Dkk-1 secreted by mesenchymal stem cells inhibits growth of breast cancer cells via depression of Wnt signalling.
We determined the molecular mechanism of inhibitory effect of human mesenchymal stem cells (hMSCs) on the growth of human MCF-7 breast cancer cells. Our finding showed that beta-catenin was down-regulated in MCF-7 cells by conditioned media from Z3 hMSCs, and the expression level of dickkopf-1 (Dkk-1) was higher in Z3 cells than that in MCF-7 cells. Neutralization of Dkk-1 and small interference RNA targeting Dkk-1 mRNA in Z3 cells attenuated the inhibitory effect of Z3 cells on MCF-7 cells. Overexpression of Dkk-1 in Z3 cells enhanced the inhibition. Therefore, Dkk-1 secreted by Z3 cells involves the inhibition via the Wnt pathway.
Qiao
Ling
L
Department of Biochemistry, College of Life Sciences, Nankai University, Tianjin 300071, PR China.
Xu
Zhi-Li
ZL
Zhao
Tie-Jun
TJ
Ye
Li-Hong
LH
Zhang
Xiao-Dong
XD
D000818:Animals; D001943:Breast Neoplasms / Q000473:pathology / Q000517:prevention & control*; D049109:Cell Proliferation; D002478:Cells, Cultured; D017077:Culture Media, Conditioned; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000032:analysis / Q000235:genetics / Q000502:physiology*; D059630:Mesenchymal Stem Cells / Q000502:physiology*; D051379:Mice; D016513:Mice, SCID; D015398:Signal Transduction / Q000502:physiology*; D051153:Wnt Proteins / Q000037:antagonists & inhibitors / Q000502:physiology*; D051176:beta Catenin / Q000502:physiology
D017077:Culture Media, Conditioned; C501126:DKK1 protein, human; D036341:Intercellular Signaling Peptides and Proteins; D051153:Wnt Proteins; D051176:beta Catenin