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Related Experiment Videos

[Glutamate-binding membrane proteins from human platelets].

V S Gurevich, Iu G Popov, A I Gorodinskiĭ

    Biokhimiia (Moscow, Russia)
    |September 1, 1991
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers isolated human platelet proteins with glutamate-binding activity, finding similarities to brain glutamate-binding proteins. This suggests potential roles for these platelet proteins in neurotransmission-related pathways.

    Area of Science:

    • Biochemistry
    • Neuroscience
    • Molecular Biology

    Context:

    • Platelets, traditionally known for hemostasis, are increasingly recognized for roles beyond blood clotting.
    • Glutamate is a major excitatory neurotransmitter in the central nervous system, with its receptors and binding proteins being crucial for synaptic function.
    • Understanding glutamate-binding proteins in non-neuronal cells like platelets can reveal novel physiological functions and potential therapeutic targets.

    Purpose:

    • To isolate and characterize proteins from human platelets that exhibit glutamate-binding activity.
    • To compare the biochemical and immunochemical properties of these platelet proteins with known glutamate-binding proteins in the mammalian brain.

    Summary:

    • Human platelet total membrane fraction was solubilized and subjected to affinity chromatography on glutamate agarose, yielding two fractions with glutamate-binding activity.

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  • Radioligand binding assays revealed distinct binding site characteristics in the two fractions: Fraction 1 showed two types (Kd1 = 1 µM, Bmax1 = 100 pmol/mg; Kd2 = 9.3 µM, Bmax2 = 395 pmol/mg), while Fraction 2 exhibited one type (Kd = 1 µM, Bmax = 110 pmol/mg).
  • SDS-PAGE identified protein components in Fraction 1 (14, 24, 56, 155 kDa) and Fraction 2 (14, 46, 71, 155 kDa). Immunoenzymatic analysis confirmed significant immunochemical similarity between these platelet proteins and human brain synaptic membrane glutamate-binding proteins.

    • Impact:

    • This study identifies novel glutamate-binding proteins in human platelets, suggesting a potential role for platelets in modulating glutamatergic signaling.
    • The findings open avenues for investigating platelet function in neurological conditions where glutamate signaling is dysregulated.
    • The identified platelet glutamate-binding proteins could serve as potential biomarkers or therapeutic targets for diseases involving glutamate pathways.