Nitric oxide synthase isoforms play distinct roles during acute peritonitis
Identifieur interne : 000D91 ( Main/Exploration ); précédent : 000D90; suivant : 000D92Nitric oxide synthase isoforms play distinct roles during acute peritonitis
Auteurs : Jie Ni [Belgique] ; Rachel M. Mcloughlin [Royaume-Uni] ; Alexandre Brodovitch [Belgique] ; Pierre Moulin [Belgique] ; Peter Brouckaert [Belgique] ; Barbara Casadei [Royaume-Uni] ; Olivier Feron [Belgique] ; Nicholas Topley [Royaume-Uni] ; Jean-Luc. Balligand [Belgique] ; Olivier Devuyst [Belgique]Source :
- Nephrology Dialysis Transplantation [ 0931-0509 ] ; 2010-01.
Abstract
Background. Acute peritonitis is the most frequent complication of peritoneal dialysis (PD). Increased nitric oxide (NO) release by NO synthase (NOS) isoforms has been implicated in acute peritonitis, but the role played by the NOS isoforms expressed in the peritoneum is unknown. Methods. We investigated the structural and functional consequences of acute peritonitis induced by LPS in wild-type (WT) mice versus knockout mice (KO) for the endothelial NOS (eNOS), the inducible NOS (iNOS) or the neuronal NOS (nNOS). Results. The level of NO metabolites (NOx) in the dialysate was maximal 18 h after LPS injection. LPS induced a significant increase in the transport of small solutes and decreased ultrafiltration in WT mice. These changes, which occurred without vascular proliferation, were paralleled by the upregulation of nNOS and eNOS, and the induction of iNOS. The transport modifications induced by LPS were significantly reversed in eNOS KO mice, but not modified in mice lacking iNOS or nNOS. In contrast, the increase of dialysate NOx was abolished in iNOS KO mice and significantly reduced in eNOS KO mice, but left unchanged in mice lacking nNOS. Mice lacking iNOS also showed more severe inflammatory changes, and a trend towards increased mortality following LPS. Conclusion. These data demonstrate specific roles for NOS isoforms in the peritoneal membrane and suggest that selective eNOS inhibition may improve peritoneal transport during acute peritonitis.
Url:
DOI: 10.1093/ndt/gfp415
Affiliations:
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Acute peritonitis is the most frequent complication of peritoneal dialysis (PD). Increased nitric oxide (NO) release by NO synthase (NOS) isoforms has been implicated in acute peritonitis, but the role played by the NOS isoforms expressed in the peritoneum is unknown. Methods. We investigated the structural and functional consequences of acute peritonitis induced by LPS in wild-type (WT) mice versus knockout mice (KO) for the endothelial NOS (eNOS), the inducible NOS (iNOS) or the neuronal NOS (nNOS). Results. The level of NO metabolites (NOx) in the dialysate was maximal 18 h after LPS injection. LPS induced a significant increase in the transport of small solutes and decreased ultrafiltration in WT mice. These changes, which occurred without vascular proliferation, were paralleled by the upregulation of nNOS and eNOS, and the induction of iNOS. The transport modifications induced by LPS were significantly reversed in eNOS KO mice, but not modified in mice lacking iNOS or nNOS. In contrast, the increase of dialysate NOx was abolished in iNOS KO mice and significantly reduced in eNOS KO mice, but left unchanged in mice lacking nNOS. Mice lacking iNOS also showed more severe inflammatory changes, and a trend towards increased mortality following LPS. Conclusion. These data demonstrate specific roles for NOS isoforms in the peritoneal membrane and suggest that selective eNOS inhibition may improve peritoneal transport during acute peritonitis.</div></front></TEI><affiliations><list><country><li>Belgique</li><li>Royaume-Uni</li></country><region><li>Angleterre</li><li>Oxfordshire</li><li>Région de Bruxelles-Capitale</li></region><settlement><li>Bruxelles</li><li>Oxford</li></settlement></list><tree><country name="Belgique"><region name="Région de Bruxelles-Capitale"><name sortKey="Ni, Jie" sort="Ni, Jie" uniqKey="Ni J" first="Jie" last="Ni">Jie Ni</name></region><name sortKey="Balligand, Jean Luc" sort="Balligand, Jean Luc" uniqKey="Balligand J" first="Jean-Luc." last="Balligand">Jean-Luc. Balligand</name><name sortKey="Brodovitch, Alexandre" sort="Brodovitch, Alexandre" uniqKey="Brodovitch A" first="Alexandre" last="Brodovitch">Alexandre Brodovitch</name><name sortKey="Brouckaert, Peter" sort="Brouckaert, Peter" uniqKey="Brouckaert P" first="Peter" last="Brouckaert">Peter Brouckaert</name><name sortKey="Devuyst, Olivier" sort="Devuyst, Olivier" uniqKey="Devuyst O" first="Olivier" last="Devuyst">Olivier Devuyst</name><name sortKey="Feron, Olivier" sort="Feron, Olivier" uniqKey="Feron O" first="Olivier" last="Feron">Olivier Feron</name><name sortKey="Moulin, Pierre" sort="Moulin, Pierre" uniqKey="Moulin P" first="Pierre" last="Moulin">Pierre Moulin</name></country><country name="Royaume-Uni"><noRegion><name sortKey="Mcloughlin, Rachel M" sort="Mcloughlin, Rachel M" uniqKey="Mcloughlin R" first="Rachel M." last="Mcloughlin">Rachel M. Mcloughlin</name></noRegion><name sortKey="Casadei, Barbara" sort="Casadei, Barbara" uniqKey="Casadei B" first="Barbara" last="Casadei">Barbara Casadei</name><name sortKey="Topley, Nicholas" sort="Topley, Nicholas" uniqKey="Topley N" first="Nicholas" last="Topley">Nicholas Topley</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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