3',5'-cAMP对不同瘤龄的艾氏腹水癌细胞内cAMP免疫荧光细胞化学反应及其磷酸二酯酶的细胞化学反应与癌细胞膜表面某些形态学变化的关系

IN VIVO EFFECT OF 3′,5′-cAMP ON EHRLICH ASCITES TUMOR CELLS AND THE CHANGES OF THE INTRACELLULAR 3′,5′-cAMP,cAMP-PDE ACTIVITY AND THE CHANGES OF MICROVILLI IN THESE TUMOR CELLS

本工作用外源性cAMP加氨茶碱对小鼠艾氏腹水癌细胞进行了多方面的研究,观察到外源性3′,5′-cAMP不仅对小鼠艾氏腹水癌细胞增殖有显著的抑制作用。在接种后第9天,看到癌细胞增殖受到抑制的同时,大多数癌细胞胞质内的cAMP免疫荧光细胞化学反应增强,癌细胞内3′,5′-cAMP磷酸二酯酶(PDE)活性受到抑制,此外,还观察到某些癌细胞表面膜上微绒毛消失或变短以及对植物凝集素的凝集反应减弱等现象,这些癌细胞的逆转表现的变化均与不同瘤龄的癌细胞有关,如经外源性cAMP处理后,cAMP-PDE活性降低出现的最早,均在接种后5~7天时最为明显,cAMP免疫荧光细胞化学反应是在接种后第9天最为显著,癌细胞表面膜上的微绒毛消失和变短的细胞比数明显增多,对植物凝集素的凝集反应减轻都是在接种后7~9天时最为显著,而cAMP对小鼠艾氏腹水癌细胞的增殖抑制作用是在接种后第9~11天最为明显。根据上述实验结果,本文讨论了外源性cAMP加氨茶碱对腹水癌细胞的抑制作用和癌细胞内cAMP荧光反应,3′,5′-cAMP-PDE活性以及癌细胞表面膜上微绒毛形态学变化的因果关系。

This experiment was carried out in young adult albino mice,which were injectedwith Ehrlich ascites tumor cells intraperitoneally to produce Ehrlich ascites tumor.The animals were divided into 2 groups.The first group received cAMP plusaminophylline for 5 to 13 days after inoculation.The second group received saline ascontrol.We found that in the administration of cAMP together with aminophylline,thegrowth of Ehrlich ascites tumor cells was inhibited to the extent of 53%at the 9thdays after inoculation.Early or later than the 9th day,the inhibitory rates were marklylower.By using cAMP immunocytochemical method,it was found that on the9th day of inoculation,there was an increase of the intensity of intracellualr cAMPspecific fluorescence in tumor cells of the cAMP treated mice in comparison withthose of the control.It also inhibited the 3’,5’-cAMP-PDE activity on the 5th to 7thday after inoculation.Under the dark field microscope on the surface of the Ehrlich tumor cells therewere numerous“brush-like”microvilli,but they were not visible on the surfaceafter treated with cAMP together with aminophylline.The agglutination by theCon.A,was decreased markly on the 7th to 9th day after the inoculation.The possible relationship between the level of intracellular cAMP and of the3’,5’-cAMP-PDE,and especially the inhibition of the formation of microvilli onthe treated tumor cell surface is discussed in this paper.