Moderate-intensity exercise suppresses platelet activation and polymorphonuclear leukocyte interaction with surface-adherent platelets under shear flow in men

Jong-Shyan Wang; Chang-Hui Liao

doi:10.1160/TH03-10-0644

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2004; 91(03): 587-594
DOI: 10.1160/TH03-10-0644

Wound Healing and Inflammation/Infection

Schattauer GmbH

Moderate-intensity exercise suppresses platelet activation and polymorphonuclear leukocyte interaction with surface-adherent platelets under shear flow in men

Jong-Shyan Wang

¹Graduate Institute of Rehabilitation Science and Center for Gerontological Research, Chang Gung University, Taoyuan, Taiwan

,

Chang-Hui Liao

²Graduate Institute of Natural Products, Chang Gung University, Taoyuan, Taiwan

› Author Affiliations

Abstract

Summary

The reciprocal modulation of platelet and polymorphonuclear leukocyte (PMN) activities is important in the pathogenesis of thrombosis and inflammation. This study investigated how moderate exercise affects shear-induced platelet activation and subsequent PMNs interaction with platelet-related thrombi under shear flow. Sixteen sedentary healthy men engaged in moderate exercise (about 60% V·O_2max) on a bicycle ergometer. Platelet activation, PMNs interaction with surface-adherent platelets, and PMN-dependent inhibition of platelet activation under shear flow were measured both before and immediately after exercise. The results of this study can be summarized as follows: (1) moderate exercise was associated with lower extents of shear-induced platelet adhesion and aggregation, binding of von Willbrand factor (vWF) to platelets, and glycoprotein IIb/IIIa activation and P-selectin expression on platelet than at rest; (2) the velocity and percentage of rolling PMNs increased while the number of PMNs remaining bound to surface-adherent platelets decreased after moderate exercise; (3) although treating the PMNs with oxidized-low density lipoprotein (Ox-LDL) enhanced PMNs interaction with surface-adherent platelets, moderate exercise suppressed the enhancement of platelet-PMN interaction by Ox-LDL; (4) moderate exercise decreased platelet [Ca²⁺]_i elevation induced by ADP and platelet [Ca²⁺]_i levels mediated by PMN and Ox-LDL-treated PMN; and (5) plasma and PMN-derived nitric oxide metabolites and plasma vWF antigen and activity increased after moderate exercise, whereas plasma and platelet-derived soluble P-selectin levels remained unchanged in response to exercise. Therefore, we conclude that moderate-intensity exercise suppresses shear-induced platelet activation and subsequent PMNs adhesion to platelets deposited at sites of vascular injury under flow, thereby reducing the risks of vascular thrombosis and inflammation.

Keywords

Moderate exercise - shear stress - platelet-PMN interaction

Full Text

References

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