Abstract：
:The plant polysaccharides are recognized as an effective biological response modifier with low toxicity. In this study, the water-soluble polysaccharide from the roots of Actinidia eriantha (AEPS) was evaluated for its toxicity and adjuvant potential on the specific cellular and humoral immune responses to ovalbumin (OVA) in mice. AEP did not cause any mortality and side effects when mice were administered subcutaneously twice at the dose up to 5.0mg at intervals of 7 days. The mice were immunized subcutaneously with OVA 100 microg alone or with OVA 100 microg dissolved in saline containing Quil A (10 microg) or AEPS (25, 50, or 100 microg) on days 1 and 15. Two weeks later, splenocyte proliferation, natural killer (NK) cell activity, production and mRNA expression of cytokines from splenocytes, and serum OVA-specific antibody titers were measured. The Con A-, LPS-, and OVA-induced splenocyte proliferation and the serum OVA-specific IgG, IgG1, IgG2a, and IgG2b antibody titers in the immunized mice were significantly enhanced by AEPS (P<0.05, P<0.01 or P<0.001). AEPS also significantly promoted the production of Th1 (IL-2 and IFN-gamma) and Th2 (IL-10) cytokines and up-regulated the mRNA expression of IL-2, IFN-gamma, IL-4 and IL-10 cytokines and T-bet and GATA-3 transcription factors in splenocytes from the immunized mice (P<0.05, P<0.01 or P<0.001). Besides, AEPS remarkably increased the killing activities of NK cells from splenocytes in the immunized mice (P<0.01 or P<0.001). The results indicated that AEPS had strong potential to increase both cellular and humoral immune responses and elicit a balanced Th1/Th2 response, and that AEPS may be a safe and efficacious adjuvant candidate suitable for a wide spectrum of prophylactic and therapeutic vaccines.
journal_name
Vaccinejournal_title
Vaccineauthors
Sun HX,Wang H,Xu HS,Ni Ydoi
10.1016/j.vaccine.2009.04.037subject
Has Abstractpub_date
2009-06-19 00:00:00pages
3984-91issue
30eissn
0264-410Xissn
1873-2518pii
S0264-410X(09)00582-9journal_volume
27pub_type
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