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Immunoreactive dynorphin in pituitary and brain.

A Goldstein, V E Ghazarossian

    Proceedings of the National Academy of Sciences of the United States of America
    |October 1, 1980
    PubMed
    Summary
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    Researchers mapped the distribution of the opioid peptide dynorphin in pig, beef, and rat tissues. Dynorphin was found widely in the central nervous system and pituitary, with distinct regional patterns compared to other opioid peptides.

    Area of Science:

    • Neuroscience
    • Endocrinology
    • Pharmacology

    Background:

    • Opioid peptides play crucial roles in pain modulation and physiological regulation.
    • Dynorphin, a potent opioid peptide, has been implicated in various central nervous system functions.
    • Understanding the distribution of dynorphin is essential for elucidating its specific roles.

    Purpose of the Study:

    • To determine the precise distribution of the opioid peptide dynorphin in the pituitary gland and central nervous system of various species.
    • To characterize the molecular forms of dynorphin present in these tissues.
    • To compare the regional distribution of dynorphin with other known opioid peptides.

    Main Methods:

    • Utilized a highly specific antiserum for the detection and quantification of dynorphin.

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  • Employed gel permeation chromatography in 4 M guanidine to analyze molecular weights of immunoreactive dynorphin.
  • Investigated dynorphin distribution in pituitary glands (pig, beef, rat) and rat brain and spinal cord regions.

    • Main Results:

    • Dynorphin immunoreactivity was detected in pituitary glands and widely distributed across rat brain and spinal cord.
    • In porcine pituitary, major dynorphin immunoreactivity was observed at ~1700 Da, with a minor peak at ~3400 Da.
    • Rat pituitary and brain extracts showed similar molecular weight peaks, with additional larger forms in the brain. Dynorphin was concentrated in the pituitary's pars nervosa and in specific brain regions like the hypothalamus and spinal cord.
    • The regional distribution of dynorphin differed significantly from that of leucine-enkephalin and other opioid peptides.

    Conclusions:

    • Dynorphin exhibits a distinct and widespread distribution within the pituitary and central nervous system.
    • The molecular forms of dynorphin vary between species and tissue types.
    • Dynorphin's unique regional localization suggests specialized functions distinct from other opioid peptides.