Global deficits in development, function, and gene expression in the endocrine pancreas in a deletion mouse model of Prader-Willi syndrome

Mihaela Stefan, Rebecca A. Simmons, Suzanne Bertera, Massimo Trucco, Farzad Esni, Peter Drain, Robert D. Nicholls

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Prader-Willi syndrome (PWS) is a multisystem disorder caused by genetic loss of function of a cluster of imprinted, paternally expressed genes. Neonatal failure to thrive in PWS is followed by childhood-onset hyperphagia and obesity among other endocrine and behavioral abnormalities. PWS is typically assumed to be caused by an unknown hypothalamic-pituitary dysfunction, but the underlying pathogenesis remains unknown. A transgenic deletion mouse model (TgPWS) has severe failure to thrive, with very low levels of plasma insulin and glucagon in fetal and neonatal life prior to and following onset of progressive hypoglycemia. In this study, we tested the hypothesis that primary deficits in pancreatic islet development or function may play a fundamental role in the TgPWS neonatal phenotype. Major pancreatic islet hormones (insulin, glucagon) were decreased in TgPWS mice, consistent with plasma levels. Immunohistochemical analysis of the pancreas demonstrated disrupted morphology of TgPWS islets, with reduced α- and β-cell mass arising from an increase in apoptosis. Furthermore, in vivo and in vitro studies show that the rate of insulin secretion is significantly impaired in TgPWS β-cells. In TgPWS pancreas, mRNA levels for genes encoding all pancreatic hormones, other secretory factors, and the ISL1 transcription factor are upregulated by either a compensatory response to plasma hormone deficiencies or a primary effect of a deleted gene. Our findings identify a cluster of imprinted genes required for the development, survival, coordinate regulation of genes encoding hormones, and secretory function of pancreatic endocrine cells, which may underlie the neonatal phenotype of the TgPWS mouse model.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume300
Issue number5
DOIs
StatePublished - May 2011
Externally publishedYes

Fingerprint

Prader-Willi Syndrome
Islets of Langerhans
Pancreatic Hormones
Gene Expression
Failure to Thrive
Insulin
Glucagon
Genes
Pancreas
Hormones
Phenotype
Hyperphagia
Inborn Genetic Diseases
Endocrine Cells
Pediatric Obesity
Multigene Family
Hypoglycemia
Transgenic Mice
Transcription Factors
Apoptosis

Keywords

  • α-cell
  • β-cell
  • Genomic imprinting
  • Hypoglycemia

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Physiology
  • Physiology (medical)

Cite this

Global deficits in development, function, and gene expression in the endocrine pancreas in a deletion mouse model of Prader-Willi syndrome. / Stefan, Mihaela; Simmons, Rebecca A.; Bertera, Suzanne; Trucco, Massimo; Esni, Farzad; Drain, Peter; Nicholls, Robert D.

In: American Journal of Physiology - Endocrinology and Metabolism, Vol. 300, No. 5, 05.2011.

Research output: Contribution to journalArticle

Stefan, Mihaela ; Simmons, Rebecca A. ; Bertera, Suzanne ; Trucco, Massimo ; Esni, Farzad ; Drain, Peter ; Nicholls, Robert D. / Global deficits in development, function, and gene expression in the endocrine pancreas in a deletion mouse model of Prader-Willi syndrome. In: American Journal of Physiology - Endocrinology and Metabolism. 2011 ; Vol. 300, No. 5.
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