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Jak3 selectively regulates Bax and Bcl-2 expression to promote T-cell development. Mol Cell Biol 2001 Jan;21(2):678-89



Pubmed ID


Pubmed Central ID




Scopus ID

2-s2.0-0035159241   61 Citations


Jak3-deficient mice display vastly reduced numbers of lymphoid cells. Thymocytes and peripheral T cells from Jak3-deficient mice have a high apoptotic index, suggesting that Jak3 provides survival signals. Here we report that Jak3 regulates T lymphopoiesis at least in part through its selective regulation of Bax and Bcl-2. Jak3-deficient thymocytes express elevated levels of Bax and reduced levels of Bcl-2 relative to those in wild-type littermates. Notably, up-regulation of Bax in Jak3-deficient T cells is physiologically relevant, as Jak3 Bax double-null mice have marked increases in thymocyte and peripheral T-cell numbers. Rescue of T lymphopoiesis by Bax loss was selective, as mice deficient in Jak3 plus p53 or in Jak3 plus Fas remained lymphopenic. However, Bax loss failed to restore proper ratios of peripheral CD4/CD8 T cells, which are abnormally high in Jak3-null mice. Transplantation into Jak3-deficient mice of Jak3-null bone marrow transduced with a Bcl-2-expressing retrovirus also improved peripheral T-cell numbers and restored the ratio of peripheral CD4/CD8 T cells to wild-type levels. The data support the concepts that Jak kinases regulate cell survival through their selective and cell context-dependent regulation of pro- and antiapoptotic Bcl-2 family proteins and that Bax and Bcl-2 play distinct roles in T-cell development.

Author List

Wen R, Wang D, McKay C, Bunting KD, Marine JC, Vanin EF, Zambetti GP, Korsmeyer SJ, Ihle JN, Cleveland JL


Demin Wang PhD Assistant Professor in the Microbiology and Immunology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

CD4-CD8 Ratio
CD8-Positive T-Lymphocytes
Cell Differentiation
Cell Survival
Flow Cytometry
Fluorescent Antibody Technique
Gene Deletion
Gene Expression Regulation
In Situ Nick-End Labeling
Janus Kinase 3
Mice, Knockout
Protein-Tyrosine Kinases
Proto-Oncogene Proteins
Proto-Oncogene Proteins c-bcl-2
Thymus Gland
bcl-2-Associated X Protein
jenkins-FCD Prod-469 c3fc8ab87196149f9b23743c01b947d47e7319e5