Insulin-likegrowthfactorI(alsoknownassomatomedinCandsomatomedinA)andinsulin-likegrowthfactorII(multiplicationstimulatingactivityorMSA)belongtothefamilyofinsulin-likegrowthfactorsthatarestructurallyhomologoustoproinsulin.MatureIGF-IandIGF-IIshareapproximately70%sequenceidentity.BothIGF-IandIGF-IIareexpressedinmanytissuesandcelltypesandmayhaveautocrine,paracrineandendocrinefunctions.MatureIGF-IandIGF-IIarehighlyconserved(100%identitybetweenhuman,bovineandporcineproteins)andexhibitcross-speciesactivity.IGF-IIisapotentmitogenicgrowthfactor.
IGF-IIbindingissignificantlyincreasedinthediabetickidneyandcouldplayaroleindiabeticneuropathy.Italsoappearstobeinvolvedsignificantlyintheprogressionofmanytumors
Image:IGF-IIstainingofParaffin-embeddedtissuesectionsofhumanplacenta(chorionicvilli).Tissuewas HRP-AECCell (red)andcounterstainedwithHaematoxylin(blue).
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