The effects of cAMP on the expression of glycolytic isozymes in activated peripheral human T lymphocytes.
Forskolin, an activator of adenylate cyclase, inhibits mitogen induction of glycolytic isozymes in human peripheral T cells. Inhibition of lactate dehydrogenase isozyme activity is correlated with lowered mRNA levels, suggesting a transcriptional block in the presence of increased cAMP. Forskolin added with the mitogen, or 12-24 h after the mitogen, strongly inhibits isozyme expression and DNA synthesis, and causes cells to accumulate in the G0 or early G1 phase of the cell cycle. The data suggest that DNA synthesis and isozyme expression are both inhibited by a cAMP-sensitive step(s) in the early activation or progression phase.
Department of Biochemistry, Arrhenius Laboratory, Stockholm University, Sweden.
S
S
Marjanovic
P
P
Wollberg
S
S
Skog
T
T
Heiden
B D
BD
Nelson
D002453:Cell Cycle / Q000187:drug effects; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000494:pharmacology*; D004790:Enzyme Induction; D006019:Glycolysis / Q000187:drug effects / Q000502:physiology*; D006801:Humans; D007527:Isoenzymes / Q000096:biosynthesis* / Q000187:drug effects; D007770:L-Lactate Dehydrogenase / Q000096:biosynthesis / Q000187:drug effects / Q000235:genetics; D008213:Lymphocyte Activation / Q000187:drug effects / Q000502:physiology*; D010751:Phosphopyruvate Hydratase / Q000096:biosynthesis / Q000187:drug effects; D011770:Pyruvate Kinase / Q000096:biosynthesis / Q000187:drug effects; D012333:RNA, Messenger / Q000032:analysis; D013601:T-Lymphocytes / Q000187:drug effects / Q000201:enzymology*
D007527:Isoenzymes; D012333:RNA, Messenger; D005576:Colforsin; D000242:Cyclic AMP; D007770:L-Lactate Dehydrogenase; D011770:Pyruvate Kinase; D010751:Phosphopyruvate Hydratase