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Human platelets possess multiple [3H]imipramine binding sites.

J R Ieni, S R Zukin, H M Van Praag

    European Journal of Pharmacology
    |November 27, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    Human platelet [3H]imipramine binding exhibits complex, two-site characteristics. This finding explains variable Bmax values and aids research into affective disorders.

    Area of Science:

    • Pharmacology
    • Neuroscience
    • Biochemistry

    Background:

    • [3H]imipramine binding to human platelets is a key area of research.
    • Previous studies reported inconsistent Bmax values, suggesting a need for further investigation.

    Purpose of the Study:

    • To analyze the binding kinetics of [3H]imipramine in human platelets.
    • To identify the number and affinity of binding sites.
    • To provide a basis for understanding discrepancies in reported Bmax values.

    Main Methods:

    • Scatchard analysis of [3H]imipramine binding over a concentration range of 0.1-250 nM.
    • Computer-assisted analysis to fit binding data to various models.

    Main Results:

    • Binding data revealed a biphasic, concave upward curve, indicating complex binding.

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  • A two-site model provided the best fit, with distinct high- and low-affinity components.
  • Apparent Kd values were 0.68 nM (high affinity) and 293 nM (low affinity).
  • Apparent Bmax values were 802 fmol/mg protein (high affinity) and 12.72 pmol/mg protein (low affinity).

    • Conclusions:

    • [3H]imipramine binding to human platelets is complex, involving at least two affinity sites.
    • The identified high- and low-affinity sites explain the variability in Bmax values found in literature.
    • Further research into these sites may clarify the role of [3H]imipramine binding in affective disorders.