Effects of inoculating Nogo66 vaccine on immunoresponse of rats / 解放军医学杂志

ABSTRACT

Objective To study immunoresponse of SD rats to different dosages of Nogo66 vaccine,and then select the best vaccination concentration.Methods Nogo-66 peptide vaccine plus complete and imcomplete Freund's adjuvant were prepared in concentrations of 50?g/300?l,100?g/300?l,200?g/300?l,400?g/300?l and 800?g/300?l.The vaccines of different concentrations were used to immunize SD rats weekly for 8 weeks,and either complete or imcomplete Freund's adjuvant alone was used as control.Blood was drawn from caudal vein of rats weekly after the first immunization,and the titer of serum special IgG antibody was measured by ELISA.Two animals of every group were sacrificed every four weeks,and the spleens were harvested,and erythrocytes were removed with hypotonic saline.The proliferation rate of the cultured spleen T cells was determined with MTT.Meanwhile the experimental autoimmune encephalomyelitis(EAE) was evaluated for all experimental animals.Results The antibody titer of serum specific IgG of all experimental groups elevated quickly since the 4th week after vaccination,and reached the top value at the 8th week,and it then kept stable for 10 weeks.The IgG antibody titer in 200?g/300?l group was significant higher than that in other experimental groups(P