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Early T-cell defects in pre-type 1 diabetes
L al Sakkaf1, P Pozzilli, P J Bingley
1Department of Diabetes and Metabolism, St. Bartholomew's Hospital, London, UK.
Acta Diabetologica
|January 1, 1992
Summary
High islet cell antibody (ICA) titres in relatives of type 1 diabetes patients correlate with reduced CD4+ T-cells, impacting the CD4/CD8 ratio. This suggests immune dysregulation in pre-type 1 diabetes susceptibility.
Area of Science:
- Immunology
- Endocrinology
- Diabetes Research
Background:
- Alterations in lymphocyte subsets are noted in pre-type 1 diabetes.
- The relationship between lymphocyte subsets and islet cell antibodies (ICA) in this context is not well understood.
Purpose of the Study:
- To prospectively investigate changes in lymphocyte subsets in first-degree relatives of type 1 diabetes patients.
- To correlate these immunological changes with ICA titres.
Main Methods:
- Prospective study of 86 first-degree relatives of type 1 diabetes patients.
- Analysis of lymphocyte subsets (CD3, CD4, CD8) and ICA titres.
- Further characterization of CD4 subsets using CD45RO, CD45RA, and CD29.
Main Results:
- First-degree relatives with ICA titres >20 JDF units showed significantly decreased CD3 cells, primarily in the CD4 subset, leading to a reduced CD4/CD8 lymphocyte ratio.
- Individuals with ICA titres between 5-20 JDF units exhibited abnormalities in CD3 and CD4 lymphocytes, but not the CD4/CD8 ratio.
- Longitudinal analysis indicated impaired CD4/CD8 ratio in susceptible individuals with high ICA titres, mainly due to CD4 subset reduction.
Conclusions:
- High ICA titres in individuals at risk for type 1 diabetes are associated with specific alterations in T-cell subsets.
- A reduced CD4/CD8 lymphocyte ratio, driven by CD4 subset changes, may indicate immune dysregulation in the progression towards type 1 diabetes.