Abstract
To study the inflammatory properties of lysophosphatidylserine (a phospholipid acting as a histamine releaser), rats were subjected to local treatment with this compound. In the paw a rapid and dose-dependent edematous reaction occurred within 30–60 min (ED50 2.5 μg/rat). The effect was dependent on the intact configuration of serine head group since lysophosphatidylcholine, lysophosphatidylethanolamine, lysophosphatidic acid andN-acetimidyl-lysophosphatidylserine were uneffective. Indomethacin produced a weak inhibition but chlorpheniramine and cyproheptadine inhibited 50 and 70%, respectively. Consistently, the histamine stores of the paw were found to be decreased at the end of the lysophosphatidylserine effect. Increase in vascular permeability was observed also after the injection of lysophosphatidylserine into the dorsal skin and pleural cavity although the phospholipid was less effective in these regions. The fluid extravasation in the pleural cavity was 75% prevented by cyproheptadine. Parallelin vitro experiments showed that the effect of lysophosphatidylserine on isolated pleural and peritoneal mast cells is increased when a leukocyte lysate was also added. After centrifugation the activity was retained in the insoluble fraction. It is concluded that lysophosphatidylserine, injected locally, elicits an inflammatory reaction mediated by the components of mast cell granulus. The response may be amplified by the migration of other inflammatory cells into the exudate.
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Mietto, L., Boarato, E., Toffano, G. et al. Local effects of lysophosphatidylserine in rats. Agents and Actions 14, 606–612 (1984). https://doi.org/10.1007/BF01978894
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DOI: https://doi.org/10.1007/BF01978894