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      Design and preparation of derivatives of oleanolic and glycyrrhetinic acids with cytotoxic properties

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          The structural modification of natural products with the aim to improve the anticancer activity is a popular current research direction. The pentacyclic triterpenoid compounds oleanolic acid (OA) and glycyrrhetinic acid (GA) are distributed widely in nature.


          In this study, various oleanolic acids and glycyrrhetinic acids were designed and synthesized by using the combination principle. The in vitro anticancer activities of new OA and GA derivatives were tested by the 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) method with SGC-7901 (gastric cancer), MCF-7 (breast cancer), Eca-109 (esophageal cancer), HeLa (cervical cancer), Hep-G2 (hepatoma cancer) and HSF (normal human skin fibroblast) cells.

          Results and conclusion

          The screening results showed that the compound 3m presented the highest inhibitory activities against SGC-7901, MCF-7 and Eca-109 cell lines with IC 50 values of 7.57±0.64 μM, 5.51±0.41 μM and 5.03±0.56 μM, respectively. In addition, this compound also showed effective inhibition of Hep-G2 cells with an IC 50 value of 4.11±0.73 μM. Moreover, compound 5b showed the strongest inhibitory activity against Hep-G2 cells with an IC 50 value of 3.74±0.18 μM and compound 3l showed strong selective inhibition of the HeLa cells with the lowest IC 50 value of 4.32±0.89 μM. A series of pharmacology experiments indicated that compound 5b could induce Hep-G2 cells autophagy and apoptosis. These compounds will expand the structural diversity of anti-cancer targets and confirm the prospects for further research.

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          Most cited references 37

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          Exclusion of Kaposi Sarcoma From Analysis of Cancer Burden—Reply

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            Cinnamic acid derivatives as anticancer agents-a review.

            Cinnamic acid and its phenolic analogues are natural substances. Chemically, in cinnamic acids the 3-phenyl acrylic acid functionality offers three main reactive sites; substitution at the phenyl ring, addition at the α,β- unsaturation and the reactions of the carboxylic acid functionality. Owing to these chemical aspects cinnamic acid derivatives received much attention in medicinal research as traditional as well as recent synthetic antitumor agents. We observed that in spite of their rich medicinal tradition, cinnamic acid derivatives and their anticancer potentials remained underutilized for several decades since the first published clinical use in 1905. In last two decades, there has been huge attention towards various cinnamoyl derivatives and their antitumor efficacy. This review provides a comprehensive and unprecedented literature compilation concerning the synthesis and biological evaluation of various cinnamoyl acids, esters, amides, hydrazides and related derivatives in anticancer research. We envisage that our effort in this review contributes a much needed and timely addition to the literature of medicinal research.
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              In vitro and in vivo antiallergic effects of Glycyrrhiza glabra and its components.

               T. J. Kim,  Yeong Kim,  S Lee (2007)
              Licorice (Glycyrrhiza glabra L., Leguminosae) is frequently used in traditional medicine to treat inflammatory and allergic diseases. In this study, the main components (glycyrrhizin, 18beta-glycyrrhetinic acid, isoliquiritin, and liquiritigenin) were isolated from licorice, and their anti-allergic effects, such as antiscratching behavior and IgE production-inhibitory activity, were evaluated both in vitro and in vivo. Liquiritigenin and 18beta-glycyrrhetinic acid most potently inhibited the degranulation of RBL-2H3 cells induced by IgE with the antigen (DNP-HSA) and rat peritoneal mast cells induced by compound 48/80. Liquiritigenin and 18beta-glycyrrhetinic acid potently inhibited the passive cutaneous anaphylactic reaction as well as the scratching behavior in mice induced by compound 48/80. These components inhibited the production of IgE in ovalbumin-induced asthma mice but liquiritigenin had little effect. This suggests that the antiallergic effects of licorice are mainly due to glycyrrhizin, 18beta-glycyrrhetinic acid, and liquiritigenin, which can relieve IgE-induced allergic diseases such as dermatitis and asthma.

                Author and article information

                Drug Des Devel Ther
                Drug Des Devel Ther
                Drug Design, Development and Therapy
                Drug Design, Development and Therapy
                Dove Medical Press
                21 May 2018
                : 12
                : 1321-1336
                [1 ]Marine College, Shandong University, Weihai, China
                [2 ]Zhong Yuan Academy of Biological Medicine, Liaocheng People’s Hospital/Affiliated Liaocheng Hospital, Taishan Medical University, Liaocheng, China
                [3 ]School of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, China
                [4 ]School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai, China
                Author notes
                Correspondence: Hui-Jing Li, School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China, Tel +86 1 866 031 8701, Email lihuijing@ 123456iccas.ac.cn
                Qi-Yong Huai, Marine College, Shandong University, Weihai 264209, China, Tel +86 1 328 787 5796, Email huaiqy01@ 123456163.com

                These authors contributed equally to this work

                © 2018 Wang et al. This work is published and licensed by Dove Medical Press Limited

                The full terms of this license are available at https://www.dovepress.com/terms.php and incorporate the Creative Commons Attribution – Non Commercial (unported, v3.0) License ( http://creativecommons.org/licenses/by-nc/3.0/). By accessing the work you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed.

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