title: Impaired endotoxin-induced interleukin-1 beta secretion, not total production, of mononuclear cells from ESRD patients.
abstract: Lipopolysaccharide (LPS)-induced interleukin-1 beta (IL-1 beta) and tumor necrosis factor alpha (TNF alpha) production and secretion from peripheral blood mononuclear cells (PBMC) were determined in a longitudinal study with repeated measurements in PBMC from patients with chronic uremia not on hemodialysis (N = 8), end-stage renal disease (ESRD) patients (N = 8), and healthy controls (N = 7). ESRD patients were studied while using low-flux Cuprophan dialyzers and again using high-flux AN 69 dialyzers. Total (cell-associated plus secreted) LPS-induced IL-1 beta production was enhanced in uremic patients, but similar to controls in ESRD patients on Cuprophan. In contrast, LPS-induced IL-1 beta secretion (secreted amounts in % of total production) was similar to controls in uremic patients, but significantly reduced in ESRD patients on Cuprophan (P < 0.01). During AN 69 hemodialysis, LPS-induced total IL-1 beta production remained unchanged but IL-1 beta secretion increased significantly (P < 0.05) compared to Cuprophan dialysis. Increased IL-1 beta secretion coincided with a suppression in PGE2 synthesis (P < 0.02). Similarly, blockade of endogenous PGE2 by indomethacin increased LPS-induced IL-1 beta secretion (P < 0.01) but did not enhance total IL-1 beta production in PBMC from controls and patients on Cuprophan hemodialysis. Neither total production nor secretion of TNF alpha was different comparing the three study groups. We conclude that LPS-induced IL-1 beta secretion, but not total production, is impaired in PBMC from ESRD patients on long-term Cuprophan hemodialysis. This functional change in the PBMC response is specific for IL-1 beta, not due to uremia per se but hemodialysis-dependent and reversible. Hemodialysis with AN 69 suppresses endogenous PGE2 synthesis in PBMC which is associated with increased LPS-induced IL-1 beta secretion in the presence of unchanged total IL-1 beta production. We speculate that PGE2 could inactivate the IL-1 beta converting enzyme which is essential for processing and secretion of mature IL-1 beta.
authors.affiliation: Department of Nephrology, Medizinische Hochschule Hannover, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Lonnemann
authors.forename: I
authors.initials: I
authors.lastname: Barndt
authors.forename: V
authors.initials: V
authors.lastname: Kaever
authors.forename: M
authors.initials: M
authors.lastname: Haubitz
authors.forename: R
authors.initials: R
authors.lastname: Schindler
authors.forename: S
authors.initials: S
authors.lastname: Shaldon
authors.forename: K M
authors.initials: KM
authors.lastname: Koch
mesh_terms: D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D015232:Dinoprostone / Q000096:biosynthesis; D005260:Female; D006801:Humans; D007213:Indomethacin / Q000494:pharmacology; D007375:Interleukin-1 / Q000096:biosynthesis* / Q000097:blood; D007676:Kidney Failure, Chronic / Q000097:blood* / Q000209:etiology / Q000473:pathology / Q000628:therapy; D007963:Leukocytes, Mononuclear / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011863:Radioimmunoassay; D006435:Renal Dialysis; D014409:Tumor Necrosis Factor-alpha / Q000096:biosynthesis* / Q000187:drug effects; D014511:Uremia / Q000097:blood* / Q000150:complications / Q000473:pathology
chemical_list: D007375:Interleukin-1; D008070:Lipopolysaccharides; D014409:Tumor Necrosis Factor-alpha; D015232:Dinoprostone; D007213:Indomethacin