Structure Revision and Cytotoxic Activity of the Scabrosin Esters, Epidithiopiperazinediones from the Lichen Xanthoparmelia scabrosa

1999 ◽  
Vol 52 (4) ◽  
pp. 279 ◽  
Author(s):  
Michael A. Ernst-Russell ◽  
John A. Elix ◽  
Christina L. L. Chai ◽  
David C. R. Hockless ◽  
Alanna M. Hurne ◽  
...  
Keyword(s):  
Cytotoxic Activity ◽  
Cell Line ◽  
Structure Elucidation ◽  
Carcinoma Cell ◽  
Spectroscopic Methods ◽  
Two Dimensional ◽  
Human Breast ◽  
X Ray ◽  
Structure Revision ◽  
Spectral Assignment

The scabrosin esters (1){(4), isolated from the lichen Xanthoparmelia scabrosa, were reanalysed by modern one- and two-dimensional n.m.r. spectroscopic methods, including 15N n.m.r. spectroscopy, and single-crystal X-ray structural analysis. This reinvestigation has resulted in the unambiguous structure elucidation and complete spectral assignment of these metabolites and established them to be a family of epidithiopiperazinedione derivatives. A new scabrosin ester, scabrosin butyrate hexanoate (5), has also been isolated and its structure determined, including assignment of absolute configuration. Several scabrosins were found to exhibit potent cytotoxic activity against the murine P815 mastocytomia cell line (IC50 c. 0·5 µM) and the human breast MCF7 carcinoma cell line (IC50 c. nM). Compounds which contain a dithiopiperazinedione moiety have not previously been identified in lichenized fungi.

scholarly journals Bathyptilones: Terpenoids from an Antarctic Sea Pen, Anthoptilum grandiflorum (Verrill, 1879)

Marine Drugs ◽  
2019 ◽  
Vol 17 (9) ◽  
pp. 513 ◽  
Author(s):  
Santana A.L. Thomas ◽  
Anthony Sanchez ◽  
Younghoon Kee ◽  
Nerida G. Wilson ◽  
Bill J. Baker
Keyword(s):  
Mass Spectrometry ◽  
Nmr Spectroscopy ◽  
Cell Line ◽  
Structure Elucidation ◽  
Two Dimensional ◽  
Mammalian Cell Line ◽  
X Ray ◽  
X Ray Crystallography ◽  
Austral Autumn ◽  
Skeleton Structure

An Antarctic coral belonging to the order Pennatulacea, collected during the 2013 austral autumn by trawl from 662 to 944 m depth, has yielded three new briarane diterpenes, bathyptilone A-C (1–3) along with a trinorditerpene, enbepeanone A (4), which bears a new carbon skeleton. Structure elucidation was facilitated by one- and two-dimensional NMR spectroscopy, mass spectrometry and confirmed by X-ray crystallography. The three compounds were screened in four cancer cell lines. Bathyptilone A displayed selective nanomolar cytotoxicity against the neurogenic mammalian cell line Ntera-2.

scholarly journals New Haloterpenes from the Marine Red Alga Laurencia papillosa: Structure Elucidation and Biological Activity

Marine Drugs ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 35
Author(s):  
Mohamed Shaaban ◽  
Ghada S. E. Abou-El-Wafa ◽  
Christopher Golz ◽  
Hartmut Laatsch
Keyword(s):  
Biological Activity ◽  
Crude Extract ◽  
Structure Elucidation ◽  
Antimicrobial Activities ◽  
Red Alga ◽  
Spectroscopic Methods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical Structures ◽  
Terpene Derivatives

Analysis of the air-dried marine red alga Laurencia papillosa, collected near Ras-Bakr at the Suez gulf (Red Sea) in Egypt delivered five new halogenated terpene derivatives: aplysiolic acid (1), 7-acetyl-aplysiol (2), aplysiol-7-one (3), 11,14-dihydroaplysia-5,11,14,15-tetrol (5a), and a new maneonene derivative 6, named 5-epi-maneolactone. The chemical structures of these metabolites were characterized employing spectroscopic methods, and the relative and absolute configurations were determined by comparison of experimental and ab initio-calculated NMR, NOE, ECD, and ORD data, and by X-ray diffraction of 2 and 6. The antimicrobial activities of the crude extract and compounds 1–3, 5a and 6 were studied.

scholarly journals UBE2Q1 in a Human Breast Carcinoma Cell Line: Overexpression and Interaction with p53

2015 ◽  
Vol 16 (9) ◽  
pp. 3723-3727 ◽  
Author(s):  
Sayed Mohammad Shafiee ◽  
Mozhgan Rasti ◽  
Atefeh Seghatoleslam ◽  
Tayebeh Azimi ◽  
Ali Akbar Owji
Keyword(s):  
Breast Carcinoma ◽  
Cell Line ◽  
Carcinoma Cell ◽  
Human Breast Carcinoma ◽  
Carcinoma Cell Line ◽  
Breast Carcinoma Cell Line ◽  
Human Breast ◽  
Human Breast Carcinoma Cell

scholarly journals Novel Synthesis Method of Micronized Ti-Zeolite Na-A and Cytotoxic Activity of Its Silver Exchanged Form

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
H. F. Youssef ◽  
W. H. Hegazy ◽  
H. H. Abo-almaged ◽  
G. T. El-Bassyouni
Keyword(s):  
Cytotoxic Activity ◽  
Cell Line ◽  
Carcinoma Cell ◽  
Synthesis Method ◽  
Carcinoma Cell Line ◽  
Breast Adenocarcinoma ◽  
Synthetic Process ◽  
Colon Cell ◽  
Colon Cell Line

The core-shell method is used as a novel synthetic process of micronized Ti-Zeolite Na-A which involves calcination at 700°C of coated Egyptian Kaolin with titanium tetrachloride in acidic medium as the first step. The produced Ti-coated metakaolinite is subjected to microwave irradiation at low temperature of 80°C for 2 h. The prepared micronized Ti-containing Zeolites-A (Ti-Z-A) is characterized by FTIR, XRF, XRD, SEM, and EDS elemental analysis. Ag-exchanged form of Ti-Z-Ag is also prepared and characterized. The Wt% of silver exchanged onto the Ti-Zeolite structure was determined by atomic absorption spectra. Thein vitrocytotoxic activity of Ti-Z-Ag against human hepatocellular carcinoma cell line (HePG2), colon cell line carcinoma (HCT116), lung carcinoma cell line (A549), and human Caucasian breast adenocarcinoma (MCF7) is reported. The results were promising and revealed that the exchanged Ag form of micronized Ti-Zeolite-A can be used as novel antitumor drug.

Selenylation, Characterization and Cytotoxic Activity of Seleno-Astragalus Polysaccharide

2013 ◽  
Vol 411-414 ◽  
pp. 3146-3149 ◽  
Author(s):  
Yu Bin Ji ◽  
Fang Dong ◽  
Miao Yu
Keyword(s):  
Cytotoxic Activity ◽  
Human Breast Cancer ◽  
Human Breast ◽  
X Ray Diffraction ◽  
X Ray ◽  
Astragalus Polysaccharide ◽  
Series Of Experiments ◽  
Dose Dependent ◽  
Mcf 7

This paper investigated the selenylation, characterization and cytotoxic activity of seleno-Astragalus polysaccharide. Firstly, Se-APS was synthesized under reaction time at 8 h, reaction temperature at 80 °C, ratio of Na2SeO3 to APS at 1.0 g/g and water bath shaking rate at 40 r/min. Then, a series of experiments were designed to investigate the characterization and cytotoxicity of Se-APS. The result indicated that the characterization of Se-APS was significantly different from APS, except for X-ray diffraction. Additionally, MTT assay conformed that Se-APS could significantly inhibit the proliferation of human breast cancer MCF-7 cells in dose-dependent and time-dependent manners.

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