title: Gene expression and release of interleukin-8 by peritoneal macrophages and polymorphonuclear leukocytes during peritonitis in uremic patients on continuous ambulatory peritoneal dialysis.
abstract: Interleukin-8 (IL-8) has been reported to be released by activated peritoneal macrophages (PMs) and a variety of other cell types, and it exhibits potent chemotactic activity for polymorphonuclear cells (PMNs). We have previously shown that IL-8 is detectable in the drain dialysate of uremic patients on continuous ambulatory peritoneal dialysis (CAPD) during peritonitis. The levels of IL-8 in infected drain dialysate caused by different microorganisms were variable. In this study, we evaluated the gene expression and release of IL-8 by PMs and PMNs during peritonitis caused by Staphylococcus aureus in uremic patients on CAPD. IL-8 levels were variable in the drain dialysate at the different episodes of peritonitis, even in the same patient. The IL-8 levels were highly correlated with PMN count in drain dialysate (r = 0.9919, p < 0.001). PMs and PMNs obtained from drain dialysate at the onset of peritonitis increased mRNA expression for IL-8 and the amount of IL-8 mRNA from drainage cells was also highly correlated with PMN count. In contrast, cells isolated from drain dialysate without peritonitis failed to express mRNA for IL-8. These data suggest that increased expression of IL-8 may be a feature of peritonitis. The levels of IL-8 during peritonitis were not only related to the etiological microorganism but also to other unknown factor(s).
authors.affiliation: Department of Medical Research, Veterans General Hospital-Taipei, Taiwan, ROC.
authors.forename: C Y
authors.initials: CY
authors.lastname: Lin
authors.forename: T P
authors.initials: TP
authors.lastname: Huang
mesh_terms: D000328:Adult; D005260:Female; D015870:Gene Expression; D006801:Humans; D016209:Interleukin-8 / Q000235:genetics* / Q000378:metabolism*; D007676:Kidney Failure, Chronic / Q000150:complications / Q000378:metabolism / Q000628:therapy; D017737:Macrophages, Peritoneal / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009504:Neutrophils / Q000378:metabolism*; D010531:Peritoneal Dialysis, Continuous Ambulatory / Q000009:adverse effects*; D010538:Peritonitis / Q000150:complications / Q000378:metabolism* / Q000503:physiopathology*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013203:Staphylococcal Infections; D014511:Uremia / Q000150:complications / Q000378:metabolism* / Q000503:physiopathology*
chemical_list: D016209:Interleukin-8; D012333:RNA, Messenger