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Glynne PA, Picot J, Evans TJ. Coexpressed nitric oxide synthase and apical beta(1) integrins influence tubule cell adhesion after cytokine-induced injury. J Am Soc Nephrol. 2001;12(11):2370-2383doi: 10.1681/ASN.V12112370.
Glynne, P. A., Picot, J., & Evans, T. J. (2001). Coexpressed nitric oxide synthase and apical beta(1) integrins influence tubule cell adhesion after cytokine-induced injury. Journal of the American Society of Nephrology : JASN, 12(11), 2370-2383. https://doi.org/10.1681/ASN.V12112370
Glynne, Paul A, et al. "Coexpressed nitric oxide synthase and apical beta(1) integrins influence tubule cell adhesion after cytokine-induced injury." Journal of the American Society of Nephrology : JASN vol. 12,11 (2001): 2370-2383. doi: https://doi.org/10.1681/ASN.V12112370
Glynne PA, Picot J, Evans TJ. Coexpressed nitric oxide synthase and apical beta(1) integrins influence tubule cell adhesion after cytokine-induced injury. J Am Soc Nephrol. 2001 Nov;12(11):2370-2383. doi: 10.1681/ASN.V12112370. PMID: 11675413.
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J Am Soc Nephrol. 2001 Nov;12(11):2370-2383. doi: 10.1681/ASN.V12112370.

Coexpressed nitric oxide synthase and apical beta(1) integrins influence tubule cell adhesion after cytokine-induced injury.

Journal of the American Society of Nephrology : JASN

Paul A Glynne, Joanna Picot, Thomas J Evans

Affiliations

  1. Department of Infectious Diseases, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom.

PMID: 11675413 DOI: 10.1681/ASN.V12112370

Abstract

In sepsis-induced acute renal failure, actin cytoskeletal alterations result in shedding of proximal tubule epithelial cells (PTEC) and tubular obstruction. This study examined the hypothesis that inflammatory cytokines, released early in sepsis, cause PTEC cytoskeletal damage and alter integrin-dependent cell-matrix adhesion. The question of whether the intermediate nitric oxide (NO) modulates these cytokine effects was also examined. After exposure of human PTEC to tumor necrosis factor-alpha, interleukin-1 alpha, and interferon-gamma, the actin cytoskeleton was disrupted and cells became elongated, with extension of long filopodial processes. Cytokines induced shedding of viable, apoptotic, and necrotic PTEC, which was dependent on NO synthesized by inducible NO synthase (iNOS) produced as a result of cytokine actions on PTEC. Basolateral exposure of polarized PTEC monolayers to cytokines induced maximal NO-dependent cell shedding, mediated in part through NO effects on cGMP. Cell shedding was accompanied by dispersal of basolateral beta(1) integrins and E-cadherin, with corresponding upregulation of integrin expression in clusters of cells elevated above the epithelial monolayer. These cells demonstrated coexpression of iNOS and apically redistributed beta(1) integrins. Attachment studies demonstrated that the major ligand involved in cell anchorage was laminin, probably through interactions with the integrin alpha(3)beta(1). This interaction was downregulated by cytokines but was not dependent on NO. These studies provide a mechanism by which inflammatory cytokines induce PTEC damage in sepsis, in the absence of hypotension and ischemia. Future therapeutic strategies aimed at specific iNOS inhibition might inhibit PTEC shedding after cytokine-induced injury and delay the onset of acute renal failure in sepsis.

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