[Expression of human PD-1Deltaex3 and primary study of its biological activity].
Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi
; 26(3): 207-10, 2010 Mar.
Article
em Zh
| MEDLINE
| ID: mdl-20230680
ABSTRACT
AIM:
To express human PD-1Deltaex3(DeltaPD-1) gene in eukaryotic expressing vector and identify the biological activity of the recombinant protein.METHODS:
The target gene encoding full length human PD-1(PD-1) was cloned by RT-PCR, then two fragments of PD-1Deltaex3 gene were amplified and assembled by TP-PCR, PD-1Deltaex3 gene was obtained. Then the two genes PD-1 and DeltaPD-1 were inserted into the eukaryotic expressing vector pIRES2-EGFP respectively to construct the recombinant vectors pIRES2-EGFP/PD-1 and pIRES2-EGFP/DeltaPD-1. The recombinants were transfected into 293T cells with Lipofect2000 Reagent. The membrane PD-1 protein on the transfected cell surface was detected by flow cytometry. The expression of soluble PD-1 was also analysised by Western blot. The combination of DeltaPD-1 protein to the ligands of PD-1, PD-L1 and PD-L2, were determined by indirect immunofluorescence assay.RESULTS:
The results of enzyme digestion of recombinant vectors and DNA sequencing showed the two genes PD-1 and PD-1Deltaex3 were inserted correctly into plasmid pIRES2-EGFP, the two recombinant vectors were constructed successfully. Flow cytometry and Western blot revealed that 293T cells transfected with vector pIRES2-EGFP/PD-1 could express PD-1 protein on the cell surface but no soluble PD-1 in the supernatant of transfected cells, on the contrary, 293T cells transfected with vector pIRES2-EGFP/DeltaPD-1 could express soluble PD-1 in the culture supernatant but no membrane PD-1. Indirect immunofluorescence assay indicated the DeltaPD-1 protein could bind to the two ligands of PD-1 on the cells surface.CONCLUSION:
The recombinant eukaryotic expressing vector containing PD-1Deltaex3 was constructed successfully, and the PD-1Deltaex3 gene could encode a soluble form of PD-1 protein. DeltaPD-1 protein remained the biological activity as PD-1. This study provides the initial material for further study of PD-1Deltaex3 in PD-1/PD-L signaling pathway.
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Antígenos CD
/
Expressão Gênica
/
Proteínas Reguladoras de Apoptose
Tipo de estudo:
Prognostic_studies
Limite:
Humans
Idioma:
Zh
Ano de publicação:
2010
Tipo de documento:
Article