Differential Responses of Liver and Hypothalamus to the Nutritional Condition During Lactation and Adult Life
| Autor: | Silvia C. S. F. Azevedo, Renan Soares Rabassi, Camila Bataglini, Isabela Ramos Mariano, Vanessa Lara Rissi Sabino, Maria Montserrat Diaz Pedrosa, Laís Akemi Yamada, Rosângela Fernandes Garcia |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Litter (animal) medicine.medical_specialty Physiology Neuropeptide 030209 endocrinology & metabolism Biology Carbohydrate metabolism lcsh:Physiology 03 medical and health sciences 0302 clinical medicine Physiology (medical) Lactation Internal medicine Orexigenic medicine hypothalamus liver metabolism Original Research refeeding lcsh:QP1-981 Neuropeptide Y receptor 030104 developmental biology Endocrinology medicine.anatomical_structure Basal (medicine) Hypothalamus caloric restriction litter size medicine.drug |
| Zdroj: | Frontiers in Physiology Frontiers in Physiology, Vol 11 (2020) |
| ISSN: | 1664-042X |
| DOI: | 10.3389/fphys.2020.00553 |
| Popis: | It was previously reported that liver glucose metabolism in rats under caloric restriction differs from that of freely-fed rats. This study hypothesized that these changes (1) were related to the expression of hypothalamic neuropeptides involved in metabolic control, and (2) were not a residual effect of litter size. To those purposes, liver glucose metabolism and hypothalamic expression of the orexigenic neuropeptides NPY (neuropeptide Y) and AgRP (agouti gene-related peptide); and of the anorexigenic neuropeptides POMC (pro-opiomelanocortin) and CART (cocaine- and amphetamine-related transcripts) were investigated. Male Wistar rats from two different litter sizes (G6 and G12, with 6 or 12 pups, respectively) were subjected to free feeding (GL, ad libitum), 50% caloric restriction (GR) or caloric restriction+ad libitum refeeding (GRL) until the age of 90 days. Biometric values were lower in GR than in GL, while in GRL they were totally or partially recovered. Blood glucose variation during the pyruvate tolerance test (PTT) was small in GR. During in situ liver perfusion, total, basal, and adrenaline-stimulated liver glucose outputs were high in GR, but additional glucose output in the presence of alanine was negligible. Refeeding (GRL) yielded values close to those of GL. Litter size did not consistently influence any of these variables. The expression of transcripts of the hypothalamic neuropeptides was responsive to feeding regimen, litter size and/or their interaction and differed from G6 to G12, while the metabolic changes of the liver were qualitatively equal in both GR. Therefore, the changes in glucose metabolism in the liver of rats under caloric restriction were not determined by either litter size or hypothalamic neuropeptide expression and were linked only to the prevailing feeding regimen of the adult animal. |
| Databáze: | OpenAIRE |
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