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Age-related structural modulation of T lymphocyte-associated CD45 isoforms
F Abdul-Salam1, M G Moulana, M H Mansour
1Department of Biological Sciences, Faculty of Science, Kuwait University, P.O. Box 5969, Safat, Kuwait.
Mechanisms of Ageing and Development
|March 25, 2000
Summary
Aging alters CD45 isoforms in mouse immune cells. Thymocyte maturation shows reduced CD45 heterogeneity in aged mice, impacting T cell function and senescence.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- The CD45 protein tyrosine phosphatase is crucial for lymphocyte development and function.
- Age-related changes in immune cell phenotype are well-documented, but specific molecular alterations like CD45 isoform expression remain less understood.
Purpose of the Study:
- To investigate age-related differential expression of CD45 isoforms in mouse thymocytes and peripheral T cells.
- To explore the impact of aging on CD45 isoform heterogeneity and sialylation.
Main Methods:
- Two-dimensional (2D) SDS-PAGE and Western blotting using a pan-CD45 monoclonal antibody.
- Analysis of thymocytes and CD4+/CD8+ T cells from newly-born, young, and aged BALB/c mice.
- Comparison of sialylated and desialylated CD45 forms.
Main Results:
- Young mice thymocytes exhibited distinct CD45 isoforms with heterogeneous acidic charges during maturation.
- Aged mice thymocyte maturation showed minimal CD45 heterogeneity, resembling immature cells.
- Age-related differences in peripheral CD4+ and CD8+ T cells primarily involved the degree of CD45 isoform sialylation.
Conclusions:
- Aging significantly impacts CD45 isoform expression and heterogeneity during thymocyte maturation.
- Differential sialylation of CD45 isoforms in aged T cells may influence lymphocyte recognition and cell interactions.
- Age-related changes in CD45 sialylation contribute to complexity in lymphocyte maturation and senescence.