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. 1988 Sep;85(18):6900–6903. doi: 10.1073/pnas.85.18.6900

Coordinate regulation of mRNAs encoding adenosine deaminase, purine nucleoside phosphorylase, and terminal deoxynucleotidyltransferase by phorbol esters in human thymocytes.

H Martinez-Valdez 1, A Cohen 1
PMCID: PMC282086  PMID: 3137577

Abstract

Incubation of human thymocytes in the presence of phorbol esters caused a reversible decrease in the mRNAs encoding terminal deoxynucleotidyltransferase (TdT; EC 2.7.7.31) and adenosine deaminase (ADA; EC 3.5.4.4) and an increase in the mRNA encoding purine nucleoside phosphorylase (PNP; EC 2.4.2.1). The effect of phorbol esters on TdT and ADA mRNA levels can be attributed to an apparent decrease in the stability of the mRNAs. The changes in ADA, TdT, and PNP mRNAs closely simulate changes in the activities of these enzymes that occur during T-cell differentiation in vivo, suggesting a role for protein kinase C activation in the regulation of the expression of these genes during intrathymic T-cell differentiation. A role for these purine degradation enzymes in the regulation of intracellular pools of the deoxynucleotide substrates of TdT is discussed.

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