Effect of growth hormone on hepatic cytochrome P450 activity in healthy elderly men.

Article Details

Citation

Jurgens G, Lange KH, Reuther LO, Rasmussen BB, Brosen K, Christensen HR

Effect of growth hormone on hepatic cytochrome P450 activity in healthy elderly men.

Clin Pharmacol Ther. 2002 Mar;71(3):162-8. doi: 10.1067/mcp.2002.121373.

PubMed ID
11907490 [ View in PubMed
]
Abstract

OBJECTIVE: Our objective was to study the effect of recombinant human growth hormone (rhGH) on hepatic cytochrome P450 (CYP) activity in 30 healthy elderly men. METHODS: The study was carried out as a randomized, double-blind, placebo-controlled parallel-group study. rhGH or placebo was administered for a period of 12 weeks. CYP activity was measured before, after 12 weeks of rhGH and placebo administration, and at 4 weeks after termination of rhGH and placebo administration with use of the biomarker reactions of CYP1A2 (caffeine), CYP2C19 (mephenytoin), CYP2D6 (sparteine), CYP3A4 (endogenous cortisol metabolism), and antipyrine clearance as common markers of CYP activity. RESULTS: The metabolic ratio of caffeine increased significantly in the group that received growth hormone compared with placebo (median difference, 4.55; 95% confidence interval (CI), 1.64 to 8.60; versus -0.90; 95% CI, -5.70 to 1.36), indicating an induction of CYP1A2. Moreover, the S/R ratio of mephenytoin showed a small but significant increase (median difference, 0.02; 95% CI, 0 to 0.31; versus 0; 95% CI, -0.01 to 0.06), indicating an inhibition of CYP2C19. There were no significant changes of the metabolic ratios of cortisol and sparteine or the antipyrine clearance compared with placebo. CONCLUSIONS: These results indicate that growth hormone induces CYP1A2 and, to a lesser extent, inhibits CYP2C19 in elderly men, but it exerts no effects on CYP2D6 and CYP3A4. Although the induction of CYP1A2 may be of some clinical relevance, the small inhibition of CYP2C19 is probably unimportant.

DrugBank Data that Cites this Article

Drug Enzymes
DrugEnzymeKindOrganismPharmacological ActionActions
LonapegsomatropinCytochrome P450 1A2ProteinHumans
Unknown
Inducer
Details
LonapegsomatropinCytochrome P450 2C19ProteinHumans
Unknown
Inhibitor
Details
SomapacitanCytochrome P450 1A2ProteinHumans
Unknown
Inducer
Details
SomapacitanCytochrome P450 2C19ProteinHumans
Unknown
Inhibitor
Details
SomatotropinCytochrome P450 1A2ProteinHumans
Unknown
Inducer
Details
SomatotropinCytochrome P450 2C19ProteinHumans
Unknown
Inhibitor
Details
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