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Related Experiment Videos

Fever-specific changes in central MSH and CRF concentrations.

M Holdeman, O Khorram, W K Samson

    The American Journal of Physiology
    |January 1, 1985
    PubMed
    Summary

    Melanocyte-stimulating hormone (MSH) levels increase in the rabbit brain

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    Area of Science:

    • Neuroscience
    • Endocrinology
    • Physiology

    Background:

    • Melanocyte-stimulating hormone (MSH) and corticotropin-releasing factor (CRF) exhibit antipyretic properties.
    • The roles of MSH and CRF in fever regulation within the central nervous system are not fully elucidated.

    Purpose of the Study:

    • To investigate the changes in MSH and CRF concentrations in specific brain regions during fever in rabbits.
    • To determine if these changes are specific to fever or associated with general stress or hyperthermia.

    Main Methods:

    • Utilized sensitive radioimmunoassays to measure immunoreactive MSH (IRMSH) and CRF (IRCRF) in microdissected brain tissue from rabbits.
    • Induced fever using leukocytic pyrogen and hyperthermia via heat exposure for comparison.
    • Analyzed tissue extracts from preoptic-anterior hypothalamus, midbrain central gray, septum, and paraventricular nucleus.

    Main Results:

    • Fever significantly increased IRMSH levels in the septal region.
    • Fever significantly decreased IRCRF levels in the paraventricular nucleus.
    • Neither fever nor heat exposure altered IRMSH or IRCRF concentrations in the preoptic-anterior hypothalamus or midbrain central gray.

    Conclusions:

    • Central MSH and CRF concentrations in specific brain regions are altered during fever.
    • These neuropeptide changes appear specific to the febrile state, not general hyperthermia or stress.
    • Findings support a role for these central peptides in fever-induced temperature regulation.

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