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. 1996 Nov 1;319(Pt 3):929–933. doi: 10.1042/bj3190929

Interleukin-2 induces gamma-S-adenosyl-L-methionine synthetase gene expression during T-lymphocyte activation.

R Tobeña 1, S Horikawa 1, V Calvo 1, S Alemany 1
PMCID: PMC1217877  PMID: 8921001

Abstract

The regulation of expression of the gamma-S-adenosyl-L-methionine (AdoMet) synthetase gene was investigated in T-cells during G0/G1 transition, as well as throughout the G1 phase. Stimulation of G0 T-lymphocytes with concanavalin A induces AdoMet synthetase gene expression, starting 8 h after stimulation. Interleukin-2 (IL-2) stimulates the induction of this gene expression and AdoMet synthetase activity in G1 lymphoblasts, in part by an increase in the transcription rate of the gene. Phorbol esters, which also stimulate the proliferation of G1 lymphoblasts, show a similar kinetics of AdoMet synthetase mRNA induction. In contrast, the mRNA levels of the S-adenosyl-L-homocysteine hydrolase, another enzyme of the methionine cycle, remain unchanged upon IL-2 or phorbol 12,13-dibutyrate treatment. Dexamethasone and 8Br-cAMP, both inhibitors of lymphocyte proliferation, are able to block the expression of the AdoMet synthetase gene and, consequently, AdoMet synthetase activity. Together these findings indicate that the AdoMet synthetase gene is subject to cell-cycle regulation in T-lymphocytes.

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