The opposing effects of calmodulin, adenosine 5'-triphosphate, and pertussis toxin on phorbol ester induced inhibition of atrial natriuretic factor stimulated guanylate cyclase in SK-NEP-1 cells.

Abstract:

:In the present study, we investigated the effects of calmodulin, adenosine 5'-triphosphate (ATP) and pertussis toxin (PT) on phorbol ester (PMA) (a protein kinase C activator) induced inhibition of ANF-stimulated cyclic GMP formation in cells from the human renal cell line, SK-NEP-1. PMA inhibited ANF-stimulated guanylate cyclase activity in particulate membranes by about 65%. Calmodulin reversed this inhibition in a dose dependent manner. ATP potentiated Mg++ but not Mn++ supported guanylate cyclase activity. In PMA treated membranes, ATP potentiating effects were abolished. PMA also inhibited ANF-stimulated cGMP accumulation, but pretreatment with PT prevented this PMA inhibition. PT did not affect basal or ANF-stimulated cGMP accumulation. In conclusion, these results demonstrated that PMA (activated protein kinase C) inhibited ANF stimulation of particulate guanylate cyclase in opposition to the activating effects of calmodulin or ATP in SK-NEP-1 cells. The protein kinase C inhibitory effects appeared to be mediated via a PT-sensitive G protein.

journal_name

Life Sci

journal_title

Life sciences

authors

Sekiya M,Frohlich ED,Cole FE

doi

10.1016/0024-3205(91)90508-9

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

1067-73

issue

11

eissn

0024-3205

issn

1879-0631

pii

0024-3205(91)90508-9

journal_volume

48

pub_type

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