Termitomycesphins A–D, Novel Neuritogenic Cerebrosides from the Edible Chinese Mushroom Termitomyces albuminosus
摘要:
Four novel cerebrosides, termitomycesphins A-D, were isolated from the edible Chinese mushroom Termitomyces albuminosus (Berk.) Helm. ('Jizong' in Chinese), shown to induce neuronal differentiation in rat PC12 cells. The absolute stereostructures were elucidated by spectroscopic methods and chemical derivatization. These new cerebrosides have a unique C19 hydroxylated sphingosine base with branching around the middle. Termitomycesphins A and C possessing a C16 alpha-hydroxy fatty acid showed a higher neuritogenic activity than did termitomycesphins B and D possessing a C18 alpha-hydroxy fatty acid. (C) 2000 Elsevier Science Ltd. All rights reserved.
New Cerebrosides from a Marine Sponge Haliclona (Reniera) sp.
作者:Taeseong Park、Tayyab Ahmad Mansoor、Pramod Bapurao Shinde、Baoquan Bao、Jongki Hong、Jee Hyung Jung
DOI:10.1248/cpb.57.106
日期:——
A chemical investigation of the MeOH extract of a marine sponge Haliclona (Reniera) sp., collected off the coast of Ulleung Island, Korea, led to the isolation of thirteen new cerebrosides (1--3, 5--14), along with a known analogue (4). Their structures were elucidated on the basis of 1D and 2D NMR spectroscopy, MS spectrometry, and chemical method. The major new features of these glucocerebrosides
Five new ceramides, neritinaceramides A (1), B (2), C (3), D (4) and E (5), together with six known ceramides (6-11), two known alkyl glycerylethers (12 and 13) and a known nucleoside (14), were isolated frommarinebryozoanBugulaneritina, which inhabits the South China Sea. The structures of the new compounds were elucidated as (2S,3R,3'S,4E,8E,10E)-2-(hexadecanoylamino)-4,8,10-octadecatriene-l
The Antitumor Constituents from Hedyotis Diffusa Willd
作者:Changfu Wang、Xuegang Zhou、Youzhi Wang、Donghua Wei、Chengjie Deng、Xiaoyun Xu、Ping Xin、Shiqin Sun
DOI:10.3390/molecules22122101
日期:——
As a TCM, Hedyotisdiffusa Willd. has been using to treat malignant tumors, and many studies also showed that the extracts fromHedyotisdiffusa Willd. possessed evident antitumor activities. Therefore, we carried out chemical study on Hedyotisdiffusa Willd. and investigated the cytotoxicity of the obtained compounds on a panel of eight tumor cell lines. As a result, four new compounds were isolated
Flavusides A (1) and B (2), two new antibacterial cerebroside derivatives, and the previously described phomaligol A (3), kojic acid (4), methyl kojic acid (5), and dimethyl kojic acid (6) have been isolated from the extract of a marine isolate of the fungus Aspergillus flavus. The structure and absolute stereochemistry of two cerebrosides were assigned on the basis of NMR and Tandem FAB-MS/MS experiments. Compounds 1, 2, and 3 exhibited a mild antibacterial activity against Staphylococcus aureus, methicillin-resistant S. aureus, and multidrug-resistant S. aureus. The minimum inhibitory concentration (MIC) values for each strain are as follows: compounds 1 and 2 showed 15.6 μg/ml for S. aureus and 31.2 μg/ml for methicillin-resistant S. aureus and multidrug-resistant S. aureus, and compound 3 exhibited 31.2 μg/ml for S. aureus and methicillin-resistant S. aureus and 62.5 μg/ml for multidrug-resistant S. aureus.
The four new cerebrosides 1–4 possessing a unique C18 9‐methylsphinga‐4,8‐dienine‐related moiety and a cyclicoctapeptide, 5, possessing alternating proline and glycine moietes were isolated from the Tuber indicum fermentation mycelium. Their structures were established on the basis of a spectroscopic analysis including NMR and HR‐ESI‐MS, as well as an acidic methanolysis experiment. To the best of