Immune-enhancing activity comparison of sulfated ophiopogonpolysaccharide and sulfated jujube polysaccharide

The immune-enhancing activities of four sulfated polysaccharides, sOPSₜ, sOPS₈₀, sJPSₜ and sJPS₅₀ picked out in our previous researches, were compared taking four corresponding unmodified polysaccharides as control. In vitro experiment, the effects of eight polysaccharides on chicken peripheral lymphocyte proliferation were determined by MTT assay. The result displayed that four sulfated polysaccharides could significantly stimulate lymphocyte proliferation, their actions were significantly or numerically stronger than those of corresponding unmodified polysaccharides, sOPS₈₀ presented better efficacy. In vivo experiment, 300 14-day-old chickens were averagely divided into ten groups. The chickens except blank control (BC) group were vaccinated with Newcastle disease vaccine, repeated vaccination at 28 days old. At the same time of the first vaccination, the chickens in eight polysaccharides groups were injected respectively with 0.5ml (1mg) of eight polysaccharides, in vaccination control (VC) and BC group, with 0.5mL of physiological saline, once a day for three successive days. On days 7, 14, 21 and 28 after the first vaccination, the peripheral lymphocyte proliferation and serum ND antibody titer were determined. The result showed that four sulfated polysaccharides could significantly promote lymphocyte proliferation and enhance serum antibody titer. Their actions were significantly or numerically stronger than those of corresponding unmodified polysaccharides, sOPS₈₀ possessed the best efficacy. These results indicated that sulfation modification could enhance the immune-enhancing activity of OPS and JPS, sOPS₈₀ possessed the best efficacy and would be expected as a component drug of new-type immunopotentiator.