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Disturbed endocrine function in the psychoses. I: Disordered homeostasis or disease process?
L J Whalley1, J E Christie, D H Blackwood
1University Department of Psychiatry, Royal Edinburgh Hospital, Morningside Park.
Summary
Schizoaffective mania patients show distinct hormonal changes, including higher cortisol and lower nighttime TSH, differing from other psychoses and controls. These findings challenge stress-response and continuum models of mental illness.
Area of Science:
- Neuroendocrinology
- Psychiatry
- Hormonal Regulation
Background:
- Hormonal dysregulation is implicated in various psychiatric disorders.
- Previous research suggests alterations in prolactin, growth hormone, cortisol, and thyroid-stimulating hormone (TSH) in psychosis.
- The specific hormonal profiles differentiating subtypes of psychosis remain incompletely understood.
Purpose of the Study:
- To investigate plasma hormone concentrations in newly admitted psychiatric patients compared to controls.
- To identify hormonal differences associated with specific psychotic disorders, particularly schizoaffective mania (SAM).
- To explore the diagnostic specificity of observed hormonal changes in psychosis.
Main Methods:
- Measured plasma levels of prolactin, growth hormone, cortisol, TSH, and neurophysins over 17 hours.
- Studied 98 newly admitted psychiatric patients (70 medication-free for 3 months) and 35 control subjects.
- Compared hormonal profiles across diagnostic groups: SAM, schizophrenia, manic disorder, other psychoses, and controls.
Main Results:
- Patients with SAM exhibited significantly higher plasma cortisol and lower night-time TSH concentrations compared to controls.
- Night-time TSH levels were also significantly lower in SAM patients than in schizophrenic or manic disorder patients.
- Elevated prolactin levels were most pronounced in affective psychoses, while cortisol increases were less marked in other psychotic subgroups; limited diagnostic specificity was observed beyond SAM.
Conclusions:
- Hormonal alterations in SAM, specifically increased cortisol and decreased night-time TSH, are distinct and not merely a non-specific stress response.
- The findings suggest specific neuroendocrine pathways may be involved, potentially including serotonergic pathways influencing cortisol and prolactin.
- The observed hormonal patterns do not support a single continuum of biological disturbance underlying all psychoses.