Abstract
As part of a series of studies on the bioactivities and structures of polysaccharides from Dendrobium officinale, this study investigates the immunomodulatory activities of Dendrobium officinale and its two polysaccharide fractions (crude and purified, respectively) in cyclophosphamide induced mice. All three materials protected the body from immunosuppression in a dose-dependent manner. Biological activities related to immunomodulations investigated included stimulating the proliferation of splenocytes, balancing the ratio of spleen lymphocyte subsets and the secretion of serum cytokines, up-regulating the serum IgM, IgG and haemolysin formation, and accelerating the phagocytotic function of peritoneal macrophage. The degree of modulations were higher in purified Dendrobium officinale polysaccharide than crude polysaccharide, indicating that the purified polysaccharide was one of the key bioactive components in Dendrobium officinale, the main structure of which has been identified as O-acetyl-glucomannan (Dendronan)
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