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Melanocyte-stimulating hormone and persistent tardive dyskinesia: a hypothesis
1Department of Clinical Neuropsychiatry, New York State Psychiatric Institute, NY 10032.
The International Journal of Neuroscience
|March 1, 1990
Summary
Pinealectomized rats developed abnormal movements, potentially linked to increased Melanocyte-stimulating hormone (MSH). This suggests a connection between pineal gland function, MSH regulation, and tardive dyskinesia.
Area of Science:
- Neuroscience
- Endocrinology
Background:
- Pinealectomy in rats is associated with abnormal perioral movements.
- These movements are exacerbated by haloperidol administration.
- Elevated pituitary Melanocyte-stimulating hormone (MSH) levels are observed post-pinealectomy.
Purpose of the Study:
- To investigate the temporal relationship between perioral dyskinetic movements and pituitary MSH levels following pinealectomy.
- To explore the potential role of MSH dysregulation in the development of tardive dyskinesia (TD).
Main Methods:
- Observation of perioral movements in pinealectomized rats over several weeks.
- Measurement of pituitary MSH content at various time points post-surgery.
- Analysis of the correlation between MSH levels and movement severity.
Main Results:
- Perioral dyskinetic movements emerged within 4 days, peaking at 3 weeks post-pinealectomy.
- Pituitary MSH levels increased within 3 days and normalized within 4 weeks.
- MSH level normalization coincided with a reduction in movement severity.
Conclusions:
- Compensatory hypothalamic-pituitary mechanisms regulate MSH levels post-pinealectomy.
- Aberrant MSH regulation may contribute to tardive dyskinesia.
- Pineal gland function, potentially via melatonin, influences MSH release and may be implicated in TD pathogenesis.