Linked Life Data

12686458

Source:http://linkedlifedata.com/resource/pubmed/id/12686458

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-3
pubmed:dateCreated
2003-4-10
pubmed:abstractText
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 approximately 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.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0167-0115
pubmed:author
pubmed:issnType
Print
pubmed:day
15
pubmed:volume
113
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
31-9
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed-meshheading:12686458-Animals, pubmed-meshheading:12686458-Cyclic AMP, pubmed-meshheading:12686458-Diabetes Mellitus, Type 2, pubmed-meshheading:12686458-Disease Models, Animal, pubmed-meshheading:12686458-Dose-Response Relationship, Drug, pubmed-meshheading:12686458-Forskolin, pubmed-meshheading:12686458-Glucagon, pubmed-meshheading:12686458-Glucose, pubmed-meshheading:12686458-Humans, pubmed-meshheading:12686458-Immunohistochemistry, pubmed-meshheading:12686458-Insulin, pubmed-meshheading:12686458-Islets of Langerhans, pubmed-meshheading:12686458-Male, pubmed-meshheading:12686458-Microscopy, Immunoelectron, pubmed-meshheading:12686458-Neuropeptides, pubmed-meshheading:12686458-Pancreas, pubmed-meshheading:12686458-Pituitary Adenylate Cyclase-Activating Polypeptide, pubmed-meshheading:12686458-Rats, pubmed-meshheading:12686458-Rats, Wistar
pubmed:year
2003
pubmed:articleTitle
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.
pubmed:affiliation
Center of Gastroenterology and Center of Nutrition, Lisbon University, Portugal. portela_gomes@yahoo.com
pubmed:publicationType
Journal Article, Comparative Study, In Vitro, Research Support, Non-U.S. Gov't