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Search Results (578)

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16 pages, 1611 KB  
Article
Evaluation of the Nrf2-Keap1 Pathway in Patients with Acute Cerebral Ischemic Disease
by Gizem Alkan, Fatih Koçtürk, Ayşe Karakus, Muhammed Enes Taysi and Seyithan Taysi
Medicina 2026, 62(7), 1371; https://doi.org/10.3390/medicina62071371 - 16 Jul 2026
Viewed by 401
Abstract
Background and Objectives: Acute cerebral ischemia is characterized by excessive oxidative stress and impaired antioxidant defense mechanisms, in which the nuclear factor erythroid 2–related factor 2 (Nrf2)–Kelch-like ECH-associated protein 1 (Keap1) signaling pathway plays a pivotal regulatory role. This study aimed to [...] Read more.
Background and Objectives: Acute cerebral ischemia is characterized by excessive oxidative stress and impaired antioxidant defense mechanisms, in which the nuclear factor erythroid 2–related factor 2 (Nrf2)–Kelch-like ECH-associated protein 1 (Keap1) signaling pathway plays a pivotal regulatory role. This study aimed to investigate serum levels of Nrf2–Keap1 pathway components and associated oxidative stress biomarkers in patients with acute ischemic stroke. Materials and Methods: Eighty-eight patients diagnosed with ischemic stroke who presented within 24 h of the onset of neurological deficit and met the inclusion criteria, along with 72 healthy control subjects without a history of acute ischemic stroke, were included in the study. Serum levels of Nrf2, Keap1, glycogen synthase kinase-3β (GSK-3β), heme oxygenase-1 (HO-1), glutathione (GSH), and 4-hydroxynonenal (4-HNE) were quantified using enzyme-linked immunosorbent assay (ELISA). Receiver operating characteristic (ROC) analysis was performed to evaluate the diagnostic performance of the biomarkers. Results: Compared with controls, patients exhibited significantly reduced Nrf2 levels and markedly elevated Keap1 and 4-HNE levels. HO-1 and GSH concentrations were also significantly increased in the patient group, whereas GSK-3β levels did not differ significantly between groups. ROC analysis demonstrated that 4-HNE and Nrf2 possessed the highest discriminative capacity for acute ischemic stroke. Conclusions: These findings suggest that acute cerebral ischemia is associated with dysregulation of the Nrf2–Keap1 axis accompanied by enhanced lipid peroxidation and oxidative burden. Although increased HO-1 and GSH levels may reflect a compensatory antioxidant response, elevated 4-HNE levels indicate persistent oxidative injury. Full article
(This article belongs to the Section Neurology)
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16 pages, 2374 KB  
Article
Genome-Wide Identification, Characterization, and Functional Analysis of the GSK3/Shaggy-like Gene Family in Melon (Cucumis melo L.)
by Peng Tian, Bing Li, Jingjing Zhang, Xiurui Gao, Wei Liu, Bowen Liu, Zhaowei Li, Jing Yang, Mengyuan Su, Jige Dang and Yanrong Wu
Horticulturae 2026, 12(7), 784; https://doi.org/10.3390/horticulturae12070784 - 26 Jun 2026
Viewed by 760
Abstract
Glycogen synthase kinase 3 (GSK3/Shaggy-like) belongs to evolutionarily conserved serine/threonine protein kinases that regulate plant morphological development, multi-hormone crosstalk and adaptation to abiotic stresses. However, systematic genome-wide characterization of CmGSK3 is still absent in melon (Cucumis melo L.). This study identified six [...] Read more.
Glycogen synthase kinase 3 (GSK3/Shaggy-like) belongs to evolutionarily conserved serine/threonine protein kinases that regulate plant morphological development, multi-hormone crosstalk and adaptation to abiotic stresses. However, systematic genome-wide characterization of CmGSK3 is still absent in melon (Cucumis melo L.). This study identified six CmGSK3 members on a whole-genome level, unevenly distributed among four chromosomes. Combined phylogenetic and synteny profiling separated these six genes into four conserved subclades; orthologous links were discovered between melon, Arabidopsis, and rice, revealing evolutionary conservation between monocot and dicot crops. Prediction of promoter cis-regulatory motifs combined with transcriptome datasets suggested that CmGSK3 genes participate in hormone transduction and environmental stress adaptation. Quantitative real-time PCR further verified that exogenous brassinosteroid (BR) application dramatically induced transcriptional accumulation of CmSK21 and CmSK22. Heterologous overexpression of these two genes in wild-type Arabidopsis significantly lowered plant sensitivity to BR, confirming they may function as negative modulators of the BR signaling cascade. Collectively, CmGSK3 members coordinate multiple metabolic routes, dominated by BR-related signal transduction, to manipulate melon growth and stress adaptability. This study establishes the first systematic research on the melon GSK3 family and supplies elite candidate genes for molecular breeding targeting fruit quality and stress resistance improvement in melon. Full article
(This article belongs to the Special Issue Germplasm Resources and Genetics Improvement of Watermelon and Melon)
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13 pages, 3014 KB  
Article
Aronia Bioactive Fraction-Alginic Acid Nanocomplex-Modulates Tau Phosphorylation and Aggregation in Cell Models of Alzheimer’s Disease
by Hye-Yeon Kang, Bong-Keun Jang, Seong-Hoon Yun, Hee-Yeong Jeong, Eunkuk Park, Kang-Il Oh, Junhwan Jeong and Seon-Yong Jeong
Int. J. Mol. Sci. 2026, 27(13), 5748; https://doi.org/10.3390/ijms27135748 - 25 Jun 2026
Viewed by 290
Abstract
Preventing or reversing Tau hyperphosphorylation and aggregation represent critical objectives in the development of effective therapies for Alzheimer’s disease. The present study investigated the potential of a novel Aronia bioactive fraction—alginic acid nanocomplex (AANCP)—to simultaneously inhibit pathological features of Alzheimer’s disease. Evaluations of [...] Read more.
Preventing or reversing Tau hyperphosphorylation and aggregation represent critical objectives in the development of effective therapies for Alzheimer’s disease. The present study investigated the potential of a novel Aronia bioactive fraction—alginic acid nanocomplex (AANCP)—to simultaneously inhibit pathological features of Alzheimer’s disease. Evaluations of Aronia bioactive fraction (ABF) and low-molecular-weight alginic acid (LAA), utilized both individually and as AANCP, were conducted in HEK293-TauP301L and SH-SY5Y-TauP301L cell models of Alzheimer’s disease. Both ABF and LAA reduced the expression of total Tau and Tau phosphorylated at Ser396 in a concentration-dependent manner, with AANCP demonstrating significant synergistic activity of its components. Notably, the optimal AANCP ratio was 1:1 and 1:8 for inhibiting Tau phosphorylation and Tau aggregation, respectively. Mechanistically, AANCP inhibited Tau phosphorylation by upregulating p-Akt (phosphorylated protein kinase B) and p-GSK-3β (phosphorylated glycogen synthase kinase-3 beta), while also enhancing the activity of methylated PP2A, a key Tau phosphatase. Furthermore, AANCP exhibited superior efficacy in inhibiting heparin-induced Tau aggregation compared to the individual components. Analysis of autophagy markers indicated that the nanocomplex enhanced Tau clearance, as shown by increased LC3-II and Beclin-1 levels and reduced p62 levels. These results suggest AANCP as a promising therapeutic candidate that simultaneously reduces Tau phosphorylation and aggregation and facilitates autophagic Tau clearance, offering a potent, synergistic strategy for treating Alzheimer’s disease. Full article
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22 pages, 12313 KB  
Article
Evaluation of the Anti-Cancer Effects of KMU-11342 in In Vitro and Ex Vivo Models of Colorectal Cancer
by Jieun Jeon, Jeongin Jang, Chae Young Moon, Jinho Lee, Victor Sukbong Hong, Hyunju Kang, Jee Young Park, Na Hyeon Heo, Jong-Wook Park, Jae-Hyung Park, Jae-Ho Lee, Hye Won Lee, Sung Uk Bae, Hyunsu Lee and Shin Kim
Pharmaceuticals 2026, 19(7), 985; https://doi.org/10.3390/ph19070985 - 25 Jun 2026
Viewed by 667
Abstract
Background/Objectives: Colorectal cancer (CRC) remains one of the leading causes of cancer-related morbidity and mortality worldwide. Despite advances in treatment, outcomes for advanced CRC remain unsatisfactory due to uncontrolled proliferation, metastasis, and recurrence. This study investigated the anti-cancer effects of KMU-11342, an [...] Read more.
Background/Objectives: Colorectal cancer (CRC) remains one of the leading causes of cancer-related morbidity and mortality worldwide. Despite advances in treatment, outcomes for advanced CRC remain unsatisfactory due to uncontrolled proliferation, metastasis, and recurrence. This study investigated the anti-cancer effects of KMU-11342, an indolin-2-one-based multi-protein kinase inhibitor with previously reported anti-inflammatory properties, in human colorectal cancer models. Methods: The anti-cancer effects of KMU-11342 were evaluated in colorectal cancer cells and further investigated in three-dimensional (3D) spheroid and patient-derived organoid models. Cell proliferation, migration, apoptosis, and cell cycle progression were assessed. Kinase activity profiling and molecular docking analyses were performed to identify potential targets and characterize the underlying signaling pathways. Results: KMU-11342 significantly inhibited the proliferation and migration of CRC cells. It reduced CRC cell density by 58.9% and 83.3% at 0.5 and 1 μM, respectively. These effects were accompanied by G2/M cell cycle arrest and apoptotic cell death. In 3D models, spheroid formation was markedly reduced and stemness-related characteristics were diminished. Patient-derived CRC organoids also showed decreased viability, exhibiting 38.6% and 77.4% reductions at 1 and 2 μM, respectively. These effects were observed in a dose-dependent manner in both two-dimensional (2D) and 3D colorectal cancer models. Kinase activity profiling and molecular docking analyses identified glycogen synthase kinase 3 beta (GSK3β) and cyclin-dependent kinase 1 (CDK1) as potential mediators of the anti-cancer effects of KMU-11342 through the p53/nuclear factor kappa B (NF-κB) and FoxO1 signaling axes, respectively. Conclusions: KMU-11342 exhibits potent anti-tumor activity against CRC through suppressing proliferation, migration, and stemness in both 2D and 3D models, including patient-derived organoids. Its effects may be mediated, at least in part, through modulation of GSK3β and CDK1 via the p53/NF-κB and FoxO1 signaling pathways. Full article
(This article belongs to the Topic Kinases in Cancer and Other Diseases, 2nd Edition)
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23 pages, 18655 KB  
Article
Synthetic Small Molecules as Regulators of In Vitro Multiplication in Selenicereus Hybrids
by Malen Escánez, Alejandro Miralles-Rodríguez, Sandra Gil, Francisco Bermúdez, Santiago Vilanova, Elena Carneros, Ana Martinez, Carmen Gil, Pilar S. Testillano and Edgar García-Fortea
Plants 2026, 15(13), 1931; https://doi.org/10.3390/plants15131931 - 23 Jun 2026
Viewed by 424
Abstract
Micropropagation of Selenicereus hybrids is a key tool for breeding and conservation; however, further refining the balance between high multiplication rates and morphological quality remains a complex challenge within conventional protocols. This study explores targeted signaling modulation using nine bioactive small molecules—including three [...] Read more.
Micropropagation of Selenicereus hybrids is a key tool for breeding and conservation; however, further refining the balance between high multiplication rates and morphological quality remains a complex challenge within conventional protocols. This study explores targeted signaling modulation using nine bioactive small molecules—including three mammalian glycogen synthase kinase 3 (GSK3) inhibitors (TDZD-9, VP3.15 and VP0.7), three leucine rich repeat kinase 2 (LRRK2) inhibitors (JZ1.24, JZ1.3 and IGS4.75), and three phosphodiesterase (PDE) inhibitors—to complement traditional micropropagation. Explants were evaluated in two distinct contexts: a hormone-free basal medium (BM) and a plant growth regulator-supplemented medium (PIT2) and the response rates, yield, and quality were measured and integrated using a Global Efficiency Index (GEI). Results demonstrate that inhibitor efficacy is strictly context-dependent; while most molecules repressed budding in BM, they acted as response modulators by determining the specific type of morphogenic pathway in PIT2. Notably, the GSK3 inhibitor TDZD-9 reached the highest GEI (0.85) by maximizing productivity, whereas LRRK2 inhibitors effectively preserved architectural integrity. Flow cytometry confirmed cytogenetic stability across all treatments, with a 98.5% plantlet survival rate during acclimatization. In conclusion, the strategic integration of targeted signaling modulators and multi-parametric indices offers a refined and objective framework to enhance the efficiency of mass propagation protocols in pitahaya and other recalcitrant species. Furthermore, our findings provide new evidence of the strong potential of these small molecules as novel tools to improve plant micropropagation beyond traditional plant growth regulators. Full article
(This article belongs to the Special Issue Plant Tissue Culture and Plant Regeneration—2nd Edition)
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15 pages, 1432 KB  
Article
Insulin Regulates AKT/GSK-3β Signalling, Tau Phosphorylation, and Redox Homeostasis in SH-SY5Y Neuroblastoma Cells
by Adrian Jorda, Kenia Alvarez-Gamez, Sara Vergani, Ilenia Paba, Mar Perez, Martin Aldasoro, Jose M. Vila and Soraya L. Valles
Int. J. Mol. Sci. 2026, 27(12), 5565; https://doi.org/10.3390/ijms27125565 - 19 Jun 2026
Viewed by 553
Abstract
Insulin (Ins) regulates multiple intracellular signalling pathways involved in cell survival, oxidative stress responses, and tau phosphorylation. Dysregulation of these pathways has been implicated in neurodegenerative disorders, including Alzheimer’s disease (AD). The present study evaluated the effects of insulin on protein kinase B/glycogen [...] Read more.
Insulin (Ins) regulates multiple intracellular signalling pathways involved in cell survival, oxidative stress responses, and tau phosphorylation. Dysregulation of these pathways has been implicated in neurodegenerative disorders, including Alzheimer’s disease (AD). The present study evaluated the effects of insulin on protein kinase B/glycogen synthase kinase-3 beta (AKT/GSK-3β) signalling, tau phosphorylation, and oxidative stress-related markers in SH-SY5Y neuroblastoma cells. Cell metabolic activity was assessed using the (diphenyltetrazolium bromide) MTT assay, while cell number and viability were evaluated by Trypan Blue exclusion, necrosis by lactate dehydrogenase (LDH) release, and apoptosis by Caspase-3 activity. Western blot analysis was performed to evaluate the expression of phosphorylated AKT (p-AKT), phosphorylated GSK-3β (p-GSK-3β Ser9), phosphorylated TAU (pTAU), nuclear factor erythroid 2-related factor 2 (NRF2), manganese superoxide dismutase (Mn-SOD), and copper/zinc superoxide dismutase (Cu/Zn-SOD). Lipid peroxidation was determined by measuring malondialdehyde (MDA) levels using a colorimetric/fluorometric assay. Insulin treatment increased MTT reduction (31.25%) and cell metabolic activity (119.15%) while reducing LDH release (19.2%) and Caspase-3 activity (31.26%). In addition, insulin significantly increased p-AKT (34.2%) and p-GSK-3β (Ser9) (19.9%) levels. A reduction in pTAU levels (53.39%) was also observed following insulin treatment. Furthermore, insulin increased NRF2 expression (18.77%), Cu/Zn-SOD (37.29%), and Mn-SOD (50.16%) and reduced MDA levels (13.95%). These findings indicate that insulin modulates signalling pathways associated with tau phosphorylation and cellular redox regulation in SH-SY5Y cells. Insulin treatment was associated with increased AKT and GSK-3β phosphorylation, reduced tau phosphorylation, and changes in oxidative stress-related markers in SH-SY5Y neuroblastoma cells. These findings support a role for insulin in the modulation of molecular pathways implicated in cellular stress responses and tau regulation. Further studies using differentiated neuronal models and disease-relevant conditions are required to determine the relevance of these observations to neurodegenerative disorders. Full article
(This article belongs to the Section Molecular Neurobiology)
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17 pages, 2757 KB  
Review
Glycogen and Glycosylation: Friends or Foes?
by Rohit Sai Reddy Konada, James Osborn and Sharmistha Mitra
Biomolecules 2026, 16(6), 885; https://doi.org/10.3390/biom16060885 - 16 Jun 2026
Viewed by 705
Abstract
Glycosylation, glycogen metabolism, and ubiquitination represent three fundamental cellular processes that are traditionally studied as distinct aspects of biology. Glycosylation and glycogen metabolism are unique carbohydrate-based pathways. The process of glycosylation generates structurally diverse glycans that regulate protein folding, cell signaling, and host–pathogen [...] Read more.
Glycosylation, glycogen metabolism, and ubiquitination represent three fundamental cellular processes that are traditionally studied as distinct aspects of biology. Glycosylation and glycogen metabolism are unique carbohydrate-based pathways. The process of glycosylation generates structurally diverse glycans that regulate protein folding, cell signaling, and host–pathogen interactions, while glycogen serves as a glucose reserve essential for energy homeostasis. Emerging evidence reveals a deep mechanistic connection between these pathways, particularly in the context of brain biology and inherited metabolic diseases. Here, we present recent research linking glycosylation defects with glycogen metabolism, highlighting how changes in the shared metabolites and enzymatic pathways contribute to human health and disease. We then discuss the overlapping disease symptoms of congenital disorders of glycosylation and glycogen storage diseases, with particular emphasis on polyglucosan body-forming diseases. We also highlight the role of non-canonical ubiquitin ligase complexes such as laforin–malin and LUBAC and present emerging evidence for their potential role in the glycogen quality-control mechanism. Finally, we review current therapeutic strategies for CDGs and GSDs, including monosaccharide supplementation, glycogen synthase modulation, and gene therapy. Together, this review underscores glycogen as more than an energy store—as a key contributor to glycosylation homeostasis and cellular regulation in health and disease. Full article
(This article belongs to the Special Issue Glycomics in Health, Aging and Disease)
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12 pages, 2951 KB  
Article
The Aquaporin Gene SbPIP1;2 Is Involved in Dormancy Release and Regulated Under Low Temperatures in Lilium ‘Siberia’
by Xuanmei Cai, Mingli Ke, Danfeng Ge and Zhimin Lin
Horticulturae 2026, 12(6), 721; https://doi.org/10.3390/horticulturae12060721 - 12 Jun 2026
Viewed by 803
Abstract
The dormancy of lilies is an important physiological process involving vernalisation and the differentiation and maturation of flower buds. We have cloned an aquaporin, SbP1P1;2, from the Lilium ‘Siberia’. Subcellular localisation analysis indicates that it is a protein that is localised to [...] Read more.
The dormancy of lilies is an important physiological process involving vernalisation and the differentiation and maturation of flower buds. We have cloned an aquaporin, SbP1P1;2, from the Lilium ‘Siberia’. Subcellular localisation analysis indicates that it is a protein that is localised to the plasma membrane in Nicotiana benthamiana. VIGS-mediated transient silencing revealed that silencing the SbPIP1;2 gene inhibited the development of lily flower buds, while those in the control group differentiated earlier to the anther primordia stage. Notably, the ABA levels in the control group had dropped significantly by day 63, suggesting that dormancy ended earlier than in the treatment group. The test plants’ phenotype is characterised primarily by the fact that silencing the SbPIP1;2 gene inhibits both flower bud development and root growth. The dormancy-to-sleep transition phase (PS vs. TS) was also the period during which the largest number of differentially expressed genes was observed. KEGG enrichment analysis indicates that starch and sucrose metabolic pathways are most active from the onset to the completion of dormancy release and that significant differences occur in several key genes within these pathways. These include alpha-trehalose-phosphate synthase (TPS), sucrose phosphate synthase (SPS), trehalase (TREH), fructokinase-1 (E2.7.1.1), beta-glucosidase (bglB), glycogen synthase (glgA), glucose-6-phosphate isomerase (GPI), and ectonucleotide pyrophosphatase/phosphodiesterase family members 1 and 3 (ENPP1/3). The discovery that aquaporins promote dormancy breaking in lilies is a highly successful case study for aquaporin research in flowers. Full article
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15 pages, 2852 KB  
Article
Maternal Pregestational Diabetes Contributes to Neural Tube Defects in Mouse Fetuses Through H4K5ac-Mediated Regulation of Focal Adhesion Pathway
by Jiaxin Cheng, Kexin Zhang, Shuangshuang Yang, Baoling Bai and Qin Zhang
Genes 2026, 17(6), 671; https://doi.org/10.3390/genes17060671 - 8 Jun 2026
Viewed by 432
Abstract
Objectives: To investigate the potential mechanisms of maternal pregestational diabetes-induced neural tube defects (NTDs) by integrating proteomic data and histone H4 lysine 5 acetylation (H4K5ac) ChIP-seq data from the mouse model. Methods: The diabetic mouse model was established by intraperitoneal injection [...] Read more.
Objectives: To investigate the potential mechanisms of maternal pregestational diabetes-induced neural tube defects (NTDs) by integrating proteomic data and histone H4 lysine 5 acetylation (H4K5ac) ChIP-seq data from the mouse model. Methods: The diabetic mouse model was established by intraperitoneal injection of streptozotocin (STZ) into female friend leukemia virus B strain (FVB) mice, with subsequent blood glucose monitoring. Diabetic females were then mated with healthy males, and embryonic tissues were collected on embryonic day 9.5. Among the embryos obtained from diabetic pregnancies, six NTDs embryos and six control embryos were selected for protein expression profiling using tandem mass tag (TMT)-labeled liquid chromatography-tandem mass spectrometry (LC-MS/MS), as well as for assessment of H4K5ac modification by ChIP-seq. Multi-omics integration was performed to identify common differentially expressed genes, followed by functional enrichment analysis. Key genes were validated using RT-qPCR. Results: Proteomic analysis revealed that differentially expressed proteins were significantly enriched in focal adhesion pathway. Protein–protein interaction (PPI) network analysis indicated that these proteins (e.g., Integrin alpha 3 (Itga3), glycogen synthase kinase 3 beta (Gsk3b), mitogen-activated protein kinase 9 (Mapk9)) were associated with focal adhesion and cytoskeletal functions. Integrated multi-omics analysis identified 923 common differentially expressed genes, which were also significantly enriched in focal adhesion pathway. Within this pathway, the protein expression levels of Itga3, Gsk3b, and Mapk9 exhibited a consistent co-variation trend with H4K5ac enrichment. RT-qPCR results confirmed that Itga3 was significantly up-regulated, while Gsk3b was down-regulated in the NTDs group (p < 0.05). Conclusions: Maternal pregestational diabetes may contribute to NTDs by disrupting cytoskeletal reorganization, cell adhesion, and migration processes. This disruption is likely mediated through H4K5ac-regulated expression of key focal adhesion pathway genes such as Itga3 and Gsk3b. Full article
(This article belongs to the Section Epigenomics)
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24 pages, 9738 KB  
Article
Protective Effects of Violaxanthin on Cellular Oxidative Stress via NRF2 Activation in H2O2-Stimulated Human Keratinocytes
by Ji-Seon Kim, Hee Su Kim, Hee-Jae Shin, Seokmuk Park, Ji Won Kim, Su-Bin Park, Hee-Sik Kim, Yong Jae Lee and Seunghee Bae
Appl. Sci. 2026, 16(10), 5132; https://doi.org/10.3390/app16105132 - 21 May 2026
Viewed by 543
Abstract
Excessive accumulation of reactive oxygen species from exogenous and endogenous stressors can cause cellular damage. Chlorella contains diverse bioactive compounds, and violaxanthin, a major carotenoid pigment found in Chlorella sp. HS-V, has been reported to possess anti-inflammatory, anticancer, and antioxidant properties. We investigated [...] Read more.
Excessive accumulation of reactive oxygen species from exogenous and endogenous stressors can cause cellular damage. Chlorella contains diverse bioactive compounds, and violaxanthin, a major carotenoid pigment found in Chlorella sp. HS-V, has been reported to possess anti-inflammatory, anticancer, and antioxidant properties. We investigated the effect of violaxanthin on hydrogen peroxide (H2O2)-induced oxidative stress in human keratinocytes. Chlorella sp. HS-V extract significantly restored the H2O2-induced decrease in cell viability. Similarly, violaxanthin reduced H2O2-induced cytotoxicity and intracellular reactive oxygen species levels, which was associated with the upregulation of antioxidant enzyme expression. Under H2O2-induced oxidative stress conditions, violaxanthin may enhance cellular antioxidant defense by promoting nuclear factor erythroid 2-related factor 2 (NRF2) translocation through the phosphoinositide 3-kinase/protein kinase B/glycogen synthase kinase 3β (PI3K/AKT/GSK3β) signaling pathway. Additionally, violaxanthin improved H2O2-impaired wound healing in HaCaT human keratinocyte cells and reduced senescence-associated beta-galactosidase-positive normal human epidermal keratinocytes. Overall, these findings suggest that violaxanthin may serve as a potential therapeutic agent for mitigating oxidative stress-induced cellular dysfunction. Full article
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25 pages, 4213 KB  
Review
A Paradigm Shift: Arrhythmogenic Cardiomyopathy Is an Inflammatory Disease
by Gallage H. D. N. Ariyaratne, Andrea Villatore, Giovanni Peretto and Stephen P. Chelko
Cells 2026, 15(10), 868; https://doi.org/10.3390/cells15100868 - 9 May 2026
Cited by 1 | Viewed by 1237
Abstract
Arrhythmogenic cardiomyopathy (ACM) is a genetic myocardial disorder marked by progressive cardiomyocyte loss, fibro-fatty replacement, ventricular arrhythmias, and risk of sudden cardiac death. Traditionally considered a structural and electrical disease driven by desmosomal dysfunction, emerging evidence redefines ACM as an inflammatory cardiomyopathy in [...] Read more.
Arrhythmogenic cardiomyopathy (ACM) is a genetic myocardial disorder marked by progressive cardiomyocyte loss, fibro-fatty replacement, ventricular arrhythmias, and risk of sudden cardiac death. Traditionally considered a structural and electrical disease driven by desmosomal dysfunction, emerging evidence redefines ACM as an inflammatory cardiomyopathy in which immune activation plays a central role. This review integrates genetic, molecular, experimental, and clinical data to highlight inflammation as a unifying feature of ACM. Desmosomal gene variants impair cell adhesion and also activate cardiomyocyte-intrinsic inflammatory pathways, including nuclear factor of kappa B (NFκB) and glycogen synthase kinase 3β (GSK3β) signaling, promoting cytokine release, immune cell recruitment, and fibrotic remodeling. Preclinical studies suggest inflammation precedes structural changes, indicating it may be an initiating event rather than a secondary response. Clinical and pathological findings support this model, with inflammatory infiltrates, circulating cytokines, and autoantibodies observed across disease stages. These processes often present as episodic “hot phases” resembling myocarditis, thus complicating diagnosis. The inflammatory landscape involves both innate and adaptive immunity, along with stromal and neuronal remodeling, contributing to arrhythmogenesis through gap junction disruption, calcium-handling abnormalities, and fibrosis. Environmental factors such as exercise, stress, and metabolic disturbances further modulate inflammatory pathways and disease expression. Therapeutically, this evolving perspective supports immunomodulatory approaches, including inhibition of NFκB, GSK3β, and cytokine signaling. Early clinical data on immunosuppressive and cytokine-directed therapies are promising, especially during active inflammatory phases, while gene-based strategies specifically address the underlying genetic defects. In conclusion, ACM should be recognized as an inflammatory cardiomyopathy shaped by interactions between genetic susceptibility and immune dysregulation. Integrating genetic and immunologic profiling may improve diagnosis, risk stratification, and treatment, ultimately leading to refined personalized therapeutic strategies. Full article
(This article belongs to the Special Issue Cellular and Molecular Mechanisms of Cardiomyopathy)
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43 pages, 41288 KB  
Article
25R-Inokosterone from Achyranthes bidentata Ameliorates Parkinson’s Disease Pathology Predominantly via Nrf2/HO-1 Activation with Coordinated MAOB/GSK-3β Expression Downregulation: An In Vitro and In Silico Study
by Ding Li, Zhi-Ye Chen, Zi-Yang Peng, Liu-Tian Fan, Li-Xia Wu, Xiu-Kun Ma and Ji-Ming Wu
Int. J. Mol. Sci. 2026, 27(10), 4204; https://doi.org/10.3390/ijms27104204 - 9 May 2026
Viewed by 523
Abstract
Neurological disorders, particularly Parkinson’s disease (PD), represent a pressing global health challenge with limited disease-modifying therapies. While Achyranthes bidentata exhibits neuroprotective potential, its bioactive constituents against PD remain poorly characterized. This study integrated phytochemical isolation and in silico target prediction to identify eight [...] Read more.
Neurological disorders, particularly Parkinson’s disease (PD), represent a pressing global health challenge with limited disease-modifying therapies. While Achyranthes bidentata exhibits neuroprotective potential, its bioactive constituents against PD remain poorly characterized. This study integrated phytochemical isolation and in silico target prediction to identify eight compounds from A. bidentata, followed by neuroprotective evaluation in 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP)-challenged SH-SY5Y cells. Among these, 25R-inokosterone significantly downregulated Monoamine oxidase B (MAOB) and Glycogen synthase kinase-3β (GSK-3β) expression and showed superior neuroprotection compared to β-ecdysterone. It markedly restored mitochondrial membrane potential, suppressed Bcl-2-associated X protein (Bax)/Cysteinyl aspartate specific proteinase 3 (caspase-3) apoptotic signaling, and alleviated oxidative stress. Mechanistically, Nuclear factor erythroid 2-related factor 2 (Nrf2)/Heme oxygenase 1 (HO-1) activation was the dominant and indispensable mechanism for neuroprotection, while MAOB/GSK-3β expression downregulation served as an upstream synergistic regulatory event, as evidenced by the abolition of neuroprotection following Nrf2 knockdown in SH-SY5Y cells. These findings identify 25R-inokosterone as a promising multi-target natural lead for PD, which exerts antioxidant and anti-apoptotic effects predominantly by activating Nrf2, accompanied by the upstream modulation of MAOB/GSK-3β expression. Full article
(This article belongs to the Section Molecular Neurobiology)
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33 pages, 7784 KB  
Article
Enriched Environment Suppresses Neuronal Ferroptosis Through SIRT1/AKT/GSK3β-Dependent Glycogen Metabolic Reprogramming After Cerebral Ischemia–Reperfusion
by Bao Zhou, Yixi Hao, Pengkun Yang, Haocheng Qin, Zheng Zhang, Na Ren, Lu Sun, Zhengran Ding, Zhong He, Shuai Zhang, Zijian Hua, Ya Zheng, Ce Li, Shenyi Kuang, Yulian Zhu and Kewei Yu
Antioxidants 2026, 15(5), 570; https://doi.org/10.3390/antiox15050570 - 30 Apr 2026
Viewed by 761
Abstract
Neuronal ferroptosis is a key contributor to secondary brain injury following cerebral ischemia, yet the metabolic mechanisms governing this process remain poorly understood. Enriched environment (EE) is a housing paradigm that provides enhanced sensory, cognitive, and social stimulation through complex physical surroundings and [...] Read more.
Neuronal ferroptosis is a key contributor to secondary brain injury following cerebral ischemia, yet the metabolic mechanisms governing this process remain poorly understood. Enriched environment (EE) is a housing paradigm that provides enhanced sensory, cognitive, and social stimulation through complex physical surroundings and increased opportunities for voluntary activity. Our preliminary data indicate that EE confers cerebroprotection against ischemia-induced ferroptosis; however, whether this effect is associated with glycogen metabolic regulation and the underlying molecular pathways has not been elucidated. This study aimed to determine whether EE may influence ferroptosis-associated pathways, potentially via Sirtuin 1 (SIRT1)/protein kinase B (AKT)/glycogen synthase kinase-3β (GSK3β)-related mechanisms of glycogen metabolism. Using a mouse model of middle cerebral artery occlusion (MCAO) and an oxygen–glucose deprivation/reoxygenation (OGD/R) cellular model, we performed behavioral assessments, molecular and biochemical analyses, and pharmacological interventions to elucidate mechanistic pathways. EE was associated with improved neurological outcomes and reduced infarct volume after ischemia. Mechanistically, EE appeared to activate the SIRT1/AKT pathway and increase the inhibitory phosphorylation of GSK3β and relieving its suppressive effect on glycogen synthase, which may underlie the observed increase in glycogen levels within ischemic brain tissue. Pharmacological inhibition of SIRT1 largely diminished these metabolic and neuroprotective benefits. Consistently, at the cellular level, SIRT1 overexpression contributed to the restoration of glycogen metabolism and robustly attenuated ferroptosis under ischemic conditions. Collectively, these findings suggest that EE may attenuate ferroptosis-related pathways possibly involving SIRT1/AKT/GSK3β-dependent glycogen metabolic remodeling, providing a novel metabolic perspective on EE-induced cerebroprotection and highlighting SIRT1-centered regulation of glycogen metabolism as a potential therapeutic target for ischemic stroke. Full article
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32 pages, 1519 KB  
Review
Pharmacological Properties and Phytochemical Profile of Sargassum filipendula Extracts
by Varun Jaiswal and Hae-Jeung Lee
Mar. Drugs 2026, 24(5), 153; https://doi.org/10.3390/md24050153 - 26 Apr 2026
Cited by 1 | Viewed by 1979
Abstract
Sargassum filipendula is a widely distributed, edible brown alga that possesses a rich nutritional profile. Several studies have demonstrated that the components/extracts of S. filipendula (SFE) possess diverse pharmacological potential against both infectious and non-infectious diseases. These include antibacterial and antifungal properties, as [...] Read more.
Sargassum filipendula is a widely distributed, edible brown alga that possesses a rich nutritional profile. Several studies have demonstrated that the components/extracts of S. filipendula (SFE) possess diverse pharmacological potential against both infectious and non-infectious diseases. These include antibacterial and antifungal properties, as well as antioxidant, anti-aging, anti-osteoporosis, antiviral, antiprotozoal, and immunomodulatory effects. Furthermore, SFE has shown significant anticancer activity across various malignant cell lines. The unique phytochemical profile of this species, characterized by the presence of sulfated polysaccharides (primarily fucoidan), carotenoids, phenols, glycolipids, and phlorotannins, serves as the foundation for these wide-ranging pharmacological activities. Studies have demonstrated that SFE can modulate key molecular targets, such as glycogen synthase kinase-3 beta, and activate the mitochondrial-dependent apoptosis pathway, providing a robust mechanistic basis for the observed pharmacological activities. Recent evaluations of nutritional parameters and techno-functional properties confirm the rich nutritional profile of S. filipendula, supporting its application in a diverse range of food products. Despite its diverse bioactive phytochemicals and broad efficacy against infectious and non-infectious diseases, research on S. filipendula remains largely restricted to in vitro preclinical studies. The lack of a comprehensive compilation of its pharmacological activities, phytochemical profiles, and molecular targets hinders its development as a therapeutic agent. This review aims to bridge this gap by compiling the existing knowledge, identifying research deficiencies, particularly the lack of in vivo data and safety assessments for high-dose therapeutic applications, while proposing suggestions for transitioning S. filipendula into a viable therapeutic or functional supplement. Full article
(This article belongs to the Section Marine Pharmacology)
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Article
Molecular Docking and Pharmacokinetic Profiling of GC-MS-Identified Phytochemicals from Peganum harmala-Derived Essential Oil: In Silico Assessment of Binding Affinity Toward PCOS-Related Targets
by Waad A. Al-Otaibi and Sahar M. AlMotwaa
Appl. Sci. 2026, 16(9), 4214; https://doi.org/10.3390/app16094214 - 25 Apr 2026
Viewed by 606
Abstract
Polycystic Ovary Syndrome (PCOS) is a prevalent endocrine disorder in women of reproductive age, characterized by hyperandrogenism, insulin resistance, and ovarian dysfunction. Current therapies are often associated with adverse effects, highlighting the need for safer therapeutic alternatives. Peganum harmala (P. harmala), [...] Read more.
Polycystic Ovary Syndrome (PCOS) is a prevalent endocrine disorder in women of reproductive age, characterized by hyperandrogenism, insulin resistance, and ovarian dysfunction. Current therapies are often associated with adverse effects, highlighting the need for safer therapeutic alternatives. Peganum harmala (P. harmala), a medicinal plant rich in bioactive metabolites, was investigated through in silico approaches to identify compounds with predicted binding affinity for the androgen receptor (AR), steroid 17α-hydroxylase/17,20-lyase (CYP17A1), and glycogen synthase kinase-3 beta (GSK-3β). GC-MS analysis of P. harmala leaf essential oil collected in Riyadh, Saudi Arabia, identified 109 compounds, with terpenoids as the dominant class (21.89%). The major constituents were cis-chrysanthenyl acetate (3.48%), cis-β-damascenone (3.06%), farnesylacetone (1.44%), β-calacorene (1.36%), dihydroedulan II (1.04%), and trans-calamenene (0.46%). In silico ADMET evaluation indicated that most compounds complied with Lipinski’s rule of five and showed favorable predicted pharmacokinetic properties. Safety profiling suggested an overall acceptable toxicity profile, with minimal predicted CYP450 inhibition, except for L11, which showed broader inhibitory potential. Molecular docking showed that L15 (trans-calamenene), L14 (dihydroedulan II), L6 (β-calacorene), L3 (farnesylacetone), and L8 exhibited higher predicted binding affinity toward the androgen receptor; L3, L10 (cis-β-damascenone), and L16 (cis-chrysanthenyl acetate) interacted with CYP17A1, while L3, L9, and L6 exhibited higher affinity toward GSK-3β. Overall, these findings provide hypothesis-generating in silico predictions of ligand–target binding affinities and drug-likeness profiles. These computational findings highlight the importance of future experimental investigations to substantiate the biological activity, pharmacokinetic behavior, and safety profile of P. harmala constituents. Full article
(This article belongs to the Section Chemical and Molecular Sciences)
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