EFFECTS OF TWO ACIDIC MUCOPOLYSACCHARIDES FROM SEA CUCUMBERS ON THE INTERACTION OF THROMBIN WITH ENDOTHELIAL CELLS / 中国药理学通报

SJAMP and HLAMP are glucose-containing acidic mucopolysacc-harides isolated from sea cucumbers, Stichopus Japonicus and Holot-huria Lecospilota respectively. Their effects on the interaction of thrombin with endothelial cells were studied. Human vascular endothelial cells isolated from umbilical veins treated with 0.1% collagenasc were cultured with MEM medium. The contents of von Willebrand factor (vWF) and 6-keto-PGFla, stable hydrolysis product of PGI,, in the culture medium were measured with ELISA and immunoradioassay technique. The addition of thrombin to confluent monolayer endothelial cells resulted in a significant increase in the release of vWF and 6 ~ keto-PGFla in the culture medium. When heparin,SJAMP or HLAMP was added, no significant amount of vWF or 6~keto-PGFla could be detected in the medium .Whereas preincubation of thrombin with heparin, SJAMP or HLAMP respectively inhibited the thrombin-induced vWF and 6-keto-PGF 10 release and this effect was well correlated with the dose of heparin, SJAMP or HLAMP, indicating that SJAMP, HLAMP as well as heparin had inhibitory effect on the interaction of thrombin with endothelial cells

RAD1OIMMUNOASSAY FOR TXA2 AND PGi IN EXPERIMENTAL INVESTIGATIONS ON THROMBOSIS / 解放军医学杂志

TxB2 and 6-keto-PGF1 alpha were determined in healthy persons, and their concentrations in plasma were 127?48 pg/ml(n = 40) and 138?77.9pg/ml(n = 36), respectively. We found that 6-keto-PG-F1 alpha levels in 156 specimens of the normal endomctriums elevated during secretive period, and the TxB2 also increased markedly during the menstrual period. Experimental DIC was induced by constant infusion of thrombin and EACA into the ear vein of the rabbits, and TxB2 and 6-keto-PGF1 alpha levels were increased at once in such instances. In 14 cases undergoing extracorporeal circulation, TxB2 was obviously enhanced during bypass and reached a peak value at 10 minutes of bypass, and then returned to the preopcrative level 2-4 hours after bypass, but there were no remarkable changes in 6-keto-PGF, alpha levels during bypass. The experimental results were discussed in the paper.