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, Volume 14, Issue 1, pp 102–108 | Cite as

Theophylline inhibits platelet aggregation, prostaglandin and thromboxane production by a mechanism which is independent of cyclic AMP

  • Gillian B. Burns
  • J. A. Dodge
Platelets and Thrombosis

Abstract

Theophylline (0.05–1.0 mM) greatly enhanced the inhibition of platelet aggregation by prostaglandin E1 and at higher concentrations (1.0–4.0 mM) theophylline alone inhibited platelet aggregation, by a mechanism which did not involve significant changes in platelet cAMP levels. These concentrations of theophylline and theophylline in combination with prostaglandin E1, inhibited the synthesis of thromboxane A2, prostaglandin E2 and F2α in stimulated platelets. Theophylline also inhibited arachidonic acid-stimulated platelet aggregation suggesting an effect on cyclooxygenase activity. The calcium ionophore A23187 prevented and reversed the inhibition of platelet aggregation by theophylline, suggesting that theophylline inhibits the rise in intracellular calcium levels which occurs in response to the synthesis of prostaglandin endoperoxides and thromboxane A2.

Keywords

Calcium Prostaglandin Theophylline Platelet Aggregation Intracellular Calcium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Birkhäuser Verlag 1984

Authors and Affiliations

  • Gillian B. Burns
    • 1
  • J. A. Dodge
    • 2
  1. 1.Department of Clinical PharmacologySouthampton General HospitalSouthamptonUK
  2. 2.Department of Child HealthWelsh National School of MedicineCardiffSouth Wales, UK

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