Haematopoiesis radioprotection in Balb/c mice by an aqueous mycelium extract from the Basidiomycete Pleurotus ostreatus mushroom

摘要

The study examined the radioprotective activity of an aqueous extract from Pleurotus ostreatus mycelium administered to Balb/c mice. Male mice were whole-body irradiated on day 0 (Co-60, at 0.43Gy/min) and divided into two groups. The extract was administered intraperitoneally to one group (100mg/kg) on days -10 to -6 and -2 to +1 with respect to the irradiation. The irradiated-control group was injected with saline solution; non-irradiated mice were used as negative controls. The radioprotective effect was evident by increases in bone marrow cellularity (5.1x10(6)/femur vs. 1.1x10(6)/femur in saline-control mice, p<0.05), leucocyte counts (10.5x10(9)/L vs. 4.5x10(9)/L, p<0.05), and spleen cellularity (11.2x10(7)/spleen vs. 6.2x10(7)/spleen, p<0.05). The extract stimulated macrophage phagocytic activity as judged by a faster rate of carbon clearance in terms of absorbance ratios (1.62 vs. 2.01, p<0.05). Therefore, this extract may be a candidate therapeutic agent with radioprotective activity for haematopoiesis damage, particularly to cells involved in immune function.