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  • Title: Phospholipid metabolism in polymorphonuclear leukocytes from rheumatoid arthritis patients: effects of non-steroidal anti-inflammatory agents and clotrimazole.
    Author: Smith DM, Gonzales H, Johnson JA, Franson RC, Turner RA.
    Journal: Int J Immunopharmacol; 1989; 11(1):45-55. PubMed ID: 2540099.
    Abstract:
    Arachidonic acid (AA) metabolism and phospholipase A2 (PLA2) activity were measured in the peripheral blood polymorphonuclear leukocytes (PMNL) from ten patients with rheumatoid arthritis (RA) on treatment with various non-steroidal anti-inflammatory agents (NSAIA). AA metabolism and PLA2 activity were measured both initially and after treatment with either placebo or Clotrimazole, a broad spectrum anti-mycotic agent, as a possible anti-rheumatic drug. AA metabolism was also measured in PMNL from ten patients with active RA untreated with any NSAIA and ten normal volunteers. Using 3H-AA prelabeled cells, we show that there was a significantly higher (P less than 0.025) production of 3H-LTB4 in response to stimulation with the calcium ionophore A23187 in untreated RA patients than in normal volunteers (mean +/- S.D.:4.8 +/- 1.6% and 3.1 +/- 1.0%, respectively). The production of 3H-LTB4 by PMNL from patients on NSAIAs was less elevated (mean +/- S.D.:4.1 +/- 1.5%) and was not significantly different from normal controls. Concurrently we examined PLA2 activity in PMNL-sonicates from ten of our study patients using autoclaved [14C]oleate-labeled E. coli biomembranes as an exogenous substrate. Using linear regression analysis, we demonstrate a significant correlation between in vitro PLA2 activity and the release of 3H-AA from the cellular phospholipids (deacylation) in response to A23187 stimulation (r = -0.526, P less than 0.025). We also demonstrate significant correlations between the overall clinical state of the RA patient, as evaluated by a modified rheumatoid activity index (MRAI), and both the release of 3H-AA from the cellular phospholipids and its production of total [3H]eicosanoids (r = -0.557, P less than 0.025 and r = 0.644, P less than 0.005, respectively). This data suggests that: PLA2 activity may, in part, account for the higher generation of LTB4 by RA PMNL; NSAIAs may be capable of modulating this abnormality; and Clotrimazole may affect the clinical or laboratory data of RA patients already on treatment with NSAIA.
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