Abstract:
OBJECTIVE:To determine if human growth hormone (hGH) replacement therapy alters pharmacokinetics of hydrocortisone (CS) substitution in hypopituitary adults. DESIGN:To this aim, we analysed serum and salivary CS profiles 270 min after oral CS administration at baseline and 6 and 12 months after initiation of hGH replacement therapy. METHODS:Serum IGF-I, cortisol-binding globulin (CBG), thyroxine-binding globulin (TBG) and sex hormone-binding hormone (SHBG) were measured using commercially available radioimmunoassays. In-house immunofluorometric assays were employed for measurements of CS and hGH. RESULTS:hGH replacement did not change total serum CS bioavailability (area under the serum cortisol profile curve). Interference of orally administered CS with salivary measurement of free CS (fCS) caused significant bias. Therefore, fCS levels were calculated from their total CS and cortisol-binding globulin (CBG) levels. CBG decreased by approximately 30% after both 6 and 12 months of hGH replacement therapy (n=20, P<0.01). A significant negative correlation between deltaCBG (CBG6months-CBGbaseline) and deltaIGF-I (IGF-I6months-IGF-Ibaseline) was observed (P=0.04). The calculated values of free CS tended to increase with physiological hGH replacement, but this effect was marginal and did not reach statistical significance. In contrast to the CBG concentrations, plasma levels of sex hormone-binding globulin and thyroxine-binding globulin were essentially stable. CONCLUSION:Given that no clinically relevant alterations in pharmacokinetics of CS were evoked by initiation of hGH replacement in hypopituitary adults, we conclude that CS substitution does not require dose adjustment after initiation of hGH replacement.
journal_name
Eur J Endocrinoljournal_title
European journal of endocrinologyauthors
Tschöp M,Lahner H,Feldmeier H,Grasberger H,Morrison KM,Janssen OE,Attanasio AF,Strasburger CJdoi
10.1530/eje.0.1430769subject
Has Abstractpub_date
2000-12-01 00:00:00pages
769-73issue
6eissn
0804-4643issn
1479-683Xpii
1430769journal_volume
143pub_type
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journal_title:European journal of endocrinology
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journal_title:European journal of endocrinology
pub_type: 临床试验,杂志文章
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更新日期:2011-07-01 00:00:00
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更新日期:2009-06-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 临床试验,杂志文章
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更新日期:2002-07-01 00:00:00
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