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Bcl-2 expression in the thymus and periphery

Y Fujii¹, M Okumura, Y Takeuchi

¹First Department of Surgery, Osaka University Medical School, Japan.

Cellular Immunology

|May 1, 1994

Summary

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The Bcl-2 proto-oncogene is expressed in most T and B cells but down-regulated during antigen receptor generation. This suggests Bcl-2

Area of Science:

Immunology
Molecular Biology
Cell Biology

Background:

The Bcl-2 proto-oncogene plays a role in lymphoid tissue and cell selection.
Its expression patterns in the thymus and periphery are not fully understood.

Purpose of the Study:

To investigate the expression of Bcl-2 protein in T and B cells within the thymus and peripheral lymphoid tissues.
To correlate Bcl-2 expression with specific cell populations and cell cycle status.

Main Methods:

Utilized three-color flow cytometry to analyze Bcl-2 protein expression.
Studied thymocytes, peripheral T cells, and B cells from tonsils and lymph nodes.

Main Results:

Bcl-2 was expressed in most T and B cells.

Related Experiment Videos

Down-regulation of Bcl-2 was observed in CD4+8+ thymocytes and cycling B cells.

Early T cells, mature single positive thymocytes, and peripheral T cells consistently expressed Bcl-2.

Conclusions:

Bcl-2 down-regulation occurs in T and B cells undergoing antigen receptor gene rearrangement.
This down-regulation is linked to the process of positive selection in lymphocytes.