亚硝酸盐对培养心肌细胞的直接作用

应用亚硝酸钠作用于培养的心肌细胞，观察到心肌细胞发生了超微形态结构改变；细胞内α－羟丁酸脱氢酶漏出增加（Ｐ＜０．０５～０．０１），３Ｈ—ＴｄＲ掺入变化呈双向性：小剂量组（０．００１～０．１×１０－６ｍｏｌ／Ｌ）呈现促进作用（Ｐ＜０．０５～０．０１）；大剂量组（１．０×１０－６ｍｏｌ／Ｌ）则表现为抑制效应（Ｐ＜０．０５）。细胞周期分析结果：小剂量组（０．０１×１０－６ｍｏｌ／Ｌ）Ｇ０Ｇ１期细胞减少４．１３％，Ｓ期增长３．９５％，Ｇ２＋Ｍ期增长０．３３％，与对照组比较，无显著性差异（Ｐ＞０．０５）。大剂量组（１、０×１０－６ｍｏｌ／Ｌ）Ｇ０Ｇ１期细胞增加９．１４％，Ｓ期减少１２．４６％，Ｇ２＋Ｍ期增加４．０６％，其中Ｓ期的改变达到显著差异（Ｐ＜０．０５）；细胞及培养液中脂质过氧化物含量增加（Ｐ＜０．０１）。表明亚硝酸盐能引起培养心肌细胞的直接损伤，其机理与脂质过氧化作用有关。

Effect of sodium nitrite on cultured cardiac cells

The effect of sodium nitrite (NaNO2 )on cultured cardiac cells in neonatal rats was investigated. The results showed that NaNO2 might cause injuries in the cardiomyocyted:cell contraction,myofibril fragmentation,disorder of biomembrane system,increase of leakage of intracellular a-HBDH and accumulation of lipid peroxide with in the cells. The incorporation of H-TdR was of bidirectional:small dose of NaNO2 appeared stimulative, while large dose appeared inhibitory effect. Cell cycles analysis showed changed percentage of G0G1,and S phases. These findings indicate that NaNO2 may produce the direct injurious effects on the cultured cardiac cells, which is related to lipid peroxidation.