,39].
Oral exposure of AgNPs is probably more common than any other routes of administration. AgNPs are used in the water industry for disinfecting drinking water of humans as well as animals. AgNPs can cross the gastrointestinal tract barrier and can be absorbed into the circulation, being translocated to different tissues, where AgNPs could exert their toxic effects [1]. Hence, in the current study, we studied the toxic effect of AgNPs on the submandibular salivary glands. The effect of a natural antioxidant, vitamin E, in combating AgNPs cytotoxicity was also evaluated.

2. Materials and Methods

2.1. Experimental Groups

Thirty adult male albino rats were used in this study (average weight 200 gms). Rats were housed in separate cages, four rats per dated cage, and kept under the supervision of a specialized veterinarian. Rats were kept under good ventilation and an adequate stable diet consisting of fresh vegetables, dried bread, and tap water ad libidum.
The animals were equally distributed into the following groups:
Control group: Rats received I.P injections with aqueous nitrate buffer at a dose of 2 mg/kg/B.W daily for 28 days [40].
AgNPs group: Rats received I.P injections with silver nano particles (AgNPs) at a dose of 2 mg/kg once daily for 28 days [40].
AgNPs and Vitamin E group: Rats received I.P injections with AgNPs at a dose of 2 mg/kg once daily the same as the previous group, in addition to administration of vitamin E by oral gavage at a dose of 100 mg/kg (149 IU) daily for 28 days [41].

2.2. Preparation and Characterization of the Silver Nanoparticles:

The rapid green method was used [42]. It was conducted in the nanotechnology lab in the Faculty of Science, South Valley University—Egypt. Pomegranate fruits were collected from the local market. Silver nitrate (AgNO3, >99.9%) was obtained. All glass-wares and pomegranate fruit were properly washed with de-ionized water and dried in an oven. Fruit peel extract (FPE) of pomegranate were used as a reducing agent for the development of silver nanoparticles. Properly washed 50 g of the fresh peels of the fruit were added to 250 mL of ultra-pure water in a 500 mL Erlenmeyer flask and boiled for 10–15 min. Whatman filter paper (No. 40) was used for filtration of the boiled material to prepare the aqueous fruit peel extract, which was used as such for metal nanoparticle synthesis.
Aqueous solution (1 mL) of silver nitrate solution was prepared and 50 mL of the metal (Ag) ion solution were reduced using 1.8 mL of FPE at room temperature for 5 min. Below this FPE quantity, the solution took more than 10 min to obtain a significant surface plasmon resonance (SPR) for the metal nanoparticles. Spectral analysis for the development of nanoparticles at different reaction conditions was conducted with UV-Vis spectroscopy using a Perkin-Elmer Lamda-45 spectrophotometer and X-ray powder diffraction (XRD). A Transmission Electron Microscope (TEM) JEM-1200 EX, JEOL 1010 was used for analysis of the size and shape of the developed nanoparticles. The average nanoparticle yield for AgNPs prepared from fruit peel extract (FPE) of pomegranate was 0.85 ± 0.4 mg of AgNPs per 1 g fruit peel tissue dry mass.
For TEM measurements, 3 µL of the sample solution were placed on copper grid, making a thin film of sample on the grid, and dried at room temperature for 15 min. Then, the extra sample was removed using the cone of a blotting paper and reserved in a grid box. The presence of elemental silver was determined using energy-dispersive X-ray analysis (EDX) with a Zeiss Evo 50 instrument. The pH of the solution was maintained by 1 N HCl and NaOH. The resulting solutions of the developed nanoparticles of silver were dried at 800 °C for X-ray powder diffraction measurement. X-ray powder diffraction data were acquired by a GBC EMMA diffractometer in the central laboratory at South Valley University.
The AgNPs produced in the current study were spherical, ranging between 10 and 55 nm, and cubical, ranging between 8 and 46 nm in size. The cubical AgNPs were predominant amongst the produced crystals. The spherical AgNPs (10 nm) were isolated and used in the current study.
All specimens were examined through:
(a)
Hematoxylin & Eosin.
(b)
Immunohistochemical examination.
(c)
Electron microscope.

2.3. Image and Statistical Analysis

For descriptive (qualitative) purposes, the ant-cytokeratin staining reaction of the different submandibular salivary gland components of all experimental groups was scored as either:
(−) negative staining reactivity.
(+) weak positive staining reactivity.
(++) moderate positive staining reactivity.
(+++) strong positive staining reactivity.
Image analysis was performed via computer software Leica Quin 500 (LEICA Imaging Systems Ltd., Cambridge, UK) to evaluate the area percentage of cytokeratin immunostaining within the gland. The one-way ANOVA test was used to compare the mean area percent of cytokeratin immuno-expression between the specimens of experimental groups. Pair-wise comparison using the Post Hoc Tukey test was used to compare between each group. SPSS 25.0 for Windows (SPSS Inc., Chicago, IL, USA) was used for statistical analysis.

3. Results

3.1. Histological Examination

Control group: Histological examination of the glands of the control group showed a normal gland architecture, where serous acini and ductal systems all appeared with typical histological structures (Figure 1A,B). AgNPs group: Noticeable degeneration in the acini and duct was evident. There was apparent shrinkage and a reduction in the size and number of all the parenchymal elements including the acini and ducts. The acini were reduced and degenerated with a lot of cytoplasmic vacuolization. The GCTs showed a loss of regular configuration, while the striated ducts showed cytoplasmic vacuolization and loss of basal striations. The excretory ducts showed loss of the pseudo-stratification of their lining. Some other ducts showed thickening in their lining cells. Most ducts showed dilatation in their lumens with stagnant secretion. Connective tissue septa showed marked degeneration with dissociation of the collagen fibers and chronic inflammatory cell infiltrate (Figure 1C,D).
AgNPs and vitamin E group: The vitamin E-treated group showed histological sections, which showed an almost normal architecture with no or little cytoplasmic vacuolization. Striated ducts regained their basal striations, while the excretory ducts possessed cell lining with a pseudostratified columnar epithelium. Some of the ducts showed thickening in their epithelial lining. An increase in the fibrous CT content surrounding the ducts was sometimes recorded (Figure 1E,F).

3.2. Immunohistochemical Examination

Cytokeratin immunoreactivity in the specimens of the control group showed a positive reaction (Figure 2A,B), while those of the AgNPs group revealed a weakly to moderately positive reaction (Figure 2C,D).
The tissue sections of the AgNPs and vitamin E group unveiled a notable increase in cytokeratin immunoreactivity in the acini in comparison to the AgNPs group. On the other hand, a slight upsurge in immunoreactivity was shown in the ducts. However, the immunoreactivity appeared to be comparable to that of the control group (Figure 2E,F). The mean area percent of cytokeratin immunoreactivity in the submandibular salivary glands of all groups is summarized in Scheme 1.
Post Hoc Tukey test comparison between the groups revealed that the difference between the control group and AgNPs + vitamin E group was not significant (p = 0.055). However, a significant decrease was found between the AgNPs and control groups (p = 0.001), and a significant increase was also found between the AgNPs + vitamin E and AgNPs groups (p = 0.001) (Table 1 and Table 2).

3.3. Electron Microscope Examination

The electron microscopic examination of the submandibular salivary glands of the control group showed normal ultrastructural elements (Figure 3). While the examination of glands of the AgNPs group showed severe ultrastructural changes of the secretory portions and ducts as well as the connective tissue stroma. Acini and ducts appeared to be degenerated, where the most frequently observed feature was the appearance of many cytoplasmic vacuolations. Organelles, such as nuclei, mitochondria, and rough endoplasmic reticulum (RER), showed massive degeneration (Figure 4). Glands of the group treated with vitamin E showed noticeable enhancement of the acini and ducts with insignificant changes (Figure 5).

4. Discussion

Several studies have reported the cellular toxicity caused by the increased formation of ROS derived from AgNPs exposure despite their widespread usage in commercial consumer products including drug delivery systems, medical devices, and supplies [43,44]. In fact, AgNPs toxicity has been reported in many tissues, such as liver, kidneys, intestine, and reproductive systems [45,46,47,48]. Oral tissue toxicity following AgNPs exposure has been previously reported in salivary glands and lingual mucosa [29,49]. In the current study, evidence of AgNPs toxicity in the submandibular salivary glands was evident through histological, immunohistochemical, and ultrastructural results.
In the present study, the histological results of the AgNPs group showed obvious deterioration of the gland, evident by the variable degrees of degenerative changes involving most of the acinar and ductal cells. The most noticeable observation was the frequent formation of cytoplasmic vacuolization in the serous acini as well as in the intraglandular ducts. These histological changes were also observed by several studies where rats were intoxicated with AgNPs [29,50]. These findings were explained by Asharni et al. (2009) [51], who found that AgNPs can cause DNA and chromosomal abnormalities. This damage was triggered indirectly by AgNPs, which increases the ROS production, which induces mitochondrial damage and sequentially weakens energy-dependent DNA repair mechanisms. We also suggest that the histological changes that were observed in the GCTs and the striated ducts may have occurred due to the decrease in the metabolic activity of the cells or the reduction in protein synthesis due to the accumulation of AgNPs in the ductal cells as well as their production of free radicals [52].
In the current study, it was observed that the excretory ducts showed a loss of pseudo stratification. These results are similar to those obtained by Shamel et al. (2021) [29], where they found that the excretory ducts of the submandibular salivary glands of albino rats appeared vacuolated and degenerated and lost their pseudo stratification after administration of AgNPs. The ultrastructural results of the AgNPs group support the previously mentioned histological results, which showed severe ultra-structural changes of the secretory portions and ducts as well as the CT stroma. These results agreed with several studies where the ultrastructural results of the parotid glands of albino rats after injection of AgNPs displayed strong cytoplasmic vacuolization and numerous intranuclear and mitochondrial vacuoles of various sizes [50].
Our findings could be clarified by Ma et al. (2015) [53], who reported that AgNPs induce mitochondrial membrane depolarization and subsequently mitochondrial damage. Similarly, a recent study reported that AgNPs can induce cell apoptosis by the mitochondrial-dependent pathway [54]. This study revealed that AgNPs exposure leads to the generation of ROS associated with oxidative and cytotoxic events and subsequently induction of apoptosis [54]. Overproduction of ROS and the activation of oxidizing enzymes lead to cytoskeletal, cell membrane and mitochondrial damage, and germ cell-specific apoptosis [55,56]. All the previous hypotheses can explain the previously stated histological and ultrastructural changes in the foundations of the submandibular salivary glands.
Immunohistochemical localization of cytokeratin in the glands of rats of the AgNPs group with their distorted glandular elements represented a generalized decrease in their staining reactivity to cytokeratin in comparison to the control group, which was statistically significant. This difference regarding the immunohistochemical staining distribution of cytokeratin proteins was the result of atrophic and degenerative changes in the acinar and ductal cells, which were confirmed histologically and ultra-structurally. The reduction of cytokeratin immuno-staining in the glands of the AgNPs group rats compared to the control group signifies a decrease in the cytoplasmic content of cytokeratins, which have a vital role in many cellular interactions, such as cell to cell contact. Cytokeratin also has a role in anchoring the nucleus within the cell and in forming the structure of vital cell organelles, such as the Golgi apparatus [57]. Thus, any disturbance in cytokeratins in the salivary glands might lead to distortion of acini, defective cellular junctions leading to wide intercellular junctions, distorted organelles, and subsequently cell degeneration [58,59].
On the other hand, vitamin E at a dose of 100 mg/kg for 28 days significantly improved the salivary gland structure both histologically and ultra-structurally. The vitamin E-treated group showed signs of recovery where an almost normal texture with no or little cytoplasmic vacuolization was observed in the glandular elements. These results could be explained by the fact that vitamin E is a powerful antioxidant that constrains the production of ROS molecules when fat undergoes oxidation and during the propagation of free radical reactions. It has been found that vitamin E mainly inhibits the production of new free radicals, and at the same time neutralizes the existing free radicals. The previous data could explain the attenuating role of vitamin E against AgNPs toxicity, which is mainly caused by elevated ROS formation [60].
Another explanation for the role of vitamin E is that it provides greater stability to the cell by increasing the lipid content of cell membranes, thus allowing for a more stabilized membrane [61]. Therefore, vitamin E helps membrane repair by averting the formation of oxidized phospholipids that might interfere with the membrane fusion events [62]. On the other hand, there was no significant difference in cytokeratin expression between the vitamin E group and the control group. The cytokeratin expression showed moderate staining immunoreactivity, indicating the improvement noted in the structural and ultrastructural results.
The AgNPs dose used in the current study was according to ElMahdy et al., 2015 [40], who reported that doses ranging from 1–4 mg/kg for 28 days were capable of inducing histopathological alterations through oxidative stress and the creation of chromosomal aberrations in bone marrow cells due to the genotoxicity of AgNPs. Furthermore, the dose used in the current study was relevant to potential human exposure. In addition to the above, Lytvynenko et al., 2017 [63] found similar results in the female reproductive system with AgNPs doses of 2 and 4 mg/kg. A more recent study used the same dose of AgNPs (2 mg/kg) to induce toxicity and degeneration in the parotid salivary gland, which was confirmed by nuclear changes, cytoplasmic vacuolations, and partial blockage in the ductal lumen [50].
The production of size- and shape-specific AgNPs is highly important in usage for different applications due to their unique optical and catalytic properties [64]. It was proven that smaller sized AgNPs showed higher antibacterial properties as well as higher toxicity [65]. Furthermore, the plate-shaped AgNPs had higher antibacterial properties than the spherical and cubic AgNPs [65]. The high variability in AgNPs is not only size and shape dependent; other factors including PH and temperature affect the properties of the produced AgNPs [66]. On the other hand, another study demonstrated that AgNPs’ size did not affect the toxicologic parameters and tissue distribution [67]. All of the above could explain the variability in the results obtained from different studies due to the inconsistency in the physical properties of AgNPs used in each individual study.
The process of functionalizing the AgNPs is important for their long-term stability [68] and biophysical properties [69]. The functional layer of nanoparticles plays an important role in antibacterial properties [70,71]. Furthermore, functionalized AgNPs allowed for more DNA damage when compared to non-functionalized AgNPs, which had less surface area availability and access to cell organelles [72]. In addition to the above, functionalizing AgNPs results in modulation of their bioactivity features including oxidative stress and cellular uptake [73]. Non-functionalized AgNPs allow interaction with different molecules including glucose, which could further alter its properties [74]. Despite functionalized AgNPs having unique properties that are useful in scientific and medical applications including food packaging [75], improvement of antibiotics [76,77], and anti-platelet activity [78], the AgNPs used in the current study were not functionalized to exclude any potential effects of the surface coating and model the human consumption scenario.
The current study serves as a pilot study for further investigations related to AgNPs toxicity on different tissues including tongue papillae, gingiva, alveolar bone, and the periodontal ligament. There are some limitations within the scope of the current study and further research is needed to quantify the amount of ROS produced as a result of AgNPs toxicity and quantifying the amount of damage in the submandibular salivary glands through measurement of the apoptotic rate using flow cytometry and/or apoptotic cell markers. Furthermore, the results obtained from the current study could be compared to the effects of other antioxidants, such as vitamin A and vitamin C, in counteracting the AgNPs toxicity.

5. Conclusions

Within the limitations of the current study, we conclude that AgNPs are capable of causing degeneration in the parenchymal elements of the submandibular salivary glands. This degeneration was evident by the histological and ultrastructural results as well as immunohistochemical localization of cytokeratin. Interestingly, vitamin E ameliorated AgNPs toxicity and restored the degeneration caused by silver nanoparticles (AgNPs) in submandibular salivary glands. Further studies are deemed necessary to confirm this finding using other immunohistochemical markers, such as myosin and E-cadherin, apoptotic markers including Bcl-2, P27, and P53, as well as quantifying apoptosis by using flow cytometry.

Author Contributions

M.M.B.: Conceptualization, funding acquisition, study design, data curation, investigation, formulating the discussion section, project administration, writing—original draft, writing—review and editing. M.M.A.-A.: Validation, data interpretation, formulating the discussion section, writing—review and editing. S.M.S.: Validation, data interpretation, formulating the discussion section, writing—review and editing. Conceptualization, funding acquisition, supervision, writing—review and editing. M.S.: Conceptualization, study design, data curation, investigation, formulating the discussion section, project administration, writing—original draft, writing—review and editing. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Institutional Review Board Statement

A license for animal testing was obtained by the ethical committee of Faculty of Dentistry Ain Shams University, Egypt (license #613-19/10/2020).

Informed Consent Statement

Not applicable.

Data Availability Statement

The data presented in this study are available on request from the corresponding author.

Acknowledgments

The authors are grateful for Shehab Eldin Saber the manager of Centre of Innovative Dental Sciences (CIDS) at the British University in Egypt for providing the microscopic imaging and image analysis used in this study.

Conflicts of Interest

The authors declare no conflict of interest.

References

  1. Deshmukh, S.P.; Patil, S.M.; Mullani, S.B.; Delekar, S.D. Silver nanoparticles as an effective disinfectant: A review. Mater. Sci. Eng. C Mater. Biol. Appl. 2019, 97, 954–965. [Google Scholar] [CrossRef] [PubMed]
  2. Fathy, R.M.; Salem, M.S.E.-D.; Mahfouz, A.Y. Biogenic synthesis of silver nanoparticles using Gliocladium deliquescens and their application as household sponge disinfectant. Biol. Trace Elem. Res. 2019, 196, 662–678. [Google Scholar] [CrossRef] [PubMed]
  3. Rajeshkumar, S.; Malarkodi, C. In Vitro Antibacterial Activity and Mechanism of Silver Nanoparticles against Foodborne Pathogens. Bioinorg. Chem. Appl. 2014, 2014, 581890. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  4. Carbone, M.; Donia, D.; Sabbatella, G.; Antiochia, R. Silver nanoparticles in polymeric matrices for fresh food packaging. J. King Saud Univ. Sci. 2016, 28, 273–279. [Google Scholar] [CrossRef] [Green Version]
  5. Kraśniewska, K.; Galus, S.; Gniewosz, M. Biopolymers-Based Materials Containing Silver Nanoparticles as Active Packaging for Food Applications–A Review. Int. J. Mol. Sci. 2020, 21, 698. [Google Scholar] [CrossRef] [Green Version]
  6. Ferdous, Z.; Nemmar, A. Health Impact of Silver Nanoparticles: A Review of the Biodistribution and Toxicity Following Various Routes of Exposure. Int. J. Mol. Sci. 2020, 21, 2375. [Google Scholar] [CrossRef] [Green Version]
  7. Vance, M.E.; Kuiken, T.; Vejerano, E.P.; McGinnis, S.P.; Hochella, M.F., Jr.; Rejeski, D.; Hull, M.S. Nanotechnology in the real world: Redeveloping the nanomaterial consumer products inventory. Beilstein J. Nanotechnol. 2016, 6, 1769–1780. [Google Scholar] [CrossRef] [Green Version]
  8. Roopan, S.M.; Madhumitha, G.; Rahuman, A.A.; Kamaraj, C.; Bharathi, A.; Surendra, T.V. Low-cost and eco-friendly phyto-synthesis of silver nanoparticles using Cocos nucifera coir extract and its larvicidal activity. Ind. Crop. Prod. 2013, 43, 631–635. [Google Scholar] [CrossRef]
  9. Islam, A.; Jacob, M.V.; Antunes, E. A critical review on silver nanoparticles: From synthesis and applications to its mitigation through low-cost adsorption by biochar. J. Environ. Manag. 2021, 281, 111918. [Google Scholar] [CrossRef] [PubMed]
  10. Farias, C.B.; Silva, A.F.; Rufino, R.D.; Luna, J.M.; Souza, J.E.G.; Sarubbo, L. Synthesis of silver nanoparticles using a biosurfactant produced in low-cost medium as stabilizing agent. Electron. J. Biotechnol. 2014, 17, 122–125. [Google Scholar] [CrossRef] [Green Version]
  11. Rai, M.; Ingle, A.P.; Birla, S.; Yadav, A.; Dos Santos, C.A. Strategic role of selected noble metal nanoparticles in medicine. Crit. Rev. Microbiol. 2016, 42, 696–719. [Google Scholar] [CrossRef] [PubMed]
  12. Wolfram, J.; Zhu, M.; Yang, Y.; Shen, J.; Gentile, E.; Paolino, D.; Fresta, M.; Nie, G.; Chen, C.; Shen, H.; et al. Safety of Nanoparticles in Medicine. Curr. Drug Targets 2015, 16, 1671–1681. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  13. Hofmann-Amtenbrink, M.; Grainger, D.W.; Hofmann, H. Nanoparticles in medicine: Current challenges facing inorganic nanoparticle toxicity assessments and standardizations. Nanomed. Nanotechnol. Biol. Med. 2015, 11, 1689–1694. [Google Scholar] [CrossRef]
  14. Hamouda, I.M. Current perspectives of nanoparticles in medical and dental biomaterials. J. Biomed. Res. 2012, 26, 143–151. [Google Scholar] [CrossRef] [Green Version]
  15. Wong, K.K.Y.; Liu, X. Silver nanoparticles—The real “silver bullet” in clinical medicine? Med. Chem. Comm. 2010, 1, 125–131. [Google Scholar] [CrossRef]
  16. Patra, J.K.; Das, G.; Fraceto, L.F.; Campos, E.V.R.; del Pilar Rodriguez-Torres, M.; Acosta-Torres, L.S.; Diaz-Torres, L.A.; Grillo, R.; Swamy, M.K.; Sharma, S.; et al. Nano based drug delivery systems: Recent developments and future prospects. J. Nanobiotechnol. 2018, 16, 71. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  17. Mauricio, M.D.; Guerra-Ojeda, S.; Marchio, P.; Valles, S.L.; Aldasoro, M.; Escribano-Lopez, I.; Herance, J.R.; Rocha, M.; Vila, J.M.; Victor, V.M. Nanoparticles in Medicine: A Focus on Vascular Oxidative Stress. Oxidative Med. Cell. Longev. 2018, 2018, 6231482. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  18. Salata, O. Applications of nanoparticles in biology and medicine. J. Nanobiotechnol. 2004, 2, 3. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  19. Soares, S.; Sousa, J.; Pais, A.; Vitorino, C. Nanomedicine: Principles, Properties, and Regulatory Issues. Front. Chem. 2018, 6, 360. [Google Scholar] [CrossRef] [PubMed]
  20. Mitchell, M.J.; Billingsley, M.M.; Haley, R.M.; Wechsler, M.E.; Peppas, N.A.; Langer, R. Engineering precision nanoparticles for drug delivery. Nat. Rev. Drug Discov. 2021, 20, 101–124. [Google Scholar] [CrossRef]
  21. Rudramurthy, G.R.; Swamy, M.K. Potential applications of engineered nanoparticles in medicine and biology: An update. JBIC J. Biol. Inorg. Chem. 2018, 23, 1185–1204. [Google Scholar] [CrossRef]
  22. Talarska, P.; Boruczkowski, M.; Żurawski, J. Current Knowledge of Silver and Gold Nanoparticles in Laboratory Research—Application, Toxicity, Cellular Uptake. Nanomaterials 2021, 11, 2454. [Google Scholar] [CrossRef] [PubMed]
  23. Roe, D.; Karandikar, B.; Bonn-Savage, N.; Gibbins, B.; Roullet, J.-B. Antimicrobial surface functionalization of plastic catheters by silver nanoparticles. J. Antimicrob. Chemother. 2008, 61, 869–876. [Google Scholar] [CrossRef] [PubMed]
  24. Mansy, M.; Soliman, M.; Mubarak, R.; Shamel, M. The role of exogenous epidermal growth factor on Ki-67 proliferation marker expression in the submandibular salivary gland of albino rats receiving doxorubicin. F1000Research 2020, 9, 1393. [Google Scholar] [CrossRef] [PubMed]
  25. Barcińska, E.; Wierzbicka, J.; Zauszkiewicz-Pawlak, A.; Jacewicz, D.; Dabrowska, A.; Inkielewicz-Stepniak, I. Role of Oxidative and Nitro-Oxidative Damage in Silver Nanoparticles Cytotoxic Effect against Human Pancreatic Ductal Adenocarcinoma Cells. Oxidative Med. Cell. Longev. 2018, 2018, 8251961. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  26. Morais, M.; Teixeira, A.L.; Dias, F.; Machado, V.; Medeiros, R.; Prior, J.A.V. Cytotoxic Effect of Silver Nanoparticles Synthesized by Green Methods in Cancer. J. Med. Chem. 2020, 63, 14308–14335. [Google Scholar] [CrossRef]
  27. Arindam, B. Cytotoxic effect of green synthesized silver nanoparticles in MCF7 and MDA-MB-231 human breast cancer cells in vitro. Nucleus 2020, 63, 191–202. [Google Scholar] [CrossRef]
  28. Foldbjerg, R.; Dang, D.A.; Autrup, H. Cytotoxicity and genotoxicity of silver nanoparticles in the human lung cancer cell line, A549. Arch. Toxicol. 2010, 85, 743–750. [Google Scholar] [CrossRef] [PubMed]
  29. Shamel, M.; Riad, D.; Al Ankily, M. Histological and Ultrastructural Study of Silver Nanoparticles Toxicity and the Possible Protective Effect of Vitamin C on Submandibular Salivary Glands of Albino Rats. Int. J. Dent. Oral. Sci. 2021, 8, 2166–2171. [Google Scholar] [CrossRef]
  30. Singh, R.; Shedbalkar, U.U.; Wadhwani, S.A.; Chopade, B.A. Bacteriagenic silver nanoparticles: Synthesis, mechanism, and applications. Appl. Microbiol. Biotechnol. 2015, 99, 4579–4593. [Google Scholar] [CrossRef] [PubMed]
  31. Kurutas, E.B. The importance of antioxidants which play the role in cellular response against oxidative/nitrosative stress: Current state. Nutr. J. 2016, 15, 71. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  32. Miura, N.; Shinohara, Y. Cytotoxic effect and apoptosis induction by silver nanoparticles in HeLa cells. Biochem. Biophys. Res. Commun. 2009, 390, 733–737. [Google Scholar] [CrossRef]
  33. Veisi, S.; Johari, S.A.; Tyler, C.R.; Mansouri, B.; Esmaeilbeigi, M. Antioxidant properties of dietary supplements of free and nanoencapsulated silymarin and their ameliorative effects on silver nanoparticles induced oxidative stress in Nile tilapia (Oreochromis niloticus). Environ. Sci. Pollut. Res. 2021, 28, 26055–26063. [Google Scholar] [CrossRef]
  34. Faedmaleki, F.; Shirazi, F.H.; Ejtemaeimehr, S.; Anjarani, S.; Salarian, A.-A.; Ashtiani, H.A.; Rastegar, H. Study of Silymarin and Vitamin E Protective Effects on Silver Nanoparticle Toxicity on Mice Liver Primary Cell Culture. Acta Med. Iran. 2016, 54, 85–95. [Google Scholar] [PubMed]
  35. Hedayati, S.A.; Farsani, H.G.; Naserabad, S.S.; Hoseinifar, S.H.; Van Doan, H. Protective effect of dietary vitamin E on immunological and biochemical induction through silver nanoparticles (AgNPs) inclusion in diet and silver salt (AgNO3) exposure on Zebrafish (Danio rerio). Comp. Biochem. Physiol. Part C Toxicol. Pharmacol. 2019, 222, 100–107. [Google Scholar] [CrossRef]
  36. Yin, N.; Yao, X.; Zhou, Q.; Faiola, F.; Jiang, G. Vitamin E attenuates silver nanoparticle-induced effects on body weight and neurotoxicity in rats. Biochem. Biophys. Res. Commun. 2015, 458, 405–410. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  37. Giulia, C.; Simona, M.; Elena, M.; Daniela, C.; Lucia, M.; Ida, F.A.; Laura, M.; Gabriele, B.; Cesare, C. Oxidative and/or Inflammatory Thrust Induced by Silver Nanoparticles in Rabbits: Effect of Vitamin E or NSAID Administration on Semen Parameters. Mediat. Inflamm. 2020, 2020, 6664062. [Google Scholar] [CrossRef] [PubMed]
  38. Niki, E. Role of vitamin E as a lipid-soluble peroxyl radical scavenger: In vitro and in vivo evidence. Free. Radic. Biol. Med. 2014, 66, 3–12. [Google Scholar] [CrossRef]
  39. Liu, Z.; Ren, Z.; Zhang, J.; Chuang, C.-C.; Kandaswamy, E.; Zhou, T.; Zuo, L. Role of ROS and Nutritional Antioxidants in Human Diseases. Front. Physiol. 2018, 9, 477. [Google Scholar] [CrossRef] [Green Version]
  40. El Mahdy, M.M.; Eldin, T.A.S.; Aly, H.S.; Mohammed, F.F.; Shaalan, M. Evaluation of hepatotoxic and genotoxic potential of silver nanoparticles in albino rats. Exp. Toxicol. Pathol. 2015, 67, 21–29. [Google Scholar] [CrossRef]
  41. Bashandy, S.A. Beneficial Effect of Combined Administration of Vitamin C and Vitamin E in Amelioration of Chronic Lead Hepatotoxicity. Egypt. J. Hosp. Med. 2006, 23, 371–384. [Google Scholar] [CrossRef]
  42. Arokiyaraj, S.; Arasu, M.V.; Vincent, S.; Oh, Y.-K.; Kim, K.H.; Choi, K.-C.; Choi, S.H.; Prakash, N.U. Rapid green synthesis of silver nanoparticles from Chrysanthemum indicum L and its antibacterial and cytotoxic effects: An in vitro study. Int. J. Nanomed. 2014, 9, 379–388. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  43. Lee, B.; Lee, M.J.; Yun, S.J.; Kim, K.; Choi, I.-H.; Park, S. Silver nanoparticles induce reactive oxygen species-mediated cell cycle delay and synergistic cytotoxicity with 3-bromopyruvate in Candida albicans, but not in Saccharomyces cerevisiae. Int. J. Nanomed. 2019, 14, 4801–4816. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  44. Abdal Dayem, A.A.; Hossain, M.K.; Bin Lee, S.; Kim, K.; Saha, S.K.; Yang, G.-M.; Choi, H.Y.; Cho, S.-G. The Role of Reactive Oxygen Species (ROS) in the Biological Activities of Metallic Nanoparticles. Int. J. Mol. Sci. 2017, 18, 120. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  45. Fatemi, M.; Moshtaghian, J.; Ghaedi, K.; Jafari, N.; Naderi, G. Effects of silver nanoparticle on the developing liver of rat pups after maternal exposure. Iran J. Pharm. Res. 2017, 16, 685–693. [Google Scholar] [PubMed]
  46. Naguib, M.; Mahmoud, U.M.; Mekkawy, I.A.; Sayed, A.E.-D.H. Hepatotoxic effects of silver nanoparticles on Clarias gariepinus; Biochemical, histopathological, and histochemical studies. Toxicol. Rep. 2020, 7, 133–141. [Google Scholar] [CrossRef]
  47. Li, J.; Tang, M.; Xue, Y. Review of the effects of silver nanoparticle exposure on gut bacteria. J. Appl. Toxicol. 2019, 39, 27–37. [Google Scholar] [CrossRef] [Green Version]
  48. Ahmed, S.M.; Abdelrahman, S.A.; Shalaby, S.M. Evaluating the effect of silver nanoparticles on testes of adult albino rats (histological, immunohistochemical and biochemical study). J. Mol. Histol. 2017, 48, 9–27. [Google Scholar] [CrossRef]
  49. Zaki, N.T.; Ankily, A.; Mohamed, M.; Amin, R.M.; Halawa, A.M. The Possible Protective Role of Vitamin E on the Induced Silver Nanoparticles Toxicity on Filiform and Circumvallate Tongue Papillae of Albino Rats Histological and Immunohistochemical Study. J. Chem. Health Risks 2021, 11, 63–74. [Google Scholar]
  50. Taghyan, S.A.; Messiry, H.E.; Zainy, M.A.E. Evaluation of the toxic effect of silver nanoparticles and the possible protective effect of ascorbic acid on the parotid glands of albino rats: An in vivo study. Toxicol. Ind. Health 2020, 36, 446–453. [Google Scholar] [CrossRef]
  51. Asharani, P.V.; Low, K.M.G.; Hande, M.P.; Valiyaveettil, S. Cytotoxicity and Genotoxicity of Silver Nanoparticles in Human Cells. ACS Nano 2009, 3, 279–290. [Google Scholar] [CrossRef]
  52. Akter, M.; Sikder, M.T.; Rahman, M.M.; Ullah, A.A.; Hossain, K.F.B.; Banik, S.; Hosokawa, T.; Saito, T.; Kurasaki, M. A systematic review on silver nanoparticles-induced cytotoxicity: Physicochemical properties and perspectives. J. Adv. Res. 2018, 9, 1–16. [Google Scholar] [CrossRef] [PubMed]
  53. Ma, W.; Jing, L.; Valladares, A.; Mehta, S.L.; Wang, Z.; Li, P.A.; Bang, J.J. Silver Nanoparticle Exposure Induced Mitochondrial Stress, Caspase-3 Activation and Cell Death: Amelioration by Sodium Selenite. Int. J. Biol. Sci. 2015, 11, 860–867. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  54. Khan, A.A.; Alanazi, A.M.; Alsaif, N.; Al-Anazi, M.; Sayed, A.Y.; Bhat, M.A. Potential cytotoxicity of silver nanoparticles: Stimulation of autophagy and mitochondrial dysfunction in cardiac cells. Saudi J. Biol. Sci. 2021, 28, 2762–2771. [Google Scholar] [CrossRef] [PubMed]
  55. Redza-Dutordoir, M.; Averill-Bates, D.A. Activation of apoptosis signalling pathways by reactive oxygen species. Biochim. Biophys. Acta (BBA)-Mol. Cell Res. 2016, 1863, 2977–2992. [Google Scholar] [CrossRef]
  56. Ashraf, B.; Ghazy, D.; Shamel, M. Effects of aflatoxin B1 on the submandibular salivary gland of albino rats and possible therapeutic potential of Rosmarinus officinalis: A light and electron microscopic study. F1000Research 2020, 9, 752. [Google Scholar] [CrossRef]
  57. Handajani, J.; Hanindriyo, L. Expression of Cytokeratin 19 in the epithelial cell of Azo-exposed buccal mucosa. Med. J. Islam. Repub. Iran 2018, 32, 132–135. [Google Scholar] [CrossRef] [Green Version]
  58. Al-Ankily, M.M.; Shamel, M.; Bakr, M. Epidermal growth factor restores cytokeratin expression in rats with diabetes. J. Res. Med. Dent. Sci. 2018, 6, 196–203. [Google Scholar]
  59. Bakr, M.M.; Al-Ankily, M.M.; Shamel, M. Cytokeratin overexpression in Submandibular Salivary Glands of Rats Treated with Botulinum Toxin and Epidermal Growth Factor. Int. J. Dent. Oral. Sci. 2021, 8, 3491–3496. [Google Scholar]
  60. Rizvi, S.; Raza, S.T.; Ahmed, F.; Ahmad, A.; Abbas, S.; Mahdi, F. The Role of Vitamin E in Human Health and Some Diseases. Sultan Qaboos Univ. Med. J. 2014, 14, e157–e165. [Google Scholar] [PubMed]
  61. Wang, X.; Quinn, P.J. Vitamin E and its function in membranes. Prog. Lipid Res. 1999, 38, 309–336. [Google Scholar] [CrossRef]
  62. Howard, A.C.; McNeil, A.K.; McNeil, P.L. Promotion of plasma membrane repair by vitamin E. Nat. Commun. 2011, 2, 597. [Google Scholar] [CrossRef] [Green Version]
  63. Lytvynenko, A.P.; Rieznichenko, L.S.; Sribna, V.A.; Stupchuk, M.I.; Grushka, N.G.; Shepel, A.A.; Voznesenska, T.Y.; Blashkiv, T.V.; Kaleynykova, O.N. Functional status of reproductive system under treatment of silver nanoparticles in female mice. Int. J. Reprod. Contracept. Obstet. Gynecol. 2017, 6, 1713. [Google Scholar] [CrossRef] [Green Version]
  64. Khodashenas, B.; Ghorbani, H.R. Synthesis of silver nanoparticles with different shapes. Arab. J. Chem. 2019, 12, 1823–1838. [Google Scholar] [CrossRef] [Green Version]
  65. Kim, D.H.; Park, J.C.; Jeon, G.E.; Kim, C.S.; Seo, J.H. Effect of the size and shape of silver nanoparticles on bacterial growth and metabolism by monitoring optical density and fluorescence intensity. Biotechnol. Bioprocess Eng. 2017, 22, 210–217. [Google Scholar] [CrossRef]
  66. Riaz, M.; Mutreja, V.; Sareen, S.; Ahmad, B.; Faheem, M.; Zahid, N.; Jabbour, G.; Park, J. Exceptional antibacterial and cytotoxic potency of monodisperse greener AgNPs prepared under optimized pH and temperature. Sci. Rep. 2021, 11, 2866. [Google Scholar] [CrossRef] [PubMed]
  67. Bergin, I.L.; Wilding, L.A.; Morishita, M.; Walacavage, K.; Ault, A.; Axson, J.L.; Stark, D.I.; Hashway, S.A.; Capracotta, S.S.; Leroueil, P.R.; et al. Effects of particle size and coating on toxicologic parameters, fecal elimination kinetics and tissue distribution of acutely ingested silver nanoparticles in a mouse model. Nanotoxicology 2016, 10, 352–360. [Google Scholar] [CrossRef] [Green Version]
  68. Hoang, V.-T.; Mai, M.; Thi Tam, L.; Vu, N.P.; Tien Khi, N.; Dinh Tam, P.; Quang Huy, T.; Le, A.-T.; Xuan Dinh, N.; Tran, V.-H. Functionalized-AgNPs for Long-Term Stability and Its Applicability in the Detection of Manganese Ions. Adv. Polym. Technol. 2020, 2020, 9437108. [Google Scholar] [CrossRef]
  69. Borowik, A.; Butowska, K.; Konkel, K.; Banasiuk, R.; Derewonko, N.; Wyrzykowski, D.; Davydenko, M.; Cherepanov, V.; Styopkin, V.; Prylutskyy, Y.; et al. The Impact of Surface Functionalization on the Biophysical Properties of Silver Nanoparticles. Nanomaterials 2019, 9, 973. [Google Scholar] [CrossRef] [PubMed] [Green Version]
  70. Bilek, O.; Fialova, T.; Otahal, A.; Adam, V.; Smerkova, K.; Fohlerova, Z. Antibacterial activity of AgNPs–TiO2 nanotubes: Influence of different nanoparticle stabilizers. RSC Adv. 2020, 10, 44601–44610. [Google Scholar] [CrossRef]
  71. Buszewski, B.; Rafiſska, K.; Pomastowski, P.; Walczak, J.; Rogowska, A. Novel aspects of silver nanoparticles functionalization. Colloids Surfaces A Physicochem. Eng. Asp. 2016, 506, 170–178. [Google Scholar] [CrossRef]
  72. Ahamed, M.; Karns, M.; Goodson, M.; Rowe, J.; Hussain, S.M.; Schlager, J.J.; Hong, Y. DNA damage response to different surface chemistry of silver nanoparticles in mammalian cells. Toxicol. Appl. Pharmacol. 2008, 233, 404–410. [Google Scholar] [CrossRef]
  73. Kennedy, D.C.; Orts-Gil, G.; Lai, C.-H.; Müller, L.; Haase, A.; Luch, A.; Seeberger, P.H. Carbohydrate functionalization of silver nanoparticles modulates cytotoxicity and cellular uptake. J. Nanobiotechnol. 2014, 12, 59. [Google Scholar] [CrossRef] [PubMed]
  74. Serra, A.; Filippo, E.; Re, M.; Palmisano, M.; Vittori-Antisari, M.; Buccolieri, A.; Manno, D. Non-functionalized silver nanoparticles for a localized surface plasmon resonance-based glucose sensor. Nanotechnology 2009, 20, 165501. [Google Scholar] [CrossRef]
  75. Pal, K.; Sarkar, P.; Anis, A.; Wiszumirska, K.; Jarzębski, M. Polysaccharide-Based Nanocomposites for Food Packaging Applications. Materials 2021, 14, 5549. [Google Scholar] [CrossRef] [PubMed]
  76. Murei, A.; Ayinde, W.B.; Gitari, M.W.; Samie, A. Functionalization and antimicrobial evaluation of ampicillin, penicillin and vancomycin with Pyrenacantha grandiflora Baill and silver nanoparticles. Sci. Rep. 2020, 10, 11596. [Google Scholar] [CrossRef] [PubMed]
  77. Rogowska, A.; Rafińska, K.; Pomastowski, P.; Walczak, J.; Railean-Plugaru, V.; Buszewska-Forajta, M.; Buszewski, B. Silver nanoparticles functionalized with ampicillin. Electrophoresis 2017, 38, 2757–2764. [Google Scholar] [CrossRef] [PubMed]
  78. Hajtuch, J.; Hante, N.; Tomczyk, E.; Wojcik, M.; Radomski, M.W.; Santos-Martinez, M.J.; Inkielewicz-Stepniak, I. Effects of functionalized silver nanoparticles on aggregation of human blood platelets. Int. J. Nanomed. 2019, 14, 7399–7417. [Google Scholar] [CrossRef] [Green Version]
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Figure 1. (A,B) Hematoxylin and eosin (H&E) staining in submandibular salivary glands of the control group displaying normal structures. Serous acini (S), granular convoluted tubule (GCT), striated duct (ST), and excretory duct (EX) surrounded by fibrous connective tissue stroma (blue arrows). (C,D) Hematoxylin and eosin (H&E) staining in the AgNPs group showing degenerated acini (red arrows), atrophic serous acini (S) with cytoplasmic vacuolation (black arrows), and wide interacinar spaces (yellow arrows). Vacuolated GCT and striated duct (ST) and excretory duct (EX) with thickened lining epithelium presenting extensive vacuolations (red arrows). Degeneration in the surrounding connective tissue (blue arrows). (E,F): Hematoxylin and eosin (H&E) staining in the vitamin E-treated group presenting typical serous acini (S), GCT with few cytoplasmic vacuoles (yellow arrows), and striated ducts with normal cell lining (ST). Dilated and congested blood vessels were observed (B) and the excretory duct (EX) shows relatively normal lining with slight vacuolations in some areas (black arrow) (original magnification ×400).
Figure 1. (A,B) Hematoxylin and eosin (H&E) staining in submandibular salivary glands of the control group displaying normal structures. Serous acini (S), granular convoluted tubule (GCT), striated duct (ST), and excretory duct (EX) surrounded by fibrous connective tissue stroma (blue arrows). (C,D) Hematoxylin and eosin (H&E) staining in the AgNPs group showing degenerated acini (red arrows), atrophic serous acini (S) with cytoplasmic vacuolation (black arrows), and wide interacinar spaces (yellow arrows). Vacuolated GCT and striated duct (ST) and excretory duct (EX) with thickened lining epithelium presenting extensive vacuolations (red arrows). Degeneration in the surrounding connective tissue (blue arrows). (E,F): Hematoxylin and eosin (H&E) staining in the vitamin E-treated group presenting typical serous acini (S), GCT with few cytoplasmic vacuoles (yellow arrows), and striated ducts with normal cell lining (ST). Dilated and congested blood vessels were observed (B) and the excretory duct (EX) shows relatively normal lining with slight vacuolations in some areas (black arrow) (original magnification ×400).
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Figure 2. (A,B) Submandibular salivary gland from the control group showing a positive cytokeratin staining reaction of the entire gland components. (C,D) Submandibular salivary gland from the AgNPs group incubated with anti-cytokeratin monoclonal antibody showing a weak to moderate positive cytokeratin reaction in both the serous acinar cells and ductal cells. (E,F) Submandibular salivary gland from the rats after treatment with vitamin E and incubation with anti-cytokeratin monoclonal antibody displaying a moderate positive cytokeratin reaction of serous acinar cells, and a moderate to strong positive cytokeratin reaction in the ductal cells (original magnification ×400).
Figure 2. (A,B) Submandibular salivary gland from the control group showing a positive cytokeratin staining reaction of the entire gland components. (C,D) Submandibular salivary gland from the AgNPs group incubated with anti-cytokeratin monoclonal antibody showing a weak to moderate positive cytokeratin reaction in both the serous acinar cells and ductal cells. (E,F) Submandibular salivary gland from the rats after treatment with vitamin E and incubation with anti-cytokeratin monoclonal antibody displaying a moderate positive cytokeratin reaction of serous acinar cells, and a moderate to strong positive cytokeratin reaction in the ductal cells (original magnification ×400).
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Scheme 1. Mean area percent of cytokeratin immuno-expression of all groups.
Scheme 1. Mean area percent of cytokeratin immuno-expression of all groups.
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Figure 3. An electron micrograph of the submandibular gland from a control group showing: (A): Serous acinus with pyramidal-shaped cells and normal nucleus (Nu) and secretory granules (S), (B): Serous acini with normal cell to cell junction (arrows), normal mitochondria (M), and rough endoplasmic reticulum (R), (C): granular convoluted tubule with normal nucleus (N) and secretory electron-dense granules (G), (D): Striated duct with numerous radially arranged mitochondria (M).
Figure 3. An electron micrograph of the submandibular gland from a control group showing: (A): Serous acinus with pyramidal-shaped cells and normal nucleus (Nu) and secretory granules (S), (B): Serous acini with normal cell to cell junction (arrows), normal mitochondria (M), and rough endoplasmic reticulum (R), (C): granular convoluted tubule with normal nucleus (N) and secretory electron-dense granules (G), (D): Striated duct with numerous radially arranged mitochondria (M).
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Figure 4. An electron micrograph of the submandibular gland from AgNPs showing: (A): acinar cells with irregular basally located nuclei (N), accumulation of electron-lucent secretory granules (S). Large and small cytoplasmic vacuolization was observed in the acinar cells (V), (B): Numerous vacuolization (arrows) in acinus and ducts, (C): granular convoluted tubule with a marked decrease in the size and number of their granular contents, pleomorphism of the granules, and great variation in their electron density. Cytoplasmic vacuolization of the duct cells (V), (D): Striated duct with degenerated mitochondria (M), vacuolization (arrows), and loss of basal folding.
Figure 4. An electron micrograph of the submandibular gland from AgNPs showing: (A): acinar cells with irregular basally located nuclei (N), accumulation of electron-lucent secretory granules (S). Large and small cytoplasmic vacuolization was observed in the acinar cells (V), (B): Numerous vacuolization (arrows) in acinus and ducts, (C): granular convoluted tubule with a marked decrease in the size and number of their granular contents, pleomorphism of the granules, and great variation in their electron density. Cytoplasmic vacuolization of the duct cells (V), (D): Striated duct with degenerated mitochondria (M), vacuolization (arrows), and loss of basal folding.
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Figure 5. An electron micrograph of the submandibular gland from the vitamin E group showing (A): an almost normal acinus structure with basally located nucleus (N), and myoepithelial cell (M), few vacuolization (arrows) can be observed, (B): striated duct with almost normal basal striations, moderate number of elongated radially arranged mitochondria (M), and electron dense secretory vesicles (S); (C): granular convoluted tubules lined with columnar cells with a lot of electron-dense granules (G). (D): Striated duct with numerous radially arranged mitochondria (M).
Figure 5. An electron micrograph of the submandibular gland from the vitamin E group showing (A): an almost normal acinus structure with basally located nucleus (N), and myoepithelial cell (M), few vacuolization (arrows) can be observed, (B): striated duct with almost normal basal striations, moderate number of elongated radially arranged mitochondria (M), and electron dense secretory vesicles (S); (C): granular convoluted tubules lined with columnar cells with a lot of electron-dense granules (G). (D): Striated duct with numerous radially arranged mitochondria (M).
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Table
Table 1. Area percentage of cytokeratin immuno-reactivity in different groups.
Table 1. Area percentage of cytokeratin immuno-reactivity in different groups.
ControlAgNPsAgNPs + Vit Ep-Value
Minimum19.487.9518.420.001
Median24.7611.4822.55
Maximum25.8714.1123.67
Mean24.0311.4122.1
Standard Deviation2.021.701.54
Standard Error0.740.60.916
Table
Table 2. Tukey’s Post Hoc Test for cytokeratin immuno-reactivity in different groups.
Table 2. Tukey’s Post Hoc Test for cytokeratin immuno-reactivity in different groups.
Tukey’s Multiple ComparisonSignificance (p > 0.05)Summary
Control vs. AgNPs0.001Significant
Control vs. AgNPs + Vit E0.055Not significant
AgNPs vs. AgNPs + Vit E0.001Significant
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Bakr, M.M.; Al-Ankily, M.M.; Shogaa, S.M.; Shamel, M. Attenuating Effect of Vitamin E against Silver Nano Particles Toxicity in Submandibular Salivary Glands. Bioengineering 2021, 8, 219. https://doi.org/10.3390/bioengineering8120219

AMA Style

Bakr MM, Al-Ankily MM, Shogaa SM, Shamel M. Attenuating Effect of Vitamin E against Silver Nano Particles Toxicity in Submandibular Salivary Glands. Bioengineering. 2021; 8(12):219. https://doi.org/10.3390/bioengineering8120219

Chicago/Turabian Style

Bakr, Mahmoud M., Mahmoud M. Al-Ankily, Sara M. Shogaa, and Mohamed Shamel. 2021. "Attenuating Effect of Vitamin E against Silver Nano Particles Toxicity in Submandibular Salivary Glands" Bioengineering 8, no. 12: 219. https://doi.org/10.3390/bioengineering8120219

APA Style

Bakr, M. M., Al-Ankily, M. M., Shogaa, S. M., & Shamel, M. (2021). Attenuating Effect of Vitamin E against Silver Nano Particles Toxicity in Submandibular Salivary Glands. Bioengineering, 8(12), 219. https://doi.org/10.3390/bioengineering8120219

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