The radioprotective activity has been studied of a new immunomodulatory lead material, Cumaside, which is a complex of monosulfated triterpene glycosides from the edible sea cucumber Cucumaria japonica and cholesterol. Female CD-1 strain mice administered with prophylactic doses of Cumaside were irradiated using a Gamma-therapeutic device with a 60Co source (exposure dose 6.5 Gy, dose rate 1.14 Gy /min) and the average life span of the mice was determined. The animals administrated with Cumaside and irradiated were killed by pervisceral dislocation on days 4 and 9. Peripheral blood cell composition indexes, blood forming function and cell number in blood-forming organs and the number of pluripotent blood-forming stem cells were determined using standard procedures and the results compared with those of non-treated irradiated mice. The survivability percentage and average life span of the irradiated mice that were not treated with Cumaside were decreased in comparison with the Cumaside-treated groups. Especially, the leukocyte and neutrophil numbers in the blood (bone marrow from hip), and the weight and cell number of lymphoid organs were higher in the Cumaside-treated groups compared with the non-treated irradiated mice. It was concluded that at low prophylactic doses Cumaside possesses moderate radioprotective properties.
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