Mechanism of gastrointestinal absorption of glycyrrhizin in rats

Z. Wang, Yuji Kurosaki, T. Nakayama, T. Kimura

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

The mechanism of gastrointestinal absorption of glycyrrhizin (GZ) was examined in rats. Using an in sita loop technique, it was found that the intestinal absorption of glycyrrhetic acid (GA), a major metabolite of GZ, was larger than that of GZ and that the absorption of GA was larger in the small intestine than in the large intestine. Although GZ was poorly absorbable, both GZ and GA were detected in rat plasma after oral administration of GZ, suggesting that GZ can be absorbed in both parent and metabolite forms, although their bioavailabilities were low. GZ was hydrolyzed to GA by rat gastric and large-intestinal contents, but not by the small-intestinal contents. This hydrolysis was diminished after boiling of the gastrointestinal contents and was not observed in the gastrointestinal contents of kanamycin-treated rats. These results suggest that GZ is hydrolyzed by bacteria in the stomach and large-intestinal contents and that most of the GA formed is absorbed from the large intestine. Since GZ was extensively excreted in bile after intravenous administration, the first-pass elimination might be the reason for its low bioavailability, in addition to the poor mucosal permeability.

Original languageEnglish
Pages (from-to)1399-1403
Number of pages5
JournalBiological and Pharmaceutical Bulletin
Volume17
Issue number10
Publication statusPublished - 1994

Fingerprint

Glycyrrhizic Acid
Glycyrrhetinic Acid
Gastrointestinal Contents
Large Intestine
Biological Availability
Stomach
Gastrointestinal Absorption
Kanamycin
Intestinal Absorption
Bile
Intravenous Administration
Small Intestine
Oral Administration
Permeability
Hydrolysis

Keywords

  • biliary excretion
  • first-pass elimination effect
  • glycyrrhetic acid
  • glycyrrhizin
  • intestinal absorption
  • pseudo-germ-free rat

ASJC Scopus subject areas

  • Molecular Medicine
  • Pharmacology, Toxicology and Pharmaceutics(all)

Cite this

Mechanism of gastrointestinal absorption of glycyrrhizin in rats. / Wang, Z.; Kurosaki, Yuji; Nakayama, T.; Kimura, T.

In: Biological and Pharmaceutical Bulletin, Vol. 17, No. 10, 1994, p. 1399-1403.

Research output: Contribution to journalArticle

Wang, Z. ; Kurosaki, Yuji ; Nakayama, T. ; Kimura, T. / Mechanism of gastrointestinal absorption of glycyrrhizin in rats. In: Biological and Pharmaceutical Bulletin. 1994 ; Vol. 17, No. 10. pp. 1399-1403.
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