Androgen regulation of the nicotinic acetylcholine receptor-ionic channel in a hormone-dependent skeletal muscle
Braz. j. med. biol. res
; 24(10): 1051-4, 1991. ilus, tab
Artigo
em Inglês
| LILACS
| ID: lil-102087
Biblioteca responsável:
BR1.1
ABSTRACT
The trophic influence of testosterone on the nicotinic acetylcholine receptor-ionic channel (AChR) was studied in the levator ani (LA) muscle of adult malr rats (120 days) intact (C) or gonadectomized when 90 days old (G). In the indirectly elicited muscle twitch, the LA from G rats was less sensitive to d-tubocurarine (0.1-1µM) than control muscles (IC25:C = 0.30µM,G=0.46µM). In G rats, the amplitude of neurally evoked endplate currents (EPC) was reduced by 70%, but the EPC time constant was not changed. Maximal junctional binding of [125I] alfa-bungarotoxin in the LA(C: 72.5 ñ 13.2 amol/endplate) was reduced by 18.8-fold in LA from G rats, with no change of the association rate constant (C: 5.64 ñ 1.29 10**6 M-1 min**-1). The results indicate that testosterone deprivation reduces the junctional AChR density in the rat LA without modifying the binding properties of the receptor
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Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Testosterona
/
Receptores Colinérgicos
/
Placa Motora
/
Músculos
Limite:
Animais
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
1991
Tipo de documento:
Artigo
/
Congresso e conferência