Cyclic nucleotides and calcium in human lymphocytes induced to divide
Rochette-Egly, C.; Kempf, J.
Journal de Physiologie 77(6-7): 721-725
1981
ISSN/ISBN: 0021-7948 PMID: 6270320 Document Number: 171270
Intracellular concentrations of cyclic adenosine 3'-5' monophosphate (cAMP) and cyclic guanosine 3'-5' monophosphate (cGMP) were measured in human lymphocytes induced to divide by the addition of lectins, 12-O-tetra-decanoylphorbol-13-acetate (TPA) and the calcium ionophore A 23187. cGMP levels rose within minutes without concomitant alterations in cAMP concentration. The cAMP and cGMP levels rose during the prereplicative and replicative phases respectively. Under calcium depleting conditions, both the fluctuations in cyclic nucleotide levels and the increase in [3H[ thymidine incorporation into DNA were abolished, suggesting a role for calcium ions in the regulation of lymphocyte proliferation.