[Expression of human PD-1Deltaex3 and primary study of its biological activity].
OBJECTIVE
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.


CONCLUSIONS
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.
Medical Biotechnology Institute of Soochow University, Suzhou, China.
Zhen-hua
ZH
Hu
Yong-jing
YJ
Chen
Qin
Q
Wang
Bi-min
BM
Shi
Li-xiong
LX
Bai
Xue-guang
XG
Zhang
D015703:Antigens, CD / Q000235:genetics* / Q000378:metabolism; D051017:Apoptosis Regulatory Proteins / Q000235:genetics* / Q000378:metabolism; D002460:Cell Line; D003001:Cloning, Molecular; D015870:Gene Expression; D005822:Genetic Vectors / Q000235:genetics / Q000378:metabolism; D006801:Humans; D061026:Programmed Cell Death 1 Receptor; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism
D015703:Antigens, CD; D051017:Apoptosis Regulatory Proteins; C105992:PDCD1 protein, human; D061026:Programmed Cell Death 1 Receptor; D011994:Recombinant Proteins