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Related Experiment Videos

Methionine-enkephalin and morphine: amount ejected microiontophoretically

D A Hosford, H J Haigler, R S Turner

    Journal of Neuroscience Methods
    |August 1, 1981
    PubMed
    Summary

    Microiontophoretic transport numbers for Met-enkephalin and morphine differ based on pipette type. Caution is advised when comparing microiontophoresis data across studies.

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    Area of Science:

    • Neuropharmacology
    • Analytical Chemistry

    Background:

    • Microiontophoresis is a technique used to deliver drugs to specific neurons.
    • Understanding drug transport numbers is crucial for accurate interpretation of microiontophoresis experiments.

    Purpose of the Study:

    • To determine and compare the microiontophoretic transport numbers of Met-enkephalin and morphine.
    • To assess the influence of pipette configuration (5-barrel vs. 7-barrel) on transport numbers.
    • To evaluate the implications of these findings for comparing data across different microiontophoresis studies.

    Main Methods:

    • Microiontophoresis was employed to eject tritiated Met-enkephalin and morphine.
    • Transport numbers were measured using varying ejection currents and durations from both 5- and 7-barrel micro-pipettes.
    • Experiments were conducted in a small volume of 0.9% NaCl.

    Main Results:

    • Met-enkephalin exhibited 2-4 times lower transport numbers than morphine.
    • Transport numbers were significantly higher when using 5-barrel pipettes compared to 7-barrel pipettes for both compounds.
    • The data highlights variability in drug delivery based on experimental setup.

    Conclusions:

    • Microiontophoretic transport numbers for Met-enkephalin and morphine are influenced by pipette design.
    • Researchers must exercise caution when comparing data from studies employing different microiontophoresis setups.
    • These transport numbers are essential for accurately comparing the neuronal effects of morphine and Met-enkephalin.

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