Thromb Haemost 1995; 74(03): 949-953
DOI: 10.1055/s-0038-1649853
Original Article
Platelets
Schattauer GmbH Stuttgart

Inherited Platelet δ-Storage Pool Disease in Dogs Causing Severe Bleeding: An Animal Model for a Specific ADP Deficiency

Mary Beth Callan
The Departments of Clinical Studies and Pathoblology, University of Pennsylvania School of Veterinary Medicine, Philadelphia; and Departments of Medicine and Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, USA
,
Joel S Bennett
The Departments of Clinical Studies and Pathoblology, University of Pennsylvania School of Veterinary Medicine, Philadelphia; and Departments of Medicine and Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, USA
,
Deborah K Phillips
The Departments of Clinical Studies and Pathoblology, University of Pennsylvania School of Veterinary Medicine, Philadelphia; and Departments of Medicine and Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, USA
,
Mark E Haskins
The Departments of Clinical Studies and Pathoblology, University of Pennsylvania School of Veterinary Medicine, Philadelphia; and Departments of Medicine and Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, USA
,
James E Hayden
The Departments of Clinical Studies and Pathoblology, University of Pennsylvania School of Veterinary Medicine, Philadelphia; and Departments of Medicine and Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, USA
,
Jamie G Anderson
The Departments of Clinical Studies and Pathoblology, University of Pennsylvania School of Veterinary Medicine, Philadelphia; and Departments of Medicine and Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, USA
,
Urs Giger
The Departments of Clinical Studies and Pathoblology, University of Pennsylvania School of Veterinary Medicine, Philadelphia; and Departments of Medicine and Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, USA
› Author Affiliations
Further Information

Publication History

Received 08 November 1994

Accepted after resubmission 20 April 1995

Publication Date:
09 July 2018 (online)

Summary

The nature of a disorder producing moderate to severe bleeding after minor trauma, venipuncture, and surgery was studied in 3 families of American cocker spaniel dogs. In the 5 affected dogs tested, platelet counts and measurements of plasma coagulant function and von Willcbrand factor were normal. However, bleeding times were prolonged in 4 of the 5 affected dogs tested, and platelet aggregation in response to ADP and collagen was consistently abnormal in 3, suggesting that the bleeding disorder was due to abnormal platelet function. Measurements of 14C-serotonin uptake and retention by the affected platelets were normal. However, their ADP content was decreased, while their ATP content was normal, resulting in a mean ATP/ADP ratio of 8.32, compared to a mean ratio of 1.9 in normal canine platelets. Electron microscopy revealed that the number and appearance of the dense granules in the affected platelets were indistinguishable from those of normal controls. These studies suggest that this bleeding disorder results from a deficient δ-granule storage pool of ADP; given the normal serotonin uptake and retention by affected platelets and the apparently normal number of dense granules, the ADP deficiency may be the consequence of a selective defect in δ-granule ADP transport. Additional studies of this unique platelet disorder will provide an opportunity to understand the mechanism of adenine nucleotide storage in platelet δ granules.