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Related Experiment Videos

Occult CD45 T cell developmental defect in type 1 diabetes

D L Faustman1

  • 1Immunobiology Laboratories, Harvard Medical School, Charlestown, MA 02129.

Diabete & Metabolisme
|September 1, 1993
PubMed
Summary

Individuals with Type 1 diabetes and high-risk relatives show abnormal T cell responses. Their CD4+ T cells exhibit excessive proliferation and blocked developmental transitions, indicating shared intrinsic defects in T cell development.

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Area of Science:

  • Immunology
  • Endocrinology
  • Genetics

Background:

  • Individuals with insulin-dependent diabetes mellitus (Type 1 diabetes) and high-risk prediabetic subjects exhibit distinct T cell responses.
  • Autologous antigen-presenting cell (APC) defects are observed in Type 1 diabetes, leading to reduced T cell proliferation.
  • Lower-risk relatives display excessive T cell proliferation, suggesting a different immune dysregulation.

Purpose of the Study:

  • To characterize the nature of the vigorous T cell response in lower-risk relatives.
  • To investigate T cell developmental transitions in individuals at risk for Type 1 diabetes.
  • To compare T cell phenotypes between lower-risk relatives and Type 1 diabetic patients.

Main Methods:

  • In vitro autologous mixed lymphocyte reaction (AMLR) assays were performed.
  • Flow cytometry was used to analyze T cell subsets, including CD4+ T cells and their CD45RA/CD45RO expression.
  • T cell reconstitution experiments were conducted using cells from diabetic and non-diabetic twins.

Main Results:

  • Lower-risk relatives showed a predominant and excessive proliferation of CD4+ T cells to self-antigens in AMLR.
  • A partial block in the normal transition of CD45RA+ to CD45RA-RO+ CD4+ T cells was observed in lower-risk individuals.
  • Abnormal coexpression of CD45RA and CD45RO on CD4+ T cells was increased in lower-risk relatives.
  • Reconstitution experiments with diabetic twin's T cells and non-diabetic twin's APCs resulted in defective CD45 transitions, similar to lower-risk relatives.

Conclusions:

  • T cells from lower-risk relatives and Type 1 diabetic individuals share intrinsic developmental defects in CD45 transitions.
  • These defects become apparent after normal autologous antigen stimulation.
  • The findings suggest a common underlying immune dysregulation contributing to Type 1 diabetes development.

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