Abstract
Three new naturally-occurring 3,4-dihydroquinoline-2-one derivatives: 8-Hydroxy-3,4-dihydro-1H-quinolin-2-one (1), 3,4-dihydro-1H-quinolin-2-one (2) and 8-methoxy-3,4-dihydro-1H-quinolin-2-one (3), together with linoleic acid, glycerol monolinoleate and phenyl acetic acid were isolated from the Streptomyces sp. LGE21, derived from Lemna gibba. Structures of the new alkaloids (1–3) were determined by extensive 1D and 2D NMR, and MS measurements. In vitro cytotoxic studies of 1–3 and linoleic acid, in comparison with the original extract were assayed against liver cancer HEPG2 cell line and the human cervix carcinoma cell line (KB-3-1). The antimicrobial activity of the strain extract and compounds 1–3 were achieved as well. The new metabolites exhibited weak cytotoxic activities against cancer cell lines and growth inhibitory activity against a panel of tested bacterial strains.
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Acknowledgements
The authors are thankful to the NMR and MS Departments in Bielefeld University for the spectral measurements. We thank Carmela Michalek for biological activity testing and Marco Wißbrock for technical assistance. This research work has been financed by the German Academic Exchange Service (DAAD) with funds from the German Federal Foreign Office in the frame of the Research Training Network “Novel Cytotoxic Drugs from Extremophilic Actinomycetes” (ProjectID57166072).
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Mahmoud, M.M., Abdel-Razek, A.S., Frese, M. et al. 3,4-Dihydro-quinolin-2-one derivatives from extremophilic Streptomyces sp. LGE21. Med Chem Res 27, 1834–1842 (2018). https://doi.org/10.1007/s00044-018-2195-8
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DOI: https://doi.org/10.1007/s00044-018-2195-8