title: Inhibition of proliferative and invasive capacities of breast cancer cells by arginine-glycine-aspartic acid peptide in vitro.
abstract: The Arg-Gly-Asp (RGD) sequence was selected by using phage-display peptides to target tumors, focusing on targeting alpha(v) integrins in tumor blood vessels. Recent studies suggest that peptides containing the RGD sequence can bind to tumor cells, as well as tumor endothelial cells. To investigate whether the RGD peptide has other effects on tumor cells expressing alpha(v) integrins, besides its tumor targeting capability, we designed and synthesized a 10-amino peptide that contained the RGD sequence in a cyclic conformation with a disulfide bond, which specifically bound to breast cancer cell lines MDA-MB-231 and MCF-7. We found that this RGD peptide, GCGGRGDGGC, inhibited tumor cell proliferation in a dose-dependent manner, and also induced apoptosis and G1-phase cell cycle arrest in both of the cell lines that bound and internalized the peptide. Normal ovarian epithelial cells, which did not bind the RGD peptide, were unaffected. RGD peptide treatment also reduced cell invasiveness in both cell lines in vitro. This study suggests that the RGD peptide not only possesses tumor targeting capacity, but also has direct tumor cytotoxic and invasiveness inhibition effects dependent on the blockage of alpha(v) integrin activity, which would make it more efficient in tumor targeting therapy.
authors.affiliation: Cancer Biology Research Center, Tongji Hospital, Tongji Medical School, Huazhong University of Science and Technology, Wuhan, Hubei, PR China.
authors.forename: Wanhua
authors.initials: W
authors.lastname: Yang
authors.forename: Li
authors.initials: L
authors.lastname: Meng
authors.forename: Hui
authors.initials: H
authors.lastname: Wang
authors.forename: Rui
authors.initials: R
authors.lastname: Chen
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
authors.forename: Xiangyi
authors.initials: X
authors.lastname: Ma
authors.forename: Gang
authors.initials: G
authors.lastname: Xu
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Zhou
authors.forename: Shixuan
authors.initials: S
authors.lastname: Wang
authors.forename: Yunping
authors.initials: Y
authors.lastname: Lu
authors.forename: Ding
authors.initials: D
authors.lastname: Ma
mesh_terms: D000970:Antineoplastic Agents / Q000378:metabolism / Q000494:pharmacology / Q000627:therapeutic use*; D017209:Apoptosis; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000473:pathology*; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D006801:Humans; D009361:Neoplasm Invasiveness; D009842:Oligopeptides / Q000378:metabolism / Q000494:pharmacology / Q000627:therapeutic use*
chemical_list: D000970:Antineoplastic Agents; D009842:Oligopeptides; C047981:arginyl-glycyl-aspartic acid