小鼠艾氏腹水癌血清MDA与癌细胞腺苷酸环化酶及cAMP变化的相关研究

The study of the possible correlation between the MDA and adenylate cyclase or cAMP of Ehrlich's ascites cancer

本文利用BALB/C纯种小鼠复制艾氏腹水癌(EAC),分别检测EAC荷瘤鼠早期,中期和晚期血消丙二醛(MDA),血浆、癌细胞内cAMP和癌细胞膜腺苷酸环化酶(AC)活力,并与正常鼠比较,在寻找各自变化规律的基础上,探讨其相互关系。结果发现,EAC荷瘤鼠血清MDA比正常鼠明显增高,且随病情的发展而不断增高,而EAC荷瘤鼠血浆cAMP比正常鼠明显降低,随病情发展不断下降。两者呈高度负相关(P<0.01)。癌细胞cAMP和AC活力的变化规律及与血清MDA关系与血浆cAMP相似。提示自由基可能通过损伤-SH,降低AC活力和使能量代谢障碍而致癌细胞内的cAMP下降。

Ehrlich's ascites cancer (EAC) in BALB/C mice by ip transplantable EAC cell is reproduced by us. The change of serum malondialdehyde(MDA), plasma cellular cAMP and adenylate cyclase (AC) are examined in the early, middle and late phase of mice bearing EAC respectively in comparison with that of control group. Results indicate that serum MDA in mice bearing EAC is continuously increased with the progress of the disease in the remarked ways in comparison with the control group. Whereas the plasma cAMP in the mice bearing EAC is markedly decreased in that order. Relation between the change of serum MDA and the cellular cAMP, AC or plasma cAMP shows a significant negative correlation efficiency (P<0.01). The decrease of cellular cAMP might be resulted from the enjury of SH-group dependent AC activity by free redicals on cellular membrane, or by the activation of cAMP-PDE in turn with the involvement of energy metabolism has been suggested by us.