{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T23:40:51Z","timestamp":1790293251327,"version":"4.1.0"},"reference-count":209,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2026,7,20]],"date-time":"2026-07-20T00:00:00Z","timestamp":1784505600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Antioxidants"],"abstract":"<jats:p>Redox homeostasis is essential for intestinal and systemic health and is regulated by antioxidant defense systems and redox-sensitive signaling pathways such as the nuclear factor erythroid 2-related factor 2 (Nrf2) and the nuclear factor \u2018kappa-light-chain-enhancer\u2019 of activated B-cells (NF-\u03baB). Disturbances in this balance promote oxidative stress, chronic inflammation, and disease progression. Increasing evidence indicates that microbiota-derived metabolites act as key modulators of redox biology by shaping host gene expression through receptor-mediated signaling, metabolic regulation, and chromatin-associated mechanisms, including histone modifications, DNA methylation, and changes in chromatin accessibility. This review discusses how major classes of microbiota-derived and microbiota-modulated metabolites, including short-chain fatty acids (SCFAs), secondary bile acids, tryptophan-derived metabolites, polyphenol metabolites, hydrogen sulfide, and lipid mediators, influence redox-sensitive signaling and epigenetic regulation. We highlight their effects on intestinal barrier integrity and immune cell function, with particular emphasis on macrophage polarization and T-cell differentiation. Finally, we consider the emerging translational relevance of the microbiota\u2013metabolite\u2013epigenetic axis, while emphasizing that biomarker development and therapeutic applications require further mechanistic validation and clinical studies.<\/jats:p>","DOI":"10.3390\/antiox15070897","type":"journal-article","created":{"date-parts":[[2026,7,20]],"date-time":"2026-07-20T12:00:17Z","timestamp":1784548817000},"page":"897","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Microbiota-Derived Metabolites in the Epigenetic Regulation of Redox Homeostasis"],"prefix":"10.3390","volume":"15","author":[{"given":"Patricia","family":"Mester","sequence":"first","affiliation":[{"name":"Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, Immunology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9284-1138","authenticated-orcid":false,"given":"Sara Martina","family":"Steinmann","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, Immunology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Simon","family":"Mehler","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, Immunology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8520-4568","authenticated-orcid":false,"given":"Martina","family":"M\u00fcller","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, Immunology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-2897-3447","authenticated-orcid":false,"given":"Karsten","family":"G\u00fclow","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine I, Gastroenterology, Hepatology, Endocrinology, Rheumatology, Immunology, and Infectious Diseases, University Hospital Regensburg, 93053 Regensburg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"2369","DOI":"10.1056\/NEJMra1600266","article-title":"The Human Intestinal Microbiome in Health and Disease","volume":"375","author":"Lynch","year":"2016","journal-title":"N. 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