Construction of the attenuated Salmonella typhimurium strain expressing Helicobacter pylori conservative region of adhesin antigen / 生物工程学报
Chinese Journal of Biotechnology
;
(12): 433-438, 2003.
Artigo
em Chinês
| WPRIM
| ID: wpr-259172
ABSTRACT
To construct a non-resistance and attenuated Salmonella typhimurium strain which expresses conservative region of adhesin(AB) of Helicobacter pylori(Hp). The AB gene was amplified by PCR and inserted into the expression vector pYA248 containing asd gene and was introduceded into the delta Cya, delta Crp, delta Asd attenuated Salmonella typhimurium strain by twice transformations, which is a balanced lethal recombinant. Bridged ELISA method was used to measure AB expressed in sonicate and culture supernatant. According to Meacock's way and growth curve, stability of the recombinant is evaluated. Semi-lethal capacity test was used to evaluate the safty of recombinant. Results showed S. typhimurium X4072(pYA248-AB) was constructed successfully, recombinant X4072(pYA248- AB) content of supernatant serum was higher than that of thallus lytic liquor confirmed by bridged ELISA, and after recombinant pYA248- AB cultured 100 generation without selection pressure, all the recombinant germ selected randomly can grow, and the AB antigen was positive by ELISA detection. The growth curve of the recombinant germ showed that the growth state of X4072(pYA248) and X4072(pYA248- AB) were coincidence on the whole, and the survival rate of C57BL/6 was still 100%, 30 days after taking X4072(pYA248- AB) 1.0 x 10(10)cfu. orally. Non-resistance S. typhimurium X4072(pYA248- AB) was constructed successfully. The recombinant plasmid was stable indicated by in vitro experiment. And the recombinant strain was safe confirmed by animal experiment. This live vaccine strain is worthy to be considered as a new live oral vaccine candidate against Hp infection.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Plasmídeos
/
Salmonella typhimurium
/
Ensaio de Imunoadsorção Enzimática
/
Reação em Cadeia da Polimerase
/
Helicobacter pylori
/
Adesinas Bacterianas
/
Vetores Genéticos
/
Genética
/
Metabolismo
/
Camundongos Endogâmicos C57BL
Limite:
Animais
Idioma:
Chinês
Revista:
Chinese Journal of Biotechnology
Ano de publicação:
2003
Tipo de documento:
Artigo
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