Hepoxilin A, hydroxyepoxide metabolite of arachidonic acid, stimulates transport of 45Ca across the guinea pig visceral yolk sac.

Abstract:

:The effect of hepoxilin A, a newly isolated hydroxyepoxide metabolite of arachidonic acid, on calcium transport across the visceral yolk sac membrane of the guinea pig was investigated in vitro in Ussing chambers. While 1-14C-labelled hepoxilin A itself was not transported across the membrane, it increased the rate of transport of calcium toward the side to which hepoxilin A was added. The degree of increase in calcium transport was similar whether hepoxilin A was added to the maternal side or to the fetal side of the membrane. The observed effect was dependent on the concentration of hepoxilin A over a narrow range (0.5-1.0 X 10(-6) M). It was also dependent on the time of incubation reaching maximal effect by 25 min. We have recently observed that hepoxilin A is formed from platelet-derived 12-hydroperoxyeicosatetraenoic acid (12-HPETE) through hemin and hemoglobin catalysis as well as during perifusion of 12-HPETE through isolated pancreatic islets. The present study suggests that hepoxilin A, if formed in vivo, could play a role in the mobilization of calcium.

authors

Derewlany LO,Pace-Asciak CR,Radde IC

doi

10.1139/y84-243

subject

Has Abstract

pub_date

1984-12-01 00:00:00

pages

1466-9

issue

12

eissn

0008-4212

issn

1205-7541

journal_volume

62

pub_type

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