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用频率为1.06MHz,强度为30W/cm~2的连续聚焦超声直接辐照在体大鼠肝脏3min,术后常规饲养,分别于辐照后1d、7d和15d宰杀取材,做石蜡切片和冰冻切片。观察辐照后肝细胞形态结构和酸性磷酸酶、单胺氧化酶活性变化。结果表明:辐照后的肝组织出现坏死区、重损伤区、轻损伤区,各区细胞的形态结构均发生了不同程度的变化。两种酶反应在坏死区为阴性,重损伤区呈弱阳性,轻损伤区呈强阳性,而未损伤区呈中等阳性反应。本文以此为线索,讨论了超声损伤机制和酶在肝细胞的继发性损伤和修复过程中的作用。
Directly focused ultrasound with a frequency of 1.06 MHz and an intensity of 30 W/cm~2 was directly irradiated on the liver of rats for 3 min. The rats were routinely reared and slaughtered at 1 d, 7 d, and 15 d after irradiation to make paraffin sections and freeze. slice. The morphological structure of hepatocytes and the changes of acid phosphatase and monoamine oxidase activities after irradiation were observed. The results showed that the necrotic area, severely damaged area and lightly damaged area appeared in the irradiated hepatic tissue. The morphological structure of the cells in each area had changed to varying degrees. The two enzyme reactions were negative in the necrosis zone, weakly positive in the severely injured zone, strongly positive in the light lesion zone, and moderately positive in the undamaged zone. This article uses this as a clue to discuss the mechanism of ultrasonic damage and the role of enzymes in secondary injury and repair of hepatocytes.