title: RNAi-mediated CD73 suppression induces apoptosis and cell-cycle arrest in human breast cancer cells.
abstract: Ecto-5'-nucleotidase (CD73), a cell surface protein that hydrolyzes extracellular AMP into adenosine and phosphate, is overexpressed in many solid tumors. In this study, we tested the hypothesis that increased CD73 may promote tumor progression by examining the effect of CD73 suppression via RNA interference and CD73 overexpression on tumor growth in vivo and in vitro. Using digitized whole-body images, plate clone forming assay and TUNEL assay in frozen tissue sections, we found that the cell growth rate was significantly lower in vivo and in vitro after CD73 suppression and late apoptosis was much higher in xenograft tumors developed from the CD73-siRNA transfected MB-MDA-231 clone (P1). By flow cytometry, the P1 cell cycle was arrested in the G0/G1 phase. Moreover, Bcl-2 was downregulated, while Bax and caspase-3 were upregulated with CD73 suppression. CD73 inhibitor α,β-methylene adenosine-5'-disphosphate (APCP) functioned similarly with RNAi-mediated CD73 suppression. In addition, in transfected MCF-7 cells, we found that CD73 overexpression increased cell viability and promoted cell cycle progression, depending on its enzyme activity. More intriguingly, CD73 overexpression in MCF-7 breast cancer cells produces a tumorigenic phenotype. We conclude that CD73 plays an important role in breast cancer growth by affecting cell cycle progression and apoptosis.
authors.affiliation: Department of Physiology and Pathophysiology, Shanghai Medical College, Shanghai, China.
authors.forename: Xiuling
authors.initials: X
authors.lastname: Zhi
authors.forename: Yingjian
authors.initials: Y
authors.lastname: Wang
authors.forename: Xuerui
authors.initials: X
authors.lastname: Zhou
authors.forename: Jerry
authors.initials: J
authors.lastname: Yu
authors.forename: Rongrong
authors.initials: R
authors.lastname: Jian
authors.forename: Shaoxian
authors.initials: S
authors.lastname: Tang
authors.forename: Lianhua
authors.initials: L
authors.lastname: Yin
authors.forename: Ping
authors.initials: P
authors.lastname: Zhou
mesh_terms: D015720:5'-Nucleotidase / Q000096:biosynthesis* / Q000235:genetics; D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D015153:Blotting, Western; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism*; D002453:Cell Cycle / Q000502:physiology*; D045744:Cell Line, Tumor; D002469:Cell Separation; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D051379:Mice; D008819:Mice, Nude; D034741:RNA, Small Interfering / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D046888:Tissue Array Analysis; D014162:Transfection
chemical_list: D034741:RNA, Small Interfering; D015720:5'-Nucleotidase