Targeted disruption of cd73/ecto-5'-nucleotidase alters thromboregulation and augments vascular inflammatory response

Circulation Research
Patrycja KoszalkaJürgen Schrader

Abstract

To investigate the role of adenosine formed extracellularly in vascular homeostasis, mice with a targeted deletion of the cd73/ecto-5'-nucleotidase were generated. Southern blot, RT-PCR, and Western blot analysis confirmed the constitutive knockout. In vivo analysis of hemodynamic parameters revealed no significant differences in systolic blood pressure, ejection fraction, or cardiac output between strains. However, basal coronary flow measured in the isolated perfused heart was significantly lower (-14%; P<0.05) in the mutant. Immunohistochemistry revealed strong CD73 expression on the endothelium of conduit vessels in wild-type (WT) mice. Time to carotid artery occlusion after ferric chloride (FeCl3) was significantly reduced by 20% in cd73-/- mice (P<0.05). Bleeding time after tail tip resection tended to be shorter in cd73-/- mice (-35%). In vivo platelet cAMP levels were 0.96+/-0.46 in WT versus 0.68+/-0.27 pmol/106 cells in cd73-/- mice (P<0.05). Under in vitro conditions, platelet aggregation in response to ADP (0.05 to 10 micromol/L) was undistinguishable between the two strains. In the cremaster model of ischemia-reperfusion, the increase in leukocyte attachment to endothelium was significantly higher in cd73-/- compar...Continue Reading

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