@article {928, title = {Cucurbitacins-type triterpene with potent activity on mouse embryonic fi broblast from Cucumis prophetarum, cucurbitaceae}, journal = {Pharmacognosy Research}, volume = {3}, year = {2011}, month = {September 2011}, pages = {189-193}, type = {Original Article}, chapter = {189}, abstract = {

Background: Higher plants are considered as a well-known source of the potent anticancer metabolites with diversity of chemical structures. For instance, taxol is an amazing diterpene alkaloid had been lunched since 1990. Objective: To isolate the major compounds from the fruit extract of Cucumis prophetarum, Cucurbitaceae, which are mainly responsible for the bioactivities as anticancer. Materials and Methods: Plant material was shady air dried, extracted with equal volume of chloroform/methanol, and fractionated with different adsorbents. The structures of obtained pure compounds were elucidated with different spectroscopic techniques employing 1D ( 1 H and 13 C) and 2D (COSY, HMQC and HMBC) NMR (Nuclear Magnetic Resonance Spectrometry) and ESI-MS (Eelectrospray Ionization Mass Spectrometry) spectroscopy. The pure isolates were tested towards human cancer cell lines, mouse embryonic fibroblast (NIH3T3) and virally transformed form (KA3IT). Results: Two cucurbitacins derivatives, dihydocucurbitacin B (1) and cucurbitacin B (2), had been obtained. Compounds 1 and 2 showed potent inhibitory activities toward NIH3T3 and KA31T with IC50 0.2, 0.15, 2.5 and 2.0 μg/ml, respectively. Conclusion: The naturally cucurbitacin derivatives (dihydocucurbitacin B and cucurbitacin B) showed potent activities towards NIH3T3 and KA31T, could be considered as a lead of discovering a new anticancer natural drug.

}, keywords = {Cucumis prophetarum, cucurbitacin B, dihydrocucurbitacin B, mouse embryonic fibroblast and virally transformed form}, doi = {10.4103/0974-8490.85006}, author = {Seif-Eldin N Ayyad and Ahmed Abdel-Lateff and Salim A Basaif and Thomas Shier} } @article {732, title = {Antifouling Alkaloids from Crinum augustum (Amaryllidaceae)}, journal = {Pharmacognosy Research}, volume = {1}, year = {2009}, month = {January 2010 }, pages = {43-52}, type = {Original Article}, chapter = {43}, abstract = {

Fractionation and purification of the ethanolic extract of the bulbs of Crinum augustum Rox. (Amaryllidaceae) cultivated in Egypt yielded five alkaloids 6-methoxy-crinamine (1), crinamine (2), buphanisine (3), ungeremine (4), and hippadine (5); two fatty acid derivatives: myristic acid ethyl ester (6) and palmitic acid ethyl ester (7); four terpenoidal and steroidal compounds: ursolic acid (8), \%-sitosterol-O- \% glucopyranoside (9) and mixture of \%- sitosterol (10) and stigmasterol (11). The structures of all compounds were determined by interpretation of their spectroscopic data; 1D (1H and 13C), 2D (HSQC, COSY, DQF, NOE and HMBC) NMR; MS and UV analyses. The compounds (1-4) and (6-8) were tested towards biofouling activity using larvae of barnacle Balance amphitrie. Significant activities of 1, 2 and 3 with EC50 1.8, 1.2 and 0.75 :g/mL respectively, were observed.

}, keywords = {Amaryllidaceous, Anti-fouling, Crinum augustum, Natural Products}, author = {John Refaat and Ahmed Abdel-Lateff and Mohamed S. Kamel and Ahmed A. Ali and Mahmoud A. Ramadan and Tatsufumi Okino and Yasuyuki Nogata} } @article {773, title = {Cytotoxic Acetogenins from Annona glabra Cultivated in Egypt}, journal = {Pharmacognosy Research}, volume = {1}, year = {2009}, month = {January 2010 }, pages = {130-135}, type = {Original Article}, chapter = {130}, abstract = {

Bio-assay guided fraction of the methanolic extract of Annona glabra seeds (Annonaceae), cultivated in Egypt, revealed to the isolation of three bis-tetrahydrofuran acetogenins; squamocin-C (1), squamocin-D (2), and annonin I (3). Compounds 1 and 2 were obtained as stereoisomeric mixture. All isolates were assayed for their cytotoxicity twards brine shrimp and five in vitro cancer cell lines (A549, HT29, MCF 7, RPMI, and U251), and showed significant activity The structures of all compounds were determined by interpretation of their NMR and MS analyses.

}, keywords = {Acetogenin, Annona glabra, Annonaceae, Brine shrimp, Cytotoxic}, doi = {Nil}, author = {Ahmed Abdel-Lateff and Bassem S. El-Menshawi and Mohamed Y. Haggag and Mahmoud A. Nawwar} }