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PMID:7751019
| Citation |
Broome, HE, Dargan, CM, Bessent, EF, Krajewski, S and Reed, JC (1995) Apoptosis and Bcl-2 expression in cultured murine splenic T cells. Immunology 84:375-82 |
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| Abstract |
To elucidate the mechanism by which bcl-2 affects apoptosis in post-thymic T cells, we investigated the expression of Bcl-2 protein in primary cultures of splenic T cells and in the interleukin-2 (IL-2)-dependent T-cell line CTLL-2. The overall level of Bcl-2 was determined by immunoblotting, and the variability in Bcl-2 expression was determined by flow cytometry. For a few days after concanavalin A (Con A) plus IL-2 activation, the overall level of Bcl-2 in T cells remains unchanged, but it becomes more heterogeneous. By 5 days after activation, the expression returns to a more homogeneous distribution, but it is increased up to threefold above pre-activation levels, depending upon the dose of IL-2 supplied. When Con A blasts or CTLL-2 cells are deprived of IL-2 for 24 hr, there is no change in their overall Bcl-2 levels which remain homogeneous even though almost half of the cells are apoptotic. However, when bcl-2 transfected CTLL-2 cells are deprived of IL-2, they do not undergo apoptosis, and their endogenous Bcl-2 protein level slowly decreases relative to their total protein. These data document the IL-2-dependent expression of Bcl-2 in activated T cells, confirm the ability of deregulated bcl-2 to inhibit the onset of apoptosis after IL-2 withdrawal, but suggest that, after IL-2 withdrawal, a drop in Bcl-2 levels relative to total protein levels does not precede apoptosis. |
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| Keywords |
Animals; Apoptosis/immunology; Apoptosis/physiology; Cells, Cultured; Concanavalin A/immunology; Dose-Response Relationship, Immunologic; Flow Cytometry; Interleukin-2/immunology; Lymphocyte Activation; Mice; Mice, Inbred C57BL; Proto-Oncogene Proteins/immunology; Proto-Oncogene Proteins/metabolism; Proto-Oncogene Proteins c-bcl-2; Spleen/immunology; Spleen/metabolism; T-Lymphocytes/immunology; T-Lymphocytes/metabolism; Tumor Cells, Cultured |
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Significance
Annotations
| Gene product | Qualifier | GO ID | GO term name | Evidence Code | with/from | Aspect | Notes | Status |
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