Related Experiment Videos
The adrenalin binding site on human platelets
British Journal of Haematology
|April 1, 1979
Summary
Researchers quantified human platelet receptors for epinephrine, finding approximately 105,000 binding sites per platelet. These platelet epinephrine receptors possess unique characteristics, distinct from classical alpha or beta adrenergic receptors.
Area of Science:
- Pharmacology
- Human Physiology
- Biochemistry
Background:
- Platelets play a crucial role in hemostasis and thrombosis.
- Adrenergic receptors are vital for regulating various physiological processes.
- Understanding platelet adrenergic receptors is key to cardiovascular research.
Purpose of the Study:
- To quantify and characterize epinephrine receptors on human platelets.
- To determine if human platelet epinephrine receptors align with known alpha or beta adrenergic receptor subtypes.
Main Methods:
- Utilized radiolabeled 3H-epinephrine for binding assays.
- Performed dissociation and inhibition studies with various adrenergic agents.
- Quantified epinephrine binding sites on intact human platelets.
Main Results:
- Human platelets possess approximately 105,000 epinephrine binding sites per cell.
- Epinephrine binding was inhibited by unlabeled epinephrine, norepinephrine, isoproterenol, and dopamine.
- Phentolamine and propranolol did not affect epinephrine binding, even at high concentrations.
Conclusions:
- Epinephrine binding sites are detectable and quantifiable on human platelets.
- The characteristics of these platelet epinephrine receptors differ from classical alpha and beta adrenergic receptors.
- This suggests a unique adrenergic receptor subtype may be present on human platelets.