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Leptin induces the generation of procoagulant, tissue factor bearing microparticles by human peripheral blood mononuclear cells.
- Source :
-
Biochimica et biophysica acta [Biochim Biophys Acta] 2016 Jun; Vol. 1860 (6), pp. 1354-61. Date of Electronic Publication: 2016 Mar 23. - Publication Year :
- 2016
-
Abstract
- Background: Obesity is linked to increased thrombotic risk. Circulating leptin concentration correlates with body mass index. Microparticles are small (.05-1 μm) vesicles shed by activated and apoptotic cells, involved in numerous pathophysiologically relevant phenomena including blood coagulation and thrombosis. We tested the hypothesis that leptin induces the shedding of procoagulant, tissue factor bearing microparticles by human peripheral blood mononuclear cells, and investigated the intracellular mechanisms leading to microparticle release upon incubation with leptin.<br />Methods: Peripheral blood mononuclear cells were isolated from healthy donors. Cells were incubated with leptin in the presence or in the absence of a phospholipase C inhibitor, U73122, a calmodulin inhibitor, W-7, and three inhibitors of mitogen activated protein kinases. Microparticle generation was assessed as phosphatidylserine concentration with a prothrombinase assay and by cytofluorimetric analysis. Tissue factor expression on microparticles was measured with a one-stage clotting assay. Intracellular calcium concentration was assessed by a fluorescent probe.<br />Results: Leptin increased intracellular calcium mobilization and stimulated the generation of tissue factor-bearing MP by peripheral blood mononuclear cells, as assessed by phosphatidylserine quantification, clotting tests and flow-cytometry. U73122, PD98059 (an extracellular signal-regulated kinase1/2 inhibitor), and W-7, significantly inhibited leptin-induced MP release. SB203580 (a p38 inhibitor), and SP600125 (a c-Jun N-terminal kinase inhibitor) had no effect.<br />Conclusion: Leptin-induced generation of procoagulant microparticles might represent a link between obesity and atherothrombotic risk. Inhibition of leptin-induced microparticle generation might prove a viable strategy for the reduction of such risk in obese individuals.<br /> (Copyright © 2016 Elsevier B.V. All rights reserved.)
- Subjects :
- Calcium metabolism
Calmodulin physiology
Cell-Derived Microparticles physiology
Cells, Cultured
Extracellular Signal-Regulated MAP Kinases metabolism
Humans
Type C Phospholipases physiology
Blood Coagulation Factors biosynthesis
Cell-Derived Microparticles drug effects
Leptin pharmacology
Leukocytes, Mononuclear metabolism
Thromboplastin biosynthesis
Subjects
Details
- Language :
- English
- ISSN :
- 0006-3002
- Volume :
- 1860
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Biochimica et biophysica acta
- Publication Type :
- Academic Journal
- Accession number :
- 27015759
- Full Text :
- https://doi.org/10.1016/j.bbagen.2016.03.029