Reversible blockade of the calcium-activated nonselective cation channel in brown fat cells by the sulfhydryl reagents mercury and thimerosal.
Pflugers Arch
; 425(5-6): 549-51, 1993 Dec.
Article
en En
| MEDLINE
| ID: mdl-7510880
ABSTRACT
We have used patch-clamp techniques to study the effect of the sulfhydryl group oxidizing agents mercury and thimerosal on calcium-activated nonselective cation channels from brown adipose tissue. 100 nmol/l mercury and 50 mumol/l thimerosal induced a complete block. Blockade could be reversed by reduction of the mercaptide by dithiotreitol (DTT). Mercury was found to be the most potent blocker (IC50-value 21 x 10(-9) mol/l), whereas thimerosal (IC50-value 1.5 x 10(-6) mol/l) was as effective as 3',5-dichlorodiphenylamine-2-carboxylic acid (DCDPC). The DCDPC effect, however, could not be reversed by DTT, indicating different blocking mechanisms. It is concluded that SH-groups are involved in gating of the calcium-activated nonselective channel.
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Banco de datos:
MEDLINE
Asunto principal:
Timerosal
/
Tejido Adiposo Pardo
/
Cationes
/
Calcio
/
Canales Iónicos
/
Mercurio
Límite:
Animals
Idioma:
En
Revista:
Pflugers Arch
Año:
1993
Tipo del documento:
Article
País de afiliación:
Suecia