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The effect of linoleic and arachidonic acid derivatives on calcium transport in vesicles from cardiac sarcoplasmic reticulum.

Abstract：

:The effect of linoleic and arachidonic acid derivatives on ATP-dependent calcium transport was studied in the isolated vesicles from cardiac sarcoplasmic reticulum of guinea-pigs. Oxidation products of linoleic and arachidonic acids, obtained either by autoxidation or incubation with soybean lipoxygenase, effectively blocked in a dose-dependent manner, the net influx of calcium in the absence or presence of 5 mM of oxalate. Unoxidized fatty acids were much weaker at lower concentrations as compared to their oxidized counterparts, except the lipoxygenase-generated product of arachidonic acid which had only a marginal effect even at high concentrations. Autoxidation products of arachidonic acid were the most potent inhibitors of calcium transport. Likewise, autoxidation products of linoleic and arachidonic acids and lipoxygenase-generated products of linoleic acid induced a dose-dependent release of calcium from vesicles previously loaded with 45Ca, and release was further enhanced in the presence of 0.5 mM of EGTA. In contrast, lipoxygenase metabolites of arachidonic acid caused a transient increase in net calcium content. The effect of the fatty acid derivatives on calcium transport did not appear to be due either to the inhibition of Ca2+-ATPase activity or to a non-specific detergent-like action. The effects of oxidized fatty acids, on ATP-dependent calcium accumulation into and release from cardiac microsomal fraction were similar but less potent than those of classical calcium ionophores, X537A or A23187.

journal_name

J Mol Cell Cardiol

journal_title

Journal of molecular and cellular cardiology

authors

Kim RS,LaBella FS

doi

10.1016/s0022-2828(88)80025-7

subject

Has Abstract

pub_date

1988-02-01 00:00:00

pages

119-30

issue

2

eissn

0022-2828

issn

1095-8584

pii

S0022-2828(88)80025-7

journal_volume

20

pub_type

杂志文章

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