首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Potential role of the membrane in the development of intestinal cellular damage after whole-body gamma irradiation of the rat.
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Potential role of the membrane in the development of intestinal cellular damage after whole-body gamma irradiation of the rat.

机译:膜在大鼠全身γ射线照射后肠细胞损伤发展中的潜在作用。

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摘要

Our study emphasizes the effect of gamma irradiation on intestinal cell membrane fluidity and addresses the potential relationships existing between radiation-induced lipoperoxidation, membrane fluidity, and changes in membrane protein activities. Male Wistar rats were exposed to an 8-Gy total body irradiation (60Co source) and studied 1, 4, and 7 days after irradiation (D1, D4, and D7). Membrane enzyme activities and fluorescence anisotropy were determined on small intestinal crude membrane preparations. The supernatants of membrane preparations as well as plasma were used for malonedialdehyde (MDA) quantification. The effect of carbamylcholine on electrical parameters was estimated on distal ileum placed in Ussing chambers. We observed a decrease in fluorescence anisotropy for at least 7 days, an increase in membrane production of MDA at D4, a decrease in membrane enzyme activities at D4, but an amplification of carbamylcholine-induced increase in short-circuit current at D4 and D7. Furthermore, correlations were observed between the 1,6-diphenyl-1,3,5-hexatriene anisotropy coefficient and sucrase activity and between MDA levels and leucine aminopeptidase activity. Thus, total body irradiation induces changes in intestinal membrane fluidity and an increase in lipoperoxidation. These modifications may have an impact on the activity of membrane proteins involved in intestinal function.
机译:我们的研究强调了γ射线辐照对肠细胞膜流动性的影响,并探讨了辐射诱导的脂过氧化,膜流动性和膜蛋白活性变化之间存在的潜在关系。将雄性Wistar大鼠暴露于8-Gy全身辐照下(60Co辐射源),并在辐照后第1、4和7天(D1,D4和D7)进行研究。在小肠粗膜制剂上测定膜酶活性和荧光各向异性。膜制剂的上清液和血浆用于马龙二醛(MDA)定量。氨基甲酰胆碱对电参数的影响是在放置于Ussings室的回肠远端进行估计的。我们观察到荧光各向异性至少降低了7天,D4处MDA的膜产量增加,D4处的膜酶活性降低,但氨甲酰胆碱引起的D4和D7短路电流增加了。此外,在1,6-二苯基-1,3,5-己三烯各向异性系数与蔗糖酶活性之间以及MDA水平与亮氨酸氨肽酶活性之间观察到相关性。因此,全身照射引起肠膜流动性的改变和脂过氧化的增加。这些修饰可能会影响肠功能中涉及的膜蛋白的活性。

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