Glucose lowering effect of transgenic human insulin-like growth factor-I from rice: in vitro and in vivo studies

BMC Biotechnology

Stanley CK Cheung²  Li-zhong Liu²  Lin-lin Lan²  Qiao-quan Liu¹  Samuel SM Sun²  Juliana CN Chan²  Peter CY Tong² 

[1] Key Laboratory of Plant Functional Genomics of the Ministry of Education, Agricultural College, Yangzhou University, Jiangsu 225009, PR China

[2] Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong

关键词: IGF-I;    KDEL;    protein targeting;    recombinant protein;    transgenic plant;    Oryza sativa L., plant bioreactor;   

Others  :  1146665
DOI  :  10.1186/1472-6750-11-37

 received in 2010-07-07, accepted in 2011-04-12,  发布年份 2011

【 摘 要 】

Background

Human insulin-like growth factor-I (hIGF-I) is a growth factor which is highly resemble to insulin. It is essential for cell proliferation and has been proposed for treatment of various endocrine-associated diseases including growth hormone insensitivity syndrome and diabetes mellitus. In the present study, an efficient plant expression system was developed to produce biologically active recombinant hIGF-I (rhIGF-I) in transgenic rice grains.

Results

The plant-codon-optimized hIGF-I was introduced into rice via Agrobacterium-mediated transformation. To enhance the stability and yield of rhIGF-I, the endoplasmic reticulum-retention signal and glutelin signal peptide were used to deliver rhIGF-I to endoplasmic reticulum for stable accumulation. We found that only glutelin signal peptide could lead to successful expression of hIGF-Iand one gram of hIGF-Irice grain possessed the maximum activity level equivalent to 3.2 micro molar of commercial rhIGF-I. In vitro functional analysis showed that the rice-derived rhIGF-I was effective in inducing membrane ruffling and glucose uptake on rat skeletal muscle cells. Oral meal test with rice-containing rhIGF-I acutely reduced blood glucose levels in streptozotocin-induced and Zucker diabetic rats, whereas it had no effect in normal rats.

Conclusion

Our findings provided an alternative expression system to produce large quantities of biologically active rhIGF-I. The provision of large quantity of recombinant proteins will promote further research on the therapeutic potential of rhIGF-I.

【 授权许可】

   
2011 Cheung et al; licensee BioMed Central Ltd.

【 图 表 】

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