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Article

Diosmin Mitigates Gentamicin-Induced Nephrotoxicity in Rats: Insights on miR-21 and -155 Expression, Nrf2/HO-1 and p38-MAPK/NF-κB Pathways

by
Rania I. Nadeem
1,*,
Amany S. Aboutaleb
2,
Nancy S. Younis
3 and
Hebatalla I. Ahmed
2
1
Pharmacology and Toxicology Department, Faculty of Pharmacy, Heliopolis University, Cairo 11785, Egypt
2
Pharmacology and Toxicology Department, Faculty of Pharmacy (Girls), Al-Azhar University, Cairo 11754, Egypt
3
Pharmaceutical Sciences Department, Faculty of Clinical Pharmacy, King Faisal University, Al-Ahsa, Al-Hofuf 31982, Saudi Arabia
*
Author to whom correspondence should be addressed.
Toxics 2023, 11(1), 48; https://doi.org/10.3390/toxics11010048
Submission received: 4 December 2022 / Revised: 26 December 2022 / Accepted: 29 December 2022 / Published: 1 January 2023
(This article belongs to the Section Drugs Toxicity)
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Abstract

:
Gentamicin (GNT) is the most frequently used aminoglycoside. However, its therapeutic efficacy is limited due to nephrotoxicity. Thus, the potential anticipatory effect of Diosmin (DIOS) against GNT-prompted kidney damage in rats together with the putative nephroprotective pathways were scrutinized. Four groups of rats were used: (1) control; (2) GNT only; (3) GNT plus DIOS; and (4) DIOS only. Nephrotoxicity was elucidated, and the microRNA-21 (miR-21) and microRNA-155 (miR-155) expression and Nrf2/HO-1 and p38-MAPK/NF-κB pathways were assessed. GNT provoked an upsurge in the relative kidney weight and serum level of urea, creatinine, and KIM-1. The MDA level was markedly boosted, with a decline in the level of TAC, SOD, HO-1, and Nrf2 expression in the renal tissue. Additionally, GNT exhibited a notable amplification in TNF-α, IL-1β, NF-κB p65, and p38-MAPK kidney levels. Moreover, caspase-3 and BAX expression were elevated, whereas the Bcl-2 level was reduced. Furthermore, GNT resulted in the down-regulation of miR-21 expression along with an up-regulation of the miR-155 expression. Histological examination revealed inflammation, degradation, and necrosis. GNT-provoked pathological abnormalities were reversed by DIOS treatment, which restored normal kidney architecture. Hence, regulating miR-21 and -155 expression and modulating Nrf2/HO-1 and p38-MAPK/NF-κB pathways could take a vital part in mediating the reno-protective effect of DIOS.

Graphical Abstract

1. Introduction

Aminoglycosides are a class of potent, broad-spectrum antibiotics employed to defend against infections triggered by gram-negative microorganisms. Due to its low cost and consistent potency, gentamicin (GNT) is the most often utilized aminoglycoside [1]. However, its therapeutic efficacy is limited due to the induction of nephrotoxicity [2]. Severe proximal renal tubular necrosis as well as elevated serum creatinine and urea levels are hall markers of GNT nephrotoxicity [3]. Additionally, Kidney Injury Molecule-1 (KIM-1), a tubular protein, is documented as a highly delicate and specific biomarker to detect the early stages of GNT nephrotoxicity [4].
The precise mechanism by which GNT induces renal damage remains to be fully elucidated. GNT selectively accumulates in the renal proximal tubular cells, causing glomerular deterioration, cellular necrosis, and fibrosis, as well as inflammation. It has been stated that the engendering of reactive oxygen species (ROS), inflammation and apoptosis take part in the pathogenesis of GNT-induced kidney toxicity [5,6,7].
Remarkably, the antioxidant defense mechanism’s chief regulator, nuclear factor erythroid 2-related factor 2 (Nrf2), maintains the production of antioxidant genes such as heme oxygenase-1 (HO-1) and halts oxidative damage in cells [8]. Targeting the Nrf2/HO-1 pathway is proposed as a potential protective pathway against GNT-prompted nephrotoxicity by a significant body of research [9,10,11].
Furthermore, GNT-nephrotoxicity has been linked to renal tissue up-regulation of p38-mitogen-activated protein kinase (p38-MAPK) and nuclear factor kappa B (NFB); both of which are imperative in the inflammatory and apoptotic pathways [12,13,14,15].
microRNAs (miRNAs), small non-coding RNA molecules, are engaged in plentiful physiological and pathological processes by regulating gene expression [16,17,18]. They are readily detected in body fluids and are now being explored as clinical diagnostics and therapeutic targets [19,20]. In the kidneys, miRNAs have been associated with normal physiology and development as well as the pathogenesis of several renal diseases, such as renal carcinoma, diabetic nephropathy, acute kidney injury and others [21]. In fact, many studies have demonstrated the association between kidney disease and miRNAs in humans and experimental animals [22,23,24,25,26].
Diosmin (3′,5,7-trihydroxy-4′-methoxyflavone 7-rhamnoglucoside) (DIOS), a citrus fruit unsaturated flavonoid glycoside, is a semi-synthetic drug used to treat venous diseases, such as chronic venous insufficiency and varicose veins [27]. DIOS is acknowledged to possess several pharmacological effects, comprising anti-inflammatory, antioxidant, and anti-apoptotic activities [28,29,30]. Furthermore, DIOS has anti-diabetic [31], anti-cancer [32], liver-protective [29], neuroprotective [33], and reno-protective properties [34,35]. Indeed, DIOS has been proven to defend the kidneys in various models of renal damage via anti-oxidant, anti-inflammatory and anti-apoptotic pathways [28,36,37,38]. Interestingly, a recent study conducted by Ali et al. [39] demonstrated the nephroprotective effect of DIOS against gentamicin-induced nephrotoxicity via the suppression of oxidative stress. However, the anti-inflammatory and antiapoptotic effects of DIOS as well as its impact on miRNAs against GNT nephrotoxicity have not yet been explored.
Towards recapitulation, our work pursues to divulge the possible protective outcome of DIOS versus GNT-prompted nephrotoxicity in rats and to unveil the putative mechanisms underlying this effect.

2. Materials and Methods

2.1. Drugs and Chemicals

Gentamicin (GNT), DIOS, and all utilized chemicals were brought from Sigma-Aldrich, St. Louis, MO, USA. DIOS was suspended in the oral vehicle, 0.5% carboxymethyl cellulose (CMC), while saline was the vehicle for dissolving GNT. All used chemicals were of top quality and analytical grade.

2.2. Animals

Thirty-two adult male Sprague-Dawley rats were procured from the Nile Co. for Pharmaceuticals and Chemical Industries, Cairo, Egypt. At the beginning of the experiment, the rats weighed approximately 150–300 g. Animals were arbitrarily alienated into four groups (four rats/stainless-steel cage) in the animal house of the Faculty of Pharmacy (Girls), Al-Azhar University facilitated with suitable controlled temperature (25 ± 2 °C), and humidity. A 12 h artificial light/dark cycle was applied, and the rats had unrestricted access to water and commercial standard chow pellets. All experiments in this study were accomplished in agreement with the ethical procedures and policies approved by the Ethics Committee of the Faculty of Pharmacy, (Girls), Al-Azhar University (Approval number: 318) and encountered with the terms of the US National Institutes of Health guide for the care and use of laboratory animals (NIH Publications No. 85-23, revised 2011).

2.3. Experiment Design

After acclimatization for a week, rats were erratically allotted into four equal groups, including eight rats; groups and treatments were given as follows:
Control group: rats received 0.5% CMC (1 mL/animal P.O.) for 14 days and saline (1 mL/animal, I.P.) from the 8th to the 14th day.
GNT group: rats received 0.5% CMC (1 mL/animal, P.O.) for 14 days and GNT (100 mg/kg, I.P.) was administered from the 8th to the 14th day [15].
GNT + DIOS group: rats received DIOS (100 mg/kg P.O) for 14 days [40] and GNT was administered one hour after DIOS oral administration commencing from the 8th to the 14th day.
DIOS group: rats were given DIOS (100 mg/kg, P.O.) for 14 days and a concomitant dose of saline (1 mL/animal I.P.) commencing from the 8th to the 14th day.
The weight of the rats was measured twenty-four hours following the last injection, and blood samples were taken while being anesthetized with pentobarbital (50 mg/kg) [41] through the retro-orbital plexus. Serum was isolated and used for biochemical assessment of kidney function biomarkers. Rats were then euthanized, and the kidneys were promptly removed, weighted, and rinsed in ice-cold normal saline (0.9% w/v). The kidneys were split into two identical pieces: one half was stored at −80 °C for further biochemical investigation. The other half was fixed in 10% buffered formalin for histopathological investigations. For biochemical investigation, the tissues were homogenized, with an ultimate concentration of 10% w/v, in ice-cold 0.1 M phosphate buffer (pH 7.4).

2.4. Methods

2.4.1. Estimation of Relative Kidney Weight

The relative kidney weight was estimated following the below equation [42]:
The kidney weight divided by body weight (g/g) × 100 yields the relative kidney weight.

2.4.2. Measurement of Total Protein

The quantitative protein analysis was done with the Bradford Protein Assay Kit (BIO BASIC INC. Markham, ON, L3R 8T4, Canada). The assay was performed according to the manufacturer’s guidelines.

2.4.3. Biochemical Investigation

The assessment of renal function in serum and oxidative stress markers in the kidney was done by quantitative colorimetric assay with an ultraviolet (UV)—visible spectrophotometer (Shimadzu UV-1601, 84, Tokyo, Japan), and the commercially available test kits were supplied by (Biodiagnostic, Giza, Egypt), according to the manufacturer’s guidelines. BUN was measured by its action with a chromogenic reagent that forms a colored complex [43], while SCr was assessed using a picrate which forms a red-colored complex with creatinine [44]. Lipid peroxidation was measured as MDA by its reaction with thiobarbituric acid [45]. SOD enzyme activity was estimated by its ability to inhibit the phenazine methosulphate-mediated reduction of nitro blue tetrazolium dye [46]. TAC was assessed according to Koracevic et al. [47].

2.4.4. Enzyme-Linked Immunosorbent Assay (ELISA)

ELISA kits from MyBioSource, San Diego, CA, USA (catalog no. MBS355395) were used to define KIM-1 in the serum and tissue levels of HO-1, p38-MAPK, and IL-1β (catalogs no. MBS764989, MBS765087 and MBS825017 respectively) following the manufacturer’s directions. Furthermore, the tissue levels of TNF-α, BAX, and BCL2 were assessed using Rat ELISA Kit [Cusabio Biotech, Chins; CSB-E11987r, CSB-EL002573RA and CSB-E08854r, respectively] according to manufacturer’s instructions.

2.4.5. Western Blotting

Lysis of the renal tissues’ homogenate was achieved with an ice-cold lysis buffer (10% glycerol, 2% SDS in 62 mM Tris-HCl, pH 6.8), which contains a protease inhibitor cocktail (Sigma-Aldrich, St. Louis, MO, USA). Protein content in the composed protein lysates was done using bovine serum albumin as a standard according to the Bradford method [48]. Under denaturing conditions, an equal amount of total protein (7.5 μg) was undertaken by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), transmitted onto nitrocellulose membranes, and then blocked with 6% non-fat dry milk in TBS-Tween buffer for 3 h at 4 °C. The nitrocellulose membranes were incubated with the specific primary antibody against the detected protein [anti-NF-κB p65 (1:1000; Cell Signaling Technology, Danvers, MA, USA; Cat. No. 3034), anti-Nrf2 (1:500; Abcam (Cambridge, UK); Cat. No. ab137550), anti-Caspase-3 (1:1000; Cell Signaling Technology (USA); Cat. No. 9662)], at 4 °C overnight. A β-actin antibody, the housekeeping gene, was added the following day and incubated at 4 °C for 1 h on a roller shaker. Finally, the membranes were washed five times for 5 min each in Tris-buffered saline-tween 20 (TBST) and incubated with Horseradish Peroxidase (HRP)-conjugated secondary antibody (1:2000; Novus Biologicals, Centennial, CO, USA; Cat. No. NBP1-75297) for 1 h at room temperature. Furthermore, rinsing of the membranes with TBST buffer was done, scanning of the bands with the ChemiDoc scanner was performed, and the densitometric intensity of each band was quantified after normalization with the housekeeping gene expression.

2.4.6. Quantitative Real-Time RT-PCR

Estimation of the expression level of miR-21 and -155 was done by Quantitative real-time RT-PCR. miRNAs were extracted from tissue samples using a mirvana kit (Thermo Scientific, Waltham, MA, USA). Nanodrop® spectrophotometer was used to measure the absorbance of the isolated miRNAs at 260 nm. Amplification and quantification of mature miRNAs were performed using Reverse Transcription–Polymerase Chain Reaction (RT-PCR) with TaqMan® MicroRNA Assays, which planned to detect and accurately calculate mature microRNAs (micRNAs) using Applied Biosystems real-time PCR instruments. Throughout the target amplification step, the AmpliTaq® Gold DNA polymerase amplifies target cDNA synthesized from the miRNA sample, using sequence-specific primers. The results were analyzed by relative quantification (Rq); it describes the change in the expression of the target gene relative to the reference group using the 2−∆∆ct Method.

2.4.7. Histopathological Examinations

The kidneys from rats of different groups were assembled for histopathological examinations. These tissue samples were embedded in 10% neutral buffered formalin for 24 h. Afterwards, the samples were flushed with tap water. Afterwards, they were dehydrated, fixed in paraffin wax, and cut into 5 mm sections. Finally, they were stained with hematoxylin and eosin according to Gamble [49]. The tissues were scrutinized under a light microscope.

2.5. Statistical Analysis

Differences between groups were estimated using a one-way analysis of variance (ANOVA) and Tukey’s test was done for multiple comparisons. The probability of <0.05 was employed as the criterion for significance. The data were demonstrated as mean ± standard deviation (SD). The GraphPad Prism (ISI®, San Diego, CA, USA) software (version 9) was utilized to carry out all statistical analysis and graph illustrations.

3. Results

3.1. Measurement of Relative Kidney Weight

In the current study, the administration of GNT significantly boosted the relative kidney weight by 30.34% with respect to the control group. Nevertheless, the administration of DIOS significantly diminished it by 15.5% of the GNT-treated rats’ values (Table 1).

3.2. Estimation of Renal Function Markers

Table 2 showed that GNT markedly elevated the BUN, SCr, and KIM-1 serum levels to 369.66, 806, and 308.44%, respectively, in comparison with the control group. DIOS pretreatment significantly lessened their values by 48.9, 70.6, and 50.5%, respectively, with respect to GNT-treated rats.

3.3. Determination of Renal Oxidative Stress Markers

It was revealed by Table 3 that GNT significantly (p < 0.05) instigated a 4.27-fold increase in the renal MDA level with a 0.39- and 0.36-fold drop in the renal TAC and SOD levels, respectively, from the control animals’ values. In contrast, DIOS pretreatment instigated a 0.45-fold drop in renal MDA levels with a 1.64- and 2.16-fold rise in the renal TAC and SOD levels, respectively, with respect to GNT-treated rats.

3.4. Assessment of Nrf2 and HO-1 Expression in the Kidney

By spotting Figure 1, GNT administration resulted in a substantial diminution in Nrf2 and HO-1 expression by 0.184- and 0.187-fold, respectively, with respect to the control group. However, DIOS pretreatment developed a significant increase by 3.36- and 3.745-fold in the Nrf2 and HO-1 expression, respectively, as compared with the GNT-treated rats.

3.5. Evaluation of Inflammatory Markers, p38-MAPK and NF-κB p65 Levels

Figure 2 revealed that GNT resulted in a pointedly rise in the level of IL-1β and TNF-α, as well as the partaker proteins; p38-MAPK and NF-κB p65 to 401.6, 328.4, 503.3 and 573.5% respectively, in comparison with the control rats. Instead, DIOS administration noticeably diminished their values to 38.4, 52.8, 43.9 and 41.145% respectively as compared with the GNT-treated rats.

3.6. Estimation of Apoptotic Markers

As shown in Figure 3, administration of GNT induced a considerable upsurge in the renal tissue level of BAX and Caspase-3 by 282.2 and 457.23%, respectively, and a marked-down surge in Bcl-2 level by 52.84% with respect to the control group. However, DIOS pretreatment markedly dropped the BAX and Caspase-3 levels by 63.7 and 74.75%, respectively, and markedly raised the Bcl2 level by 94.2% with respect to the GNT-treated group.
Undeniably, the BAX/Bcl-2 ratio is a crucial marker for the susceptibility of the cells to apoptosis. The current study unveiled a noteworthy rise in BAX/Bcl-2 ratio in GN-treated rats by 710.23% with respect to the control values. Nevertheless, when compared with GNT-treated rats, this ratio was markedly dropped via DIOS treatment by 81.29%.

3.7. Effect of Diosmin on microRNAs Expression

From the data elucidated in Figure 4, GNT significantly induced a 0.46-fold decrease in miR-21 and a 5.62-fold upsurge in miR-155 expression from the control rats’ values. Pretreatment with DIOS significantly caused a 2.14-fold rise in miR-21 and a 0.37-fold drop in miR-155 expression with respect to the GNT-treated rats.

3.8. Effect of Diosmin Supplementation on Kidney Histology

Histopathological investigation of kidney sections from all treated groups was elucidated in Figure 5. Normal histological structure for glomeruli surrounded by numerous renal tubules was shown in the control and the DIOS-treated groups (Figure 5A,F). GNT treatment resulted in coagulative necrosis in a diffused manner all over the lining tubular epithelium at the cortex (Figure 5B) associated with inflammatory cells infiltration in between the degenerated tubules (Figure 5C) as well as cystic dilatation and degeneration in the tubules at the corticomedullary portion (Figure 5D). Pretreatment with DIOS (GNT + DIOS group) resulted in focal few inflammatory cells infiltration amongst the tubules at the cortex (Figure 5E). The semiquantitative histological score of the kidney sections is shown in Table 4.

4. Discussion

The kidneys are considered the prime target for chemical-induced toxicity due to their role in the excretion of toxicants and their metabolites [11]. Many therapeutic agents have been reported to induce nephrotoxicity in clinical use [50]. GNT, a commonly used aminoglycoside antibiotic, is one of the leading causes of drug-induced nephrotoxicity [51]. In this context, the current work was held to scrutinize the possible nephron-protective effect of DIOS in GNT-induced kidney injury. In the present investigation, rats administered with GNT displayed noticeable nephrotoxicity, revealed via the rise in the relative kidney weight, level of serum urea, creatinine, and KIM-1. Additionally, severe renal histological alterations demonstrated by coagulative necrosis of tubular epithelium, degenerated tubules, and inflammation were elucidated. These results reflect the nephrotoxic impact of gentamicin on the kidneys. Previous reports have shown similar results [4,15,52,53]. On the other hand, DIOS exhibited significant enhancement in renal functions reinforced by the ameliorations seen in the histological examination. Similar findings were observed in studies done by Rehman et al. [28] and El-Fawal et al. [34].
Several studies confirmed that GNT elevated the oxidative stress biomarkers and reduced the antioxidant biomarkers, supporting the hypothesis that oxidative stress contributes to GNT-induced renal toxicity [15,54,55]. Furthermore, HO-1 is an essential partaker protein of the body’s defense against oxidation. Nrf2 suppresses the oxidative injury response by regulating the antioxidant partaker’s protein expression, including the HO-1 gene [56]. Former studies found that Nrf2/HO-1 expression was down-regulated following GNT injection [9,10]. The current research unveiled that GNT caused drastic disruption of the renal oxidant/antioxidant status evidenced by a marked elevation in MDA level and reduction in both TAC and SOD levels as well as Nrf2 and HO-1 expression. Interestingly, co-treatment of GNT with DIOS restored the oxidant/antioxidant balance by decreasing the MDA level and increasing the TAC and SOD levels, along with Nrf2 and HO-1 expression. These outcomes are in line with earlier studies reporting the potent antioxidant effect of DIOS against different animal models [29,30,39]. Thus, these findings show that DIOS protected against GNT-induced renal oxidative injury by triggering the expression of Nrf2/HO-1.
Results of the present work revealed that GNT-treated rats exhibited a significant elevation in the renal level of TNF-α and IL-1β, reflecting inflammatory progression. This finding is in good agreement with Cao et al. [57]. The DIOS anti-inflammatory effect was shown by ameliorating the increase in both TNF-α and IL-1β levels, which is in parallel with former studies [37,38].
Apoptosis plays a key role in numerous renal diseases and drug-induced nephrotoxicity [58]. In the current investigation, GNT caused a dramatic up-regulation in both caspase-3 and the pro-apoptotic BAX expression along with notable down-regulation in the anti-apoptotic Bcl-2 expression, suggesting that GNT-induced renal injury is associated with apoptotic pathway activation. Similar results were also detected in previous studies done by El Gamal et al. [59] and Sahu et al. [60]. On the other hand, DIOS provided reno-protection by attenuating the caspase-3 and BAX overexpression together with enhancing Bcl-2 expression. These outcomes are in accordance with different experimental studies demonstrating DIOS’ antiapoptotic effect [28,61,62].
To scrutinize further molecular mechanisms underlying the anti-inflammatory and anti-apoptotic responses brought by DIOS, renal expression of p38-MAPK and NF-κB were evaluated. Being involved in the inflammatory response and apoptosis, p38-MAPK is essential for the production of the pro-inflammatory cytokines, comprising IL-1β and TNF-α; it regulates NF-κB activation and controls cell apoptosis in renal injury [13]. NF-κB regulates various cellular responses such as innate immunity, inflammation, apoptosis, growth, and development [63]. It is expressed in renal impairment and involved in inflammatory responses [64,65]. Moreover, NF-κB activation in response to ROS could be implicated in GNT nephrotoxicity [66]. The current study showed that GNT boosted renal expression of p38-MAPK and NF-κB. These findings are matching with the results of former studies [14,67]. Nevertheless, pretreatment with DIOS markedly reversed these alterations, unveiling that the anti-inflammatory and anti-apoptotic effects of DIOS perceived in this study may be related to the downregulation of p38-MAPK and NF-κB. Our findings are in line with earlier research [29,30].
Dysfunctional miRNA expression has been implicated in the progression of kidney injury [68,69]. miR-21 is known to regulate apoptosis as well as inflammatory and fibrotic pathways in acute renal injury [70]. It was found to up-regulate the survival factor BCL2 and suppress the pro-apoptotic programmed cell death protein 4 (PDCD4) gene expression as well as the level of active caspase-3 in the kidneys of mice [71]. Similarly, various studies demonstrated the protective effect of miR-21 against renal ischemia-reperfusion injury by hindering the inflammatory response and apoptosis [72,73,74]. On the contrary, preceding in vivo and in vitro studies verified that miR-21 overexpression resulted in the up-regulation of pro-inflammatory cytokines, reflecting the dual role miR-21 could play in response to different stimuli [75,76]. Various reports have documented the role of miR-155 in the control of inflammatory reactions [23]. In the kidneys, elevated expression of miR-155 has been found in renal cancer, end-stage renal disease, immunological events, as well as in response to injury [22,77,78,79,80]. To further characterize the potential mechanistic pathway behind the reno-protective effect of DIOS against GNT-induced-renal damage, we assayed miR-21 and -155 expression with the qRT-PCR technique. In the current work, GNT-treated rats exhibited a marked decline in miR-21 expression together with a significant increase in miR-155 expression, which is in parallel with Saikumar et al. [23] and Mohamed et al. [81]. Interestingly, DIOS reversed the alterations in miR-21 and miR-155 gene expression induced by GNT indicating potential inhibition of apoptosis and inflammation. Far as we could tell, our study represents an unprecedented investigation of the role of DIOS in miR-21 and -155 expression in kidney tissue.
Taken together, our results demonstrated a reno-protective ability of DIOS versus GNT-induced renal damage, which may be ascribed to mitigation of the oxidative stress and amelioration of p38-MAPK and NF-κB pathways as well as miR-21 and -155 renal expression that subsequently engages in the inhibition of apoptosis and inflammation. These findings suggest that DIOS could serve as an adjuvant therapy with GNT to halt its nephrotoxic adverse effect.

Author Contributions

Conceptualization, R.I.N., A.S.A., N.S.Y. and H.I.A.; Methodology, R.I.N., A.S.A. and H.I.A.; Software, R.I.N. and A.S.A.; Validation, R.I.N. and A.S.A.; Formal Analysis, R.I.N., A.S.A., N.S.Y. and H.I.A.; Investigation, R.I.N. and A.S.A.; Resources, R.I.N., A.S.A., N.S.Y. and H.I.A.; Data Curation, R.I.N. and H.I.A.; Writing Original Draft Preparation, R.I.N., A.S.A., N.S.Y. and H.I.A.; Writing Review and Editing, R.I.N., A.S.A. and H.I.A.; Visualization, R.I.N., A.S.A. and N.S.Y.; Supervision, R.I.N. and H.I.A.; Project Administration, R.I.N., A.S.A., N.S.Y. and H.I.A.; Funding Acquisition, R.I.N., A.S.A., N.S.Y. and H.I.A. All authors have read and agreed to the published version of the manuscript.

Funding

This work was partially supported through the Annual Funding track by the Deanship of Scientific Research, Vice Presidency for Graduate Studies and Scientific Research, King Faisal University, Saudi Arabia, [Project No. GRANT2,322].

Institutional Review Board Statement

All experiments in this study were accomplished in agreement with the ethical procedures and policies approved by the Ethics Committee of Faculty of Pharmacy, (Girls), Al-Azhar University (Approval number: 318) and encountered with the terms of the US National Institutes of Health guide for the care and use of laboratory animals (NIH Publications No. 85-23, revised 2011).

Informed Consent Statement

Not applicable.

Data Availability Statement

Data are contained within the article.

Acknowledgments

The authors express their gratitude to Adel B. Kolosy (Cairo University, Egypt) for his assistance in the histopathological investigation.

Conflicts of Interest

None of the stated authors have conflict of interest to declare.

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Figure 1. Impact of diosmin on the alterations in the kidney levels of HO-1 (A) and Nrf2 (B) induced by gentamicin: Values designates the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: GNT, gentamicin; HO-1, heme oxygenase-1; Nrf2, nuclear factor E2-related factor 2; DIOS, diosmin.
Figure 1. Impact of diosmin on the alterations in the kidney levels of HO-1 (A) and Nrf2 (B) induced by gentamicin: Values designates the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: GNT, gentamicin; HO-1, heme oxygenase-1; Nrf2, nuclear factor E2-related factor 2; DIOS, diosmin.
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Figure 2. Impact of diosmin on renal inflammation induced by gentamicin (IL-1β (A), TNF-α (B), p38 MAPK (C) and NF-κB (D): the values designate the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: GNT, gentamicin; IL-1β, interlukin-1 beta; NF-κB, nuclear factor-κappa B; p38 MAPK, p38 mitogen-activated protein kinase; DIOS, diosmin; TNF-α, tumor necrosis factor-alpha.
Figure 2. Impact of diosmin on renal inflammation induced by gentamicin (IL-1β (A), TNF-α (B), p38 MAPK (C) and NF-κB (D): the values designate the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: GNT, gentamicin; IL-1β, interlukin-1 beta; NF-κB, nuclear factor-κappa B; p38 MAPK, p38 mitogen-activated protein kinase; DIOS, diosmin; TNF-α, tumor necrosis factor-alpha.
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Figure 3. Impact of diosmin on the alterations in the renal apoptotic markers induced by gentamicin (BAX (A), Bcl-2 (B), BAX/ Bcl-2 ratio (C) and caspase-3 (D): The values designate the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: BAX, Bcl-2-associated X protein; Bcl-2, B-cell lymphoma 2; GNT, gentamicin; DIOS, diosmin.
Figure 3. Impact of diosmin on the alterations in the renal apoptotic markers induced by gentamicin (BAX (A), Bcl-2 (B), BAX/ Bcl-2 ratio (C) and caspase-3 (D): The values designate the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: BAX, Bcl-2-associated X protein; Bcl-2, B-cell lymphoma 2; GNT, gentamicin; DIOS, diosmin.
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Figure 4. Impact of diosmin on the alterations in the renal expression of MiR-21 (A) and -155 (B) induced by gentamicin: The values designate the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: GNT, gentamicin; MiR, micro-RNA; DIOS, diosmin.
Figure 4. Impact of diosmin on the alterations in the renal expression of MiR-21 (A) and -155 (B) induced by gentamicin: The values designate the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: GNT, gentamicin; MiR, micro-RNA; DIOS, diosmin.
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Figure 5. Descriptive photomicrographs of renal sections stained by hematoxylin-eosin (H and E) stain (magnification × 40) (n = 6). (A,F) Control and DIOS groups revealing normal histological appearance of the glomeruli (g) and tubules (t) at the cortex. (B) GNT group exhibiting coagulative necrosis (co) that was observed in a diffuse manner all over the lining tubular epithelium at the cortex. (C) GNT group presenting inflammatory cells infiltration (m) amongst the degenerated tubules at the cortex. (D) GNT group indicating cystic dilatation (cys) and degeneration (d) in the tubules at the corticomedullary portion. (E) GNT + DIOS group showing focal few inflammatory cells (m) infiltration amongst the tubules at the cortex.
Figure 5. Descriptive photomicrographs of renal sections stained by hematoxylin-eosin (H and E) stain (magnification × 40) (n = 6). (A,F) Control and DIOS groups revealing normal histological appearance of the glomeruli (g) and tubules (t) at the cortex. (B) GNT group exhibiting coagulative necrosis (co) that was observed in a diffuse manner all over the lining tubular epithelium at the cortex. (C) GNT group presenting inflammatory cells infiltration (m) amongst the degenerated tubules at the cortex. (D) GNT group indicating cystic dilatation (cys) and degeneration (d) in the tubules at the corticomedullary portion. (E) GNT + DIOS group showing focal few inflammatory cells (m) infiltration amongst the tubules at the cortex.
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Table
Table 1. Effect of DIOS on GNT-induced changes in relative kidney weight.
Table 1. Effect of DIOS on GNT-induced changes in relative kidney weight.
GroupsRelative Kidney Weight %
Control0.369 ± 0.026
GNT0.481 ± 0.085 a
GNT + DIOS0.406 ± 0.021 b
DIOS0.322 ± 0.034 b,c
Values designate the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: GNT, gentamicin; DIOS, diosmin.
Table
Table 2. Effect of DIOS on GNT-induced alterations in renal function biomarkers.
Table 2. Effect of DIOS on GNT-induced alterations in renal function biomarkers.
GroupsBUNSCrKIM-1
Control32.57 ± 2.4210.175 ± 0.034107.80 ± 3.794
GNT120.40 ± 5.328 a1.417 ± 0.339 a332.50 ± 28.120 a
GNT + DIOS61.52 ± 7.413 a,b0.416 ± 0.018 b164.50 ± 5.526 a,b
DIOS40.67 ± 5.901 b,c0.194 ± 0.020 b104.50 ± 6.237 b,c
The values designate the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: BUN, blood urea nitrogen; GNT, gentamicin; KIM-1, kidney injury molecule-1; DIOS, diosmin; SCr, serum creatinine.
Table
Table 3. Effect of DIOS on GNT-induced renal oxidative stress.
Table 3. Effect of DIOS on GNT-induced renal oxidative stress.
GroupsMDATACSOD
Control44.50 ± 4.47279.58 ± 8.69542.68 ± 4.377
GNT190.2 ± 13.040 a31.12 ± 4.481 a15.51 ± 1.350 a
GNT + DIOS84.88 ± 9.566 a,b51.20 ± 3.913 a,b33.45 ± 2.931 a,b
DIOS50.91 ± 9.671 b,c70.82 ± 2.971 b,c44.37 ± 3.258 b,c
The values designate the mean ± SD (n = 6). a: statistically significant from the control group, b: statistically significant from the GNT group, c: statistically significant from the GNT + DIOS group, p < 0.05 determined with one-way ANOVA tailed by Tukey’s multiple comparisons test. Abbreviations: GNT, gentamicin; MDA, malondialdehyde; DIOS, diosmin; SOD, superoxide dismutase; TAC, total antioxidant capacity.
Table
Table 4. Semiquantitative histological score of the kidney sections.
Table 4. Semiquantitative histological score of the kidney sections.
GroupsTubular Coagulative NecrosisPerivascular Edema and Inflammatory Cells InfiltrationTubular DegenerationFocal Inflammatory Cells Infiltration
Control----
GNT++++++++
GNT+ DIOS---+
DIOS----
At least, six fields for each kidney section were examined and assigned for the severity of changes using a score of (-) for negative, (+) for mild, (++) for moderate or (+++) for severe histopathological alterations (n = 6). Abbreviations: GNT, gentamicin; DIOS, diosmin.
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MDPI and ACS Style

Nadeem, R.I.; Aboutaleb, A.S.; Younis, N.S.; Ahmed, H.I. Diosmin Mitigates Gentamicin-Induced Nephrotoxicity in Rats: Insights on miR-21 and -155 Expression, Nrf2/HO-1 and p38-MAPK/NF-κB Pathways. Toxics 2023, 11, 48. https://doi.org/10.3390/toxics11010048

AMA Style

Nadeem RI, Aboutaleb AS, Younis NS, Ahmed HI. Diosmin Mitigates Gentamicin-Induced Nephrotoxicity in Rats: Insights on miR-21 and -155 Expression, Nrf2/HO-1 and p38-MAPK/NF-κB Pathways. Toxics. 2023; 11(1):48. https://doi.org/10.3390/toxics11010048

Chicago/Turabian Style

Nadeem, Rania I., Amany S. Aboutaleb, Nancy S. Younis, and Hebatalla I. Ahmed. 2023. "Diosmin Mitigates Gentamicin-Induced Nephrotoxicity in Rats: Insights on miR-21 and -155 Expression, Nrf2/HO-1 and p38-MAPK/NF-κB Pathways" Toxics 11, no. 1: 48. https://doi.org/10.3390/toxics11010048

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