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beta-Endorphin and adrenocortical function in obesity.

P M Zelissen1, H P Koppeschaar, D W Erkelens

  • 1Department of Endocrinology, University Hospital, Utrecht, The Netherlands.

Clinical Endocrinology
|October 1, 1991
PubMed
Summary
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Obese individuals exhibit higher beta-endorphin levels, but this hyperendorphinaemia is influenced by the hypothalamic-pituitary-adrenocortical axis, not originating outside the pituitary. Weight loss did not alter these findings.

Area of Science:

  • Endocrinology
  • Neuroscience
  • Obesity Research

Background:

  • Obesity is often associated with altered levels of beta-endorphin, a key neuropeptide.
  • The origin of hyperendorphinaemia in obesity, particularly whether it stems from the pituitary or elsewhere, remains unclear.

Purpose of the Study:

  • To investigate the hypothesis that elevated beta-endorphin levels in obese individuals originate outside the pituitary gland.
  • To examine the influence of the hypothalamic-pituitary-adrenocortical (HPA) axis on beta-endorphin levels in obesity.

Main Methods:

  • The study involved obese females and normal-weight controls, with obese subjects also studied after weight reduction.
  • Participants underwent dexamethasone suppression followed by corticotrophin-releasing hormone (CRH) administration.

Related Experiment Videos

  • Plasma levels of beta-endorphin, ACTH, and cortisol were measured, along with 24-hour urinary cortisol production rate.

    • Main Results:

    • Obese subjects had significantly higher basal plasma beta-endorphin levels compared to controls.
    • Dexamethasone suppression affected beta-endorphin similarly in both groups.
    • CRH administration elicited a comparable increase in beta-endorphin in obese and control subjects, indicating pituitary involvement.
    • Cortisol production rate was higher in obese individuals, but weight loss did not alter these parameters or hormonal responses.

    Conclusions:

    • The findings suggest that hyperendorphinaemia in obesity is influenced by the HPA axis and pituitary function.
    • The hypothesis that elevated beta-endorphin in obesity originates extrapituitary is not supported by this study.
    • Obesity is linked to altered HPA axis activity, impacting beta-endorphin regulation within the pituitary.