Transformation of isosteviol lactam by Fungi and the suppressive effects of its transformed products on LPS-induced iNOS expression in macrophages

Bo Hon Chou, Li Ming Yang, Shwu Fen Chang, Feng-Lin Hsu, Li Hsuan Wang, Wen Kuang Lin, Pan Chun Liu, Shwu Jiuan Lin

研究成果: 雜誌貢獻文章同行評審

13 引文 斯高帕斯(Scopus)

摘要

From the screening of 21 microbial strains, Absidia pseudocylindrospora ATCC 24169 and Aspergillus niger BCRC 32720 were found to reproducibly transform isosteviol lactam (4α-carboxy-13α-amino-13,16-seco-ent-19- norbeyeran-16-oic acid 13,16-lactam) (3) into various compounds. Preparative-scale transformation of 3 with Abs. pseudocylindrospora yielded two new hydroxylated compounds (4 and 5), with conservation of the lactam ring. Preparative-scale transformation of 3 with Asp. niger afforded seven new compounds, 6 and 9 - 14, together with the known compounds 7 and 8. A single-crystal X-ray diffraction experiment confirmed the structure of 14. The suppressive effects of compounds 1 - 14 on the lipopolysaccharide-induced expression of the inducible nitric oxide synthase gene in RAW 264.7 macrophages were examined by a reverse-transcription real-time PCR analysis. With the exception of 7, all other compounds significantly reduced levels of iNOS mRNA relative to control cells, which were induced by LPS alone. Compounds 2, 3, and 5 were similar in activity to dexamethasone, while 9 was more potent.

原文英語
頁(從 - 到)1379-1385
頁數7
期刊Journal of Natural Products
74
發行號6
DOIs
出版狀態已發佈 - 六月 24 2011

ASJC Scopus subject areas

  • 補充和替代醫學
  • 分子醫學
  • 有機化學
  • 分析化學
  • 藥學科學
  • 藥理
  • 藥物發現

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