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  • Title: Hypothalamic-pituitary-adrenal regulation, neurotransmitters and affective disorders.
    Author: Janowsky DS, Risch SC, Huey LY, Judd LL, Rausch JL.
    Journal: Peptides; 1983; 4(5):775-84. PubMed ID: 6140674.
    Abstract:
    Considerable evidence has accumulated indicating that alterations in neurotransmitters may play a role in the etiology of affective disorders on the one hand, and in the regulation of the limbic-hypothalamic-pituitary-adrenal axis (LHPA) on the other. Acetylcholine, norepinephrine, serotonin, GABA, the opioid polypeptides and dopamine have all been implicated in both phenomena. Although some contradictory evidence exists, norepinephrine, opioids, and GABA appear inhibitory, and serotonin and acetylcholine appear excitatory of the LHPA axis. In a correlative study, non-suppression of cortisol by dexamethasone correlated positively and significantly with methylphenidate-induced euphoric and antidepressant responses, and methadone induced growth hormone responses, possibly suggesting catecholamine and opioid receptor hypersensitivity. Although the overall effects of the cholinomimetic, physostigmine, did not correlate with dexamethasone non-suppression, strong positive correlations were found in a subgroup, consisting of affective disorder patients, between non-suppression of cortisol by dexamethasone and the physostigmine response, suggesting cholinergic hypersensitivity in the non-suppressing subjects.
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