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Type: Artigo de periódico
Title: Ciliary Neurotrophic Factor Promotes Survival Of Neonatal Rat Islets Via The Bcl-2 Anti-apoptotic Pathway.
Author: Rezende, Luiz F
Stoppiglia, Luiz F
Souza, Kleber L A
Negro, Alessandro
Langone, Francesco
Boschero, Antonio C
Abstract: Ciliary neurotrophic factor (CNTF) belongs to the cytokine family and increases neuron differentiation and/or survival. Pancreatic islets are richly innervated and express receptors for nerve growth factors (NGFs) and may undergo neurotypic responses. CNTF is found in pancreatic islets and exerts paracrine effects in neighboring cells. The aim of this study was to investigate possible effects of CNTF on neonatal rat pancreatic islet differentiation and/or survival. For this purpose, we isolated pancreatic islets from neonatal rats (1-2 days old) by the collagenase method and cultured for 3 days in RPMI medium with (CNTF) or without (CTL) 1 nM CNTF. Thereafter, glucose-stimulated insulin secretion (RIA), general metabolism by (NAD(P)H production; MTS), glucose metabolism ((14)CO(2) production), gene (RT-PCR), protein expression (western blotting), caspase-3 activity (Asp-Glu-Val-Asp (DEVD)), and apoptosis (DNA fragmentation) were analyzed. Our results showed that CNTF-treated islets demonstrated reduced glucose-induced insulin secretion. CNTF treatment did not affect glucose metabolism, as well as the expression of mRNAs and proteins that are crucial for the secretory process. Conversely, CNTF significantly increased mRNA and protein levels related to cell survival, such as Cx36, PAX4, and BCL-2, reduced caspase-3 activity, and islet cells apoptosis, suggesting that CNTF does not affect islet cell differentiation and, instead, acts as a survival factor reducing apoptosis by increasing the expression of the anti-apoptotic BCL-2 protein and decreasing caspase-3 activity.
Subject: Animals
Blotting, Western
Caspase 3
Cell Differentiation
Cells, Cultured
Ciliary Neurotrophic Factor
Gene Expression
Islets Of Langerhans
Proto-oncogene Proteins C-bcl-2
Reverse Transcriptase Polymerase Chain Reaction
Bcl-2-associated X Protein
Citation: The Journal Of Endocrinology. v. 195, n. 1, p. 157-65, 2007-Oct.
Rights: fechado
Identifier DOI: 10.1677/JOE-07-0016
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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