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- W135040821 abstract "These experiments were undertaken to study cell cycle-dependent regulation of expression of genes encoding cyclin-dependent kinases (Cdks). P1798 T-lymphoma cells were studied as a model system, since these cells undergo reversible G0 arrest within 24 h after addition of 0.1 microM dexamethasone to mid log phase cultures. G0 arrest is associated with inhibition of expression of several Cdks. The mRNAs encoding Cdk1 and Cdk4 decreased by 80-90% within 24 h. Fifty % inhibition of Cdk4 mRNA occurred within about 4 h, and 50% inhibition of Cdk1 mRNA was observed within 12-14 h. There was a slight decrease (< 50%) in the abundance of the mRNAs encoding Cdk2 and Cdk5. Cdk6 mRNA did not decrease in glucocorticoid-treated cells. Cdk1 and Cdk2 protein levels were reduced by no more than 50-70% within 24 h after the addition of dexamethasone, and the amounts of Cdk5 and Cdk6 protein did not change. However, the amount of Cdk4 protein decreased by > 90% under these circumstances. P1798 cells enter S phase in a synchronous fashion within 16-20 h after removal of dexamethasone. Cdk1, Cdk2, and Cdk5 mRNAs and proteins increased at or after the time that cells began to enter S phase. The mRNA encoding Cdk4 increased much more rapidly after removal of glucocorticoids, and a 5-fold increase in Cdk4 mRNA abundance was observed within 8 h after removal of the steroid. A corresponding increase in Cdk4 protein was observed, indicating that inhibition of Cdk4 expression is more proximal to the glucocorticoid-induced blockade in G1 progression.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W135040821 date "1995-06-01" @default.
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- W135040821 title "Glucocorticoid regulation of G1 cyclin-dependent kinase genes in lymphoid cells." @default.
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