Influence of cortisol on TRH-induced TSH response in depression.
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Biomedical subjects
Publications and source records attributed to I C Wilson.
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Numerous studies show that most depressed patients show abnormal pituitary responses to challenge by intravenous injection of thyrotropin releasing hormone (TRH). Some patients show after TRH diminished thyroid stimulating hormone (TSH) release, some show unexpected growth hormone release; prolactin release may be increased or decreased. The diminished TSH release is the most widely reported finding. It cannot be accounted for by primary changes in the pituitary or thyroid glands. Interference with TRH-induced TSH release by elevated cortisol may account for some observations, but this possibility has not been studied. The present data provide additional evidence that in depression there is often a disruption of hypothalamic regulatory function.
A single injection of thyrotrophin-releasing hormone (TRH) was compared to injection of nicotinic acid or saline in alcohol withdrawal syndrome. An antidepressant action of TRH was demonstrated on injection day. Thereafter there were no reliable differences between treatment groups, perhaps due to rapid spontaneous remission in all groups. Two of five patients who received TRH showed a grossly subnormal TSH response.
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Data on 121 subjects, probands with affective disorders, their spouses and first degree relatives, are analyzed by multivariate methods to determine the relationships between physical types and propensity to illness. 56 variables are used: 39 anthropometric measures, age, sex, and 15 psychometric scales. In a canonical analysis between the anthropometric measures and the psychiatric scales, each canonical variable is found to be largely identified with a single psychometric component, as found in a principal components analysis of the psychometric scales. The two major anthropometric components, size and linearity, do not have any clear relationship with the psychometric components. However, a discriminant analysis that takes each individual as being in one of four clinical groups, normal, unipolar depressed, bipolar affective disorder or other, indicates a clear relationship between the anthropometric measures and mental illness; wide face and deep chest are associated with patients who have bipolar affective disorder. Half of the variables studied are sufficient to give virtually the same amount of discrimination as all 56 variables.
Both thyrotropin-releasing hormone (TRH) and amphetamine antagonize pentobarbital. They are more effective in the day than at night. This is true for TRH even when the dose of pentobarbital is increased at night to prolong sedation. Under this condition the day-night difference is lost for amphetamine. Both substances are more effective in cold ambient temperatures (18 degrees C) and less effective in warm temperatures, but their activity at warmer temperatures (37 degrees C) is still substantial. In contrast, somatotropin release-inhibiting factor (SRIF) augments the effects of pentobarbital at room temperature. This action is unaffected by time of day. However, the increase in sleeping time is lost in both a warm environment and in a cold environment.
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