Journal article
Integration of pro-inflammatory cytokines, 12-lipoxygenase and NOX-1 in pancreatic islet beta cell dysfunction
Molecular and cellular endocrinology, Vol.358(1), pp.88-95
07/06/2012
DOI: 10.1016/j.mce.2012.03.004
PMID: 22502743
Abstract
► Inflammatory cytokines elevate reactive species, 12-LO and induce islet dysfunction. ► NADPH oxidase 1 is induced in islets and beta cell lines by inflammatory cytokines. ► Inhibitors of NADPH oxidase preserve markers of beta cell function. ► 12-LO activates islet NOX-1 and inhibitors of 12-LO block cytokine induced NOX-1. ► Integrated pathway of inflammatory cytokine-induced beta cell dysfunction identified.
Elevated cellular reactive species, which can be produced by diabetic serum conditions such as elevated inflammatory cytokines, lipotoxicity or glucotoxicity contribute to islet beta cell dysfunction and cell death. Cellular pathways that result in beta cell oxidative stress are poorly resolved. In this study, stimulation of human donor islets, primary mouse islets or homogeneous beta cell lines with a cocktail of inflammatory cytokines (TNFα, IL-1β, and INFγ) significantly induced NADPH oxidase-1 (NOX-1) gene expression (p<0.05). This pro-inflammatory cytokine cocktail concomitantly induced loss of islet glucose stimulated insulin response (p<0.05), elevated expression of MCP-1 (p<0.01), increased cellular reactive oxygen species (ROS) and induced cell death. Inhibitors of NADPH oxidase, apocynin and diphenyleneiodonium, and a dual selective NOX1/4 inhibitor, blocked ROS generation (p<0.01) and induction of MCP-1 (p<0.05) by pro-inflammatory cytokines in beta cells. It has previously been reported that pro-inflammatory cytokine stimulation induces 12-lipoxygenase (12-LO) expression in human islets. 12-Hydroxyeicosatetraenoic acid (12-HETE), a product of 12-LO activity, stimulated NOX-1 expression in human islets (p<0.05). A novel selective inhibitor of 12-LO blocked induction of NOX-1, production of ROS and pro-caspase 3 cleavage by pro-inflammatory cytokines in INS-1 beta cells (p<0.01). Inhibition was not seen with a structurally related but inactive analog. Importantly, islets from human type 2 diabetic donors have an elevated expression of NOX-1 (p<0.05). This study describes an integrated pathway in beta cells that links beta cell dysfunction induced by pro-inflammatory cytokines with 12-lipoxygenase and NADPH oxidase (NOX-1) activation. Inhibitors of this pathway may provide a new therapeutic strategy to preserve beta cell mass in diabetes.
Details
- Title: Subtitle
- Integration of pro-inflammatory cytokines, 12-lipoxygenase and NOX-1 in pancreatic islet beta cell dysfunction
- Creators
- Jessica R Weaver - Strelitz Diabetes Center, Eastern Virginia Medical School, Norfolk, VA, United StatesTheodore R Holman - Department of Biochemistry, University of California Santa Cruz, Santa Cruz, CA, United StatesYumi Imai - Strelitz Diabetes Center, Eastern Virginia Medical School, Norfolk, VA, United StatesAjit Jadhav - NIH Chemical Genomics Center, Bethesda, MD, United StatesVictor Kenyon - Department of Biochemistry, University of California Santa Cruz, Santa Cruz, CA, United StatesDavid J Maloney - NIH Chemical Genomics Center, Bethesda, MD, United StatesJerry L Nadler - Strelitz Diabetes Center, Eastern Virginia Medical School, Norfolk, VA, United StatesGanesha Rai - NIH Chemical Genomics Center, Bethesda, MD, United StatesAnton Simeonov - NIH Chemical Genomics Center, Bethesda, MD, United StatesDavid A Taylor-Fishwick - Strelitz Diabetes Center, Eastern Virginia Medical School, Norfolk, VA, United States
- Resource Type
- Journal article
- Publication Details
- Molecular and cellular endocrinology, Vol.358(1), pp.88-95
- DOI
- 10.1016/j.mce.2012.03.004
- PMID
- 22502743
- NLM abbreviation
- Mol Cell Endocrinol
- ISSN
- 0303-7207
- eISSN
- 1872-8057
- Publisher
- Elsevier Ireland Ltd
- Language
- English
- Date published
- 07/06/2012
- Academic Unit
- Endocrinology and Metabolism; Internal Medicine
- Record Identifier
- 9984094593502771
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