Expression of the two insulin receptor isoforms is not altered in the skeletal muscle and liver of diabetic rats
| Autor: | M. D'Adamo, Andrea Giaccari, A. Buongiorno, S. Caiola, G. Tamburrano, L. Morviducci, E. Maroccia, Paolo Sbraccia, D. Zorretta |
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| Rok vydání: | 1998 |
| Předmět: |
Male
Gene isoform medicine.medical_specialty Endocrinology Diabetes and Metabolism medicine.medical_treatment Biology Settore MED/07 - MICROBIOLOGIA E MICROBIOLOGIA CLINICA Diabetes Mellitus Experimental Rats Sprague-Dawley Exon Endocrinology Internal medicine Diabetes mellitus Gene expression medicine Animals Humans RNA Messenger Muscle Skeletal Insulin Alternative splicing isoforms Skeletal muscle medicine.disease Receptor Insulin Rats Insulin receptor medicine.anatomical_structure Diabetes Mellitus Type 2 Liver biology.protein |
| Zdroj: | Metabolism. 47:129-132 |
| ISSN: | 0026-0495 |
| DOI: | 10.1016/s0026-0495(98)90207-4 |
| Popis: | Alternative splicing of the 36-base pair exon 11 of the human insulin receptor (IR) gene and of the corresponding domain of the rat IR gene results in the synthesis of two IR isoforms with distinct functional characteristics. Altered expression of these IR isoforms has been previously demonstrated in the skeletal muscle of patients with non-insulin-dependent diabetes mellitus (NIDDM); however, this observation was not confirmed by other studies and is still a matter of debate. To assess whether the reported altered isoform expression is due to the secondary metabolic derangement of diabetes, we examined alternative splicing of IR mRNAs (IR36+ and IR36-, corresponding to human Ex11+ and Ex11-) in the skeletal muscle and liver of 6-hour fasting 90% pancreatectomized insulin-resistant diabetic and control Sprague-Dawley rats, using the reverse transcriptase-polymerase chain reaction (PCR) technique. Both diabetic and control rats showed the same pattern of IR mRNA expression: the liver exclusively expressed IR36+ mRNA, whereas only IR36- mRNA was detected in muscle. In conclusion, diabetes mellitus per se does not alter the expression of IR isoforms in the liver and skeletal muscle, and therefore, at least in this animal model of NIDDM, impaired insulin action develops independently from a relative increase in IR36+ mRNA expression in skeletal muscle. |
| Databáze: | OpenAIRE |
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