Epidermal growth factor stimulation of prostacyclin production by cultured aortic smooth muscle cells: requirement for increased cellular calcium levels.

Abstract:

:We have examined the ability of epidermal growth factor (EGF) to regulate prostacyclin production by cultured A10 smooth muscle cells. EGF by itself had no effect on prostacyclin production, but it augmented the response to arg8-vasopressin. An AGF stimulation of prostacyclin production was also observed in the presence of the calcium ionophore A23187; it therefore seemed likely that the key event required for EGF to stimulate prostacyclin production might be an increase in the available cellular Ca2+. Studies with 45Ca2+ showed that vasopressin both mobilised Ca2+ from intracellular stores and increased the influx of extracellular Ca2+ into A10 cells. The increase in prostacyclin production caused by vasopressin and the augmentation by EGF were both abolished by TMB-8, an antagonist of Ca2+ mobilisation, by EGTA, a chelator of Ca2+ ions, or by incubating cultures in the absence of added Ca2+. These results were consistent with a central role for Ca2+ in the responses and showed that both intracellular and extracellular sources of Ca2+ were important for the triggering of prostacyclin production. The increases in prostacyclin production were only marginally affected by nifedipine, and no responses were seen (either in the absence or presence of EGF) when KCl was used to depolarise the cell membrane. These data indicated that uptake of Ca2+ ions via voltage-dependent channels was unlikely to be a major factor in the stimulation of prostanoid production. We conclude that the ability of EGF to stimulate prostacyclin production in A10 smooth muscle cells depends upon a concurrent stimulus that will increase available intracellular Ca2+ levels.

journal_name

J Cell Physiol

authors

Blay J,Hollenberg MD

doi

10.1002/jcp.1041390311

subject

Has Abstract

pub_date

1989-06-01 00:00:00

pages

524-30

issue

3

eissn

0021-9541

issn

1097-4652

journal_volume

139

pub_type

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