论文部分内容阅读
AIM: To construct a yeast expression system of human augmenter of liver regeneration (hALR) and to examine its bioactivity in vitro.METHODS: With PCR and gene recombination techniques,cDNA of open reading frame of hALR was obtained from recombinant plasmid pcDNA3.1-hALR and inserted into plasmid pPIC9. The cDNA of hALR from recombinant plasmid pPIC9-hALR demonstrated by sequencing was subcloned into plasmid pPIC9K. The recombinant plasmid pPIC9KhALR was transformed into GS115 with electroporation.hALR was expressed by GS1L5 under the induction of 5 mL/L methanol and purified with ultrafiltration after it was analyzed by 15% SDS-PAGE and West blot. The effects of hALR on in vitro proliferation of QGY and HepG2 cells were evaluated by 3H-TdR methods.RESULTS: The correctness and integrity of recombinant plasmids ppIC9-hALR and pPIC9K-hALR were identified by restriction digestion, PCR and sequencing methods,respectively. hALR as a secretive protein was successfully expressed by GS115. Its molecular weight was about 15 ku and the target protein was about 60% of the total protein in the supatant from GS115 with plasmid ppIC9K-hALR.The results of West blot of hALR showed the specific band. The high qualitative hALR was obtained through ultrafiltration. hALR could stimulate in vitro proliferation of QGY and HepG2 cells in a dose-dependent manner, but there was a difference in reactivity to hALR between QGY and HepG2.CONCLUSION: The hALR as a secretive protein can be successfully expressed by GS115. It may stimulate in vitro proliferation of QGY and HepG2 cells at a dose-dependent manner. But QGY and HepG2 cells have different reactivities to hALR.