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Substance P and antinociception.

M E Hall, J M Stewart

    Peptides
    |January 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Substance P (SP) administration in mice produced pain relief, but the effect varied with dosage, pH, and housing conditions. This explains why previous studies yielded conflicting results on SP

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    Area of Science:

    • Neuroscience
    • Pharmacology

    Background:

    • Substance P (SP) is a neuropeptide implicated in pain transmission.
    • Previous research on SP-induced antinociception has yielded controversial and inconsistent findings, particularly after intraperitoneal administration.

    Purpose of the Study:

    • To investigate the conditions influencing Substance P (SP)-induced antinociception in male mice.
    • To clarify the discrepancies in previous findings regarding SP's effect on pain perception.

    Main Methods:

    • Intraperitoneal administration of SP in male mice.
    • Hot plate test to assess antinociception.
    • Evaluation of dose-response curves, vehicle pH, and housing conditions (individual vs. collective).
    • Assessment of the duration of the antinociceptive effect and its reversal by naloxone.

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    Main Results:

    • SP induced significant hot plate antinociception in male mice following intraperitoneal administration.
    • A bell-shaped dose-response curve was observed for SP's antinociceptive effect.
    • The antinociceptive effect was dependent on the pH of the vehicle and was reversible by naloxone.
    • Antinociception was abolished when subjects were housed collectively compared to individually.

    Conclusions:

    • SP-induced antinociception is influenced by factors including dose, vehicle pH, and experimental housing conditions.
    • The observed bell-shaped dose-response curve and environmental factors contribute to the variability in SP's effects on nociception.
    • Understanding these variables is crucial for interpreting and replicating studies on SP and pain.