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Related Experiment Videos

Canine limbic system substance P receptors.

D M Desiderio, H Onishi

    Journal of Receptor Research
    |January 1, 1986
    PubMed
    Summary

    Researchers used canine limbic system preparations to identify substance P receptor activity in biological samples. This method allows for the quantification of receptor-active substance P in extracts like human tooth pulp.

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    Area of Science:

    • Neuroscience
    • Biochemistry
    • Pharmacology

    Background:

    • Substance P is a neuropeptide involved in pain and inflammation.
    • Substance P receptors are crucial targets for therapeutic interventions.
    • Quantifying receptor-active substance P in biological tissues is essential for understanding its role.

    Purpose of the Study:

    • To establish a canine limbic system preparation as a reliable source for substance P receptors.
    • To develop a method for screening high-performance liquid chromatography (HPLC) fractions for receptor-active substance P.
    • To quantify endogenous receptor-active substance P in biological extracts, specifically human tooth pulp.

    Main Methods:

    • Utilized a canine limbic system preparation for substance P receptor isolation.
    • Employed gradient RP-HPLC to separate and screen fractions for biological activity.
    • Assessed receptor binding characteristics, including dissociation constant (KD) and maximum binding capacity (Bmax).

    Main Results:

    • The canine limbic system preparation yielded substance P receptors with specific binding characteristics.
    • Receptor-active substance P was successfully detected and quantified in biological extracts.
    • Binding characteristics (KD = 1.3 nM, Bmax = 11 fmol mg-1 protein) were comparable to those from other sources like rat brain.

    Conclusions:

    • Canine limbic system provides a viable source for substance P receptors.
    • The developed RP-HPLC screening method is effective for identifying receptor-active substance P.
    • This approach facilitates the quantification of endogenous substance P, relevant for conditions like dental pain.

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