Effect on ex vivo platelet aggregation and in vivo cyclic flow with Na+/H+ exchange inhibition: Gumina, NHE-1 inhibition and platelet aggregation. J Thromb Thrombolysis 2011 May;31(4):431-5
Date
11/18/2010Pubmed ID
21082215Pubmed Central ID
PMC3096849DOI
10.1007/s11239-010-0530-0Scopus ID
2-s2.0-80052320133 (requires institutional sign-in at Scopus site) 2 CitationsAbstract
BIIB 513 and EMD 85131 are selective inhibitors of the Na+/H+ exchanger-1 (NHE-1) that are benzoylguanidine derivatives of the clinically employed diuretic amiloride. Prior studies have suggested a role for NHE-1 activity in platelet activation and aggregation using amiloride or its non- benzoylguanidines derivatives. However, the concentrations employed in these prior studies were at levels known to exert effects on other ion transport systems besides the NHE-1. Therefore, the purpose of this study was to examine the effects of more selective NHE-1 inhibitors, BIIB 513 and EMD 85131, on platelet aggregation and in vivo cyclic flow following arterial injury. BIIB 513 and EMD 85131 effects on ex vivo canine and human platelet aggregation in response to various agents was monitored via platelet aggregation. For analysis of in vivo thrombus formation, a femoral artery crush injury model was employed and a flow meter was used to monitor the effect of BIIB 513 on cyclic blood flow. Treatment of either canine or human platelets with up to 1 mM of BIIB 513 had no effect on aggregation induced by platelet activating factor (PAF), thrombin receptor activator peptide (TRAP), or adenosine diphosphate (ADP). Additionally, the structurally related compound EMD 85131 at up to 1 mM failed to inhibit TRAP induced platelet aggregation. In vivo administration of up to 9 mg/kg of BIIB 513 intravenously failed to affect cyclic flow in a canine model of femoral artery injury. These data demonstrate that the specific and selective NHE-1 inhibitors BIIB 513 or EMD 85131 have no effect on ex vivo platelet aggregation or in vivo cyclic flow following arterial injury.
Author List
Gumina RJ, Newman PJ, Gross GJMESH terms used to index this publication - Major topics in bold
AnimalsBenzamides
Blood Flow Velocity
Blood Platelets
Disease Models, Animal
Dogs
Femoral Artery
Humans
Mesylates
Platelet Aggregation
Pyrroles
Sodium-Hydrogen Exchangers
