胰岛素样生长因子对心力衰竭大鼠心肌细胞黏附分子1表达的影响

目的 观察胰岛素样生长因子干预对心力衰竭大鼠心肌细胞黏附分子-1(ICAM-1)表达的影响. 方法 应用异丙肾上腺素腹腔注射方法建立SD大鼠心力衰竭模型.大鼠随机分为对照组、心力衰竭组、血管紧张素转换酶抑制剂(ACEI)治疗组和胰岛素样生长因子-1(IGF-1)治疗组.应用生理记录仪检测大鼠血流动力学改变;分别应用放射免疫法和免疫组化法测定血管紧张素Ⅱ含量和大鼠心肌ICAM-1表达的改变. 结果 与模型组比较,ACEI和IGF-1改善心力衰竭大鼠血流动力学,降低异丙肾上腺素AngⅡ含量,抑制ICAM-1的表达.与ACEI组比较,IGF-1改善心力衰竭大鼠的血流动力学参数更加明显,另外,IGF-1降低AngⅡ的浓度(369.2±63.0)ng/L与(384.4±56.2)ng/L使ICAM-1(0.804±0.024与1.254±0.059)表达更加显著(P＜0.01). 结论 IGF-1可明显抑制心力衰竭大鼠心肌ICAM-1的表达,这可能与其抑制肾素-血管紧张素-醛固酮系统系统激活、降低AngⅡ有关.

Effect of insulin-like growth factor-1 on intercellular adhesion molecule-1 expression in rat model of congestive heart failure

Objective To investigate the effect of insulin-like growth factor-1 (IGF-1) on intercellular adhesion molecule-1 (ICAM-1) expression in rat model with congestive heart failure (CHF). Methods The model of CHF in male Sprague-Dawley rat was established using subcutaneous injection of isoproterenol. The rats were randomized into model group (n = 10),angiotensin converting enzyme inhibitors (ACEI) group ( n=10) and IGF- 1 group ( n = 10). The rats injected with saline were used as normal controls (n=10). The haemodynamic parameters of rats in each group were detected. The concentration of plasma angiotensin Ⅱ (Ang Ⅱ ) and expression of ICAM-1 in rat myocardium were determined by radioimmunoassay and immunohistochemistry,respectively. Results Compared with model group, ACEI and IGF-1 could rescue the diversities of hemodynamic parameters. In addition, ACEI and IGF-1 could also significantly down-regulated concentration of plasma Ang Ⅱ and inhibited ICAM-1 expression. Compared with ACEI, IGF-1 more significantly inhibited ICAM-I expression (0. 804 ± 0. 024 vs. 1. 254 ± 0. 059) and down-regulated concentration of plasma AngⅡ [(369.2±65.0) μg/L vs. (384.4±56.2) μg/L]. Conclusions IGF-1 can suppress ICAM-1 expression in rat model with CHF induced by isoproterenol. This effect may be related to inhibiting activation of RAS system.