Background: Erratic regulation of glucose metabolism including hyperglycemia is a common condition of premature infants and is associated with increased morbidity and mortality. Objective: To examine histological and ultra-structural differences in the endocrine pancreas in fetal (throughout gestation) and neonatal baboons. Methods: Twelve fetal baboons were delivered at 125 days (d) gestational age (GA), 140dGA, or 175dGA. Eight animals were delivered at term (185dGA); half were fed for 5d. Seventy-three non-diabetic adult baboons were used for comparison. Pancreatic tissue was studied utilizing light microscopy, confocal imaging and electron microscopy. Results: The fetal and neonatal endocrine pancreas islet architecture became more organized as GA advanced. The percent areas of α-β-δ-cell type were similar within each fetal and newborn GA (NS), but were higher than the adults (P<0.05) regardless of GA. The ratio of β-cells within the islet (whole and core) increased with gestation (P<0.01). Neonatal baboons who survived for 5 days (feeding), had a 2.5-fold increase in pancreas weight compared to their counterparts euthanized at birth (P=0.01). Endocrine cells were found amongst exocrine ductal and acinar cells in 125,140 and 175dGA fetuses. Subpopulation of cells that co-expressed trypsin and glucagon/insulin show the presence of cells with mixed endo-exocrine lineage in fetuses. Conclusions: The fetal endocrine pancreas has no prevalence of a of α-β-δ-cell type with larger endocrine cell percent areas than adults. Cells with mixed endocrine/exocrine phenotype occur during fetal development. Developmental differences may play a role in glucose homeostasis during the neonatal period and may have long term implications.

The Ontogeny of the Endocrine Pancreas in the Fetal/Newborn Baboon / A.R. Quinn, C. Blanco, C. Perego, G. Finzi, S. La Rosa, C. Capella, R. Guardado-Mendoza, F. Casiraghi, A. Gastaldelli, M. Johnson, E. Dick, F. Folli. - In: JOURNAL OF ENDOCRINOLOGY. - ISSN 0022-0795. - 214:3(2012 Jun 21), pp. 289-299. [10.1530/JOE-12-0070]

The Ontogeny of the Endocrine Pancreas in the Fetal/Newborn Baboon

C. Perego;F. Folli
2012-06-21

Abstract

Background: Erratic regulation of glucose metabolism including hyperglycemia is a common condition of premature infants and is associated with increased morbidity and mortality. Objective: To examine histological and ultra-structural differences in the endocrine pancreas in fetal (throughout gestation) and neonatal baboons. Methods: Twelve fetal baboons were delivered at 125 days (d) gestational age (GA), 140dGA, or 175dGA. Eight animals were delivered at term (185dGA); half were fed for 5d. Seventy-three non-diabetic adult baboons were used for comparison. Pancreatic tissue was studied utilizing light microscopy, confocal imaging and electron microscopy. Results: The fetal and neonatal endocrine pancreas islet architecture became more organized as GA advanced. The percent areas of α-β-δ-cell type were similar within each fetal and newborn GA (NS), but were higher than the adults (P<0.05) regardless of GA. The ratio of β-cells within the islet (whole and core) increased with gestation (P<0.01). Neonatal baboons who survived for 5 days (feeding), had a 2.5-fold increase in pancreas weight compared to their counterparts euthanized at birth (P=0.01). Endocrine cells were found amongst exocrine ductal and acinar cells in 125,140 and 175dGA fetuses. Subpopulation of cells that co-expressed trypsin and glucagon/insulin show the presence of cells with mixed endo-exocrine lineage in fetuses. Conclusions: The fetal endocrine pancreas has no prevalence of a of α-β-δ-cell type with larger endocrine cell percent areas than adults. Cells with mixed endocrine/exocrine phenotype occur during fetal development. Developmental differences may play a role in glucose homeostasis during the neonatal period and may have long term implications.
Pancreas ; insulin ; islet of Langerhans
Settore BIO/09 - Fisiologia
Settore MED/13 - Endocrinologia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/178443
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