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Possible involvement of actin and myosin in Ca2+ transport through the plasma membrane of chromaffin cells.

Abstract：

:The exocytosis of catecholamines by chromaffin cells following stimulation (e.g. by acetylcholine) is accompanied by a rise in the level of intracellular free Ca2+. Actually, secretion can be induced merely by making the cells leaky to Ca2+ from the external medium. We have recently demonstrated that secretion can be increased by the introduction of DNase-I, the F-actin depolymerizing agent, or of heavy meromyosin, the enzymatically active fragment of myosin. Suspecting that these changes might be associated with a higher intracellular level of Ca2+, we now have measured the influx of 45Ca2+ into chromaffin cells which have undergone fusion with DNase-I- or with heavy meromyosin-loaded liposomes. In both cases, a marked increase in Ca2+ uptake has been observed, which could be abolished by Co2+ ions (a Ca2+ channel blocker), suggesting an intimate involvement of the cellular actomyosin system in the process of Ca2+ ions transport through the Ca2+ channels of the plasma membrane.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Harish OE,Levy R,Rosenheck K,Oplatka A

doi

10.1016/s0006-291x(84)80299-5

subject

Has Abstract

pub_date

1984-03-15 00:00:00

pages

652-6

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(84)80299-5

journal_volume

119

pub_type

杂志文章

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