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| Mendonça,A.C.; Carneiro,E.M.; Bosqueiro,J.R.; Crepaldi-Alves,S.C.; Boschero,A.C.. |
| We studied the development of the insulin secretion mechanism in the pancreas of fetal (19- and 21-day-old), neonatal (3-day-old), and adult (90-day-old) rats in response to stimulation with 8.3 or 16.7 mM glucose, 30 mM K+, 5 mM theophylline (Theo) and 200 µM carbamylcholine (Cch). No effect of glucose or high K+ was observed on the pancreas from 19-day-old fetuses, whereas Theo and Cch significantly increased insulin secretion at this age (82 and 127% above basal levels, respectively). High K+ also failed to alter the insulin secretion in the pancreas from 21-day-old fetuses, whereas 8.3 mM and 16.7 mM glucose significantly stimulated insulin release by 41 and 54% above basal levels, respectively. Similar results were obtained with Theo and Cch. A more... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rat islet cell; Glucose; Pancreatic islets; Carbamylcholine; Theophylline; Potassium; Insulin secretion. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000600018 |
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| Rafacho,A.; Giozzet,V.A.G.; Boschero,A.C.; Abrantes,J.L.F.; Cestari,T.M.; Carneiro,E.M.; Bosqueiro,J.R.. |
| A low-protein diet leads to functional and structural pancreatic islet alterations, including islet hypotrophy. Insulin-signaling pathways are involved in several adaptive responses by pancreatic islets. We determined the levels of some insulin-signaling proteins related to pancreatic islet function and growth in malnourished rats. Adult male Wistar rats (N = 20 per group) were fed a 17% protein (normal-protein diet; NP) or 6% protein (low-protein diet; LP), for 8 weeks. At the end of this period, blood glucose and serum insulin and albumin levels were measured. The morphometric parameters of the endocrine pancreas and the content of some proteins in islet lysates were determined. The β-cell mass was significantly reduced (≅65%) in normoglycemic but... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Β-cell mass; Insulin signaling; Low-protein diet; Pancreatic islets; Protein phosphorylation. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009001000010 |
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| Macêdo,G.S.; Ferreira,C.L.P.; Menegaz,A.; Arantes,V.C.; Veloso,R.V.; Carneiro,E.M.; Boschero,A.C.; Oller do Nascimento,C.M.P.; Latorraca,M.Q.; Gomes-da-Silva,M.H.G.. |
| During pregnancy and protein restriction, changes in serum insulin and leptin levels, food intake and several metabolic parameters normally result in enhanced adiposity. We evaluated serum leptin and insulin levels and their correlations with some predictive obesity variables in Wistar rats (90 days), up to the 14th day of pregnancy: control non-pregnant (N = 5) and pregnant (N = 7) groups (control diet: 17% protein), and low-protein non-pregnant (N = 5) and pregnant (N = 6) groups (low-protein diet: 6%). Independent of the protein content of the diet, pregnancy increased total (F1,19 = 22.28, P < 0.001) and relative (F1,19 = 5.57, P < 0.03) food intake, the variation of weight (F1,19 = 49.79, P < 0.000) and final body weight (F1,19 = 19.52, P... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Low-protein diet; Pregnancy; Serum leptin; Serum insulin; Body adiposity. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000600014 |
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| Lubaczeuski,C.; Balbo,S.L.; Ribeiro,R.A.; Vettorazzi,J.F.; Santos-Silva,J.C.; Carneiro,E.M.; Bonfleur,M.L.. |
| The parasympathetic nervous system is important for β-cell secretion and mass regulation. Here, we characterized involvement of the vagus nerve in pancreatic β-cell morphofunctional regulation and body nutrient homeostasis in 90-day-old monosodium glutamate (MSG)-obese rats. Male newborn Wistar rats received MSG (4 g/kg body weight) or saline [control (CTL) group] during the first 5 days of life. At 30 days of age, both groups of rats were submitted to sham-surgery (CTL and MSG groups) or subdiaphragmatic vagotomy (Cvag and Mvag groups). The 90-day-old MSG rats presented obesity, hyperinsulinemia, insulin resistance, and hypertriglyceridemia. Their pancreatic islets hypersecreted insulin in response to glucose but did not increase insulin release upon... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Β-Cell; Obesity; Parasympathetic nervous system. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000500447 |
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