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  • Title: Uptake of 5-hydroxytryptamine by rat blood platelets and its inhibition by adenosine 5'-diphosphate.
    Author: Drummond AH, Gordon JL.
    Journal: Br J Pharmacol; 1976 Apr; 56(4):417-21. PubMed ID: 1260221.
    Abstract:
    1 The uptake of 5-hydroxytryptamine (5-HT) by rat blood platelets in citrated plasma was linear for at most 10 s and was substantially complete within 3 minutes. 2 Adenosine 5'-diphosphate (ADP) was a potent inhibitor of 5-HT uptake (Ki=0.38 muM) and kinetic analysis revealed that the inhibition was not competitive. 3 Inhibition of 5-HT uptake by ADP was abolished in the presence of prostaglandin E1 and 2-n-amylthio-AMP, which also inhibit the stimulant actions of ADP on blood platelets. 4 It is concluded that ADP could inhibit 5-HT uptake by changing the Na+/K+ distribution across the cell membrane, and the biological significance of this is discussed.
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