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Anti-Tumor Immunotherapy Elicited by Cross-Link Peptide Vaccine Alpha-Fetoprotein and Heat Shock Protein 70 Complex

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Abstract:

Purposes: To construct a recombinant vaccine alpha-fetoprotein (AFP)-heat shock protein (HSP70) complex, and study its ability to induce specific CTL response and its protective effect against AFP-producing tumor. Material/Methods: A recombinant vaccine was constructed by conjugating mouse alpha-fetoprotein to heat shock protein 70. By way of intracutaneous injection, mice were primed and boosted with recombinant vaccine mAFP/HSP70, whereas single mAFP or HSP70 injection as controls. The ELISPOT and ELISA were used to measure the frequency of cells producing the cytokine IFN-gama in splenocytes and the level of anti-AFP antibody of serum from immunized mice respectively. In vivo tumor challenges were carried out to assess the immune effect of the recombinant vaccine. Results: By recombinant mAFP/HSP70 vaccine immunization, the results of ELISPOT and ELISA showed that the number of splenic cells producing IFN-gama and the level of anti-AFP antibody of serum were significantly higher in mAFP/HSP70 group than those in mAFP and HSP70 groups (108.50±11.70 IFN-gama spots/106 cells vs 41.60±10.40 IFN-gama spots/106 cells, 7.32±3.14 IFN-gama spots/106 cells, P<0.01; 156.32±10.42 µg/mL vs 66.52±7.35 µg/mL, 5.73±2.89 µg/mL, P<0.01). The tumor volume in mAFP/HSP70 group was significantly smaller than that in mAFP and HSP70 groups (42.44±7.14 mm3 vs 392.23±12.46 mm3, 838.63±13.84 mm3, P<0.01). Conclusions: The study further confirmed the function of heat shock protein 70’s immune adjuvant. Sequential immunization with recombinant mAFP/HSP70 vaccine could generate effective antitumor immunity on AFP-producing tumor. The recombined mAFP/HSP70 vaccine may be suitable for serving as an immunotherapy for hepatocellular carcinoma.

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Info:

Periodical:

Advanced Materials Research (Volumes 343-344)

Pages:

378-383

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.343-344.378

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Online since:

September 2011

Authors:

Huan Ping Lin, Xiao Ping Wang, Qiao Xia Wang

Keywords:

Heat Shockprotein 70 (HSP70), Immunity, Recombinant Vaccine, α-Fetoprotein (AFP)

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