Abstract
Expression of insulin-like growth factor I (IGF-I) and insulin-like growth factor II (IGF-II) genes in the human brain and in glioma was studied by slot blot and Northern analysis following hybridization of IGF-I and IGF-II cDNA probes to isolated mRNA. In the fetal brain there were major IGF-I transcripts of 7.5 and 4.4 kilobases (kb) and one major IGF-II transcript of 6.0 kb. IGF-II mRNA was less abundant in the adult brain, with IFG-II mRNA being scarcely detectable. All glioma tissue examined displayed a marked enhancement of both IGF-I and IGF-II gene expression when compared to normal brain. IGF-I transcripts of 4.4 and 2.2–1.8 kb were identified. Similar to fetal brain a major IGF-II transcript of 6.0 kb was found in the glioblastoma examined.
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