Dr. Umar

This review explains how inflammation drives anemia via hepcidin-mediated iron sequestration, impaired iron absorption, and suppressed erythropoiesis, framing AI as “nutritional immunity.” It highlights diagnostic pitfalls with coexisting iron deficiency and summarizes current and emerging hepcidin-targeted treatments.

This minireview synthesizes how gut dysbiosis and hepcidin-driven iron mismanagement reinforce hepatic inflammation and stellate-cell activation in fibrosis, highlighting SCFAs, LPS/TLR4 signaling, and microbiota effects on intestinal iron transport as actionable pathways.

This study shows that IL-6-dependent hepcidin induction is a dominant host response to both bacterial (S. pneumoniae) and viral (influenza PR8) pneumonia, and to several TLR ligands, with IL-6 knockout or antibody blockade largely abolishing hepcidin upregulation.

This mechanistic study shows IL-6 directly induces hepcidin transcription via STAT3 binding to a defined promoter element (CE9) in hepatocyte-like cells, explaining a key pathway for anemia of inflammation and offering a framework for integrating inflammatory iron restriction into microbiome-related clinical interpretation.

This study showed that hepcidin ferroportin internalization is driven by direct binding of hepcidin to ferroportin, triggering lysosomal degradation and blocking iron export. The mechanism explains inflammatory hypoferremia and iron-loading disorders, although no microbiome taxa were assessed.

This review explains how hepcidin and ferroportin govern systemic iron absorption, recycling, and inflammation-driven iron restriction. It reframes iron overload and anemia syndromes as disorders of hepcidin deficiency or excess, with direct implications for diagnosis, therapy, and microbial iron ecology.

Hepcidin urinary antimicrobial peptide is a liver-derived, disulfide-rich peptide found in urine that kills select bacteria and inhibits fungal growth. It is primarily expressed in the liver, exists as multiple processed isoforms, and shows salt-sensitive antimicrobial activity relevant to host–microbe interactions.

LEAP-1 is a newly discovered, liver-expressed antimicrobial peptide found in human plasma. It is a 25–amino acid, four–disulfide peptide with strongest activity against Gram-positive bacteria and yeast, suggesting a liver-linked innate immune mechanism that may shape microbiome composition.

Aflatoxin is a carcinogenic foodborne mycotoxin that damages the liver through DNA-reactive metabolites. It also disrupts gut microbiome metabolism and gut–liver signaling, potentially contributing to inflammation and barrier dysfunction. Microbiome medicine integrates exposure biomarkers with microbial and metabolic signatures for risk assessment.

This study shows that aflatoxin B1 detoxification can be achieved by Bacillus amyloliquefaciens WF2020, mainly via thermostable extracellular enzymes, while also suppressing Aspergillus flavus aflatoxin gene expression and eliminating toxin production. Safety assays supported low toxicity.

Aflatoxin B1 gut microbiota metabolism is disrupted in F344 rats, with dose-dependent loss of fecal metabolites, reduced SCFAs and polyamines, and major pathway derangements (amino acids, pantothenate/CoA, pyruvate). Eight indicator metabolites form a predictive fecal signature of microbiota-dependent metabolic toxicity.

A mechanistic review of how aflatoxin B1 (a fungal toxin) is activated by CYP3A4 into a DNA-reactive epoxide and detoxified mainly by GSTs, especially GSTM1-1. Epoxide hydrolase contributes little. Chemoprevention may work by inhibiting P450s and inducing GSTs.

This review synthesizes evidence that aflatoxins and fumonisins in staple foods drive major health risks, especially aflatoxin-related liver cancer amplified by HBV. It highlights biomarkers, mechanistic pathways, emerging non-cancer outcomes, and practical prevention strategies to reduce exposure globally.

This review links aflatoxin growth impairment through biomarker-supported evidence, especially in West African children during weaning. Dose–response associations with stunting and reduced height velocity suggest aflatoxin contributes to growth faltering, potentially via immune modulation and gut barrier disruption.

This mouse study evaluated acute safety of soluble allomelanin and engineered melanized E. coli Nissle. Neither caused weight loss or intestinal inflammation, and targeted microbial markers remained stable, while melanized E. coli Nissle rapidly colonized the gut within 3 hours and persisted for 24 hours.

Melanin is a family of biologic pigments with strong UV-absorbing and antioxidant properties. Humans use melanin for photoprotection, while many microbes use melanin to resist stress and enhance survival. In microbiome medicine, melanin can influence microbial resilience and host–microbe interactions.

This mouse study evaluated acute safety of soluble allomelanin and engineered melanized E. coli Nissle. Neither caused weight loss or intestinal inflammation, and targeted microbial markers remained stable, while melanized E. coli Nissle rapidly colonized the gut within 3 hours and persisted for 24 hours.

This review explains how bacteria produce melanin through DOPA, homogentisate (pyomelanin), and polyketide routes, how metals and stress regulators control pigmentation, and why melanins matter for virulence, persistence, and biotechnology.

This review explains how fungal melanin virulence in Cryptococcus neoformans enables immune evasion and persistence. In vivo melanization is supported by chemical markers, melanin-specific probes, and isolation of melanin “ghosts,” and melanization reduces susceptibility to oxidative killing and amphotericin B.

This study defines a nutrient-starvation–responsive network controlling cryptococcal melanin, centered on transcription factors Hob1, Bzp4, Usv101, and Mbs1 and upstream kinases Gsk3 and Kic1, converging on LAC1 laccase induction and pigment deposition programs.

This review explains how MC1R signaling controls eumelanin versus pheomelanin balance and how pheomelanin-biased pigmentation increases melanoma risk via oxidative stress and immune effects, including UV-independent mechanisms. No microbiome taxa or microbial pathways are reported.

This review connects microbial melanin and the microbiome to melanin’s structural diversity, measurement methods, and bioactivities. It highlights why accurate melanin classification matters and how microbial melanins may signal stress tolerance, persistence, and translational opportunities in antimicrobial and photothermal biomaterials.

Reactive oxygen species (ROS) are oxygen-based molecules that act in immune defense and cellular signaling. In the gut, epithelial and immune-cell ROS shape microbial ecology and barrier function. Excess ROS contributes to oxidative stress, inflammation, and permeability changes relevant to microbiome medicine.

This consensus statement provides reactive oxygen species measurement guidelines, emphasizing ROS chemical specificity, validated probes, orthogonal confirmation, and MS-based oxidative damage biomarkers. It warns against common artefacts (DCFH-DA, HE/MitoSOX fluorescence-only, TBARS) and stresses biomarker verification in clinical trials.