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Development of Immunocompetence01:22

Development of Immunocompetence

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Introduction to Innate and Adaptive Immunity01:21

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The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
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Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
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Development of Human Microbiota01:30

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The human microbiota begins developing at birth and undergoes continual change as we age. Infancy marks a critical period of microbial sensitivity, offering a “window of opportunity” during which beneficial microbes help mature the immune system. By age three, children typically develop a more stable and diverse microbial community. Newborns acquire microbes from their immediate environment; vaginal delivery favors maternal vaginal microbes, while cesarean births favor microbes from...
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Development of the Oral Microbiota01:28

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The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...
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The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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Related Experiment Video

Updated: Apr 14, 2026

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Innate Immunity and Microbial Recognition in Reproduction: From Barrier Defense to Maternal-Fetal Tolerance.

Xianlin Rao1, Li Zou2, Yao Yao3

  • 1Department of Infectious Disease, Tongde Hospital of Zhejiang Province, Hangzhou, Zhejiang, China.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|April 13, 2026
PubMed
Summary

Reproduction relies on the innate immune system balancing defense and tolerance. This review outlines a framework integrating barriers, immune signaling, and microbiota to ensure reproductive success and prevent disorders.

Keywords:
innate immunitymaternal–fetal interfacemicrobiotapattern recognition receptorspregnancy complicationsreproductive tract

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Area of Science:

  • Reproductive immunology and innate immunity.

Background:

  • Reproduction demands the innate immune system prevent microbial invasion while maintaining tolerance to semi-allogeneic gametes and fetuses.
  • The female and male reproductive tracts and maternal-fetal interface require coordinated defense and tolerance mechanisms.

Purpose of the Study:

  • To propose a unified barrier defense-tolerance framework for reproductive success.
  • To review the role of innate immune pathways, microbiota, and metabolic regulation in reproduction.
  • To explore the contribution of immune dysregulation to reproductive disorders.

Main Methods:

  • Literature review synthesizing findings on innate immunity, barrier function, and microbiota in reproduction.
  • Analysis of pattern-recognition receptor signaling pathways (Toll-like receptors, NOD-like receptors, RIG-I-like receptors, cGAS-STING).
  • Examination of microbiota-host interactions and the role of gut-derived metabolites.

Main Results:

  • A barrier defense-tolerance framework integrates epithelial barriers, antimicrobial peptides, complement, immune cells, and signaling pathways.
  • Innate immune pathways critically shape gamete quality, sperm transit, implantation, placentation, and antiviral defense.
  • Dysregulated inflammation is linked to infertility, pregnancy loss, preeclampsia, and fetal growth restriction.
  • Cervicovaginal microbiota evidence is strongest; other reproductive tract microbiota require cautious interpretation.
  • Gut metabolites influence immune tone and barrier function in reproductive tissues.

Conclusions:

  • Reproductive success hinges on integrated barrier defense and tolerance mechanisms.
  • Reproductive disorders represent systems-level disruptions in host-microbe-metabolite interactions.
  • Future research should focus on multi-omics and mechanism-driven approaches for reproductive immunology.
  • Translational relevance lies in biomarker development and targeted interventions for reproductive health.