DENGUE FEVER ACTIVATES THE l-ARGININE-NITRIC OXIDE PATHWAY: AN EXPLANATION FOR REDUCED AGGREGATION OF HUMAN PLATELETS
| Autor: | Mariana Alves de Sá Siqueira, J. Clive Ellory, Giovanni E. Mann, Monique B. Moss, Thalyta L. Moraes, Tatiana M.C. Brunini, Antonio C. Mendes-Ribeiro |
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| Rok vydání: | 2008 |
| Předmět: |
Adult
Male Platelet Aggregation Arginine Platelet aggregation Physiology Biological Transport Active Down-Regulation Nitric Oxide Nitric oxide Dengue fever Dengue chemistry.chemical_compound Fibrinogen levels Physiology (medical) Humans Medicine Platelet Pathological Pharmacology Platelet Count business.industry medicine.disease Up-Regulation chemistry Immunology Nitric Oxide Pathway Female Blood Platelet Disorders business Signal Transduction |
| Zdroj: | Clinical and Experimental Pharmacology and Physiology. 35:1143-1146 |
| ISSN: | 1440-1681 0305-1870 |
| DOI: | 10.1111/j.1440-1681.2008.04970.x |
| Popis: | In patients with Dengue fever, a viral inflammatory syndrome, haemorrhage is a significant pathological feature, yet the underlying mechanisms remain unclear. Nitric oxide (NO) is an important regulator of platelet function, inhibiting aggregation, recruitment and adhesion to the vascular endothelium. We have investigated whether changes in the activity of the L-arginine-NO pathway in human platelets may account for increased bleeding in patients with Dengue fever. A total of 16 patients with Dengue fever and 18 age-matched healthy volunteers participated in the study. Collagen induced platelet aggregation in a dose-dependent manner in both Dengue patients and controls, but the degree of platelet aggregation was significantly reduced in the patient group. Elevated rates of L-arginine transport in Dengue fever patients were associated with enhanced NO synthase activity and elevated plasma fibrinogen levels. The present study provides the first evidence that Dengue fever is associated with increased L-arginine transport and NO generation and reduced platelet aggregation. |
| Databáze: | OpenAIRE |
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