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. 2006 May;71(5):392-402.
doi: 10.1016/j.steroids.2005.12.003. Epub 2006 Feb 15.

Cytotoxic biotransformed products from cinobufagin by Mucor spinosus and Aspergillus Niger

Xiangjiu He  1 , Jinshan Tang, Aimin Qiao, Guanghui Wang, Miaomiao Jiang, Rui Hai Liu, Xinsheng Yao
Affiliations

Cytotoxic biotransformed products from cinobufagin by Mucor spinosus and Aspergillus Niger

Xiangjiu He et al. Steroids. 2006 May.

Abstract

Cinobufagin (1) was one of important cardenolidal steroids and major components of Chan'Su, a famous traditional Chinese medicine. Bioconversion of cinobufagin by the fungi of Mucor spinosus and Aspergillus niger were investigated. Nine bioconversion products were obtained from M. spinosus and seven products from A. niger. Their structures were elucidated by high-resolution fast atom bombardment mass spectroscopy (HR-FAB-MS), extensive NMR techniques, including (1)H NMR, (13)C NMR, DEPT, (1)H-(1)H correlation spectroscopy (COSY), two-dimensional nuclear Overhauser effect correlation spectroscopy (NOESY), heteronuclear multiple quantum coherence (HMQC) and heteronuclear multiple bond coherence (HMBC). The in vitro cytotoxic activities against human hepatoma cells (HepG2, SMMC-7221 and BEL-7402) and human leukemia cells (K562, HL-60 and HEL) of all bioconversion products were determined by the MTT method, and their structure-activity relationships (SAR) were discussed.

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