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PACAP is expressed in secretory granules of insulin and glucagon cells in human and rodent pancreas - Evidence for generation of cAMP compartments uncoupled from hormone release in diabetic islets

In English

Författare

  • GM Portela-Gomes
  • A Lukinius
  • Otto Ljungberg
  • S Efendic
  • Bo Ahrén
  • SM Abdel-Halim

Summary, in English

Pituitary adenylate cyclase-activating polypeptide (PACAP) is an islet neuropeptide with potent insulinotropic action. The current study investigates PACAP expression in normal human and rat pancreatic islets, and whether it is altered in diabetic state. To that end, PACAP immunoreactivity was studied by immunofluorescence methods enhanced by the catalyzed reporter deposition (CARD) technique. Insulin and cyclic adenosine monophosphate (cAMP) generation induced by PACAP were investigated in islets isolated from the spontaneously diabetic Goto-Kakizaki (GK) rat. PACAP immunoreactivity was observed in virtually all insulin and glucagon cells in both species, but not in somatostatin or pancreatic polypeptide (PP) cells; this co-localization pattern was unaltered in diabetic pancreata. In normal human pancreas, PACAP was further localized ultrastructurally to the secretory granules of insulin and glucagon cells. PACAP significantly potentiated glucose-stimulated insulin release in isolated islets of normal but not of GK rats. PACAP failed to enhance cAMP generation in normal islets, but induced similar to 5-folds exaggeration in the diabetic islets. In conclusion, using improved immunocytochemistry techniques and electron microscopy (EM), PACAP was shown to be expressed both in normal and diabetic islet cells and localized to secretory granules of insulin and glucagon cells. Furthermore, the insulinotropic action of PACAP was markedly impaired in diabetic islets in spite of exaggerated cAMP response. (C) 2003 Elsevier Science B.V. All rights reserved.

Publiceringsår

2003

Språk

Engelska

Sidor

31-39

Publikation/Tidskrift/Serie

Regulatory Peptides

Volym

113

Issue

1-3

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Cell and Molecular Biology

Nyckelord

  • human
  • type-2 diabetes
  • pancreas
  • PACAP
  • cAMP
  • experimental diabetes

Status

Published

Forskningsgrupp

  • Pathology, Malmö

ISBN/ISSN/Övrigt

  • ISSN: 1873-1686