{"title":"New cytotoxic dolabellane and dolastane diterpenes from Brown seaweed Dictyota dichotoma","authors":"Kolukula Ashwini , Bandi Siva , Penta Poornima , Solipeta Divya Reddy , Hashnu Dutta , Vedula Girija Sastry , Katragadda Suresh Babu","doi":"10.1016/j.ejmcr.2025.100286","DOIUrl":null,"url":null,"abstract":"<div><div>Five new dolabellane (<strong>1</strong>–<strong>5</strong>), three dolastane (<strong>6</strong>–<strong>8</strong>) type diterpenes together with five previously identified congeners (<strong>9</strong>–<strong>13</strong>), were isolated from the organic extracts of the brown seaweed <em>Dictyota dichotoma,</em> collected in the Mandapam coast, Tamil Nadu. The structures and relative stereochemistry of the new isolates <strong>1</strong>–<strong>8</strong> were determined on the basis of extensive spectroscopic (NMR and Mass spec) data, whereas the structures of <strong>10</strong> and <strong>12</strong> were verified by X-ray diffraction analysis. A plausible biogenetic relationship between undescribed compounds <strong>1</strong>–<strong>8</strong> were also proposed. The <em>in vitro</em> anti-cancer activity of the isolates was examined against a panel of cancer cell lines, including DU145 (prostate), B16F10 (melanoma), HeLa (cervical), and MDA-MB231 (breast) using MTT assay. The screening results showed that majority of the isolated compounds exhibited moderate to potent activities against tested cell lines. Among the tested, compounds <strong>4</strong> and <strong>7</strong> manifested potent activities with an IC<sub>50</sub> value of 3.53 ± 0.05 and 2.18 ± 0.06 μM respectively, against B16F10 and DU145 cells. Further, detailed fluorescence assays, scratch assay and flow cytometry analysis revealed that the compounds <strong>4</strong> and <strong>7</strong> diminished proliferation and arrested cell cycle in the G0 phase and G0/G1 phase, which induced cell death by apoptosis. Overall, this study provided that compounds <strong>4</strong> and <strong>7</strong> could serve as lead molecules for the development of potent anti-cancer agents.</div></div>","PeriodicalId":12015,"journal":{"name":"European Journal of Medicinal Chemistry Reports","volume":"15 ","pages":"Article 100286"},"PeriodicalIF":0.0000,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"European Journal of Medicinal Chemistry Reports","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2772417425000421","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Five new dolabellane (1–5), three dolastane (6–8) type diterpenes together with five previously identified congeners (9–13), were isolated from the organic extracts of the brown seaweed Dictyota dichotoma, collected in the Mandapam coast, Tamil Nadu. The structures and relative stereochemistry of the new isolates 1–8 were determined on the basis of extensive spectroscopic (NMR and Mass spec) data, whereas the structures of 10 and 12 were verified by X-ray diffraction analysis. A plausible biogenetic relationship between undescribed compounds 1–8 were also proposed. The in vitro anti-cancer activity of the isolates was examined against a panel of cancer cell lines, including DU145 (prostate), B16F10 (melanoma), HeLa (cervical), and MDA-MB231 (breast) using MTT assay. The screening results showed that majority of the isolated compounds exhibited moderate to potent activities against tested cell lines. Among the tested, compounds 4 and 7 manifested potent activities with an IC50 value of 3.53 ± 0.05 and 2.18 ± 0.06 μM respectively, against B16F10 and DU145 cells. Further, detailed fluorescence assays, scratch assay and flow cytometry analysis revealed that the compounds 4 and 7 diminished proliferation and arrested cell cycle in the G0 phase and G0/G1 phase, which induced cell death by apoptosis. Overall, this study provided that compounds 4 and 7 could serve as lead molecules for the development of potent anti-cancer agents.