PMID: 2498883Jun 1, 1989Paper

Intercellular adhesion molecule 1 is induced on isolated endocrine islet cells by cytokines but not by reovirus infection

Proceedings of the National Academy of Sciences of the United States of America
I L CampbellL C Harrison

Abstract

The selective destruction of the pancreatic islet beta cells in type 1 diabetes mellitus is thought to be mediated by a cellular autoimmune process, possibly triggered by virus infection in genetically susceptible individuals. Because of the potentially important role of cell-cell adhesion in the immune response, we investigated whether cytokine products of mononuclear cells, or virus infection, induced the expression of intercellular adhesion molecule 1 (ICAM-1) on human endocrine islet cells. By flow cytofluorimetry, control islet cells did not express detectable ICAM-1. However, after a 72-hr exposure of islets to interferon gamma (IFN-gamma) and/or tumor necrosis factor alpha (TNF-alpha) (each at 250 units/ml), ICAM-1 was induced on greater than 85% of islet cells. IFN-gamma was 50% more potent than TNF-alpha; together, their effects were additive. Class I major histocompatibility complex (MHC) protein expression, detected on control islet cells, was also stimulated by IFN-gamma and/or TNF-alpha. In contrast, infection with reovirus type 3 did not induce ICAM-1 on islet cells, although it stimulated the expression of class I MHC proteins. By double-label indirect immunofluorescence microscopy, ICAM-1 expression was identifi...Continue Reading

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