Impairment of apoptosis promotes abnormal cellular proliferation and accumulation of genetic alterations. Identifying bioactive compounds extracted from seaweeds that induce apoptosis in cancer cells may be explored a...Impairment of apoptosis promotes abnormal cellular proliferation and accumulation of genetic alterations. Identifying bioactive compounds extracted from seaweeds that induce apoptosis in cancer cells may be explored as new agents for cancer chemoprevention and/or chemotherapy. The present study aimed to determine the chemical composition and biological activity of the chloroform crude extract and fractions from Antarctic seaweed Desmarestia anceps. The chloroform extract was obtained by three consecutive macerations and the fractionation by vacuum liquid chromatography. The chemical characterization of the extract and fractions was performed through Gas Chromatography. The cytotoxicity of the crude extract and fractions was evaluated by the MTT assay. Cell death and cell cycle evaluation after 24 hours of exposure to chloroform extract were performed by flow cytometry. A total of 48 compounds were identified. The results indicate that chloroform extract and its fractions presented cytotoxic activity against HCT 116 cell line in a dose dependent-manner. Proapoptotic events were observed after chloroform extract exposition, which promoted an increase of multinucleated cells and reduced cell viability. This study was the first to explore cytotoxic potential of seaweed D. anceps fractions against HCT colorectal cancer cell line, suggesting that these macroalgae may be a promising candidate against anticancer activity.展开更多
Background/Aim: Antarctic seaweeds are considered a promising source of compounds with anticancer activity. Colorectal cancer (CRC) is one of the most incident cancers with high mortality rates worldwide. This work ai...Background/Aim: Antarctic seaweeds are considered a promising source of compounds with anticancer activity. Colorectal cancer (CRC) is one of the most incident cancers with high mortality rates worldwide. This work aimed to characterize chemically extracts of the Antarctic macroalgae Iridaea cordata, Cystosphaera jacquinotii and Desmarestia anceps and to evaluate the cytotoxic effects against human colon cancer HCT 116 cell line. Materials and Methods: The extracts were obtained by depletion using an ultrasound probe and were identified by High-Performance Liquid Chromatography (HPLC) and Gas Chromatography coupled with Mass Spectrometry (GC-MS). Cell viability was determined by MTT assay. Results: Hexanic and chloroform extracts of the I. cordata and the hexanic, chloroform and methanolic extracts of D. anceps were able to inhibit growth of colorectal cancer cells in the three different incubation times (24, 48 and 72 h). Through GC analysis, 01 compounds were identified in the hexane extract and 02 compounds in the chloroform extract of the algae I. cordata. The hexane extract of D. anceps macroalgae presented 5 compounds, chloroform extract 10 and methanolic extract 3 respectively, with special highlight to fucosterol. Carotenoid analysis by HPLC identified β-carotene in all species, while zeaxanthin was present in the spectrum of I. cordata and C. jacquinotii. Fucoxanthin and violaxanthin were confirmed in the brown seaweeds C. jacquinotii and D. anceps. Conclusion: Extracts of macroalgae I. Cordata and D. anceps may be a source of therapeutic agents against CRC.展开更多
文摘Impairment of apoptosis promotes abnormal cellular proliferation and accumulation of genetic alterations. Identifying bioactive compounds extracted from seaweeds that induce apoptosis in cancer cells may be explored as new agents for cancer chemoprevention and/or chemotherapy. The present study aimed to determine the chemical composition and biological activity of the chloroform crude extract and fractions from Antarctic seaweed Desmarestia anceps. The chloroform extract was obtained by three consecutive macerations and the fractionation by vacuum liquid chromatography. The chemical characterization of the extract and fractions was performed through Gas Chromatography. The cytotoxicity of the crude extract and fractions was evaluated by the MTT assay. Cell death and cell cycle evaluation after 24 hours of exposure to chloroform extract were performed by flow cytometry. A total of 48 compounds were identified. The results indicate that chloroform extract and its fractions presented cytotoxic activity against HCT 116 cell line in a dose dependent-manner. Proapoptotic events were observed after chloroform extract exposition, which promoted an increase of multinucleated cells and reduced cell viability. This study was the first to explore cytotoxic potential of seaweed D. anceps fractions against HCT colorectal cancer cell line, suggesting that these macroalgae may be a promising candidate against anticancer activity.
基金Brazilian Research Funding Program(CAPES),University of Caxias do Sul(UCS),Brazilian Algae Research Group(RedeAlgas),Antarctic Brazilian Program(PROANTAR)for financial support for the development of this work.
文摘Background/Aim: Antarctic seaweeds are considered a promising source of compounds with anticancer activity. Colorectal cancer (CRC) is one of the most incident cancers with high mortality rates worldwide. This work aimed to characterize chemically extracts of the Antarctic macroalgae Iridaea cordata, Cystosphaera jacquinotii and Desmarestia anceps and to evaluate the cytotoxic effects against human colon cancer HCT 116 cell line. Materials and Methods: The extracts were obtained by depletion using an ultrasound probe and were identified by High-Performance Liquid Chromatography (HPLC) and Gas Chromatography coupled with Mass Spectrometry (GC-MS). Cell viability was determined by MTT assay. Results: Hexanic and chloroform extracts of the I. cordata and the hexanic, chloroform and methanolic extracts of D. anceps were able to inhibit growth of colorectal cancer cells in the three different incubation times (24, 48 and 72 h). Through GC analysis, 01 compounds were identified in the hexane extract and 02 compounds in the chloroform extract of the algae I. cordata. The hexane extract of D. anceps macroalgae presented 5 compounds, chloroform extract 10 and methanolic extract 3 respectively, with special highlight to fucosterol. Carotenoid analysis by HPLC identified β-carotene in all species, while zeaxanthin was present in the spectrum of I. cordata and C. jacquinotii. Fucoxanthin and violaxanthin were confirmed in the brown seaweeds C. jacquinotii and D. anceps. Conclusion: Extracts of macroalgae I. Cordata and D. anceps may be a source of therapeutic agents against CRC.
