Ruthenium red and caffeine affect the Ca2+-ATPase of the sarcoplasmic reticulum.

Abstract:

:Effects of ruthenium red and caffeine (a Ca2+ release blocker and an inducer, respectively) on Ca2+ uptake by sarcoplasmic reticulum (SR) vesicles and formation of the phosphorylated intermediate (EP) of the Ca2+-ATPase were studied using fast-kinetic techniques. Ruthenium red increased the rate and the maximum level of EP formation, while caffeine decreased both. Similarly, ruthenium red accelerated rapid Ca2+ uptake, while caffeine inhibited it. These drugs affected EP formation also with detergent solubilized Ca2+-ATPase. The concentrations required for half maximal effects on these functions (0.2 microM ruthenium red, 1.0 mM caffeine) are about the same as those for altering Ca2+ release. These results indicate that these reagents affect both the Ca2+-pump as well as the Ca2+ release mechanism, suggesting that the Ca2+-pump and Ca2+ release have some mechanisms in common.

authors

Mészáros LG,Ikemoto N

doi

10.1016/s0006-291x(85)80019-x

subject

Has Abstract

pub_date

1985-03-29 00:00:00

pages

836-42

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(85)80019-X

journal_volume

127

pub_type

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