The cardioprotective effects of ischemic postconditioning on myocardial interstitium following ischemic/reperfusion in rats / 中国应用生理学杂志
Chinese Journal of Applied Physiology
;
(6): 431-435, 2014.
Artigo
em Chinês
| WPRIM
| ID: wpr-243468
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the effects of ischemic postconditioning (IPTC) on the changes of matrix metalloproteinases-2 (MMP-2) and tissue inhibitor of metalloproteinase-2 (TIMP-2) protein and mRNA levels in rat heart subjected to ischemia/reperfusion, and explore the mechanism by which IPTC protects myocardial interstitium following ischemic/reperfusion (I/R).</p><p><b>METHODS</b>Twenty four healthy male SD rats were randomly divided into 3 groups (n = 8) sham control (SC) group, I/R group and IPTC group. The parameters of left ventricular function including left ventricular systolic pressure (LVSP) and its derivate (±dp/dt) were measured; the amount of myocardial collagen contents was determined by hydroxyproline quantification; the plasma activity of creatine kinase (CK) and lactate dehydrogenase (LDH) was detected; the protien levels of MMP-2 and TIMP-2 was measured by Western blot and the mRNA levels of MMP-2 and TIMP-2 was detected by real-time PCR.</p><p><b>RESULTS</b>The myocardial collagen contents, left ventricular function and the protein and mRNA levels of TIMP-2 were significantly decreased in I/R group compared with those of SC group, wherease the activities of CK and LDH in the plasma and the protein and mRNA levels of MMP-2 were significantly enhanced in I/R group when compared to SC group. Compared with I/R group, the myocardial collagen contents, left ventricular function and the protein and mRNA levels of TIMP-2 were increased in IPTC group, the activities of CK and LDH in the plasma and the protein and mRNA level of MMP-2 were decreased in IPTC group.</p><p><b>CONCLUSION</b>These findings indicate that IPTC has protective effects on myocardial interstitial after the myocardial ischemia/reperfusion injury, and IPTC may exert its cardioprotectve effect via inhibiting MMP-2 and enhancing TIMP-2 expression in cardiac muscle.</p>
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Traumatismo por Reperfusão Miocárdica
/
Função Ventricular Esquerda
/
Colágeno
/
Ratos Sprague-Dawley
/
Inibidor Tecidual de Metaloproteinase-2
/
Creatina Quinase
/
Metaloproteinase 2 da Matriz
/
Pós-Condicionamento Isquêmico
/
Reação em Cadeia da Polimerase em Tempo Real
/
Metabolismo
Limite:
Animais
Idioma:
Chinês
Revista:
Chinese Journal of Applied Physiology
Ano de publicação:
2014
Tipo de documento:
Artigo
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