ABSTRACT
Objective: To construct attenuated salmonella typhimurium haboring an eukaryotic co-expression plasmid encoding TIP30 and human IFN-? gene and observing its effect on the growth of adenoid cystic carcinoma. Methods: The TIP30 and human IFN-? genes were amplified by PCR and inserted into eukaryotic expression vector pCI-neofor the construction of expression plasmids pCI-TIP30 and pCI-IFN, respectively. A co-expression plasmid pCI-TIP30/IFN was constructed by linking TIP30 and human IFN-? gene using the sequence of internal ribosome binding sequence (IRES). Three recombinant expression plasmids were transformed into an attenuated AroA'autotrophic mutant of salmonella typhimurium SL7207, the resultant bacteria were used to infected murine macrophage in vitro and the expressed products were detected by Western blot and ELISA, respectively. Tumor growth was observed by oral administration of the recombinant salmonella typhimuriums to the nude mouse with adenoid cystic carcinoma. Results: Murine macrophage infected with recombinant salmonella transformed with both plasmids pCI-TIP30 and pCI-TIP30/IFN could express TIP30 protein, and murine macrophage infected with recombinant salmonella transformed with pCI-IFN or pCI-TIP30/IFN could secret human IFN-? in the culture supernatant. Attenuated salmonella typhimurium and three constructed recombinant salmonella typhimuriums all had evident inhibition onthe tumor growth in nude mouse with adenoid cystic carcinoma. Conclusion: The recombinant attenuated salmonella typhimuriums haboring plasmid pCI-TIP30, plasmidpCI-IFN and co-expressing plasmidp-CI-TIP30/IFN were successfully constructed, which could inhibit the growth of adenoid cystic carcinoma in nude mouse.