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The Journal of Immunology, Vol 154, Issue 12 6275-6284, Copyright © 1995 by American Association of Immunologists

ARTICLES

Regulation of synthesis and activity of the PLSTIRE protein (cyclin- dependent kinase 6 (cdk6)), a major cyclin D-associated cdk4 homologue in normal human T lymphocytes

JJ Lucas, A Szepesi, JF Modiano, J Domenico and EW Gelfand
Department of Pediatrics, National Jewish Center for Immunology and Respiratory Medicine, Denver, CO 80206, USA.

The PLSTIRE protein (cyclin-dependent kinase 6 (cdk6)), which shares extensive sequence homology (approximately 70%) with cdk4, was identified as the earliest inducible member of the cdk family of proteins in human T lymphocytes induced to proliferate in vitro by stimulation either with phorbol 12,13-dibutyrate and ionomycin (PDB/I) or PHA. The p40cdk6 protein was present in resting cells and increased amounts were detected 6 h after stimulation. It increased in amount throughout the first cell cycle but was present in reduced amounts at later times. Activity of the kinase, determined by in vitro phosphorylation of recombinant truncated retinoblastoma tumor suppressor gene (Rb) protein (p60Rb), paralleled p40cdk6 protein amounts. Cyclins D2 and D3 were the major cyclins associated with p40cdk6, with D2 predominating in early G1 phase. Both PDB and ionomycin were required for maximal accumulation of p40cdk6, but either agent alone stimulated some increase in amount and activity of the protein. p40cdk6 also increased in amount in cells activated in the presence of cyclosporin A or FK506, drugs that inhibit production of IL- 2 and cell proliferation, suggesting that initial induction occurred independently of IL-2-mediated cell cycle progression. Furthermore, increased accumulation of p40cdk6 protein and activity occurred in cells rendered "competent" (responsive to IL-2) by a brief treatment with PDB/I. Thus, increased accumulation of the protein and its activity begin before IL-2/IL-2 receptor interaction, suggesting that the cdk6-cyclin D2 complex might be involved in acquisition of the competent state in human T lymphocytes.


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