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T cells and CD45R expression in B-chronic lymphocytic leukemia.
P G Briggs1, N Kraft, R C Atkins
1Department of Nephrology, Monash Medical Centre, Melbourne, Australia.
Leukemia Research
|January 1, 1990
Summary
Patients with B cell chronic lymphocytic leukemia (B-CLL) exhibit altered T cell populations, specifically an excess of CD45R+ suppressor-inducer T cells. This finding helps explain immune dysfunction and disease progression in B-CLL.
Area of Science:
- Immunology
- Hematology
- Oncology
Background:
- B cell chronic lymphocytic leukemia (B-CLL) is characterized by significant secondary immunodeficiency affecting both humoral and cellular immunity.
- Previous studies noted T cell subset redistributions in B-CLL, but the underlying mechanisms remain largely unexplained.
Purpose of the Study:
- To investigate the immunophenotype of T cells in B-CLL by assessing CD45R expression.
- To explore relationships between T cell subsets, disease progression, and immune dysfunction in B-CLL.
Main Methods:
- Employed a two-colour immunofluorescence technique to analyze CD45R expression on T cell subsets (CD3+, CD4+, CD8+).
- Correlated T cell subset counts with total leukocyte counts and clinical disease stage.
Main Results:
- Significantly higher proportions of CD45R+ cells were observed among CD3+, CD4+, and CD8+ T cells in B-CLL patients compared to normal controls (p < 0.001).
- Strong positive correlations were found between total leukocyte count and the numbers of CD3+, CD4+, CD8+ cells, and monocytes in B-CLL.
- Patients with more advanced disease showed higher numbers of CD3+ and CD4+ T cells (p < 0.05).
Conclusions:
- An excess of CD45R+ suppressor-inducer T cells is a key feature of B-CLL.
- This T cell abnormality has significant implications for both B and T cell dysfunction observed in B-CLL.
- The findings suggest a role for CD45R+ T cells in the progression of B-CLL.