Abstract: The present invention discloses a modified interleukin 12 (nsIL-12) and its gene, recombinant vector and use in manufacture of a medicament for treatment of tumors. When the oncolytic adenovirus vector carrying the modified interleukin 12 gene targets tumor tissue, the modified interleukin 12 is continuously expressed at a low level and mainly distributed in the local tumor tissue, which improves the specificity to tumor cells and reduces the systemic toxicity of interleukin 12; the modified interleukin 12 shows stronger inhibitory effect on tumor growth in intraperitoneally disseminated tumors and orthotopic tumors, and has low toxicity. The modified interleukin 12 armed oncolytic viruses show excellent anti-tumor effects, with a significant regression of tumors and lower toxicity compared with the existing IL-12 armed virus.

Abstract: The present invention discloses a modified interleukin 12 (nsIL-12) and its gene, recombinant vector and use in manufacture of a medicament for treatment of tumors. When the oncolytic adenovirus vector carrying the modified interleukin 12 gene targets tumor tissue, the modified interleukin 12 is continuously expressed at a low level and mainly distributed in the local tumor tissue, which improves the specificity to tumor cells and reduces the systemic toxicity of interleukin 12; the modified interleukin 12 shows stronger inhibitory effect on tumor growth in intraperitoneally disseminated tumors and orthotopic tumors, and has low toxicity. The modified interleukin 12 armed oncolytic viruses show excellent anti-tumor effects, with a significant regression of tumors and lower toxicity compared with the existing IL-12 armed virus.

Abstract: A subgroup B recombinant human adenovirus vector Ad11-5EP (SEQ ID NO: 1), which is constructed by a method including: substituting a 365 bp fragment containing an enhancer and a promoter of an upstream coding sequence of Ad5 E1A (SEQ ID NO: 2) for a corresponding region of a serotype Ad11 (SEQ ID NO: 3) of a subgroup B human adenovirus vector by homologous recombination to construct the subgroup B recombinant human adenovirus vector Ad11-5EP (SEQ ID NO: 1).

Abstract: The present invention discloses a modified interleukin 12 (nsIL-12) and its gene, recombinant vector and use in manufacture of a medicament for treatment of tumors. When the oncolytic adenovirus vector carrying the modified interleukin 12 gene targets tumor tissue, the modified interleukin 12 is continuously expressed at a low level and mainly distributed in the local tumor tissue, which improves the specificity to tumor cells and reduces the systemic toxicity of interleukin 12; the modified interleukin 12 shows stronger inhibitory effect on tumor growth in intraperitoneally disseminated tumors and orthotopic tumors, and has low toxicity. The modified interleukin 12 armed oncolytic viruses show excellent antitumor effects, with a significant regression of tumors and lower toxicity compared with the existing IL-12 armed virus.

Abstract: A method for reconstructing a replication-selective oncolytic adenovirus using a subgroup B recombinant human adenovirus vector Ad11-5EP. The method includes: 1) deleting E1A CR2 gene and/or anti-apoptotic gene E1B 21K that is necessary for viability of an adenovirus in normal cells but not necessary in tumor cells; 2) inserting a tumor-specific promoter to drive the expression of E1A gene; 3) re-directing a cellular tropism of Ad11-5EP according to receptors on a tumor cell surface; or 4) allowing adenovirus to selectively replicate in tumor cells.

Abstract: A method for constructing a subgroup B recombinant human adenovirus vector Ad11-5EP. The method includes substituting a 365 bp fragment including an enhancer and a promoter of an upstream coding sequence of Ad5 E1A for a corresponding region of a serotype Ad11 of the subgroup B human adenovirus vector by homologous recombination to construct the subgroup B recombinant human adenovirus vector Ad11-5EP. A subgroup B recombinant human adenovirus vector Ad11-5EP constructed by the method and the use thereof for treatment of tumors are also provided.

Abstract: A method for constructing a subgroup B recombinant human adenovirus vector Ad11-5EP. The method includes substituting a 365 bp fragment including an enhancer and a promoter of an upstream coding sequence of Ad5 E1A for a corresponding region of a serotype Ad11 of the subgroup B human adenovirus vector by homologous recombination to construct the subgroup B recombinant human adenovirus vector Ad11-5EP. A subgroup B recombinant human adenovirus vector Ad11-5EP constructed by the method and the use thereof for treatment of tumors are also provided.

Abstract: An oncolytic adenovirus vector and its potential application in cancer treatment and vaccination. The inventive vector (named Ad-TD-hIL12) is derived from the human adenovirus group C type 5, more particularly including deletion of three adenovirus genes E1A-CR2, E1B19K and E3gp-19K, and a fused cDNA sequence of p35 and p40 subunit of human IL12 placed under the control of the E3gp-19K promoter. The invention also includes a method to construct the triple gene-deleted vector (Ad-TD). The Ad-TD-hIL12 and Ad-TD-shIL12 (with a short p40 sequence of human IL 12) vectors can be used as targeted, genetically engineered agents for treatment of various solid tumors, via not only intratumoral injection, and also in intraperitoneal injection, without causing significant side effects, showing a superior antitumor efficacy and safety.