氟硒镉对大鼠体内抗氧化酶及微量元素的影响

目的　探讨氟硒镉对大鼠各组织中脂质过氧化物 (LPO)含量和谷胱甘肽过氧化物酶 (GSH Px)活性以及镉硒锌等微量元素含量的影响。方法　采用SD大鼠经饮水染毒 8周 ,实验结束时处死动物测定各组织中LPO和谷胱甘肽过氧化物酶及镉硒锌的含量。结果　氟、硒、镉实验组均可见大鼠血清、肝、肾组织中GSH Px含量与对照组比呈显著降低 ,LPO含量量呈显著增高。其中任意二元素联合组较氟、硒、镉组GSH Px的含量呈明显回升 ,LPO含量量呈明显降低 ,而氟 +硒 +镉组其升高与降低的作用则更明显 ,以至GSH Px、LPO的水平几乎和对照组相同。过量硒和镉能导致肾硒、肝镉成数倍的增长。氟、镉可引起各组织中硒、锌的缺乏 ,硒则可使肝、肾中锌水平普遍提高。氟 +硒、镉 +硒以及氟 +硒 +镉联合可减少肾硒、肝镉的蓄积 ,同时也可减少氟、镉所致锌的损失。结论　提示过量的氟、硒、镉均可促进动物体内脂质过氧化作用增强 ,并抑制GSH Px的活性 ,使机体抗氧化能力降低。但当其中二或三种化学元素共存时 ,可减轻各自所引起的脂质过氧化作用以及对GSH Px的活性的抑制作用 ,同时减轻镉硒在体内的蓄积和氟镉所致引起体内锌水平的降低。

Effect of fluorine,selenium and cadmium on anti-oxidase and microelements in rat's body

Objective To study the effect of fluorine, selenium and cadmium on lipid peroxide(LPO),the activity of glutathione peroxidase (GSH Px) and microelements such as cadmium, selenium and zinc in rats. Methods Measurement of the contents of LPO, GSH Px and microelements such as cadmium, selenium and zinc in SD rats after killing that have drunk water containing fluorine, selenium and cadmium eight week ago. Results The contents of GSH Px in the serum, liver and kidney of rats that were contaminated with fluorine, selenium and cadmium respectively remarkably reduced and the content of LPO noticeably increased in comparison with those of rats without being contaminated. The contents of GSH Px noticeably increased and LPO remarkably reduced in those contaminated with the combination of any two of the three elements when compared with those in the rats contaminated with any one element of them, while the contents of GSH Px in those contaminated with the combination of the three elements increased even more. Excessive selenium or cadmium led to the increase of selenium content in kidney and cadmium content in liver by several times. Excessive fluorine or cadmium gave rise to the lack of selenium and zinc. Selenium brought out universal increase of zinc in liver and kidney. The combination of fluorine and selenium or the combination of cadmium and selenium or that of fluorine, selenium and cadmium produced remarkable decrease of the accumulation of selenium in kidney and cadmium in liver. They also lowed the loss of zinc caused by fluorine or cadmium. Conclusion Excessive fluorine, selenium or cadmium could inhabit the activity of GSH Px in rats, which could diminish the antioxidation ability of the body. But when two or three of the chemical elements coexisted, they reduced the inhabitation of each of them on the activity of GSH Px and in the meantime decreased the accumulation of cadmium and selenium and diminished the loss of zinc caused by fluorine and cadmium.