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. 1984 May;3(5):939–944. doi: 10.1002/j.1460-2075.1984.tb01911.x

Ionic responses rapidly elicited by porcine platelet-derived growth factor in Swiss 3T3 cells.

A Lopez-Rivas, P Stroobant, M D Waterfield, E Rozengurt
PMCID: PMC557455  PMID: 6329747

Abstract

Addition of porcine platelet-derived growth factor (PDGF) to quiescent cultures of Swiss 3T3 cells caused a marked, dose-dependent stimulation of Na+ influx and Na-K pump-mediated 86Rb+ uptake. Porcine PDGF (a single component in SDS polyacrylamide gels) stimulated ion fluxes to the same maximal extent as partially purified preparations, and exhibited half-maximal effect at 6 ng/ml (2 X 10(-10) M). Maximal effect was achieved at 30 ng/ml (10(-9) M). In the presence of insulin, PDGF elicited mitogenesis at comparable concentrations. PDGF stimulated ion uptake in a time-dependent fashion; maximal effect was obtained after 5 min of exposure to the growth factor. PDGF stimulates Na+ influx via an amiloride-sensitive pathway, suggesting that PDGF enhances the activity of a Na+/H+ antiport system. In accordance with this possibility, the mitogen caused an increase of intracellular pH by 0.15 pH units, as judged by the steady-state distribution of labelled 5,5-dimethyloxazolidine-2,4-dione (DMO). Porcine PDGF stimulated E-type prostaglandin synthesis and cAMP accumulation but these events could be dissociated from the stimulation of the ionic fluxes, which was detected within minutes and was not blocked by indomethacin. It is suggested that PDGF elicits multiple signals to stimulate cell proliferation in 3T3 cells.

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Selected References

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