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Dynorphin immunoreactivity in pituitary.

B M Cox, E R Baer, A Goldstein

    Advances in Biochemical Psychopharmacology
    |January 1, 1982
    PubMed
    Summary
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    Immunoreactive dynorphin exists in three forms across rat tissues. NaCl exposure depleted dynorphin and vasopressin in the neurointermediate lobe, suggesting a regulatory role.

    Area of Science:

    • Neuroendocrinology
    • Molecular Neuroscience

    Background:

    • Immunoreactive dynorphin (ir-dynorphin) is found in multiple tissue types.
    • Previous studies indicate ir-dynorphin exists in various molecular forms.

    Purpose of the Study:

    • To characterize the molecular forms of ir-dynorphin in rat pituitary and brain.
    • To investigate the relationship between ir-dynorphin and ir-[Arg]-vasopressin (ir-AVP) in response to physiological stimuli.

    Main Methods:

    • Gel filtration chromatography was used to separate ir-dynorphin components.
    • Tissue extracts from rat pituitary and brain were analyzed.
    • Rats were exposed to NaCl to assess neurohormone store depletion.

    Main Results:

    • Three distinct ir-dynorphin components were identified, present in both pituitary and brain tissues.

    Related Experiment Videos

  • The anterior pituitary predominantly contained the highest molecular weight component.
  • The neurointermediate lobe showed a different distribution, with the smallest molecular weight component being the major form.
  • NaCl administration led to a parallel decrease in ir-dynorphin and ir-AVP levels in the neurointermediate lobe.

    • Conclusions:

    • Rat pituitary and brain possess similar, yet differentially distributed, molecular forms of ir-dynorphin.
    • Dynorphin may play a role in regulating vasopressin release, potentially acting in concert with vasopressin itself.