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Related Experiment Videos

Characterization of platelet function in cyclic hematopoietic dogs.

C D Lothrop1, R V Candler, H L Pratt

  • 1University of Tennessee Department of Environmental Practice, College of Veterinary Medicine 37901-1071.

Experimental Hematology
|October 11, 1991
PubMed
Summary

Platelets in cyclic hematopoietic (CH) dogs show defective aggregation with certain agonists, indicating a storage pool disease. This defect involves decreased phosphorylation of a 40-kd protein, impacting platelet function.

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Area of Science:

  • Hematology
  • Biochemistry
  • Canine Medicine

Background:

  • Cyclic hematopoiesis (CH) is a disorder affecting blood cell production.
  • Platelet function is crucial for hemostasis and thrombosis.
  • Understanding platelet defects in CH dogs can provide insights into human platelet disorders.

Purpose of the Study:

  • To compare platelet aggregation in normal and CH dogs using various agonists.
  • To investigate biochemical differences in platelets from CH dogs.
  • To identify the underlying defect in CH platelet dysfunction.

Main Methods:

  • Platelet aggregation assays with eight different agonists.
  • Radioimmunoassay (RIA) for Thromboxane B2 (TXB2) measurement.
  • Analysis of serotonin and adenine nucleotide storage pools.

Related Experiment Videos

  • Western blot analysis of protein phosphorylation.

    • Main Results:

    • CH platelets exhibited defective aggregation with collagen, platelet-activating factor (PAF), and 12-O-tetradecanoyl phorbol-13-acetate (TPA).
    • Aggregation was normal with ADP, phospholipase C (PLC), arachidonic acid plus epinephrine, and A23187.
    • Homozygous CH dogs had decreased serotonin and adenine nucleotide storage pools.
    • Collagen-stimulated phosphorylation of a 40-kd protein was reduced in CH platelets.

    Conclusions:

    • CH dogs possess a biochemical defect in platelets leading to storage pool disease.
    • This defect is associated with impaired phosphorylation of a 40-kd protein upon collagen stimulation.
    • Findings suggest a specific molecular abnormality contributing to platelet dysfunction in CH.