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The luminal Ca2+ transient controls Ca2+ release/re-uptake of sarcoplasmic reticulum.

Abstract：

:Our recent study (Saiki, Y., and Ikemoto, N., Biochemistry 38, 3112-3119, 1999) suggests that Ca2+ release and re-uptake of the released Ca2+ are coordinated. The following results suggest that the coordination is mediated by the luminal Ca2+ ([Ca2+]lum) transient. Upon inducing the release of the passively loaded Ca2+ from the SR with polylysine, the luminal Ca2+ ([Ca2+]lum) first increased then decreased ([Ca2+]lum transient). The activity of the SR Ca2+ ATPase was monitored at different times after inducing Ca2+ release. The phosphoenzyme (EP) formation as determined by the MANT-fluorescence increased concurrently with the initial rapid increase in the [Ca2+]lum. EP decay (pumping turnover) was accelerated concurrently with a decrease of the [Ca2+]lum. The results suggest that the [Ca2+]lum transient serves as a mediator for the acceleration of the Ca2+ re-uptake occurring soon after the induction of Ca2+ release.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Ikemoto N,Yamamoto T

doi

10.1006/bbrc.2000.4031

subject

Has Abstract

pub_date

2000-12-29 00:00:00

pages

858-63

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(00)94031-2

journal_volume

279

pub_type

杂志文章

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