Induction of growth hormone release by glycyrrhizae radix on rat.
Induction of growth hormone (GH) by Glycyrrhizae Radix (GR), one of the most popular herbal medicine, and its major ingredients were studied in rat pituitary cells in vitro and in vivo assay. The MeOH extract and the n-hexane (HX) fraction of GR induced rat GH (rGH) release up to 1.89 times (0.34 +/- 0.04 nM) and 4.59 times (0.83 +/- 0.03 nM), compared to the basal level (p < 0.05). Among many ingredients isolated and purified from GR both glycyrrhetinic acid and glycyrrhizin induced significantly rGH release compared to the control (p < 0.05). After an intravenous injection of rat growth hormone releasing hormone (rGHRH) (10 microg/kg) as positive control, in SD rats, Tmax of plasma rGH level was 10 min, C(max) was 3.84 +/- 0.01 nM (n = 3), and enhanced plasma rGH level returned to the baseline in 90 min. Both AUC(0-90) (area under the curve) of plasma rGH level after HX fraction and that after rGHRH administration were increased significantly from the basal level, respectively (p < 0.01). In conclusions, HX fraction is the most active fraction of MeOH extract of GR in rGH induction.
Lee
Ho Young
HY
Department of Drug Research & Development, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea.
Jung
Dae Young
DY
Ha
Hyekyung
H
Kang
Sam Sik
SS
Kim
Ju Sun
JS
Kim
Chungsook
C
D000324:Adrenocorticotropic Hormone / Q000378:metabolism; D000818:Animals; D002478:Cells, Cultured; D006034:Glycyrrhetinic Acid / Q000302:isolation & purification / Q000494:pharmacology; D006035:Glycyrrhiza; D019695:Glycyrrhizic Acid / Q000302:isolation & purification / Q000494:pharmacology; D013006:Growth Hormone / Q000097:blood / Q000378:metabolism*; D013007:Growth Hormone-Releasing Hormone / Q000494:pharmacology; D007986:Luteinizing Hormone / Q000378:metabolism; D008297:Male; D010902:Pituitary Gland / Q000187:drug effects / Q000378:metabolism; D010936:Plant Extracts / Q000494:pharmacology; D010946:Plants, Medicinal; D051381:Rats; D017207:Rats, Sprague-Dawley
D010936:Plant Extracts; D019695:Glycyrrhizic Acid; D000324:Adrenocorticotropic Hormone; D007986:Luteinizing Hormone; D013006:Growth Hormone; D013007:Growth Hormone-Releasing Hormone; D006034:Glycyrrhetinic Acid