Abstract：
:We have shown previously that the antitumor drug, hydroxyurea (HU) is able to induce dose-dependent increases in plasma corticosterone levels in the rat. The drug was administered early in the morning, when the levels of circulating glucocorticoids are low in this species. Normally, in humans under physiological conditions, cortisol levels are elevated early in the morning, to which a sharp decrease follows between 09:00 and 11:00 hours. In a group of healthy volunteers, HU significantly attenuated the decrease in cortisol levels occurring between 09:00 and 11:00 hours with respect to the same subjects receiving placebo. Given the different circadian rhythms of the two species, such an effect of HU in man appeared to be the counterpart of the increase in serum corticosterone occurring in the rat. In the present study, we have attempted to ascertain whether HU is also able to influence adrenocortical function in patients with acute and chronic myeloproliferative disorders undergoing treatments with high doses of the drug. We found that the rate of decline in circulating cortisol observed in patients during the time interval 09:00-11:00 hours was overlapping to that previously found in healthy volunteers treated with HU. In patients, serum cortisol was still elevated at 15:00 hours, since average hormone levels were near to the upper normal limit of the assay. However, in the absence of a control group treated with placebo, we could not draw any clear-cut conclusion as to whether HU was able to modify significantly the pattern of cortisol release in the study population.
journal_name
Pharmacol Resjournal_title
Pharmacological researchauthors
Navarra P,Aloe-Spiriti MA,Boccarini F,Montefusco E,Latagliata R,Preziosi P,Petti MCdoi
10.1006/phrs.2000.0709keywords:
subject
Has Abstractpub_date
2000-10-01 00:00:00pages
389-92issue
4eissn
1043-6618issn
1096-1186pii
S1043-6618(00)90709-6journal_volume
42pub_type
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