RESUMEN
Maternal nutrition during gestation has important effects on gene expression-mediated metabolic programming in offspring. To evaluate the effect of a protein-restricted maternal diet during gestation, pancreatic islets from male progeny of Wistar rats were studied at postnatal days (PND) 36 (juveniles) and 90 (young adults). The expression of key genes involved in ß-cell function and the DNA methylation pattern of the regulatory regions of two such genes, Pdx1 (pancreatic and duodenal homeobox 1) and MafA (musculoaponeurotic fibrosarcoma oncogene family, protein A), were investigated. Gene expression analysis in the pancreatic islets of restricted offspring showed significant differences compared with the control group at PND 36 (P < 0.05). The insulin 1 and 2 (Ins1 and Ins2), Glut2 (glucose transporter 2), Pdx1, MafA, and Atf2 (activating transcription factor 2), genes were upregulated, while glucokinase (Gck) and NeuroD1 (neuronal differentiation 1) were downregulated. Additionally, we studied whether the gene expression differences in Pdx1 and MafA between control and restricted offspring were associated with differential DNA methylation status in their regulatory regions. A decrease in the DNA methylation levels was found in the 5' flanking region between nucleotides -8118 to -7750 of the MafA regulatory region in restricted offspring compared with control pancreatic islets. In conclusion, low protein availability during gestation causes the upregulation of MafA gene expression in pancreatic ß-cells in the male juvenile offspring at least in part through DNA hypomethylation. This process may contribute to developmental dysregulation of ß-cell function and influence the long-term health of the offspring.
RESUMEN
A maternal low-protein (LP) diet programs fetal pancreatic islet ß-cell development and function and predisposes offspring to metabolic dysfunction later in life. We hypothesized that maternal protein restriction during pregnancy differentially alters ß- and α-cell populations in offspring by modifying islet ontogeny and function throughout life. We aimed to investigate the effect of an LP maternal diet on pancreatic islet morphology and cellular composition in female offspring on postnatal days (PNDs) 7, 14, 21, 36, and 110. Mothers were divided into 2 groups: during pregnancy, the control group (C) was fed a diet containing 20% casein, and the LP group was fed an isocaloric diet with 10% casein. Offspring pancreases were obtained at each PND and then processed. ß and α cells were detected by immunohistochemistry, and cellular area and islet size were quantified. Islet cytoarchitecture and total area were similar in C and LP offspring at all ages studied. At the early ages (PNDs 7-21), the proportion of ß cells was lower in LP than C offspring. The proportion of α cells was lower in LP than C offspring on PND 14 and higher on PND 21. The ß/α-cell ratio was lower in LP compared with C offspring on PNDs 7 and 21 and higher on PND 36 (being similar on PNDs 14 and 110). We concluded that maternal protein restriction during pregnancy modifies offspring islet cell ontogeny by altering the proportions of islet sizes and by reducing the number of ß cells postnatally, which may impact pancreatic function in adult life.
Asunto(s)
Dieta con Restricción de Proteínas/efectos adversos , Páncreas/crecimiento & desarrollo , Fenómenos Fisiológicos Nutricionales de los Animales , Animales , Femenino , Células Secretoras de Glucagón/citología , Células Secretoras de Insulina/citología , Células Secretoras de Insulina/fisiología , Islotes Pancreáticos/citología , Islotes Pancreáticos/crecimiento & desarrollo , Lactancia , Fenómenos Fisiologicos Nutricionales Maternos , Embarazo , Efectos Tardíos de la Exposición Prenatal , Ratas , Ratas Wistar , Maduración Sexual , DesteteRESUMEN
Nutrition during critical periods of development is one of the pivotal factors in establishing a lifelong healthy metabolism. Different nutritional deficiencies such as a low availability of proteins in the maternal diet produce alterations in offspring that include changes in insulin and glucose metabolism, a decrease in the size and number of cells of pancreatic islets of Langerhans, and premature ageing of the secretory function of pancreatic ß cells. Moreover, it has been reported that chronic nutritional stress is associated with epigenetic alterations in mechanisms of gene regulation during pancreatic development and function. These alterations can lead to dysfunctional states in pancreatic ß cells, which in the long run are responsible for the onset of metabolic diseases like type 2 diabetes. The present review summarizes the most important evidence in relation to the participation of epigenetic mechanisms in the regulation of gene expression during the intrauterine programming of the endocrine pancreas in animal models. Such mechanisms include DNA methylation as well as modifications of histones and microRNAs (miRNAs).