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19 pages, 8461 KB  
Article
Mitochondria-Associated mRNAs Restore ATP During Oxidative Stress via Cytosolic Translation
by Dong-Bin Back, Gen Hamanaka, Ji-Hyun Park, Shin Ishikane, Masayoshi Tanaka, Takafumi Nakano, Yoshihiko Nakamura and Kazuhide Hayakawa
Antioxidants 2026, 15(5), 580; https://doi.org/10.3390/antiox15050580 (registering DOI) - 3 May 2026
Abstract
Mitochondrial transplantation has been proposed as a strategy to restore cellular bioenergetics after oxidative injury, but the mechanisms governing ATP recovery remain unclear. Using placental mitochondria, we examined ATP restoration following H2O2-induced oxidative stress. Unmodified mitochondria modestly increased ATP [...] Read more.
Mitochondrial transplantation has been proposed as a strategy to restore cellular bioenergetics after oxidative injury, but the mechanisms governing ATP recovery remain unclear. Using placental mitochondria, we examined ATP restoration following H2O2-induced oxidative stress. Unmodified mitochondria modestly increased ATP under baseline conditions but failed to restore ATP after injury. In contrast, lipid-coated mitochondria (MitoCoat) and lipid-encapsulated mitochondria-associated mRNAs (MitoCoat–mRNA) significantly increased ATP levels in injured cells. Transcriptomic analyses revealed that ATP recovery occurred without the normalization of canonical glycolytic or oxidative phosphorylation (OXPHOS) gene programs. Instead, unmodified mitochondria induced broad transcriptional responses associated with immune activation and cellular stress, whereas MitoCoat elicited a more restricted transcriptional profile. Notably, mitochondria-associated mRNAs alone restored ATP without detectable changes in host transcriptional programs. The removal of mitochondrial surface-associated ribosomes or the inhibition of cytosolic but not mitochondrial translation attenuated ATP recovery. The restoration of key metabolic enzymes through cytosolic translation, including PFKP, pyruvate dehydrogenase, and ATP synthase subunit ATP5A suggests that mitochondria-associated mRNAs promote recovery by re-establishing coupling between glycolysis and mitochondrial OXPHOS. Together, these findings identify encapsulated mitochondria-associated mRNAs as a potential strategy to restore cellular bioenergetics under oxidative stress. Full article
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42 pages, 2506 KB  
Review
Neurodegenerative Diseases in Children: A Comprehensive Review
by Constantin Ailioaie, Laura Marinela Ailioaie, Cristinel Ionel Stan, Anca Sava and Dragos Andrei Chiran
Int. J. Mol. Sci. 2026, 27(9), 4096; https://doi.org/10.3390/ijms27094096 (registering DOI) - 3 May 2026
Abstract
Neurodegenerative diseases (NDDs) in children represent a heterogeneous group of rare but collectively significant disorders characterized by progressive neurological decline, developmental regression, and substantial morbidity and mortality. Unlike adult-onset neurodegeneration, pediatric conditions are predominantly genetic and frequently arise from defects in fundamental cellular [...] Read more.
Neurodegenerative diseases (NDDs) in children represent a heterogeneous group of rare but collectively significant disorders characterized by progressive neurological decline, developmental regression, and substantial morbidity and mortality. Unlike adult-onset neurodegeneration, pediatric conditions are predominantly genetic and frequently arise from defects in fundamental cellular pathways, including lysosomal degradation, mitochondrial oxidative phosphorylation, peroxisomal lipid metabolism, and myelin maintenance. This comprehensive review synthesizes current knowledge regarding the epidemiology, molecular classification, pathophysiology, and emerging therapeutic strategies of major pediatric neurodegenerative disorders. Epidemiological data indicate a “rare-but-many” landscape, where individually uncommon diseases collectively impose a measurable population burden. Mechanistically, disease progression reflects converging processes such as toxic substrate accumulation, impaired autophagy–lysosome flux, mitochondrial bioenergetic failure, oxidative stress, neuroinflammation, and glial dysfunction. Representative groups discussed include lysosomal storage disorders, leukodystrophies, mitochondrial encephalopathies, peroxisomal disorders, and other monogenic neurodegenerative syndromes. Advances in next-generation sequencing, metabolic profiling, and neuroimaging have substantially improved diagnostic accuracy and enabled earlier detection, including through newborn screening programs. Therapeutic paradigms are shifting from primarily supportive care toward mechanism-based interventions, including enzyme replacement therapy, hematopoietic stem cell transplantation, substrate reduction strategies, and gene therapy approaches. Early molecular diagnosis is increasingly recognized as critical for optimizing outcomes, particularly in disorders amenable to presymptomatic intervention. Continued integration of genomic medicine, standardized epidemiologic surveillance, and translational research will be essential to refine disease classification, improve prognostication, and expand access to targeted therapies. Collectively, pediatric neurodegenerative diseases exemplify the intersection of developmental neurobiology and inherited metabolic dysfunction, underscoring the need for multidisciplinary, precision-based clinical strategies. Full article
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28 pages, 4140 KB  
Review
Beyond ATP: Lipid-Driven Plasticity and the Immunometabolism of ILC2s
by Vanessa-Vivien Pesold, Jafar Cain, Steven J. Bensinger and Omid Akbari
Cells 2026, 15(9), 838; https://doi.org/10.3390/cells15090838 (registering DOI) - 3 May 2026
Abstract
Group 2 innate lymphoid cells (ILC2s) are tissue-resident immune cells that play a central role in type 2 immunity. Beyond cytokine signaling, they integrate inputs from lipids, nutrients, neuroendocrine mediators, and local metabolic cues, establishing cellular metabolism as a key regulator of their [...] Read more.
Group 2 innate lymphoid cells (ILC2s) are tissue-resident immune cells that play a central role in type 2 immunity. Beyond cytokine signaling, they integrate inputs from lipids, nutrients, neuroendocrine mediators, and local metabolic cues, establishing cellular metabolism as a key regulator of their function. Immunometabolism provides a framework to understand how ILC2s adapt to diverse tissue environments such as the lung, adipose tissue, gut, skin, and brain, each defined by distinct nutrient availability, oxygen tension, and inflammatory conditions. Unlike many immune cells that primarily rely on glycolysis, ILC2s dynamically balance glycolysis, fatty acid oxidation (FAO), and oxidative phosphorylation (OXPHOS) depending on activation state and tissue context. Lipids not only serve as energy substrates but also regulate membrane organization, lipid raft–dependent signaling, and the generation of bioactive mediators, including eicosanoids, oxysterols, and sphingolipids. Emerging evidence linking cholesterol biosynthesis, steroid metabolism, and sphingolipid signaling to ILC2 function underscores the importance of lipid-dependent immune regulation. Dysregulation of these pathways contributes to chronic inflammatory diseases such as asthma, metabolic disorders, and fibrosis. Targeting metabolic pathways and checkpoints may therefore offer new strategies to modulate ILC2-driven pathology. This review summarizes current insights into metabolic programs governing ILC2 activation, survival, and plasticity and highlights emerging therapeutic opportunities. Full article
(This article belongs to the Special Issue Multifaceted Nature of Immune Responses to Viral Infection)
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17 pages, 11682 KB  
Article
Supercritical CO2-Derived Tomato Extract Activates Signaling Pathways to Reduce Oxidative Stress and Inflammation in Astrocyte Cells
by Serena Recalchi, Beatrice Mengoni, Barbara Scaglia, Marilena Esposito, Emiliano Montalesi, Valeria Manganelli, Gloria Riitano, Elena Fasciolo, Tuba Rana Caglar, Daniela Caissutti, Camilla Moliterni, Federica Armeli, Rita Businaro, Roberta Misasi, Maurizio Sorice and Antonella Capozzi
Nutrients 2026, 18(9), 1464; https://doi.org/10.3390/nu18091464 (registering DOI) - 3 May 2026
Abstract
Background/Objectives: In this study, we investigated the effect on antioxidant defenses of a tomato extract obtained by supercritical CO2 extraction (sCO2TE), evaluating whether this green extraction method preserves biological activity compared to a conventional tomato extract (CTE) and focusing on [...] Read more.
Background/Objectives: In this study, we investigated the effect on antioxidant defenses of a tomato extract obtained by supercritical CO2 extraction (sCO2TE), evaluating whether this green extraction method preserves biological activity compared to a conventional tomato extract (CTE) and focusing on superoxide dismutase (SOD) and glutathione peroxidase (GPx) regulation, Nuclear factor erythroid 2-related factor 2 (NRF2) activation, reactive oxygen species (ROS) and lipid peroxidation modulation. Methods: Human glioblastoma astrocytoma U-373 cells were pre-treated with sCO2TE or conventional tomato extract (CTE) and subsequently exposed to sodium arsenite (AsNaO2) to induce oxidative stress, or lipopolysaccharide (LPS) to trigger inflammatory signaling. Cell viability was assessed by Trypan Blue and MTT [3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide]; cell toxicity by propidium iodide staining. Intracellular ROS and lipid peroxidation were measured by flow cytometry. Gene expression of NRF2, SOD1 and GPX1 was analyzed by qRT-PCR, NRF2 activation and modulation of ERK1/2 (Extracellular Signal-Regulated Kinase 1/2) and NF-κB (Nuclear Factor kappa-light-chain-enhancer of activated B cells) were evaluated by Western blot. Results: Pre-treatment with sCO2TE significantly reduced AsNaO2-induced ROS production and lipid peroxidation, showing a stronger effect compared to CTE. sCO2TE enhanced the expression of NRF2 phosphorylation and its downstream targets SOD1 and GPX1, particularly under oxidative stress conditions. In addition, sCO2TE attenuated LPS-induced phosphorylation of ERK1/2 and NF-κB p65, suggesting anti-inflammatory activity. Conclusions: These findings demonstrate that sCO2TE preserves the antioxidant and anti-inflammatory properties of tomato-derived bioactives. The comparable efficacy of sCO2TE and CTE supports the use of sCO2 as a sustainable and solvent-free extraction method for the development of nutraceutical formulations targeting oxidative stress and neuroinflammation. Full article
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25 pages, 983 KB  
Article
Allosteric Activation of GDH/TCA Pathway Reduces Pathological Build-Up and Promotes Neuronal Survival in an In Vitro Model of Alzheimer’s Disease
by Tiziano Serfilippi, Silvia Piccirillo, Alessandra Preziuso, Valentina Terenzi, Raffaella Ciancio, Simona Magi, Vincenzo Lariccia and Agnese Secondo
Biomolecules 2026, 16(5), 667; https://doi.org/10.3390/biom16050667 - 30 Apr 2026
Viewed by 19
Abstract
Mitochondrial dysfunction is a relevant hallmark of Alzheimer’s disease (AD), contributing to the impaired metabolic homeostasis involved in neuronal loss and cognitive decline. In this study, we target the metabolic dysfunction occurring in AD through a novel pharmacological approach involving the modulation of [...] Read more.
Mitochondrial dysfunction is a relevant hallmark of Alzheimer’s disease (AD), contributing to the impaired metabolic homeostasis involved in neuronal loss and cognitive decline. In this study, we target the metabolic dysfunction occurring in AD through a novel pharmacological approach involving the modulation of glutamate dehydrogenase (GDH), which converts glutamate to α-ketoglutarate and supports the tricarboxylic acid (TCA) cycle. In our experimental models (i.e., differentiated SH-SY5Y cells and primary rat cortical neurons exposed to glyceraldehyde and amyloid-beta peptide 1-42, respectively), the allosteric GDH activator 2-Aminobicyclo-(2,2,1)-heptane-2-carboxylic acid (BCH) increased mitochondrial ATP production, improved cellular bioenergetics, and reduced oxidative stress, ultimately promoting neuronal survival. Ionic dysfunctions in AD are linked to disrupted calcium homeostasis and organelle storing properties. In this context, GDH activation potentiated mitochondrial and endoplasmic reticulum calcium buffering capacity by enhancing store-operated calcium entry. Oxidative stress, largely driven by mitochondrial ROS overproduction, represents another major contributor to AD pathology. In our AD models BCH-mediated GDH activation reduced ROS formation and restored mitochondrial membrane potential (ΔΨm). Importantly, these metabolic and ionic improvements were associated with decreased accumulation of amyloid-β (Aβ1-42) and phosphorylated tau (pTau), two key AD biomarkers. Overall, modulation of the GDH/TCA pathway represents a promising approach for restoring metabolic dysfunctions and counteracting oxidative stress and ionic dysregulation and therefore AD neurodegeneration. Full article
(This article belongs to the Special Issue Tissue-Specific Organelle Dynamics)
20 pages, 4891 KB  
Article
Dissection of Genotype-Dependent Responses Reveals Leaf Proteome Signatures Associated with Maize Thermotolerance During Flowering Under Enclosure-Imposed Heat Stress
by Ruixiang Liu, Xiaohang Li, Zixin Zha, Meijing Zhang, Lingjie Kong, Yakun Cui, Wenming Zhao, Qingchang Meng, Youhua Wang and Yanping Chen
Proteomes 2026, 14(2), 23; https://doi.org/10.3390/proteomes14020023 - 29 Apr 2026
Viewed by 136
Abstract
Background: During maize anthesis, heat stress severely limits productivity—particularly under humid conditions where high humidity suppresses transpirational cooling, forcing tissues to endure direct thermal load. Methods: Using field enclosures to impose enclosure-imposed humid heat shock (EHS), we screened 135 maize inbred lines for [...] Read more.
Background: During maize anthesis, heat stress severely limits productivity—particularly under humid conditions where high humidity suppresses transpirational cooling, forcing tissues to endure direct thermal load. Methods: Using field enclosures to impose enclosure-imposed humid heat shock (EHS), we screened 135 maize inbred lines for flowering-stage yield resilience, using grain weight per ear at maturity under EHS relative to the corresponding control (CK) condition as the primary selection criterion. Based on this screen, we selected two tolerant (R025, R100) and two sensitive (R133, R135) genotypes for data-independent acquisition mass spectrometry (DIA-MS) profiling of the tassel-subtending leaf. Results: At baseline, the selected tolerant lines exhibited a constitutively distinct proteomic state, including lower abundance of light-harvesting complex components and higher abundance or detection frequency of several regulatory proteins, including SRK2E/OST1 and HSF-B2a. Under sustained EHS, the selected sensitive lines showed extensive proteomic disruption, including reduced abundance of photosynthesis-related proteins and oxidative phosphorylation, together with increased abundance of proteins associated with endoplasmic reticulum stress responses and protein turnover. In contrast, the selected tolerant lines displayed a more constrained acclimation response, characterized by relative maintenance of photosynthesis-related proteins together with selective increases in chaperone systems (HSP90/sHSPs) and benzoxazinoid biosynthesis-related proteins. Several proteins showed switch-like detection patterns between the selected tolerant and sensitive lines, including TMEM97-like and a peptidyl-prolyl isomerase, indicating potentially distinct regulatory states. Conclusions: These findings suggest that tolerant performance under enclosure-imposed heat stress is associated with a pre-conditioned proteomic state and enhanced protein homeostasis (proteostasis) buffering capacity that may help preserve photosynthetic function during flowering-stage stress. The identified proteins should be regarded as candidate markers requiring further functional validation before any application in breeding programs aimed at improving adaptation to increasingly frequent heat-stress events. Full article
(This article belongs to the Special Issue Plant Genomics and Proteomics)
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16 pages, 2663 KB  
Article
Transcriptome–Metabolome Combined Analysis of Central Carbon Metabolites in Anoectochilus roxburghii (Wall.) Lindl. Under Salt Stress
by Heping Li, Fangzhou Zhao, Huiming Huang, Shuhe Zhang, Jiangbo Lin, Debao Huang and Yimin Dai
Genes 2026, 17(5), 523; https://doi.org/10.3390/genes17050523 - 29 Apr 2026
Viewed by 144
Abstract
Background: Anoectochilus roxburghii (Wall.) Lindl. is an endangered medicinal herb, and salt stress has been reported to promote the accumulation of bioactive secondary metabolites. Central carbon metabolism plays a key role in carbon allocation in plants; however, the integrated molecular and metabolic [...] Read more.
Background: Anoectochilus roxburghii (Wall.) Lindl. is an endangered medicinal herb, and salt stress has been reported to promote the accumulation of bioactive secondary metabolites. Central carbon metabolism plays a key role in carbon allocation in plants; however, the integrated molecular and metabolic responses of A. roxburghii to salt stress remain largely unclear. Method: In this study, an integrated transcriptomic and metabolomic approach was employed to investigate the reprogramming of central carbon metabolism in A. roxburghii under 50, 100, and 200 mM NaCl treatments. Results: Metabolomic analysis revealed a significant accumulation of soluble sugars, which suggests enhanced osmotic adjustment and alteration in energy metabolism. Transcriptomic profiling identified 7019 upregulated and 5192 downregulated DEGs, with pathways related to the TCA cycle, galactose metabolism, and fructose/mannose metabolism predominantly upregulated, while oxidative phosphorylation was suppressed. Integrative transcriptome–metabolome profiling further identified key genes associated with oxaloacetate and fructose-6-phosphate, suggesting a coordinated regulation between central carbon metabolism and polysaccharide biosynthesis. Conclusions: Collectively, these findings demonstrate that salt stress induces coordinated metabolic and transcriptional reprogramming in A. roxburghii, driving carbon flux reallocation from growth-related processes toward osmoprotective metabolism. This provides a mechanistic basis for the enhancement of bioactive compounds under moderate stress and offers insights for improving both salt tolerance and medicinal quality in saline environments. Full article
(This article belongs to the Special Issue Physiological and Molecular Mechanisms of Plant Stress Response)
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19 pages, 783 KB  
Review
Long-Chain Fatty Acids as Drivers of Neuroinflammation in Neurodegeneration: Mechanistic Links to Lipid Peroxidation, Ferroptosis, and Mitochondrial Dysfunction
by Rafail C. Christodoulou, Laura Lorentzen, Daniel Eller and Evros Vassiliou
Nutrients 2026, 18(9), 1392; https://doi.org/10.3390/nu18091392 - 28 Apr 2026
Viewed by 144
Abstract
Background: Neurodegenerative diseases (NDs) are mainly considered disorders marked by severe immunometabolic imbalance, characterized by ongoing neuroinflammation and glial activation. While mitochondrial dysfunction and oxidative stress are well-known features, the upstream metabolic factors linking these pathological processes remain poorly understood. Methods: In this [...] Read more.
Background: Neurodegenerative diseases (NDs) are mainly considered disorders marked by severe immunometabolic imbalance, characterized by ongoing neuroinflammation and glial activation. While mitochondrial dysfunction and oxidative stress are well-known features, the upstream metabolic factors linking these pathological processes remain poorly understood. Methods: In this review, we examined recent preclinical and clinical studies exploring the connections between lipid metabolism, glial immunometabolism, and regulated cell death pathways. Our focus was on how long-chain fatty acids (LCFAs) facilitate communication among mitochondria, reactive oxygen species (ROS), and ferroptosis in Alzheimer’s disease (AD), Parkinson’s disease (PD), and amyotrophic lateral sclerosis (ALS). Results: New evidence shifts LCFAs from merely being passive indicators of cellular damage to active, upstream regulators of the neuroimmune response. Existing research shows that excess LCFA intake can overload astrocytic mitochondrial oxidative phosphorylation, leading to abnormal lipid droplet buildup and reactive astrogliosis. This lipid-driven reactivity promotes microglial polarization toward a persistent pro-inflammatory state. Notably, high levels of specific LCFAs, especially arachidonic acid, increase ROS production and lipid peroxidation. This lipotoxic environment ultimately triggers ferroptosis, an iron-dependent form of cell death shared across multiple NDs. Conclusions: The harmful interaction among mitochondrial dysfunction, lipid peroxidation, and ferroptosis is driven by an imbalance in LCFA levels. Addressing current challenges, such as the complex effects of polyunsaturated fatty acid supplementation, requires advanced techniques like single-cell multi-omics and artificial intelligence. Understanding this intricate lipidomic-transcriptomic crosstalk is crucial for moving toward personalized neuroimmunometabolism and developing new treatments to prevent ferroptosis. Full article
(This article belongs to the Section Nutrition and Neuro Sciences)
34 pages, 3713 KB  
Article
Fucosylation Dynamics as a Critical Determinant of Cancer Cell Fate in Colorectal Carcinoma: Integrating Hallmark Plasticity, Microenvironmental Remodelling, and Therapeutic Resistance
by Abdulaziz Alfahed, Abdulrahman A. Alahmari and Glowi Alasiri
Biology 2026, 15(9), 689; https://doi.org/10.3390/biology15090689 - 28 Apr 2026
Viewed by 289
Abstract
Fucosylation, the enzymatic addition of fucose residues to glycans, modulates receptor signalling and cellular identity in the intestinal epithelium. Its role as an integrative determinant of cancer cell fate in colorectal cancer (CRC) remains undefined. Transcriptomic and clinicopathological data from 976 CRC patients [...] Read more.
Fucosylation, the enzymatic addition of fucose residues to glycans, modulates receptor signalling and cellular identity in the intestinal epithelium. Its role as an integrative determinant of cancer cell fate in colorectal cancer (CRC) remains undefined. Transcriptomic and clinicopathological data from 976 CRC patients across three independent cohorts (TCGA-CRC, CPTAC2-CRC, Sidra-LUMC) were analysed. A curated fucosylation gene set was used to calculate tumour fucosylation scores. Associations with histogenetic status, genomic features, microenvironmental phenotypes, drug resistance programmes, and survival were evaluated using gene set enrichment analysis, multivariable Cox regression, and integrated molecular subtyping. High-fucosylation tumours exhibited elevated epithelial differentiation, MSI-H/BRAF-mutant enrichment, oxidative phosphorylation dominance, the complete absence of EMT and invasion programmes, and favourable prognosis (HR = 0.633, 95% CI: 0.470–0.853, p = 0.003). Low-fucosylation tumours demonstrated mesenchymal phenotypes, TP53 mutations, chromosomal instability, comprehensive multi-family RTK signalling, immune-excluded microenvironments, and poor outcomes. Distinct multidrug resistance programmes emerged: drug efflux in low-fucosylation tumours versus xenobiotic sensing, target bypass, and drug sequestration in high-fucosylation tumours. Tumour fucosylation status defines two fundamentally distinct CRC cell states with mutually exclusive engagement of invasion programmes, metabolic pathways, immune phenotypes, and resistance mechanisms. Fucosylation represents an independent prognostic biomarker and integrative determinant of cancer cell fate, with significant implications for risk stratification and personalised therapeutic strategies. Full article
(This article belongs to the Special Issue Signaling Mechanisms Controlling Cell Fate in Cancer)
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18 pages, 777 KB  
Review
Immunometabolism in Cardiac Remodeling: Mechanisms and Therapeutic Perspectives
by Julia Nazaruk, Barbara Bilnik, Maciej Niewiadomski, Wojciech Pawlak and Piotr Gajewski
Int. J. Mol. Sci. 2026, 27(9), 3906; https://doi.org/10.3390/ijms27093906 - 28 Apr 2026
Viewed by 145
Abstract
Cardiovascular diseases remain the leading cause of mortality worldwide, and one of the key mechanisms driving the development of heart failure is pathological remodeling of the myocardium. This process involves complex structural, cellular, and metabolic alterations in which the immune system and its [...] Read more.
Cardiovascular diseases remain the leading cause of mortality worldwide, and one of the key mechanisms driving the development of heart failure is pathological remodeling of the myocardium. This process involves complex structural, cellular, and metabolic alterations in which the immune system and its interactions with cardiomyocytes and fibroblasts play a central role. The aim of this work was to present the current state of knowledge on immunometabolism in cardiac remodeling and to discuss its pathophysiological relevance and therapeutic potential. This review focuses on the metabolism of cardiac macrophages, highlighting the differences between the pro-inflammatory (M1) and reparative (M2) phenotypes and their impact on inflammation, fibrosis, and myocardial regeneration. The roles of major metabolic pathways, including glycolysis, oxidative phosphorylation, fatty acid oxidation, and glutaminolysis, are discussed, as well as the importance of the NLRP3 inflammasome and efferocytosis in regulating the inflammatory response. Furthermore, the review briefly incorporates recent insights into neutrophil, T cell, and regulatory T cell (Treg) metabolism and their contributions to inflammation, repair, and fibrotic remodeling. Particular attention is also given to cardiac fibroblasts and their metabolic reprogramming during fibrosis, with emphasis on the pivotal role of transforming growth factor-β (TGF-β) signaling. The review further discusses the role of microRNAs as mediators of intercellular communication integrating immunological and metabolic signals. The work is complemented by a discussion of therapeutic perspectives, including modulation of macrophage metabolism, fibrogenic signaling pathways, mitochondrial function, and miRNA-based therapies. Immunometabolism emerges as a promising research field whose further exploration may contribute to the development of novel, more precise strategies for the treatment of cardiovascular diseases. Full article
(This article belongs to the Special Issue Molecular Mechanism in Cardiac Remodeling)
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19 pages, 4447 KB  
Article
Transcriptomic Analysis of Organotypic Porcine Retina Cultures
by Siavash Khosravi, Grazia Giorgio, Federica Staurenghi, Tanja Schoenberger, Peter Gross, Margit Ried, Julia Frankenhauser, Sebastian Eder, Elke Markert, Remko A. Bakker, Sepideh Babaei and Nina Zippel
Int. J. Mol. Sci. 2026, 27(9), 3901; https://doi.org/10.3390/ijms27093901 - 28 Apr 2026
Viewed by 110
Abstract
Porcine organotypic retinal explant cultures are widely used to study retinal neurodegeneration under controlled conditions, but the biological processes that occur in the retinal explant over time due to preparation-induced injury and culture are not well understood. Here, we generated a time-resolved transcriptomic [...] Read more.
Porcine organotypic retinal explant cultures are widely used to study retinal neurodegeneration under controlled conditions, but the biological processes that occur in the retinal explant over time due to preparation-induced injury and culture are not well understood. Here, we generated a time-resolved transcriptomic reference for porcine neural retinal explants, which were maintained ex vivo for 10 days. Global expression profiles are strongly separated by culture time, with Day 0 clearly distinct from cultured samples and Day 7 and Day 10 showing the highest similarity, indicating a transition toward a later stabilized state. Across the time course, 3187 genes were differentially expressed relative to Day 0, with the largest shifts occurring at an early stage of culture (Day 1–Day 3). Pathway-level analyses revealed coordinated remodeling involving inflammatory signaling and metabolic/bioenergetic changes, including reduced mitochondrial and oxidative phosphorylation-related programs at later time points. Here, we provide a time-resolved transcriptomics reference dataset for cultured porcine retinal explants. These data can build a foundation to interpret data generated in this model, differentiate changes inherent to the explant culture from treatment-specific effects and select appropriate experimental windows for mechanistic studies of retinal degeneration. Full article
(This article belongs to the Special Issue Molecular Advances in Retinal Degeneration)
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25 pages, 4630 KB  
Article
Multi-Omics Integration Identifies a Six-Gene Diagnostic Signature for Ankylosing Spondylitis via Metabolic–Immune Crosstalk
by Xuejian Dan, Xiangyuan Guan, Hangjian Hu, Wei Liu, Zhourui Wu, Xiao Hu, Wei Xu, Yunfei Zhao and Bin Ma
Int. J. Mol. Sci. 2026, 27(9), 3860; https://doi.org/10.3390/ijms27093860 - 27 Apr 2026
Viewed by 219
Abstract
Ankylosing spondylitis (AS) is a chronic immune-mediated inflammatory disease affecting the axial skeleton, characterized by progressive structural damage and functional impairment. Although biologic therapies targeting tumor necrosis factor and interleukin-17 have improved clinical outcomes, a substantial proportion of patients fail to achieve sustained [...] Read more.
Ankylosing spondylitis (AS) is a chronic immune-mediated inflammatory disease affecting the axial skeleton, characterized by progressive structural damage and functional impairment. Although biologic therapies targeting tumor necrosis factor and interleukin-17 have improved clinical outcomes, a substantial proportion of patients fail to achieve sustained disease control. Emerging evidence suggests that metabolic alterations may contribute to AS pathogenesis; however, systematic characterization of metabolism-related biomarkers and their regulatory networks remains limited, and the interplay between metabolic dysfunction and immune dysregulation in AS is poorly understood. Two whole-blood GEO datasets (GSE25101, GSE73754; n = 104) were integrated as the primary analytical cohort. A third dataset (GSE11886, n = 18; monocyte-derived macrophages) was included for exploratory cross-tissue analysis. Differential expression analysis identified 847 DEGs, which were refined to 16 metabolism-related genes through weighted gene co-expression network analysis (WGCNA) and GeneCards database filtering. Eleven machine learning algorithms with 5-fold cross-validation were applied to construct diagnostic models and identify hub genes. Validation analyses included immune cell infiltration estimation using CIBERSORT, metabolic pathway activity assessment via ssGSEA, single-cell transcriptomics from GSE268839, functional enrichment through GSEA/GSVA, and chromosomal localization analysis. A competing endogenous RNA (ceRNA) regulatory network was constructed to map post-transcriptional regulation. Natural compounds from 66 AS-treating traditional Chinese medicines were screened against hub genes using deep learning-based binding prediction. Multiple machine learning algorithms achieved comparable cross-validated performance (CV AUC range 0.741–0.836; top five models: 0.805–0.836) using the six hub genes (MFN2, SLC27A3, RHOB, SMG7, AKR1B1, LCOR) identified through SHAP-based feature importance analysis of the PLS model. Leave-one-dataset-out validation between the two whole-blood cohorts showed that all algorithms exceeded an AUC of 0.77 in Round 1 (validate: GSE73754, n = 72; best AUC 0.861), while Round 2 (validate: GSE25101, n = 32) yielded more modest performance (best AUC, 0.715) reflecting the smaller validation sample. Exploratory application to GSE11886 (macrophage-derived samples) showed near-chance performance, consistent with the tissue-source discrepancy. AS patients exhibited significant downregulation of oxidative phosphorylation, TCA cycle, and glycolysis pathways (p < 0.01), accompanied by elevated glutathione metabolism (p < 0.001). Immune cell deconvolution revealed reduced CD8+ T cell proportions correlating with MFN2 downregulation, and increased neutrophil frequencies correlating with SLC27A3 upregulation. Exploratory single-cell analysis indicated that RHOB expression was relatively enriched in border-associated macrophages and fibroblasts, while AKR1B1 was more prominently expressed in vascular endothelial cells and plasmacytoid dendritic cells. The ceRNA network identified 21 miRNAs and 65 lncRNAs forming 86 regulatory interactions, with four key regulatory axes (SATB1-AS1/miR-539-5p/LCOR, FAM95B1/miR-223-3p/RHOB, LINC01106/miR-106a-5p/MFN2, AATBC/miR-185-5p/SMG7) predicted to regulate hub gene expression. Compound screening identified betaine, pyruvic acid, citric acid, etc., as top-ranking candidates, with MFN2 showing the highest binding capacity among hub genes. This study provides an integrative framework linking metabolic reprogramming with immune dysfunction in AS. The six-gene diagnostic signature showed preliminary discriminatory ability in the available datasets, while the ceRNA regulatory network and natural compound screening results prioritize candidate regulatory pathways and compounds for future validation. These findings advance our understanding of AS pathogenesis and may guide future biomarker development and targeted intervention strategies. Full article
(This article belongs to the Section Molecular Pathology, Diagnostics, and Therapeutics)
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20 pages, 9647 KB  
Article
CCL2 and PAK6 as Candidate Biomarkers of Neuroinflammation in Parkinson’s Disease: An Integrated Machine Learning and Single-Nucleus Transcriptomic Study
by Qixin Zhu, Zhen Zhang, Leiming Zhang, Qian Li, Ting Zhang and Fei Yang
Brain Sci. 2026, 16(5), 463; https://doi.org/10.3390/brainsci16050463 - 25 Apr 2026
Viewed by 178
Abstract
Background: Neuroinflammation is recognized as a key contributor to Parkinson’s disease (PD), but the relationships between inflammatory signaling, immune-state alterations, and cell-type-specific transcriptional programs remain unclear. Methods: Public transcriptomic datasets, including GSE20141 (discovery cohort) and the substantia nigra subset of GSE114517 (external validation [...] Read more.
Background: Neuroinflammation is recognized as a key contributor to Parkinson’s disease (PD), but the relationships between inflammatory signaling, immune-state alterations, and cell-type-specific transcriptional programs remain unclear. Methods: Public transcriptomic datasets, including GSE20141 (discovery cohort) and the substantia nigra subset of GSE114517 (external validation cohort), were analyzed. Genes identified by exploratory differential-expression screening in the discovery cohort were intersected with predefined inflammation- and chemokine-related gene sets to define a candidate space for downstream prioritization. Protein–protein interaction, Gene Ontology, KEGG, and immune-signature analyses were performed, followed by machine learning-based feature prioritization using Elastic Net, support vector machine-recursive feature elimination, and random forest. Prioritized candidates were further evaluated by cross-platform validation, single-nucleus transcriptomic mapping, and a hypothesis-generating in silico perturbation analysis in PD astrocytes. Results: Seventeen genes were retained at the intersection of PD-related differentially expressed genes and inflammation-/chemokine-associated gene sets. These candidates formed a response module enriched in mitochondrial organization, oxidative phosphorylation, and mitophagy pathways. Immune-signature analysis suggested an altered transcriptome-derived immune landscape in PD, with changes in NK cell-related signatures and significant correlations between immune-state scores and the candidate genes. Machine learning-based prioritization yielded five shared candidates, of which only CCL2 and PAK6 showed same-direction support with nominal significance in the external validation cohort. Single-nucleus transcriptomic analysis localized CCL2 predominantly to astrocytes, whereas PAK6 was more strongly associated with neuronal populations, particularly OTX2-positive ventral midbrain neurons. In silico perturbation analysis further predicted that CCL2 suppression in PD astrocytes may be associated with translational- and ribosome-related regulatory programs. Conclusions: CCL2 and PAK6 emerged as prioritized candidate biomarkers associated with PD-related inflammatory and chemokine-linked transcriptional alterations in the substantia nigra. More broadly, this study provides a multi-layered framework for candidate prioritization, cross-platform validation, and cell-type-level contextualization in PD neuroinflammation. Because the study is computational and the perturbation analysis is predictive, orthogonal experimental validation will be required to determine whether CCL2 and PAK6 are biomarkers of disease-associated transcriptional states, functional contributors to PD pathogenesis, or both. Full article
(This article belongs to the Section Neurodegenerative Diseases)
17 pages, 1226 KB  
Article
5-ALA/SFC Mitigates Tau Toxicity via Lowering Oxidative Stress in a Drosophila Model of Tau Toxicity
by Arisa Tamura, Marie Noguchi, Naoko Nozawa, Emiko Suzuki and Kanae Ando
Life 2026, 16(5), 725; https://doi.org/10.3390/life16050725 - 24 Apr 2026
Viewed by 306
Abstract
Mitochondrial dysfunctions contribute to the pathogenesis of tauopathies, a group of neurodegenerative diseases with abnormal accumulation of microtubule-associated protein tau. The combination of 5-aminolevulinic acid (5-ALA) and sodium ferrous citrate (SFC) is known to improve mitochondrial functions. Here, we report that 5-ALA combined [...] Read more.
Mitochondrial dysfunctions contribute to the pathogenesis of tauopathies, a group of neurodegenerative diseases with abnormal accumulation of microtubule-associated protein tau. The combination of 5-aminolevulinic acid (5-ALA) and sodium ferrous citrate (SFC) is known to improve mitochondrial functions. Here, we report that 5-ALA combined with SFC (5-ALA/SFC) improves mitochondrial functions and mitigates neurodegeneration in transgenic Drosophila expressing human tau. We found that tau reduces ATP levels, decreases mitochondrial distribution to neurites, and increases mitochondrial reactive oxygen species (ROS). Expression of oxidative phosphorylation (OXPHOS) genes was upregulated, and activities of complexes I and IV were elevated. Feeding 5-ALA/SFC to tau flies lowers oxidative damage without correcting OXPHOS activities or mitochondrial distribution. 5-ALA/SFC treatment suppressed pathological tau phosphorylation and mitigated tau-induced neurodegeneration. These results suggest that 5-ALA/SFC attenuates a neurodegenerative pathway involving tau, mitochondria, and ROS. Full article
30 pages, 7083 KB  
Article
Network Pharmacology and Molecular Docking-Based Investigation of Empagliflozin’s Therapeutic Potential in Chronic Kidney Disease
by Aman Tedasen, Moragot Chatatikun, Ratana Netphakdee, Jason C. Huang and Atthaphong Phongphithakchai
Life 2026, 16(5), 719; https://doi.org/10.3390/life16050719 - 23 Apr 2026
Viewed by 316
Abstract
Chronic kidney disease (CKD) is a progressive global health challenge. While empagliflozin, a selective SGLT2 inhibitor, is known to attenuate CKD progression through mechanisms beyond glycemic control, the precise molecular pathways remain incompletely characterized and warrant further investigation. This study employed an integrated [...] Read more.
Chronic kidney disease (CKD) is a progressive global health challenge. While empagliflozin, a selective SGLT2 inhibitor, is known to attenuate CKD progression through mechanisms beyond glycemic control, the precise molecular pathways remain incompletely characterized and warrant further investigation. This study employed an integrated network pharmacology and molecular docking approach to elucidate the multi-target mechanisms of empagliflozin in CKD. Initial evaluation demonstrated that empagliflozin exhibits favorable physicochemical properties, drug-likeness, and ADMET profiles, supporting its potential as an effective orally administered therapeutic option for CKD management. Network analysis identified 221 shared molecular targets between empagliflozin and CKD-associated genes. Topological analysis of the protein–protein interaction (PPI) network revealed ten critical hub proteins—GAPDH, IL6, EGFR, HSP90AA1, NFKB1, HSP90AB1, MTOR, MAPK3, IL2, and PIK3CA—which serve as key regulators in CKD pathophysiology. Gene Ontology and KEGG pathway enrichment analyses indicated that these shared targets are significantly involved in phosphorylation, signal transduction, and central signaling cascades associated with CKD progression, including the PI3K-Akt, FoxO, HIF-1, and AGE-RAGE pathways. Molecular docking simulations corroborated empagliflozin’s multi-target affinity, demonstrating particularly strong binding energies toward HSP90AB1 (−10.85 kcal/mol), MAPK3 (−9.46 kcal/mol), and EGFR (−9.38 kcal/mol). Empagliflozin maintained stable hydrogen bonding throughout the 200-ns molecular dynamics simulation, primarily with GLN18, GLU42, SER45, ASN46, ASN101, GLY130, and TYR134, underscoring its persistent and well-anchored interaction with HSP90AB1. Collectively, these findings provide crucial mechanistic insights, suggesting that empagliflozin might exerts therapeutic effects by modulating interconnected pathways regulating inflammation, oxidative stress, and metabolic homeostasis, thereby reinforcing its role as a comprehensive, multi-target therapeutic strategy for CKD management. Nonetheless, validation through in vitro experiments remains necessary. Full article
(This article belongs to the Special Issue Pathogenesis and Novel Treatment for Kidney Diseases)
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