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Corticotropin-releasing factor testing reveals a dose-dependent difference in methadone maintained vs control
James H Schluger1, Gavin Bart, Mark Green
1Laboratory of the Biology of Addictive Diseases, The Rockefeller University, 1230 York Avenue, New York, NY 10021-6399, USA.
Summary
Heroin addiction disrupts the stress response system (hypothalamic-pituitary-adrenal axis). Even with methadone treatment, some abnormalities in this axis may persist, indicating long-term neuroendocrine changes.
Area of Science:
- Neuroendocrinology
- Addiction research
- Stress response
Background:
- Opiate addiction is linked to abnormal function of the stress-responsive hypothalamic-pituitary-adrenal (HPA) axis.
- Previous studies suggest HPA axis responsivity normalizes with methadone maintenance treatment.
Purpose of the Study:
- To investigate HPA axis function in heroin addicts undergoing stable methadone maintenance.
- To examine hormonal responses to human corticotropin-releasing factor (hCRF) in former heroin addicts compared to controls.
Main Methods:
- 16 normal male volunteers (NV) and 8 male methadone-maintained (MM) former heroin addicts participated.
- Intravenous administration of saline placebo and two doses of hCRF (0.5 and 2.0 microg/kg).
- Serial measurement of plasma adrenocorticotrophic hormone (ACTH) and cortisol levels.
Main Results:
- No significant hormonal differences between groups after placebo.
- Both NV and MM showed a dose-response to hCRF.
- MM exhibited a significantly greater ACTH increase than NV after high-dose hCRF, but not low-dose.
Conclusions:
- Despite methadone treatment, some HPA axis abnormalities may persist in former heroin addicts.
- These persistent abnormalities could be a consequence of heroin exposure or pre-existing conditions.
- This suggests long-term neuroendocrine alterations associated with addiction and its treatment.