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Related Concept Videos

Development of Immunocompetence01:22

Development of Immunocompetence

548
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.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
548

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Related Experiment Video

Updated: Nov 3, 2025

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Microbial exposure during early human development primes fetal immune cells.

Archita Mishra1, Ghee Chuan Lai1, Leong Jing Yao2

  • 1Singapore Immunology Network (SIgN), A(∗)STAR, 8A Biomedical Grove, Immunos Building, Level 4, Singapore 138648, Singapore.

Cell
|June 2, 2021
PubMed
Summary

Live microbes, including Staphylococcus and Lactobacillus, were detected in fetal organs during the second trimester, priming the fetal immune system. This suggests in utero microbial exposure is crucial for developing immune competency before birth.

Keywords:
TemTregbacteriafetal Developmentfetal immunityimmune memoryimmune primingmicrobesmicrobiome

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Area of Science:

  • Immunology
  • Microbiology
  • Developmental Biology

Background:

  • The development of the human fetal immune system starts early in gestation.
  • Factors driving fetal immune priming remain largely unknown.
  • Understanding prenatal immune development is critical for lifelong health.

Purpose of the Study:

  • To investigate the presence and impact of in utero microbial exposure on fetal immune system development.
  • To determine if microbial agents contribute to the activation of memory T cells in fetal tissues.

Main Methods:

  • 16S rRNA gene sequencing was used to profile microbes across fetal organs (gut, skin, placenta, lungs).
  • Live bacterial strains were identified in fetal tissues.
  • In vitro assays assessed the activation of memory T cells from fetal mesenteric lymph nodes.
  • Scanning Electron Microscopy (SEM) and RNA In Situ Hybridization (RNA-ISH) visualized microbial structures and RNA in fetal gut.

Main Results:

  • A consistent, low-level microbial signal was detected in fetal gut, skin, placenta, and lungs during the second trimester.
  • Live bacterial strains, including Staphylococcus and Lactobacillus, were identified in fetal tissues.
  • Exposure to these bacteria induced in vitro activation of memory T cells from fetal mesenteric lymph nodes.
  • SEM and RNA-ISH confirmed the presence of bacteria-like structures and eubacterial-RNA within the fetal gut lumen by the 14th week of gestation.

Conclusions:

  • Live microbes are selectively present in fetal organs during the second trimester of gestation.
  • Microbial exposure in utero plays a role in fetal immune-priming and the activation of memory T cells.
  • These findings have significant implications for establishing immune competency before birth.