title: Anti-inflammatory effects of phosphatidylcholine in neutrophil leukocyte-dependent acute arthritis in rats.
abstract: We investigated the effects of exogenous phosphatidylcholine (PC) and non-steroidal diclofenac supplementation on polymorphonuclear cell influx in carrageenan-induced arthritis in rats. The microcirculatory consequences were evaluated by a novel method developed for direct intravital microscopic observation of the synovial membrane. Arthritis was induced by injection of a mixture of 2% lambda-carrageenan and 4% kaolin into the knee joints and the animals were treated orally with PC (150 mg/kg twice daily), sodium diclofenac (0.5mg/kg twice daily) or saline vehicle. Intravital videomicroscopy was used to investigate the leukocyte-endothelial interactions directly in the synovial membrane at 6h after the challenge. The inflammation-induced thermal and mechanical secondary hyperalgesic reactions were assessed at 24h, and the knee volume changes at 48h after the insult. The development of arthritis was accompanied by a significant increase in the number of adherent leukocytes in the synovial postcapillary venules, but this increase was reduced significantly (by approximately 40%) by PC, and slightly (by 22%) by diclofenac treatment. The perivascular infiltration of the neutrophil leukocytes and the intercellular adhesion molecule-1 (ICAM-1) expressions were reduced only by PC treatment. The significant decrease (45%) in the thermal nociceptive latency, the 3-fold increase in the mechanical touch sensitivity and the knee cross-sectional area (which was increased by 35% by the arthritis induction) were significantly ameliorated by both treatments. The present study demonstrated the anti-inflammatory effects of PC in experimental arthritis. The therapeutic potential may be linked to the reduction of neutrophil leukocyte-mediated microcirculatory inflammatory reactions.
authors.affiliation: Institute of Surgical Research, University of Szeged, Szeged, Pécsi u. 6, Hungary.
authors.forename: Petra
authors.initials: P
authors.lastname: Hartmann
authors.forename: Andrea
authors.initials: A
authors.lastname: Szabó
authors.forename: Gábor
authors.initials: G
authors.lastname: Eros
authors.forename: Dóra
authors.initials: D
authors.lastname: Gurabi
authors.forename: Gyöngyi
authors.initials: G
authors.lastname: Horváth
authors.forename: István
authors.initials: I
authors.lastname: Németh
authors.forename: Miklós
authors.initials: M
authors.lastname: Ghyczy
authors.forename: Mihály
authors.initials: M
authors.lastname: Boros
mesh_terms: D000818:Animals; D000893:Anti-Inflammatory Agents / Q000494:pharmacology* / Q000627:therapeutic use; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology / Q000627:therapeutic use; D001168:Arthritis / Q000188:drug therapy* / Q000276:immunology* / Q000503:physiopathology; D004008:Diclofenac / Q000494:pharmacology / Q000627:therapeutic use; D006930:Hyperalgesia / Q000276:immunology / Q000503:physiopathology; D007719:Knee Joint / Q000187:drug effects / Q000473:pathology; D008297:Male; D008833:Microcirculation / Q000187:drug effects; D009504:Neutrophils / Q000187:drug effects* / Q000276:immunology*; D010713:Phosphatidylcholines / Q000494:pharmacology* / Q000627:therapeutic use; D051381:Rats; D017208:Rats, Wistar; D013583:Synovial Membrane / Q000098:blood supply / Q000187:drug effects
chemical_list: D000893:Anti-Inflammatory Agents; D000894:Anti-Inflammatory Agents, Non-Steroidal; D010713:Phosphatidylcholines; D004008:Diclofenac