title: Activation of platelet-derived growth factor (PDGF) receptor dephosphorylation in intact Swiss 3T3 cells by elevators of intracellular Ca2+ and cAMP.
abstract: We investigated the modulation of platelet-derived growth factor (PDGF) receptor dephosphorylation in Swiss 3T3 cells using a novel assay permitting monitoring of receptor dephosphorylation in intact cells. PDGF treatment of the cells reduced the receptor dephosphorylation rate to 41%, the elevators of intracellular Ca2+, A23187 and thapsigargin increasing it to 227 and 138%, respectively. The cAMP elevators forskolin and isobutylmethylxanthine also accelerated PDGF receptor dephosphorylation. The involvement of Ca(2+)- and cAMP-dependent protein kinases in the regulation of PDGF receptor dephosphorylation is suggested.
authors.affiliation: Max-Planck Society, Research Unit Molecular Cell Biology, Medical Faculty, Friedrich-Schiller University, Jena, Germany.
authors.forename: F D
authors.initials: FD
authors.lastname: Böhmer
authors.forename: S A
authors.initials: SA
authors.lastname: Böhmer
mesh_terms: D015056:1-Methyl-3-isobutylxanthine / Q000494:pharmacology; D016475:3T3 Cells; D000818:Animals; D000001:Calcimycin / Q000494:pharmacology; D002118:Calcium / Q000378:metabolism*; D000252:Calcium-Transporting ATPases / Q000037:antagonists & inhibitors; D002455:Cell Division; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D007700:Kinetics; D051379:Mice; D010982:Platelet-Derived Growth Factor / Q000494:pharmacology*; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism*; D017479:Receptors, Platelet-Derived Growth Factor / Q000187:drug effects / Q000378:metabolism*; D013729:Terpenes / Q000494:pharmacology; D019284:Thapsigargin
chemical_list: D004791:Enzyme Inhibitors; D010982:Platelet-Derived Growth Factor; D013729:Terpenes; D005576:Colforsin; D000001:Calcimycin; D019284:Thapsigargin; D000242:Cyclic AMP; D017479:Receptors, Platelet-Derived Growth Factor; D017027:Protein Tyrosine Phosphatases; D000252:Calcium-Transporting ATPases; D002118:Calcium; D015056:1-Methyl-3-isobutylxanthine