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Arthrinins A-D: Novel diterpenoids and further constituents from the sponge derived fungus Arthrinium sp.
MedLine Citation:
PMID:  21741249     Owner:  NLM     Status:  Publisher    
Bioassay-guided fractionation of a methanolic extract of the fungus Arthrinium sp., isolated from the Mediterranean sponge Geodia cydonium, afforded 10 natural products including five new diterpenoids, arthrinins A-D (1-4) and myrocin D (5). In addition, five known compounds were obtained, which included myrocin A (6), norlichexanthone (7), anomalin A (8), decarboxycitrinone (9) and 2,5-dimethyl-7-hydroxychromone (10). The structures of all isolated compounds were unambiguously elucidated based on extensive 1D and 2D NMR and HR-MS analyzes. The absolute configuration of arthrinins A-D (1-4) was established by the convenient Mosher method performed in NMR tubes and by interpretation of the ROESY spectra. Antiproliferative activity of the isolated compounds was assessed in vitro against four different tumor cell lines, including mouse lymphoma (L5178Y), human chronic myelogenous leukemia (K562), human ovarian cancer (A2780) and cisplatin-resistant ovarian cancer cells (A2780CisR), using the MTT assay. Norlichexanthone (7) and anomalin A (8) exhibited the strongest activities with IC(50) values ranging from 0.40 to 74.0μM depending on the cell line investigated. This was paralleled by the inhibitory activity of both compounds against 16 cancer related protein kinases including aurora-B, PIM1, and VEGF-R2. In vitro IC(50) values of 7 and 8 against these three protein kinases ranged from 0.3 to 11.7μM. Further investigation of the potential antitumoral activity of compounds 5-8 was performed in an in vitro angiogenesis assay against human umbilical vascular endothelial cells (HUVEC) sprouting induced by vascular endothelial growth factor A (VEGF-A). Anomalin A (8), myrocin D (5) and myrocin A (6) inhibited VEGF-A dependent endothelial cell sprouting with IC(50) values of 1.8, 2.6 and 3.7μM, respectively, whereas norlichexanthone (7) was inactive.
Sherif S Ebada; Barbara Schulz; Victor Wray; Frank Totzke; Michael H G Kubbutat; Werner E G Müller; Alexandra Hamacher; Matthias U Kassack; Wenhan Lin; Peter Proksch
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-6
Journal Detail:
Title:  Bioorganic & medicinal chemistry     Volume:  -     ISSN:  1464-3391     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9413298     Medline TA:  Bioorg Med Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Ltd. All rights reserved.
Institut für Pharmazeutische Biologie und Biotechnologie, Heinrich-Heine-Universität, Geb. 26.23, Universitätsstrasse 1, D-40225 Düsseldorf, Germany; Department of Pharmacognosy and Phytochemistry, Faculty of Pharmacy, Ain-Shams University, Organization of African Unity 1, 11566 Cairo, Egypt.
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