title: p53 Attenuates cancer cell migration and invasion through repression of SDF-1/CXCL12 expression in stromal fibroblasts.
abstract: The p53 tumor suppressor acts as a major barrier against cancer. To a large extent, this is due to its ability to maintain genome stability and to eliminate cancer cells from the replicative pool through cell-autonomous mechanisms. However, in addition to its well-documented functions within the malignant cancer cell, p53 can also exert non-cell-autonomous effects that contribute to tumor suppression. We now report that p53 can suppress the production of the chemokine SDF-1 in cultured fibroblasts of both human and mouse origin. This is due to a p53-mediated down-regulation of SDF-1 mRNA, which can be exacerbated on activation of p53 by the drug Nutlin-3. SDF-1 promotes the migration and invasiveness of cells that express its cognate receptor CXCR4. Indeed, medium conditioned by p53-deficient fibroblasts induces cancer cells towards increased directional migration and invasiveness, which are largely reversed by CXCR4 antagonist peptides. Because SDF-1 produced by stromal fibroblasts plays an important role in cancer progression and metastasis, our findings suggest that the ability of p53 to suppress stromal SDF-1 production may be an important mechanism whereby it does its non-cell-autonomous tumor suppressor function.
authors.affiliation: Departments of Molecular Cell Biology and Immunology, The Weizmann Institute of Science, Rehovot, Israel and Department of Oncology, Sheba Medical Center, Tel Hashomer, Israel.
authors.forename: Neta
authors.initials: N
authors.lastname: Moskovits
authors.forename: Alexander
authors.initials: A
authors.lastname: Kalinkovich
authors.forename: Jair
authors.initials: J
authors.lastname: Bar
authors.forename: Tsvee
authors.initials: T
authors.lastname: Lapidot
authors.forename: Moshe
authors.initials: M
authors.lastname: Oren
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000502:physiology*; D002478:Cells, Cultured; D054377:Chemokine CXCL12; D019743:Chemokines, CXC / Q000037:antagonists & inhibitors* / Q000096:biosynthesis; D005347:Fibroblasts / Q000378:metabolism / Q000473:pathology; D006801:Humans; D051379:Mice; D009361:Neoplasm Invasiveness; D009369:Neoplasms / Q000378:metabolism* / Q000473:pathology*; D017154:Stromal Cells / Q000378:metabolism / Q000473:pathology; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*
chemical_list: C515255:CXCL12 protein, human; D054377:Chemokine CXCL12; D019743:Chemokines, CXC; C515256:Cxcl12 protein, mouse; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53