The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 182, 401-408, Copyright © 1995 by Rockefeller University Press


ARTICLES

Induction of G1 arrest by down-regulation of cyclin D3 in T cell hybridomas

S Miyatake, H Nakano, SY Park, T Yamazaki, K Takase, H Matsushime, A Kato and T Saito
Division of Molecular Genetics, School of Medicine, Chiba University, Japan.

The relationship between activation-induced growth inhibition and regulation of the cell cycle progression was investigated in T cell hybridomas by studying the function of the cell cycle-regulating genes such as G1 cyclins and their associated kinases. Activation of T cell hybridomas by anti-T cell receptor antibody induces growth arrest at G1 phase of the cell cycle and subsequently results in activation-driven cell death. Rapid reduction of both messenger RNA and protein level of the cyclin D3 is accompanied by growth arrest upon activation. Although the residual cyclin D3 protein forms a complex with cdk4 protein, cyclin D3-dependent kinase activity is severely impaired. Stable transfectants engineered to express cyclin D3 override the growth arrest upon activation. These results imply that the activation signal through T cell receptor induces the down-regulation of cyclin D3 expression and cyclin D3-dependent kinase activity, leading to growth arrest in G1 phase of the cell cycle in T cells.
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