Strenuous, acute exercise suppresses polymorphonuclear leukocyte respiratory burst under adherence to surface-adherent platelets in men

Jong-Shyan Wang

doi:10.1160/TH04-04-0226

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2004; 92(05): 1076-1085
DOI: 10.1160/TH04-04-0226

Wound Healing and Inflammation/Infection

Schattauer GmbH

Strenuous, acute exercise suppresses polymorphonuclear leukocyte respiratory burst under adherence to surface-adherent platelets in men

Jong-Shyan Wang

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

› Author Affiliations

Abstract

Summary

Interaction between polymorphonuclear leukocyte (PMN) and platelets is important in the pathogenesis of thrombosis and inflammation. This study investigates how strenuous, acute exercise affects PMN oxidative burst activity under adherence to surface-adherent platelets. Thirty sedentary healthy men exercised strenuously (up to maximal oxygen consumption) on a bicycle ergometer. Before and immediately after exercise, the kinetics of oxidant production, phosphorylation of various protein kinase C (PKC) isoforms, and translocation of p47phox in PMNs under adherence to surface-adherent platelets were measured using fluorescence microscopy combined with computerized image analysis. Analytical results can be summarized as follows: (i) either treating the platelet with P-selectin (CD62P) and glycoprotein IIb/IIIa (CD41) antibodies or treating the PMN with β2-integrin (CD18) and Mac-1 (CD11b) antibodies and PKCζpseudosubstrate effectively inhibits platelet-promoted oxidant production of PMN; (ii) PMNs adhesion to surface-adherent platelets is associated with a higher amount of phospho-PKCζand a larger ratio of membrane to cytosolic p47phox than suspended PMNs; (iii) strenuous, acute exercise decreases platelet-promoted oxidant production of PMN and is accompanied by suppressed phosphorylation of PKCζ, translocation of p47phox, and inhibition of PKCζpseudosubstrate to oxidant production; (iv) no significant changes occur in PKCα/βII and δ phosphorylation of adherent PMNs following this exercise. Therefore, we conclude that strenuous, acute exercise suppresses platelet-promoted oxidative burst of PMN, possibly by reducing phosphorylation of PKCζand translocation of the cytosolic p47phox to the plasma membrane, thus inhibiting the assembly and activation of NADPH oxidase in PMN.

Keywords

Exercise - respiratory burst - PKCζ - p47phox

Full Text

References

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