Nutritional modulation of canine insulin-like growth factors and their binding proteins
| Autor: | A. M. Cotterill, Richard F. Butterwick, M Yateman, Roger M. Batt, Cecilia Camacho-Hübner, Amanda Maxwell |
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| Rok vydání: | 1998 |
| Předmět: |
Male
medicine.medical_specialty Time Factors Endocrinology Diabetes and Metabolism medicine.medical_treatment Blotting Western Heterologous Insulin-like growth factor-binding protein Insulin-like growth factor Dogs Endocrinology Insulin-Like Growth Factor II Somatomedins Internal medicine medicine Animals Insulin Insulin-Like Growth Factor I biology Fissipedia Fasting Ligand (biochemistry) biology.organism_classification Somatomedin Breed Insulin-Like Growth Factor Binding Protein 1 Insulin-Like Growth Factor Binding Proteins Insulin-Like Growth Factor Binding Protein 2 Insulin-Like Growth Factor Binding Protein 3 biology.protein Autoradiography Biomarkers |
| Zdroj: | Journal of Endocrinology. 158:77-85 |
| ISSN: | 1479-6805 0022-0795 |
| DOI: | 10.1677/joe.0.1580077 |
| Popis: | The response of canine insulin-like growth factors (IGFs) and IGF-binding proteins (IGFBPs) to moderate nutritional restriction followed by refeeding has not previously been studied in detail. The purpose of these studies was to examine the effects of nutritional restriction on the IGF system of adult dogs. Normal serum IGF values were established after validation of heterologous RIAs for measuring canine IGFs-I and -II. Canine serum IGFBP profiles were examined by Western ligand blotting (WLB), using radiolabelled recombinant human (rh) IGF-I as the ligand, and were found to be similar to those of other species. IGF-I and IGFBP-3 concentrations correlated with body weight, thus reflecting breed size as previously shown, whereas IGF-II concentrations did not. IGFBP-2 serum concentrations and band intensity on WLB were increased compared with normal human serum IGFBP-2. Overnight fasting had no effect on IGF or IGFBP concentrations, including IGFBP-1, nor did refeeding. Prolonged restriction to 56% and then 42.5% of maintenance energy requirements for 2 weeks decreased IGF-I concentrations by 20.4% and 32.7% respectively. Feeding of the same diet ad libitum for 2 weeks normalised IGF-I concentrations. There were no changes in IGF-II or insulin levels. Serum IGFBP-2 concentrations increased with 56% restriction of maintenance energy (P = 0.03). We conclude that serum IGF-I is potentially a useful marker of short-term change in nutritional status in the adult dog. |
| Databáze: | OpenAIRE |
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