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Differences between intracellular platelet and brain proteins that bind serotonin

H Tamir, R Bebirian, F Muller

    Journal of Neurochemistry
    |November 1, 1980
    PubMed
    Summary

    Rat platelets contain two specific serotonin-binding proteins, a glycoprotein and albumin, distinct from brain serotonin binding protein (SBP). Platelet serotonin storage differs from brain, suggesting platelets are not a model for brain serotonin storage.

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    Area of Science:

    • Biochemistry
    • Neuroscience
    • Platelet Biology

    Background:

    • Serotonin (5-HT) is a crucial neurotransmitter involved in various physiological processes.
    • Platelets play a significant role in serotonin uptake and storage.
    • Understanding serotonin-binding proteins is key to elucidating its storage mechanisms.

    Purpose of the Study:

    • To identify and characterize serotonin-binding proteins in rat platelets.
    • To compare platelet serotonin-binding proteins with those found in the brain.

    Main Methods:

    • Purification of proteins using ammonium sulfate fractionation, Sephadex chromatography, and affinity chromatography.
    • Characterization of protein properties including molecular weight, binding constants, and heat stability.
    • Electrophoretic analysis and chemical assays.

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    Main Results:

    • Two distinct serotonin-binding proteins, a glycoprotein and albumin, were purified from rat platelets.
    • These proteins exhibited unique physical and chemical properties, differing from each other and from brain serotonin binding protein (SBP).
    • Neither protein showed characteristics of brain SBP, and SBP was not detected in platelets.

    Conclusions:

    • Rat platelets store serotonin via mechanisms distinct from those in the brain.
    • Platelet serotonin storage may not be a suitable model for understanding serotonin storage in brain nerve terminals.