Effects of isoflurane on voltage-dependent calcium fluxes in rabbit T-tubule membranes: comparison with alcohols.

Abstract:

:The effects of racemic (+/-) and (+)- and (-)-stereoisomers of isoflurane on depolarization-induced (45)Ca(2+) fluxes mediated by voltage-dependent Ca(2+) channels were investigated in transverse tubule membrane vesicles from rabbit skeletal muscle. In the concentration range 0.5 to 2 mM, (+/-)-isoflurane inhibited (45)Ca(2+) fluxes and functionally modulated the effects of the Ca(2+) channel antagonist nifedipine (1-10 microM). Isoflurane-induced inhibition of (45)Ca(2+) fluxes was not significantly affected by pretreatment with either pertussis toxin (5 microg/ml) or phorbol 12-myristate 13-acetate (50 nM). Further experiments indicated that there were no significant differences between (+)- and (-)-stereoisomers of isoflurane with respect to the extent of inhibition of (45)Ca(2+) fluxes. Radioligand binding studies indicated that racemic and (+)- and (-)-isoflurane were equally effective in displacing the specific binding of [(3)H]PN 200-110 to transverse tubule membranes. There were no apparent differences between the effects of (+)- and (-)-isoflurane on the characteristics of [(3)H]PN 200-110 binding. Although the concentrations of isoflurane for the inhibitions of (45)Ca(2+) fluxes and radioligand bindings were similar, the concentrations of n-alcohols required for the inhibition of (45)Ca(2+) fluxes were lower than those for the displacement of radioligand. Comparison of the data for the displacement of [(3)H]PN 200-110 binding and the inhibition of (45)Ca(2+) fluxes by isoflurane and by n-alcohols suggested that both isoflurane and n-alcohols may have more than a single binding site. In conclusion, results indicate that isoflurane, independent of intracellular Ca(2+) levels, nonstereospecifically inhibits the function of voltage-dependent Ca(2+) channels and this effect is mediated through multiple binding sites.

journal_name

Arch Biochem Biophys

authors

Oz M,Tchugunova Y,Dinc M,Dunn SM

doi

10.1006/abbi.2001.2726

subject

Has Abstract

pub_date

2002-02-15 00:00:00

pages

275-83

issue

2

eissn

0003-9861

issn

1096-0384

pii

S0003986101927262

journal_volume

398

pub_type

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