Effect of coronary thrombolysis on the plasma concentration of osteonectin (SPARC, BM40) in patients with acute myocardial infarction.

Published

Journal Article

Osteonectin is a phosphoglycoprotein exclusively located in bone and platelet alpha-granules. Human platelet-derived osteonectin is released into plasma after thrombin-induced activation. Recognizing the unique distribution of the osteonectin pool, we first sought to investigate whether osteonectin could serve as a sensitive marker of platelet activity, and identify patients with acute myocardial infarction (AMI). The second objective was to define the effects of thrombolytic therapy in these patients on the plasma concentrations of osteonectin at prespecified time points following attempted reperfusion. Osteonectin levels by ELISA were determined in AMI patients before thrombolysis and at 3, 6, 12, and 24 hours thereafter and compared with 12 healthy controls. At baseline, soluble osteonectin plasma levels were similar between controls (447. 7+/-20.6 ng/ml) and AMI patients (425.7+/-43.3 ng/mL; p=NS). A significant increase of the soluble osteonectin was observed at 3 hours after thrombolysis (519.4+/-26.9 ng/mL; p=0.03), and was followed by a decrease to baseline levels at 6 hours after attempted reperfusion. Contrary to expectations, the plasma osteonectin level in our pilot study was not a sensitive marker distinguishing patients with AMI. The early peak of soluble osteonectin at 3 hours after thrombolytic therapy is most likely not related to coronary thrombolysis per se but rather to the phasic changes of platelet activity during myocardial ischemia-reperfusion. The unquestionable platelet origin of this protein and the lack of elevated plasma levels of this alpha-granule constituent, challenge the postulate of uniform platelet activation in AMI patients.

Full Text

Duke Authors

Cited Authors

  • Serebruany, VL; Atar, D; Murugesan, SR; Jerome, S; Semaan, H; Gurbel, PA

Published Date

  • October 2000

Published In

Volume / Issue

  • 10 / 2

Start / End Page

  • 197 - 202

PubMed ID

  • 11005942

Pubmed Central ID

  • 11005942

Electronic International Standard Serial Number (EISSN)

  • 1573-742X

International Standard Serial Number (ISSN)

  • 0929-5305

Digital Object Identifier (DOI)

  • 10.1023/a:1018774812613

Language

  • eng