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Retinoids inhibit phospholipase A2 in human synovial fluid and arachidonic acid release from rat peritoneal macrophages

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Abstract

Retinoids have demonstrated antiinflammatory activity in certain animal models and human disease states. The mechanism by which retinoids elicit this activity is unknown. Some retinoids are known to inhibit arachidonic acid (AA) release and metabolism in intact cells in vitro. Retinoids may exert their antiinflammatory effects by inhibiting phospholipase A2 (PLA2) and the resultant production of inflammatory AA metabolites. Retinoids were evaluated in vitro as inhibitors of the PLA2 activity in human synovial fluid (HSF-PLA2). Of the naturally occurring, nonaromatic retinoids tested, all-trans-retinal, all-trans-retinoic acid (all-trans-RA) and 13-cis-RA were the most potent inhibitors (IC50 s 6–15ΜM), whereas all-trans-retinol was much less potent. Of the synthetic aromatic retinoids and arotinoids examined, the free carboxylic, sulfonic, and sulfinic acid forms were more than 15-fold more potent inhibitors of HSF-PLA2 than their corresponding ethyl esters. These retinoids also were evaluated as inhibitors of calcium ionophore A23187-induced AA release from rat peritoneal macrophages. All-trans-RA and 13-cis-RA were potent inhibitors of AA release from these cells (IC50 s 4ΜM), while the other natural retinoids were inactive. Of the aromatic retinoids and arotinoids tested, the free acid forms (IC50 s 2–6ΜM) were 5- to 21-fold more potent inhibitors of AA release from the macrophages than their corresponding ethyl esters. The potencies of the arotinoids as inhibitors of HSF-PLA2 appeared to correlate with their potencies as inhibitors of AA release from A23187-stimulated rat peritoneal macrophages. These data support the hypothesis that one possible mechanism for the known antiinflammatory activity of some retinoids may be by inhibition of phospholipase A2.

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Authors and Affiliations

  1. Department of Allergy and Inflammation Research, Hoffmann-La Roche Inc., 07110, Nutley, New Jersey

    William C. Hope, Bhavna J. Patel, Christa Fiedler-Nagy & Barbara H. Wittreich

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  1. William C. Hope
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  2. Bhavna J. Patel
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  3. Christa Fiedler-Nagy
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  4. Barbara H. Wittreich
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Hope, W.C., Patel, B.J., Fiedler-Nagy, C. et al. Retinoids inhibit phospholipase A2 in human synovial fluid and arachidonic acid release from rat peritoneal macrophages. Inflammation 14, 543–559 (1990). https://doi.org/10.1007/BF00914275

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