Immunization with dendritic cells infected with mTERT adenovirus vector effectively elicits immunity against mouse H22 hepatoma in vivo / 中华肿瘤杂志

ABSTRACT

<p><b>OBJECTIVE</b>To investigate the effects of dendritic cells (DCs) infected with adenovirus vector encoding mTERT on induction of mTERT antigen specific immunity against H22 hepatoma in vivo.</p><p><b>METHODS</b>Forty Bal B/c mice were subcutaneously immunized with Ad-mTERT infected DC. Cytotoxicity of mTERT specific CTL was determined by 51Cr release assay. IL-2 and IFN-gamma were tested by ELISA. IFN-gamma ELISPOT assays were performed for measuring antigen specific IFN-gamma production by T cells. Tumor size and survival of the immunized mice were recorded and evaluated whether preexisting hepatoma metastases could be supressed after immunization with mTERT-expressing DCs.</p><p><b>RESULTS</b>The lytic activity of CTL, IL-2 (871.25 pg/ml), IFN-gamma (169.15 ng/ml) and IFN-gamma secreting cells (378/10(6) spleen cells) elicited by the Ad-mTERT infected DCs were much stronger and higher than that by Ad-GFP group (131.6 pg/ml, 15.4 ng/ml, 36/10(6) spleen cells, P<0.05), DC group (71.3 pg/ml, 10.5 ng/ml, 21/10(6) spleen cells, P<0.05), PBS group (65.8 pg/ml, 7.4 ng/ml, 18/10(6) spleen cells, P<0.05). In prophylaxis and treatment experiment the Ad-mTERT/DCs immunized mice lived significantly longer than other groups, demonstrating that primary DCs were genetically modified to express the mTERT antigen and could suppress the tumor growth.</p><p><b>CONCLUSION</b>Adenovirus vector mediated mTERT infected DCs can effectively induce mTERT antigen specific antitumor activity, and can induce protective and therapeutic antitumor immunity.</p>