Insulin receptor gene expression during development: developmental regulation of insulin receptor mRNA abundance in embryonic rat liver and yolk sac, developmental regulation of insulin receptor gene splicing, and comparison to abundance of insulin-like growth factor 1 receptor mRNA
Autor: | Lynn R. Carnaghi, Stephen J. Giddings |
---|---|
Rok vydání: | 1992 |
Předmět: |
medicine.medical_specialty
RNA Splicing medicine.medical_treatment Gene Expression Gestational Age Receptor IGF Type 1 Embryonic and Fetal Development Insulin-like growth factor Fetus Endocrinology Internal medicine medicine Animals RNA Messenger Yolk sac Receptor Molecular Biology Glucagon-like peptide 1 receptor Yolk Sac Insulin-like growth factor 1 receptor biology Insulin Cell Differentiation RNA Probes General Medicine Receptor Insulin IRS2 Rats Insulin receptor medicine.anatomical_structure Gene Expression Regulation Liver embryonic structures biology.protein |
Zdroj: | Molecular Endocrinology. 6:1665-1672 |
ISSN: | 1944-9917 0888-8809 |
Popis: | Insulin gene expression has been demonstrated in nonpancreatic tissues early in development, suggesting that this hormone might have actions significant for the differentiating embryo. Because such actions imply ligand-receptor binding, we quantified mRNAs encoding the two known forms of insulin receptor in rat liver and yolk sac, two endodermally derived tissues shown to express insulin genes, between gestation days (E) 13 and E21 (mid-organogenesis to parturition). Because of its presumed importance for fetal growth, we estimated the abundance of mRNA encoding insulin-like growth factor 1 (IGF 1) receptor in the same samples for comparison. The abundance of insulin receptor mRNA exceeded that for IGF 1 receptor mRNA in liver and yolk sac at all times studied. This difference was greater in liver, where insulin receptor mRNAs were three to more than 50 times more abundant than IGF 1 receptor mRNA on gestation days E13-E16, times which antedate the development of significant hepatic metabolic actions of insulin. The marked abundance of mRNAs encoding insulin receptors is consistent with the hypothesis that insulin has significant actions in specific tissues during the organogenic period. |
Databáze: | OpenAIRE |
Externí odkaz: |