New Monascus metabolites: structure elucidation and toxicological properties studied with immortalized human kidney epithelial cells

Molecular Nutrition & Food Research
Anja KnechtHans-Ulrich Humpf

Abstract

Monascus sp. are used for the production of red yeast rice, which has been applied in Asian food and medicine for centuries. The fungi form several secondary metabolites, among others the monascopyridines A and B. We have now detected two new monascopyridines (named C and D) with similar UV absorption spectra and maxima at 306-307 nm in red rice fermented with M. purpureus. The new monascopyridines have the same chromophores as the already known and differ in a missing gamma-lactone ring only. Monascopyridine C has a hexanoyl side chain, whereas monascopyridine D is the higher homologue with an octanoyl side chain. The toxicological properties of monascopyridines were studied using immortalized human kidney epithelial cells, displaying cytotoxic effects in micromolar concentrations with median effective concentration values between 20.7 and 43.2 micromol/L, depending on the compound and method used. The monascopyridines C and D did not induce apoptosis. However, they caused a rise of the mitotic index from 3.21 +/- 0.27% (control) to maximum 8.14 +/- 0.89% (monascopyridine D) by an accumulation of cells in the metaphase with a simultaneous decrease of cells in the ana- and telophase. Monascopyridine-induced metaphase arrest is ...Continue Reading

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Citations

Oct 30, 2012·Applied Microbiology and Biotechnology·Yanli FengFusheng Chen
Dec 3, 2011·Natural Product Research·Ines FerseHans-Ulrich Humpf
Nov 10, 2010·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ya-Wen HsuTzu-Ming Pan
Dec 10, 2013·Food & Function·You-Liang HsiehCheng-Hong Hsieh
Nov 18, 2020·Journal of Fungi·Lan Lin, Jianping Xu
Oct 10, 2008·Journal of Agricultural and Food Chemistry·Sameer A S MapariUlf Thrane
Dec 25, 2009·Journal of Agricultural and Food Chemistry·Marie-Odile Loret, Sandrine Morel
Apr 16, 2013·Chemical Reviews·Jin-Ming GaoJian-Chun Qin
Dec 13, 2007·Journal of Agricultural and Food Chemistry·Zhibing HuangYanping Li
Sep 28, 2021·Journal of Applied Microbiology·Vishu ChaudharyHarsh Panwar

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