Four triterpene glycosides from sea cucumbers belonging to the genus Cucumaria, okhotoside A1-1 (1), cucumarioside A0-1 (2), frondoside A (3) and cucumarioside A2-2 (4) inhibit the activity of nonspecific esterase of mouse spleen lymphocytes. The dependence of the inhibitory activity of the glycosides on their structure is similar to that for hemolytic activity. The absence of inhibitory activity for the preparation Cumaside, which is a complex of cucumarioside A2-2 and related compounds with cholesterol, shows a cholesterol-dependent character of the inhibitory action of the glycosides. The effective inhibitory concentrations of frondoside A and cucumarioside A2-2 are significantly higher than the immunomodulatory doses of these glycosides.
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