The gut-testis axis describes the bidirectional communication between the Gut Microbiome and the male reproductive system. Gut-derived microbial metabolites, immune signals, and systemic inflammatory mediators influence testicular function, testosterone biosynthesis, and spermatogenesis, while androgen levels reciprocally shape gut microbial composition.
Iron-dependent cell death (ferroptosis) in spermatogenic cells represents one mechanistic node of this axis. The microbial metabolite 3-hydroxyphenylacetic acid (3-HPAA) has been shown to trigger ferroptosis in testicular tissue, directly linking gut microbial metabolism to spermatogenic failure ([1]Jin 2023 — Gut Metabolite 3-HPAA Rejuvenates Spermatogenic Dysfunction in Aged Mice through GPX4-Mediated FerroptosisZirun Jin, Yuzhuo Yang, Yalei Cao et al. · 2023Open reference 1 ↓).
This iron-ecology dimension connects the gut-testis axis to broader metallomics—iron availability in the gut selects for siderophore-producing bacteria whose metabolic outputs may propagate reproductive toxicity.
Oxidative Stress mediated by dysbiotic gut communities further impairs male fertility through systemic pathways ([2]Kurhaluk 2025 — Oxidative Stress, Antioxidants, Gut Microbiota and Male FertilityNatalia Kurhaluk, Piotr Kaminski, Halina Tkaczenko · 2025Open reference 2 ↓), while comprehensive reviews establish the gut microbiota as a regulator of testosterone levels, sperm quality, and blood-testis barrier integrity ([3]Lv 2024 — Gut Microbiota Is Involved in Male Reproductive Function: A ReviewShuya Lv, Jingrong Huang, Yadan Luo et al. · 2024Open reference 3 ↓).
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Iron-dependent cell death (ferroptosis) in spermatogenic cells represents one mechanistic node of this axis. The microbial metabolite 3-hydroxyphenylacetic acid (3-HPAA) has been shown to trigger ferroptosis in testicular tissue, directly linking gut microbial metabolism to spermatogenic failure (). This iron-ecology dimension connects the gut-testis axis to
oxidative stress mediated by dysbiotic gut communities further impairs male fertility through systemic pathways (), while comprehensive reviews establish the gut microbiota as a regulator of testosterone levels, sperm quality, and blood-testis barrier integrity ().
Contents
1. Cross-ReferencesCross-References#
- Iron—ferroptosis and siderophore ecology in male reproductive toxicity
- Semen Microbiome—reproductive tract microbial communities
- Gut-Prostate Axis—parallel gut-reproductive communication pathway
- Ferroptosis—iron-dependent cell death mechanism
- Testosterone—androgen regulation by gut microbiota
References 3
Numbered by first appearance in the article, then reconciled with its declared source list.
- 1
Zirun Jin, Yuzhuo Yang, Yalei Cao et al. (2023). Jin 2023 — Gut Metabolite 3-HPAA Rejuvenates Spermatogenic Dysfunction in Aged Mice through GPX4-Mediated Ferroptosis. Microbiome.
- 2
Natalia Kurhaluk, Piotr Kaminski, Halina Tkaczenko (2025). Kurhaluk 2025 — Oxidative Stress, Antioxidants, Gut Microbiota and Male Fertility. Cellular Physiology and Biochemistry.
- 3
Shuya Lv, Jingrong Huang, Yadan Luo et al. (2024). Lv 2024 — Gut Microbiota Is Involved in Male Reproductive Function: A Review. Frontiers in Microbiology.
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