Platycodin D2 Improves Specific Cellular and Humoral Responses to Hepatitis B Surface Antigen in Mice |
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Authors: | Yong Xie Shu‐Wang He Hong‐Xiang Sun Duo Li |
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Institution: | 1. Key Laboratory of Animal Epidemic Etiology & Immunological Prevention of the Ministry of Agriculture, College of Animal Sciences, Zhejiang University, Hangzhou 310029, P.?R. China, (phone: +86‐571‐86971091;2. fax: +86‐571‐86971091);3. School of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, P.?R. China;4. Department of Pharmacy, Fujian University of Traditional Chinese Medicine, Fuzhou 350108, P.?R. China |
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Abstract: | Platycodin D2 ( 1 ), a less hemolytic saponin from the root of Platycodon grandiflorum than platycodin D ( 2 ), was evaluated for the potential to enhance specific cellular and humoral immune responses to hepatitis B surface antigen (HBsAg) in mice. It significantly increased the concanavalin A (Con A)‐, lipopolysaccharide (LPS)‐, and HBsAg‐induced splenocyte proliferation in HBsAg‐immunized mice (P<0.05, P<0.01, and P<0.001, resp.). HBsAg‐specific IgG, IgG1, IgG2a, and IgG2b antibody titers in the serum were also markedly enhanced by 1 compared to the HBsAg control group (P<0.01 or P<0.001). Moreover, 1 significantly promoted the production of Th1 (IL‐2 and IFN‐γ) and Th2 (IL‐4 and IL‐10) cytokines from splenocytes in the HBsAg‐immunized mice (P<0.001). The adjuvant potential of 1 on splenocyte proliferation, serum HBsAg‐specific IgG2a and IgG2b antibody response, as well as Th1‐cytokine secretion from splenocytes in the HBsAg‐immunized mice was higher than that of Alum. The results suggest that 1 could improve both cellular and humoral immune responses to HBsAg in mice. Hence, 1 might be a promising adjuvant for hepatitis B vaccine with dual Th1‐ and Th2‐potentiating activity. |
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Keywords: | Platycodin D2 Hepatitis B surface antigen (HBsAg) Vaccine adjuvant Cellular immune response Humoral immune response |
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