title: Synthesis of selenium-containing Artemisia sphaerocephala polysaccharides: Solution conformation and anti-tumor activities in vitro.
abstract: It has been reported in our previous work that selenized Artemisia sphaerocephala polysaccharides (SeASPs) with the Se content range of 168-1703μg/g were synthesized by using Na2SeO3/HNO3/BaCl2 system. In the present work, the solution property of SeASP was studied by using size exclusion chromatography combined with multi angle laser light scattering (SEC-MALLS). A decrease in df values indicated that SeASPs with different conformational features that were highly dependent on MW. SeASPs exhibited a more rigid conformation (df value of 1.29-1.52) in low molecular weight range (MW of 1.026-1.426×10(4)g/mol) and compact spherical conformation in high molecular weight range (MW of 2.268-4.363×10(4)g/mol). It could be due to the degradation of polysaccharide chains in HNO3, which was supported in monosaccharide composition analysis. Congo red (CR) spectrophotometric method and atomic force microscopy (AFM) results also confirmed the conformational transition and the evidence on the shape of the rigid chains. In vitro anti-tumor assays, SeASP2 displayed greater anti-proliferative effects against three tumor cell lines (hepatocellular carcinoma HepG-2 cells, lung adenocarcinom A549 cells and cervical squamous carcinoma Hela cells) in a dose-dependent manner. This suggested that selenylation could significantly enhance the anti-tumor activities of polysaccharide derivatives in vitro.
authors: College of Life Science, Northwest Normal University, Lanzhou 730070, People's Republic of China; Bioactive Products Engineering Research Center For Gansu Distinctive Plants, Northwest Normal University, Lanzhou 730070, People's Republic of China. Electronic address: nuno-vai@163.com.
authors: Junlong
authors: J
authors: Wang
authors: College of Life Science, Northwest Normal University, Lanzhou 730070, People's Republic of China.
authors: Qingyao
authors: Q
authors: Li
authors: College of Life Science, Northwest Normal University, Lanzhou 730070, People's Republic of China.
authors: Aijuan
authors: A
authors: Bao
authors: College of Life Science, Northwest Normal University, Lanzhou 730070, People's Republic of China.
authors: Xiurong
authors: X
authors: Liu
authors: College of Life Science, Northwest Normal University, Lanzhou 730070, People's Republic of China.
authors: Junyuan
authors: J
authors: Zeng
authors: College of Life Science, Northwest Normal University, Lanzhou 730070, People's Republic of China.
authors: Xiaopin
authors: X
authors: Yang
authors: College of Life Science, Northwest Normal University, Lanzhou 730070, People's Republic of China; Bioactive Products Engineering Research Center For Gansu Distinctive Plants, Northwest Normal University, Lanzhou 730070, People's Republic of China.
authors: Jian
authors: J
authors: Yao
authors: College of Life Science, Northwest Normal University, Lanzhou 730070, People's Republic of China; Bioactive Products Engineering Research Center For Gansu Distinctive Plants, Northwest Normal University, Lanzhou 730070, People's Republic of China; Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China.
authors: Ji
authors: J
authors: Zhang
authors: Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China.
authors: Ziqiang
authors: Z
authors: Lei
mesh_terms: D000072283:A549 Cells; D000972:Antineoplastic Agents, Phytogenic / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D019306:Artemisia / Q000737:chemistry*; D004305:Dose-Response Relationship, Drug; D006367:HeLa Cells; D056945:Hep G2 Cells; D006801:Humans; D009369:Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D011134:Polysaccharides / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D012643:Selenium / Q000737:chemistry*
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D011134:Polysaccharides; D012643:Selenium
keywords: Anti-tumor activity; Artemisia sphaerocephala; Selenized polysaccharide; Solution conformation