Abstract
Growth hormone (GH) is an anabolic mitogen with widespread influence on cellular growth and differentiation as well as on glucose and lipid metabolism. GH binding to the growth hormone receptor (GHR) on hepatocytes prompts expression of insulin growth factor I (IGF-1) involved in nutritionally induced compensatory hyperplasia of pancreatic β-cell islets and insulin release. A prolonged hyperactivity of the IGF-1/insulin axis in the face of insulinotropic nutrition, on the other hand, can lead to collapse of the pancreatic islets and glucose intolerance. Individuals with Laron syndrome carry mutations in the GHR gene resulting in severe congenital IGF-1 deficiency and elevated GH serum levels leading to short stature as well as perturbed lipid and glucose metabolism. However, these individuals enjoy a reduced prevalence of acne, cancer and possibly diabetes. Minipigs have become important biomedical models for human conditions due to similarities in organ anatomy, physiology, and metabolism relative to humans. The purpose of this study was to generate transgenic Wuzhishan minipigs by handmade cloning with impaired systemic GHR activity and assess their growth profile and glucose metabolism. Transgenic minipigs featuring overexpression of a dominant-negative porcine GHR (GHRdm) presented postnatal growth retardation and proportionate dwarfism. Molecular changes included elevated GH serum levels and mild hyperglycemia. We believe that this model may prove valuable in the study of GH functions in relation to cancer, diabetes and longevity.
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Acknowledgment
We are grateful to all participants of the transgenic group at BGI and the cloning group at BGI Ark Biotechnology (BAB). This work was supported by research grants from China and the National Basic Research Program of China (973 Program 2011CB944201), National Transgenic Project of China (2014ZX0801007B), Special Foundation of Shenzhen Municipal Government of China for the development of Bio-industry (ZYC201105170390A), Shenzhen overseas high level talents innovation Program (KQC201109050086A), Shenzhen Municipal Basic Research Program (JCYJ20120830105157538).
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Feida Li, Yong Li and Huan Liu have contributed equally to this work .
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Supplementary Table 1
List of primers. The color-code refers to PCR (black) and RT-qPCR (red) primers. The underlined sequences mark the recognition sites for the restriction enzyme NheI and XhoI, respectively (PPTX 44 kb)
Supplementary Table 2
Summary of cloning efficiencies obtained with the GHRdm transgenic Wuzhishan fetal donor fibroblasts (PPTX 42 kb)
Supplementary Table 3
Skeleton size of a GHRdm transgenic versus a non-transgenic Wuzhishan minipig (PPTX 40 kb)
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Li, F., Li, Y., Liu, H. et al. Transgenic Wuzhishan minipigs designed to express a dominant-negative porcine growth hormone receptor display small stature and a perturbed insulin/IGF-1 pathway. Transgenic Res 24, 1029–1042 (2015). https://doi.org/10.1007/s11248-015-9912-6
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DOI: https://doi.org/10.1007/s11248-015-9912-6