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弥散流失
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Fortyfour male Kunming mice, weighing 20-25g. were used. The HpD was injected (10mg/kg) into the caudal vein of 32 mice individually. After 48 hours, the kidneys were radiated directly by the dye-laser for 10 minutes (630nm, 250-300J/cm~2). Then, the kidneys were observed at different times. 12 normal male mice served as control. The experiment demonstrated that when HpD was activated by laser, it could produce the necrotic effect on the renal tissues. The different structures of the kidney showed different...

Fortyfour male Kunming mice, weighing 20-25g. were used. The HpD was injected (10mg/kg) into the caudal vein of 32 mice individually. After 48 hours, the kidneys were radiated directly by the dye-laser for 10 minutes (630nm, 250-300J/cm~2). Then, the kidneys were observed at different times. 12 normal male mice served as control. The experiment demonstrated that when HpD was activated by laser, it could produce the necrotic effect on the renal tissues. The different structures of the kidney showed different susceptibility to HpD-laser. The proximal convoluted tubules and capillaries were injured earlier than the distal convoluted tubules and the collecting tubules. The first morphologic changes observed electron microscopically were the swelling of mitochondria and the formation of vesicles on the cell membrane. Finally, they were completely disrupted. The damages of lysosomes, endoplasmic reticula, ribosomes and cell nucleus followed. The activity of some enzymes in the kidney were inhibited. The sequence of the extents of the enzymes being inhibited was AkP, AcP, Cytox, SDH. The mucopolysaccharides ran off the brush border in proximal convoluted tubules. The results of this study suggested that the various susceptibilities to HpD-laser are chiefly due to the different structures and their functional conditions in the kidney. The main photodynamic effect is presented as the injury of the membrane system of the cell.

用雄性昆明小鼠44只,经尾静脉注入HpD(10 mg/kg),48 h后,用剂量为250~300 J/cm~2、波长为630 nm的激光照射肾脏局部,即可发生光动力学肾组织损伤。其中近端小管、间质毛细血管和血管球受损早;远端小管、集合管损伤发生较晚,但很快也发生不可逆的坏死性改变。光照后线粒体和细胞膜即刻发生改变,随之溶酶体、内质网、核糖体和细胞核相继受损。酶受到抑制,其程度为:AlP>AcP>Cytox>SDH。粘多糖弥散流失。实验结果表明,肾脏的不同部位因结构和功能的差异,决定了HpD吸收量及其对光动力作用的敏感程度;血卟啉光动力学作用的靶部位主要是细胞的膜系统,导至膜结构的改变和功能异常。

 
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