Bartholeyns J, Baudhuin P
Proc Natl Acad Sci U S A. 1976 Feb;73(2):573-6. doi: 10.1073/pnas.73.2.573.
A cross-linked dimer of pancreatic ribonuclease A (ribonucleate 3'-pyrimidino-olitonucleotidohydrolase, EC 3.1.4.22), at a 10 mg/liter concentration, blocks proliferation of tumor cells. The protein retains this ability after inactivation by iodoacetate. The cytostatic effect of ribonuclease preparations on various cell lines correlates well with their rate of uptake: for example, monomeric ribonuclease A is much less effective and is taken up into the cells 10 t0 15 times more slowly. Cell fractionation studies on hepatoma cells indicate accumulation of the dimer in the lysosomal system. Ribonuclease dimer induces a labilization of the lysosomes when added to cell homogenates, raising the possibility that its antitumoral effect may be mediated by endocytosis and lysosomes.
胰腺核糖核酸酶A(核糖核酸3'-嘧啶寡核苷酸水解酶,EC 3.1.4.22)的交联二聚体,浓度为10毫克/升时,可阻断肿瘤细胞的增殖。该蛋白质在被碘乙酸灭活后仍保留此能力。核糖核酸酶制剂对各种细胞系的细胞生长抑制作用与其摄取速率密切相关:例如,单体核糖核酸酶A的效果要差得多,进入细胞的速度要慢10到15倍。对肝癌细胞的细胞分级分离研究表明二聚体在溶酶体系统中积累。当将核糖核酸酶二聚体添加到细胞匀浆中时,会诱导溶酶体不稳定,这增加了其抗肿瘤作用可能由内吞作用和溶酶体介导的可能性。