茯苓多糖PCP-Ⅰ和PCP-Ⅱ作为疫苗佐剂的免疫原性

摘要

目的 研究茯苓多糖(PCP)中PCP-Ⅰ和PCP-Ⅱ作为疫苗佐剂的免疫原性.方法 ①采用钥孔戚血蓝蛋白(KLH)和牛血清白蛋白(BSA)为载体蛋白分别与PCP-Ⅰ或PCP-Ⅱ连接制备免疫抗原KLH-PCP-Ⅰ和KLH-PCP-Ⅱ及筛选抗原BSA-PCP-Ⅰ和BSA-PCP-Ⅱ.KLH-PCP-Ⅰ和KLH-PCP-Ⅱ分别与弗氏佐剂联用id免疫家兔2次,ELISA检测家兔血清中抗多糖抗体.②PCP-Ⅰ或PCP-Ⅱ单独im免疫小鼠2次,ELISA检测小鼠血清中抗多糖抗体.③PCP-Ⅰ或PCP-Ⅱ为佐剂分别配伍重组乙肝病毒表面抗原(HBsAg)和猪繁殖与呼吸综合征病毒灭活疫苗(PRRSV)im或sc免疫小鼠2次,ELISA检测小鼠血清中抗多糖抗体.结果 ①KLH-PCP-Ⅰ或KLH-PCP-Ⅱ与弗氏佐剂联用免疫2次,可产生抗KLH和抗多糖抗体.②PCP-Ⅰ或PCP-Ⅱ单独im免疫小鼠2次,检测出低水平IgM抗体,未检测出IgG抗体.③HBsAg或PRRSV抗原联用PCP-Ⅰ或PCP-Ⅱ免疫小鼠2次,未检出抗多糖IgG抗体.结论 PCP-Ⅰ和PCP-Ⅱ本身免疫原性较弱,作为疫苗佐剂可能具有良好的安全性.%OBJECTIVE To investigate the immunogenicities of Poria cocos polysaccharides, PCP-Ⅰand PCP-Ⅱ, as a vaccine adjuvant. METHODS ①Keyhole limpet hemocyanin (KLH) was linked to PCP-Ⅰor PCP-Ⅱrespectively to prepare immuno-antigen KLH-PCP-Ⅰor KLH-PCP-Ⅱ. Bovine serum albumin (BSA) was also linked to PCP-Ⅰor PCP-Ⅱrespectively to prepare screening-antigen. Rabbits were immunized with KLH-PCP-Ⅰor KLH-PCP-Ⅱplus Freund adjuvant by intradermal injection twice, and serum specific antibody titers were determined by ELISA. ②BALB/c mice were immunized with PCP-Ⅰ or PCP-Ⅱ alone intramuscularly twice, and serum polysaccharide antibody titers were determined by ELISA.③BALB/c mice were co-immunized intramuscularly or subcutaneously with PCP-Ⅰor PCP-Ⅱplus hepatitis B surface antigen (HBsAg) or porcine reproductive and respiratory syndrome virus inactivated vaccine (PRRSV) twice, and serum polysaccharide-antibody titers were determined by ELISA. RESULTS ①Serum anti-KLH and anti-polysaccharides (PCP-Ⅰor PCP-Ⅱ) antibodies were pro?duced after rabbits were immunized with KLH-PCP-Ⅰor KLH-PCP-Ⅱplus Freund adjuvant twice.②Serum anti-PCP-Ⅰor anti-PCP-Ⅱantibodies were not found after mice were immunized with PCP-Ⅰand PCP-Ⅱalone twice.③After mice were immunized with HBsAg or PRRSV plus PCP-Ⅰor PCP-Ⅱtwice, serum anti-PCP-Ⅰor anti-PCP-Ⅱantibodies were not found. CONCLUSION PCP-Ⅰand PCP-Ⅱshow weak immunogenicity, which may be quite safe as a vaccine adjuvant.