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Microvesicle Generation by Lipid Mediator in Erythrocytes  

Chung, Seung-Min (Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University)
Bae, Ok-Nam (Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University)
Noh, Ji-Yoon (Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University)
Kim, Su-Jin (Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University)
Lim, Kyung-Min (Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University)
Chung, Jin-Ho (Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University)
Publication Information
Toxicological Research / v.22, no.4, 2006 , pp. 397-402 More about this Journal
Abstract
Lipid mediator such as lysophosphatidic acid (LPA) plays an important role in inflammation and wound heating, has been recently reported to induce influx of extracellular calcium into erythrocytes. This elevation in intracellular calcium level may cause destruction of membrane asymmetry and procoagulant microvesicle formation. Thus, we investigated if the lipid mediator could induce microvesicle formation as a result of extracellular calcium influx in human erythrocytes. Treatment with lipid mediator to erythrocytes resulted in microvesicle generation In a concentration-, time-dependent manner. Microvesicles formed expressed procoagulant phosphatidylserine (PS) on their surface membrane significantly as well. LPA did not affect the band 3 phosphorylation which is involved in morphological change in erythrocytes. Pretreatment with suramin did not inhibit LPA-induced microvesicle generation, suggesting microvesicle generation was not receptor-dependent pathway. Depletion of intracellular ATP levels in erythrocytes was suggested to be one of the mechanism for these events.
Keywords
Erythrocyes; Lysophosphatidic acid; Phosphatidylserine; Microvesicle;
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