Abstract: Undaria pinnatifida dietary fiber(Up-df)was fed to BALB/C mice.Then the mice were executed and assayed for delayed type hypersensitivity(DTH)induced by 2,4-dinitrofluorobenzene(DNFB),hemolysin formation,the carbon particle clearance index K,phagocytic indexα,T cell subsets,lyre phocyte proliferation,natural and killer(NK)cell cytotoxicity.It was found that the administration of Up-df enhances the carbon particle clearance index K,and phagocytic indexαof normal mice, as well as DTH induced by DNFB,hemolysin formation,the carbon particle clearance index K,phagocytic indexα,T cell subsets, lyre phocyte proliferation,and NK cell cytotoxicity in immune-deformed mice.It suggested that the intake of Up-df can partly rejuvenate the immune reactivity of the immune-deformed mice.

Key words: Undaria pinnatifida, dietary fiber, immune function