Antitumor sterols from the mycelia of Cordyceps sinensis
摘要:
Activity guided fractionations led to the isolation of two antitumor compounds 5 alpha,8 alpha-epidioxy-24(R)-methylcholesta-6,22-dien-3 beta-D-glucopyranoside and 5,6-epoxy-24(R)-methylcholesta-7,22-dien-3 beta-ol from the methanol extract of Cordyceps sinensis. Two previously known compounds, ergosteryl-3-O-beta-D-glucopyranoside and 22-dihydroergosteryl-3-O-beta-D-glucopyranoside were also isolated. The structures of hitherto unknown sterols were established by 1D and 2D NMR spectroscopic techniques with the former synthesized in order to confirm the identity of the sugar moiety by chemical correlation. The glycosylated form of ergosterol peroxide was found to be a greater inhibitor to the proliferation of K562, Jurkat, WM-1341, HL-60 and RPMI-8226 tumor cell lines by 10 to 40% at 10 mu g/ml than its previously identified aglycone, 5 alpha,8 alpha-epidioxy-24(R)-methylcholesta-6,22-dien-3 beta-ol. (C) 1999 Elsevier Science Ltd. All rights reserved.
Highly efficient synthesis and antitumor activity of monosaccharide saponins mimicking components of Chinese folk medicineCordyceps sinensis
摘要:
Ergosterol 3-O-beta-D-glucopyranoside (1a) and ergosterol 3-O-beta-D-galactopyranoside (1b) were highly efficiently synthesized and evaluated for their inhibitory activities against two tumor cell lines. The structures of these compounds were extensively confirmed by H-1, C-13 NMR, IR, and HRMS. Compounds 1a and 1b exhibited interesting cytotoxic profiles. The antitumor activity of compound 1a was higher than that of 1b.
Synthesis of Ergosterol and 5,6-Dihydroergosterol Glycosides and Their Inhibitory Activities on Lipopolysaccharide-Induced Nitric Oxide Production
作者:HoonGyu Park、Tae Hoon Lee、Fei Chang、Hyun Ji Kwon、Jiyoung Kim、Hakwon Kim
DOI:10.5012/bkcs.2013.34.5.1339
日期:2013.5.20
We have synthesized several glycosyl ergosterols and 5,6-dihydroergosterols (DHE) and examined their effects on production of nitric oxide (NO) and iNOS protein expression in LPS-treated RAW264.7 macrophage cells. Our results showed that DHE derivatives inhibited production of NO and iNOS protein expression more strongly than ergosterol derivative. Especially, DHE-Glc exhibited most potent inhibitory activity without cytotoxicity up to the concentration of $100\mu}M$.
Ergosteryl-β-glucosidase (Egh1) involved in sterylglucoside catabolism and vacuole formation in<i>Saccharomyces cerevisiae</i>
作者:Takashi Watanabe、Motohiro Tani、Yohei Ishibashi、Ikumi Endo、Nozomu Okino、Makoto Ito
DOI:10.1093/glycob/cwv045
日期:2015.10
Sterylglucosides (SGs) are composed of a glucose and sterol derivatives, and are distributed in fungi, plants and mammals. We recently identified EGCrP1 and EGCrP2 (endoglycoceramidase-related proteins 1 and 2) as a β-glucocerebrosidase and steryl-β-glucosidase, respectively, in Cryptococcus neoformans. We herein describe an EGCrP2 homologue (Egh1; ORF name, Yir007w) involved in SG catabolism in Saccharomyces cerevisiae. The purified recombinant Egh1 hydrolyzed various β-glucosides including ergosteryl β-glucoside (EG), cholesteryl β-glucoside, sitosteryl β-glucoside, para-nitrophenyl β-glucoside, 4-methylumberifellyl β-glucoside and glucosylceramide. The disruption of EGH1 in S. cerevisiae BY4741 (egh1Δ) resulted in the accumulation of EG and fragmentation of vacuoles. The expression of EGH1 in egh1Δ (revertant) reduced the accumulation of EG, and restored the morphology of vacuoles. The accumulation of EG was not detected in EGH1 and UGT51(ATG26) double-disrupted mutants (ugt51Δegh1Δ), indicating that EG was synthesized by Ugt51(Atg26) and degraded by Egh1 in vivo. These results clearly demonstrated that Egh1 is an ergosteryl-β-glucosidase that is functionally involved in the EG catabolic pathway and vacuole formation in S. cerevisiae.
THE PREPARATION AND ANTIRACHITIC ACTIVATION OF SOME DERIVATIVES OF ERGOSTEROL AND CHOLESTEROL
作者:D. W. MacCorquodale、Harry Steenbock、Homer Adkins
DOI:10.1021/ja01369a051
日期:1930.6
Gisvold, Journal of the American Pharmaceutical Association (1912), 1934, vol. 23, p. 402
作者:Gisvold
DOI:——
日期:——
Molecular cloning and characterization of one member of 3β-hydroxy sterol glucosyltransferase gene family in Withania somnifera
作者:Lokendra Kumar Sharma、Bhaskara Reddy Madina、Pankaj Chaturvedi、Rajender Singh Sangwan、Rakesh Tuli
DOI:10.1016/j.abb.2007.01.024
日期:2007.4
Sterol glycosides are constituents of plant cell membranes. Glucosylations of the sterols are catalyzed by sterol glucosyltransferases (SGTs), which are members of family 1 glycosyltransferases. We have identified the family of SGT genes expressed in the leaves of a medicinal plant Withania somnifera. One member (SGTL1) of this gene family was cloned. The full-length cDNA sequence of SGTL1 represents 2532 bp, comprising untranslated regions (UTRs) of 337 and 89 bp at the 5' and 3' ends, respectively. The amino acid sequence deduced from the 2103 bp open reading frame (ORF) showed homology (67-45%) to the reported plant SGTs. The presence of two putative transmembrane domains suggested the association of SGTL1 with membrane. The SGTL1 was expressed in Escherichia coli and recombinant enzyme from the supernatant was partially purified and biochemically characterized. The relative activity and kinetic properties of SGTL1 for different sterols were compared with a recombinant SGT (GenBank Accession No. Z83833) of Arabidopsis thaliana (AtSGT). Both the recombinant enzymes showed activity with 3-beta-OH sterols. The distribution of SGTL1 transcript in W. somnifera, as determined by quantitative PCR, showed higher expression in roots and mature leaves. Expression of the SGTL1 transcript in the leaves of W. somnifera was enhanced following the application of salicylic acid. In contrast, it decreased rapidly on exposure of the plants to heat shock, suggesting functional role of the enzyme in biotic and abiotic stresses. (c) 2007 Elsevier Inc. All rights reserved.