Abstract
Human growth hormone (hGH) is the major and important hormone component of human being. At present, hGH for clinical uses is mostly produced in Escherichia coli, which requires costly denaturation and refolding to recover functionality. To obtain long-term bioactive hormone, we used hGH as a foreign gene and constructed a recombinant plasmid pJS700-hGH which carries a recombinant gene cotC-hgh with an enterokinase site under the control of cotC promoter. Plasmid pJS700-hGH was transformed into Bacillus subtilis by double crossover and an amylase-inactivated mutant was produced. After spore formation, Western blot and fluorescence immunoassay were used to monitor hGH surface expression on spores. Oral administration to silkworm with spores displaying hGH further showed that the recombinant spores may have potential ability to be digested and absorbed into the silkworm’s hemolymph due to both the resistant characters of spores and the addition of enterokinase site.
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Acknowledgments
We honestly thank Professor Degang Ning for kindly gifting plasmid pJS700, and Professor Hengchuan Xia for language revision of the text. This study was supported by the National Basic Research Program of China “973” under Grant No. 2012CB114604, the Natural Science Research General Project of Education Office of Anhui Province (No. KJ2012B108), and Postgraduate Research and Innovation Project of Jiangsu Province (Nos. CXZZ12_0703 and CXZZ13_0699). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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Lian, C., Zhou, Y., Feng, F. et al. Surface Display of Human Growth Hormone on Bacillus subtilis Spores for Oral Administration. Curr Microbiol 68, 463–471 (2014). https://doi.org/10.1007/s00284-013-0500-9
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DOI: https://doi.org/10.1007/s00284-013-0500-9