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Corticotropin releasing hormone: therapeutic implications and medicinal chemistry developments.

Corticotropin releasing hormone (CRH, sometimes known as CRF) is an endogenous 41 amino acid peptide that has been implicated in the onset of pregnancy, the 'fight or flight' response, in addition to a large number of physiological disorders. Recently, medicinal chemists have developed a number of potent and selective compounds that show promise in a vast array of therapeutic uses. Herein we review the current status of research.

Amino Acid Sequence↗

High-dose ketoconazole therapy and adrenal and testicular function in humans.

Ketoconazole, an oral antifungal, when given in conventional doses, transiently blocks testosterone synthesis and adrenal response to corticotropin. Higher therapeutic doses (ie, 800 to 1,200 mg/day), even once daily, caused more prolonged blockade. In some men, the serum testosterone concentrations were always subnormal. Bound and free testosterone values were equally diminished. Oligospermia and azospermia after prolonged therapy were noted. Impotence and decreased libido were found. Gynecomastia appeared more common than with lower doses. Depressed response to corticotropin was pronounced. Urine cortisol excretion was depressed. The blockade appeared related to the serum ketoconazole concentration. Instances of normal hormone levels or responsiveness were associated with low ketoconazole concentrations. The hormonal effects were generally unrelated to duration of therapy, although there may have been partial reversal with continued therapy. These effects appeared reversible with discontinuation of therapy. Patients receiving ketoconazole should be considered potentially unable to mount an adrenal stress response and may require testosterone supplementation.

Adrenal Glands↗