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IQI/Jic mice have thymic B cells

J Saegusa1, A Yasuda, H Kubota

  • 1Laboratory of Experimental Toxicology, National Institute of Industrial Health, Kawasaki, Japan.

Experimental Animals
|October 1, 1996
PubMed
Summary

Thymic B cells (Thy B) are more prevalent in female IQI/Jic mice and increase with age. These mice exhibit impaired immune responses, suggesting a link between Thy B and immune system disorders.

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Area of Science:

  • Immunology
  • Developmental Biology
  • Mouse Models

Background:

  • The thymus is crucial for T cell maturation.
  • Aberrant immune cell populations in the thymus can lead to immune dysfunction.
  • IQI/Jic mice represent a unique genetic background for immunological studies.

Purpose of the Study:

  • To investigate the presence and characteristics of thymic B cells (Thy B) in IQI/Jic mice.
  • To determine the age- and sex-dependent incidence of Thy B.
  • To assess the immunological consequences of Thy B presence.

Main Methods:

  • Chronological study of thymus from 3 to 15 months of age.
  • Flow cytometry and immunohistochemistry for Thy B detection (B220+IgM+).
  • Mercuric chloride injection to assess antibody production.

Main Results:

  • Thy B were detected in both sexes, predominantly in females, appearing by 4 months.
  • Thy B incidence and proportion increased with age, especially in females (>90% and >15% after 9 months).
  • Thy B-rich thymuses showed thickening, cortical atrophy, and medullary hyperplasia, with Thy B forming follicle-like structures.
  • Thy B-rich mice exhibited impaired antinucleolar antibody production after mercuric chloride challenge.

Conclusions:

  • IQI/Jic mice develop a significant population of thymic B cells, particularly females.
  • The presence of Thy B is associated with thymic structural abnormalities and immunological impairment.
  • IQI/Jic mice serve as a novel model for studying the relationship between thymic B cells and immune disorders.

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