Obestatin promotes survival of pancreatic β-cells and human islets and induces expression of genes involved in the regulation of β-cell mass and function

Riccarda Granata, Fabio Settanni, Davide Gallo, Letizia Trovato, Luigi Biancone, Vincenzo Cantaluppi, Rita Nano, Marta Annunziata, Pietro Campiglia, Elisa Arnoletti, Corrado Ghé, Marco Volante, Mauro Papotti, Giampiero Muccioli, Ezio Ghigo

Research output: Contribution to journalArticle

159 Citations (Scopus)

Abstract

OBJECTIVE-Obestatin is a newly discovered peptide encoded by the ghrelin gene whose biological functions are poorly understood. We investigated obestatin effect on survival of β-cells and human pancreatic islets and the underlying signaling pathways. RESEARCH DESIGN AND METHODS-β-cells and human islets were used to assess obestatin effect on cell proliferation, survival, apoptosis, intracellular signaling, and gene expression. RESULTS-Obestatin showed specific binding on HIT-T15 and INS-1E β-cells, bound to glucagon-like peptide-1 receptor (GLP-1R), and recognized ghrelin binding sites. Obestatin exerted proliferative, survival, and antiapoptotic effects under serum-deprived conditions and interferon-γ/tumor necrosis ffactor-α/ interleukin-1β treatment, particularly at pharmacological concentrations. Ghrelin receptor antagonist [D-Lys3]-growth hormone releasing peptide-6 and anti-ghrelin antibody prevented obestatin-induced survival in β-cells and human islets. β-cells and islet cells released obestatin, and addition of anti-obestatin antibody reduced their viability. Obestatin increased β-cell cAMP and activated extracellular signal-related kinase 1/2 (ERK1/2) and phosphatidylinositol 3-kinase (PI 3-kinase)/Akt; its antiapoptotic effect was blocked by inhibition of adenylyl cyclase/cAMP/ protein kinase A (PKA), Pi 3-kinase/Akt, and ERK1/2 signaling. Moreover, obestatin upregulated GLP-1R mRNA and insulin receptor substrate-2 (IRS-2) expression and phosphorylation. The GLP-1R antagonist exendin-(9-39) reduced obestatin effect on β-cell survival. In human islets, obestatin, whose immunore-activity colocalized with that of ghrelin, promoted cell survival and blocked cytokine-induced apoptosis through cAMP increase and involvement of adenylyl cyclase/cAMP/PKA signaling. Moreover, obestatin 1) induced PI 3-kinase/Akt, ERK1/2, and also cAMP response element-binding protein phosphorylation; 2) stimulated insulin secretion and gene expression; and 3) upregu-lated GLP-1R, IRS-2, pancreatic and duodenal homeobox-1, and glucokinase mRNA. CONCLUSIONS-These results indicate that obestatin promotes β-cell and human islet cell survival and stimulates the expression of main regulatory β-cell genes, identifying a new role for this peptide within the endocrine pancreas.

Original languageEnglish
Pages (from-to)967-979
Number of pages13
JournalDiabetes
Volume57
Issue number4
DOIs
Publication statusPublished - Apr 2008

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Ghrelin
Islets of Langerhans
Cell Survival
Gene Expression
Phosphotransferases
Phosphatidylinositol 3-Kinase
Insulin Receptor Substrate Proteins
Cyclic AMP-Dependent Protein Kinases
Adenylyl Cyclases
Anti-Idiotypic Antibodies
Phosphorylation
Ghrelin Receptor
Apoptosis
Glucokinase
Cyclic AMP Response Element-Binding Protein
Messenger RNA
Peptides
Homeobox Genes
Regulator Genes

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Internal Medicine

Cite this

Obestatin promotes survival of pancreatic β-cells and human islets and induces expression of genes involved in the regulation of β-cell mass and function. / Granata, Riccarda; Settanni, Fabio; Gallo, Davide; Trovato, Letizia; Biancone, Luigi; Cantaluppi, Vincenzo; Nano, Rita; Annunziata, Marta; Campiglia, Pietro; Arnoletti, Elisa; Ghé, Corrado; Volante, Marco; Papotti, Mauro; Muccioli, Giampiero; Ghigo, Ezio.

In: Diabetes, Vol. 57, No. 4, 04.2008, p. 967-979.

Research output: Contribution to journalArticle

Granata, R, Settanni, F, Gallo, D, Trovato, L, Biancone, L, Cantaluppi, V, Nano, R, Annunziata, M, Campiglia, P, Arnoletti, E, Ghé, C, Volante, M, Papotti, M, Muccioli, G & Ghigo, E 2008, 'Obestatin promotes survival of pancreatic β-cells and human islets and induces expression of genes involved in the regulation of β-cell mass and function', Diabetes, vol. 57, no. 4, pp. 967-979. https://doi.org/10.2337/db07-1104
Granata, Riccarda ; Settanni, Fabio ; Gallo, Davide ; Trovato, Letizia ; Biancone, Luigi ; Cantaluppi, Vincenzo ; Nano, Rita ; Annunziata, Marta ; Campiglia, Pietro ; Arnoletti, Elisa ; Ghé, Corrado ; Volante, Marco ; Papotti, Mauro ; Muccioli, Giampiero ; Ghigo, Ezio. / Obestatin promotes survival of pancreatic β-cells and human islets and induces expression of genes involved in the regulation of β-cell mass and function. In: Diabetes. 2008 ; Vol. 57, No. 4. pp. 967-979.
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T1 - Obestatin promotes survival of pancreatic β-cells and human islets and induces expression of genes involved in the regulation of β-cell mass and function

AU - Granata, Riccarda

AU - Settanni, Fabio

AU - Gallo, Davide

AU - Trovato, Letizia

AU - Biancone, Luigi

AU - Cantaluppi, Vincenzo

AU - Nano, Rita

AU - Annunziata, Marta

AU - Campiglia, Pietro

AU - Arnoletti, Elisa

AU - Ghé, Corrado

AU - Volante, Marco

AU - Papotti, Mauro

AU - Muccioli, Giampiero

AU - Ghigo, Ezio

PY - 2008/4

Y1 - 2008/4

N2 - OBJECTIVE-Obestatin is a newly discovered peptide encoded by the ghrelin gene whose biological functions are poorly understood. We investigated obestatin effect on survival of β-cells and human pancreatic islets and the underlying signaling pathways. RESEARCH DESIGN AND METHODS-β-cells and human islets were used to assess obestatin effect on cell proliferation, survival, apoptosis, intracellular signaling, and gene expression. RESULTS-Obestatin showed specific binding on HIT-T15 and INS-1E β-cells, bound to glucagon-like peptide-1 receptor (GLP-1R), and recognized ghrelin binding sites. Obestatin exerted proliferative, survival, and antiapoptotic effects under serum-deprived conditions and interferon-γ/tumor necrosis ffactor-α/ interleukin-1β treatment, particularly at pharmacological concentrations. Ghrelin receptor antagonist [D-Lys3]-growth hormone releasing peptide-6 and anti-ghrelin antibody prevented obestatin-induced survival in β-cells and human islets. β-cells and islet cells released obestatin, and addition of anti-obestatin antibody reduced their viability. Obestatin increased β-cell cAMP and activated extracellular signal-related kinase 1/2 (ERK1/2) and phosphatidylinositol 3-kinase (PI 3-kinase)/Akt; its antiapoptotic effect was blocked by inhibition of adenylyl cyclase/cAMP/ protein kinase A (PKA), Pi 3-kinase/Akt, and ERK1/2 signaling. Moreover, obestatin upregulated GLP-1R mRNA and insulin receptor substrate-2 (IRS-2) expression and phosphorylation. The GLP-1R antagonist exendin-(9-39) reduced obestatin effect on β-cell survival. In human islets, obestatin, whose immunore-activity colocalized with that of ghrelin, promoted cell survival and blocked cytokine-induced apoptosis through cAMP increase and involvement of adenylyl cyclase/cAMP/PKA signaling. Moreover, obestatin 1) induced PI 3-kinase/Akt, ERK1/2, and also cAMP response element-binding protein phosphorylation; 2) stimulated insulin secretion and gene expression; and 3) upregu-lated GLP-1R, IRS-2, pancreatic and duodenal homeobox-1, and glucokinase mRNA. CONCLUSIONS-These results indicate that obestatin promotes β-cell and human islet cell survival and stimulates the expression of main regulatory β-cell genes, identifying a new role for this peptide within the endocrine pancreas.

AB - OBJECTIVE-Obestatin is a newly discovered peptide encoded by the ghrelin gene whose biological functions are poorly understood. We investigated obestatin effect on survival of β-cells and human pancreatic islets and the underlying signaling pathways. RESEARCH DESIGN AND METHODS-β-cells and human islets were used to assess obestatin effect on cell proliferation, survival, apoptosis, intracellular signaling, and gene expression. RESULTS-Obestatin showed specific binding on HIT-T15 and INS-1E β-cells, bound to glucagon-like peptide-1 receptor (GLP-1R), and recognized ghrelin binding sites. Obestatin exerted proliferative, survival, and antiapoptotic effects under serum-deprived conditions and interferon-γ/tumor necrosis ffactor-α/ interleukin-1β treatment, particularly at pharmacological concentrations. Ghrelin receptor antagonist [D-Lys3]-growth hormone releasing peptide-6 and anti-ghrelin antibody prevented obestatin-induced survival in β-cells and human islets. β-cells and islet cells released obestatin, and addition of anti-obestatin antibody reduced their viability. Obestatin increased β-cell cAMP and activated extracellular signal-related kinase 1/2 (ERK1/2) and phosphatidylinositol 3-kinase (PI 3-kinase)/Akt; its antiapoptotic effect was blocked by inhibition of adenylyl cyclase/cAMP/ protein kinase A (PKA), Pi 3-kinase/Akt, and ERK1/2 signaling. Moreover, obestatin upregulated GLP-1R mRNA and insulin receptor substrate-2 (IRS-2) expression and phosphorylation. The GLP-1R antagonist exendin-(9-39) reduced obestatin effect on β-cell survival. In human islets, obestatin, whose immunore-activity colocalized with that of ghrelin, promoted cell survival and blocked cytokine-induced apoptosis through cAMP increase and involvement of adenylyl cyclase/cAMP/PKA signaling. Moreover, obestatin 1) induced PI 3-kinase/Akt, ERK1/2, and also cAMP response element-binding protein phosphorylation; 2) stimulated insulin secretion and gene expression; and 3) upregu-lated GLP-1R, IRS-2, pancreatic and duodenal homeobox-1, and glucokinase mRNA. CONCLUSIONS-These results indicate that obestatin promotes β-cell and human islet cell survival and stimulates the expression of main regulatory β-cell genes, identifying a new role for this peptide within the endocrine pancreas.

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