Planta Med 2002; 68(5): 392-396
DOI: 10.1055/s-2002-32071
Original Paper
Pharmacology
© Georg Thieme Verlag Stuttgart · New York

Expression of Inducible Nitric Oxide Synthase by
α-Hederin in Macrophages

Hye Gwang Jeong1, 2 , Chul Yung Choi1
  • 1Department of Pharmacy, College of Pharmacy Chosun University, Kwangju, South Korea
  • 2Research Center for Proteineous Materials, Chosun University, Kwangju, South Korea
Further Information

Publication History

July 10, 2001

October 21, 2001

Publication Date:
07 June 2002 (online)

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Abstract

α-Hederin, a triterpene saponin, is reported to have antitumor activities; however, the mechanism underlying its therapeutic effects is not known. In this study, we examine the effects of α-hederin on the release of nitric oxide (NO) and the level of inducible nitric oxide synthase (iNOS) gene expression in mouse macrophages. α-Hederin elicited a dose-dependent increase in NO secretion. Reverse-transcription polymerase chain reaction showed that the increased NO secretion was due to an increase in iNOS mRNA. Transient expression assays with NF-κB binding sites linked to the luciferase gene revealed that the increased level of iNOS mRNA induced by α-hederin was mediated by the NF-κB transcription factor complex. These results demonstrate that α-hederin stimulates NO release and is able to upregulate iNOS expression through NF-κB transactivation, which may be a mechanism, whereby α-hederin elicits its biological effects.