
Originally Posted by
oswaldosalcedo
again.....
the liver does not produce igf 2
nor is transformed from igf 1.
IGF-1 is secreted by the liver
IGF-2 is secreted by the brain, kidney, pancreas and muscle.
The IGF-2 receptor only binds IGF-2 and acts as a "clearance receptor" - it activates no intracellular signalling pathways, functioning only as an IGF-2 sequestering agent and preventing IGF-2 signalling.
see:
"Insulin-like growth factor (IGF)-2 is overexpressed in hepatocellular carcinoma and accompanying dysplastic lesions. IGF-2 signalling is mediated through IGF-1 receptor (IGF-1R), while mannose 6-phosphate/insulin-like growth factor-2 receptor (M6P/IGF-2R) controls pericellular levels of free IGF-2"
British Journal of Cancer (2003) 88, 733-739.
doi:10.1038/sj.bjc.6600777
focal overexpression of insulin-like growth factor 2.
N Sedlaczek1,2, A Hasilik3, P Neuhaus4, D Schuppan5 and H Herbst1
1.-Institute of Pathology, University of Muenster, Muenster, D-48129, Germany
2.-Department of Gastroenterology and Hepatology, Klinikum Benjamin Franklin, Free University of Berlin, Berlin, Germany
3.-Institute of Physiological Chemistry, Philipps-University, Marburg, Germany
4.-Department of Surgery, Charitè, Campus Virchow-Klinikum, Humboldt-University, Berlin, Germany
5.-Department of Gastroenterology and Hepatology, Friedrich-Alexander-University, Erlangen, Germany
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see:
Cohen, Pinchas, et al. "Insulin-like growth factors (IGFs), IGF receptors, and IGF-binding proteins in primary cultures of prostate epithelial". Journal of Clinical Endocrinology and Metabolism, Vol. 73, No. 2, 1991, pp. 401-07