Sun YL, Xu C, Su CQ, Ma JX, Gao J, Man XH, Li ZS. Recombinant adenovirus-mediated Hsp70 gene expression inhibits tumor growth in a rat xenograft model of pancreatic cancer.
Shijie Huaren Xiaohua Zazhi 2012;
20:15-21. [DOI:
10.11569/wcjd.v20.i1.15]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To observe the effect of recombinant adenovirus Ad5-pCEA-Hsp70-mediated Hsp70 gene expression on tumor growth in a rat xenograft model of pancreatic cancer, and to analyze the underlying mechanism.
METHODS: A rat xenograft model of pancreatic cancer was established, and model animals were randomly divided into three groups, which were given Ad5-pCEA-Hsp70, Ad5-control and PBS treatment, respectively. Antitumor effect was evaluated by comparing tumor size at different time points among the three groups. ELISA was used to detect the peripheral blood levels of Hsp70 protein, INF-g, TNF-a and IL-6. HE staining was used to detect lymphocyte infiltration. Animal spleen mononuclear cells were isolated to determine the proportion of CD83+ cells by flow cytometry. Cell-killing ability of spleen lymphocytes was observed in vitro.
RESULTS: At 4, 6, and 8 weeks after treatment, tumor volume in the Ad5-CEA-Hsp70 group was significantly lower than that in the Ad5-control group and PBS group (724.4 mm3 ± 81.6 mm3vs 901.3 mm3 ± 103.9 mm3, 987.5 mm3 ± 126.0 mm3; 681.3 mm3 ± 64.9 mm3vs 1 270.6 mm3 ± 131.6 mm3, 1 398.5 mm3 ± 193.0 mm3; 648.0 mm3 ± 65.9 mm3vs 1 487.0 mm3 ± 243.0 mm3, 1 660.0 mm3 ± 167.0 mm3; all P < 0.01). The levels of Hsp70 protein and cytokines INF-g, TNF-a and IL-6 in peripheral blood in the Ad5-pCEA-Hsp70 group were significantly higher than those in the Ad5-control group and PBS group (all P < 0.01). Compared to the Ad5-control group and PBS group, Ad5-pCEA-Hsp70 group had more lymphocytic infiltration. The proportion of CD83+ cells in the Ad5-pCEA-Hsp70 group was significantly higher than that in the Ad5-control group and PBS group (10.8% ± 1.3% vs 5.1% ± 0.6%, 4.8% ± 0.6%; both P < 0.01). In the lymphocyte-mediated CTL experiment, when the cell ratio of effect: target was 1:1, there was no significant difference in the cell killing ability among the three groups (P > 0.05), but with the increase in the effect: target cell ratio, the cell killing ability in the Ad5-pCEA-Hsp70 group was significantly increased (P < 0.05, P < 0.01).
CONCLUSION: Hsp70 gene expression mediated by recombinant adenovirus Ad5-pCEA-Hsp70 could inhibit tumor growth in a rat xenograft model of pancreatic cancer via mechanisms that are related to the promotion of dentritic cell maturation, induction of cytokine secretion, and promotion of lymphocyte infiltration.
Collapse