Induction of anti-tumour immunity by dendritic cells transduced with hTERT recombinant adenovirus in mice.

Dendritic cells (DCs) transfected with recombinant, replication-defective adenovirus (Ad) vectors encoding the human telomerase reverse transcriptase (hTERT) are potent inducers of cytotoxic T lymphocytes (CTLs) and anti-tumour immunity. However, previous studies have mostly been in vitro. In this study, we sought to determine whether DCs transfected with hTERT (DC/Ad-hTERT) could elicit a potent anti-tumour immunogenic response in vivo.

Dendritic cells reconstituted with a human heparanase gene induce potent cytotoxic T-cell responses against gastric tumor cells in vitro.

Background And Aims: Dendritic cell-based tumor vaccination is a promising approach in the treatment of cancer. Strategies to modify dendritic cells (DCs) with tumor-associated antigens (TAAs) can elicit specific immune responses against tumors. Heparanase is overexpressed in gastric cancer, especially in invasive and metastatic cells, but is downregulated in differential normal tissue.

[Immune response of heparinase gene modified dendritic cell-based vaccine on gastric cancer cells].

Objective: To explore the feasibility of heparinase vaccine in active immunity for gastric cancer.

Methods: Dendritic cells originated from the peripheral blood mononuclear cells (PBMC) of healthy HLA-A2 positive donors were transfected with recombinant adenovirus containing heparinase full length cDNA of heparanase to generate heparanase gene modified DC vaccine. T lymphocytes from the same donors were activated by those genetically modified DC vaccine repeatedly to generate heparanase specific cytotoxicity T lymphocytes (CTL).

In vitro anti-tumor immune response induced by dendritic cells transfected with hTERT recombinant adenovirus.

Transduction with recombinant, replication-defective adenoviral (Ad) vectors encoding a transgene is an efficient method for gene transfer into human dendritic cells (DC). Several studies have demonstrated that epitopes of the human telomerase reverse transcriptase gene (hTERT) can produce CTLs specific for malignant tumors. In this study, we constructed an hTERT recombinant adenovirus (rAd-hTERT) using DNA recombination.

[Increased expression of heparanase mRNA is correlated with metastasis of gastric carcinoma and is probably correlated with c-met protein].

Objective: To explore the expression of human heparanase mRNA and its relationship with the clinicopathological characteristics and angiogenesis and its possible mechanism in gastric carcinomas.

Methods: Expression of heparanase mRNA in gastric cancerous tissues and its corresponding adjacent tissues were detected by RT-PCR in forty-seven patients. Expression of c-met protein and microvessel density (MVD) were examined by immunohistochemcal staining.