Calpain activity of hypertrophic hearts from hypertensive rats
Braz. j. med. biol. res
; 28(6): 621-5, Jun. 1995. tab, graf
Artigo
em Inglês
| LILACS
| ID: lil-154928
Biblioteca responsável:
BR1.1
RESUMO
Heart tissue contains large amounts of the Ca²+ -activated protein-ase calpain which has been assigned a specific function in the turnover of muscle protein. The objective of the present study was to determine calpain (E.C. 3.4.22.17)-like activity in homogenates of left ventricle from hypertensive rats that developed ventricular hypertrophy. Calpain activity was assayed using heat-denaturated azocasein as a substrate in the presence of 1 mM calcium and corrected by subtraction of the Ca²+ -independent activities. Tha latter were measured in the presence of 1 mM EGTA and the products read at 440nm. Male Wistar rats (225g) were assgned to control (N=8, normal drinking water), salt (N=6, drinking water containing 1 percent NaCl) and DOCA-salt (N=6, deoxycorticosterone acetate, 8 mg/Kg, sc, twice a week for 20 days plus drinking water containing 1 percent NaCl) groups. SHR (N =6, spontaneously hypertensive rats) were also used. The calpain activity of the control group was at 3.90 ñ 0.22 mU/g wet weight tissue. Hypertension induced significant left ventricular hypertrophy in DOCA-salt rats (26 percent) and in SHR (54 percent) and a 30 percent decrease in calpain activity in both groups (P < 0.01). In the high salt load (salt group) calpain activity was also decreased, but this was not accompanied by hypertrophy...
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Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Calpaína
/
Hipertrofia Ventricular Esquerda
/
Desoxicorticosterona
Limite:
Animais
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
1995
Tipo de documento:
Artigo
/
Congresso e conferência