Background: Ovarian cancer is a possibly lethal gynecological malignancy and this study utilized phage display\ntechnology to screen and identify peptides that specifically bind to ovarian cancer cells and explored the effects of\nthese peptides on ovarian cancer cells in vitro and in vivo.\nMethods: The phage displayed peptide library was used to isolate the peptides binding to and internalizing into\nthe ovarian carcinoma cells. Positive phage clones were characterized with DNA sequencing and bioinformatics\nanalysis and then validated with immunofluorescence. Subsequently, the selected peptides were investigated for\ntheir cancer-related functions, including cell adhesion, spreading, motility, and invasion in vitro and in vivo.\nResults: Peptide1 read as SWQIGGNwas the positive peptide and showed preferential binding to the target cells.\nPeptide 1 also inhibited cell proliferation, migration, invasion and adhesion of ovarian cancer HO8910 cells in vitro.\nIn vivo, Peptide 1 led to a lower tumorigenicity of HO8910 cells, which was characterized by the inhibitory effect on\ntumor growth and metastasis of ovarian cells.\nConclusion: These studies demonstrate that the phage display-identified tumor cell-binding peptide was able to\ncontrol ovarian cancer cell viability, migration, invasion, and adhesion capacity in vitro as well as tumor growth and\nmetastasis in vivo. Future studies will be aimed at evaluating the clinical efficacy of the peptide SWQIGGN in ovarian\ncancer patients.
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