高糖对去甲肾上腺素诱导的心肌细胞肥大的促进作用

Accelerating effects of high glucose on NE-induced cardiac hypertrophy of the cultured myocardial cells

目的 利用体外培养的乳鼠心肌细胞 ,观测高浓度葡萄糖对去甲肾上腺素诱导的心肌细胞肥大的影响 ,根据所得结果来推测高糖与心肌细胞肥大之间的相互关系及可能作用机制。方法 以培养的乳鼠心肌细胞为模型分组给药后 ,用Lowrys法测心肌细胞的蛋白质含量 ;用消化分离法 ,利用计算机图像分析系统测心肌细胞的体积 ;用 [3 H]leucine标记法测定心肌细胞蛋白的合成。结果 与对照组相比 ,高糖组心肌细胞蛋白含量、体积、蛋白合成均有明显增加 ,NE组心肌细胞蛋白含量、体积、蛋白合成增加更为明显 ;而与高糖组或NE组相比较 ,高糖加NE组心肌细胞蛋白含量、体积、蛋白合成增加则最为显著。结论 单纯高糖培养可明显促进心肌细胞肥大 ,同时高浓度葡萄糖可在去甲肾上腺素诱导的心肌细胞肥大的基础上促使其进一步肥大 。

AIM To study the effects of high glucose on the cardiac hypertrophy,cultured cardiomyocytes were used to study the accelerating effects of high glucose on norepinephrine(NE) induced cardiac hypertrophy. METHODS Using cultured myocardial cells as a model, the cellular hypertrophy was observed. The protein content was assayed with Lowrys method. The cardiomyocytes' volumes was measured by computer photograph analysis system. The protein synthesis was assayed with leucine intake method. RESULTS The total cellular protein content?cellular volumes?cellular protein synthesis showed an increase in high glucose group, NE group, high glucose and NE group compared with control group, respectively. High glucose and NE group showed a further increase compared with NE group. CONCLUSIONS The high glucose itself induced hypertrophy of the cultured myocardial cells slightly. Meanwhile high glucose can further accelerate hypertrophy of the cultured myocardial cells induced with NE. The effective mechanism between high glucose and NE on cardiac hypertrophy need further study.