Pla2g16 phospholipase mediates gain-of-function activities of mutant p53.

p53(R172H/+) mice inherit a p53 mutation found in Li-Fraumeni syndrome and develop metastatic tumors at much higher frequency than p53(+/-) mice. To explore the mutant p53 metastatic phenotype, we used expression arrays to compare primary osteosarcomas from p53(R172H/+) mice with metastasis to osteosarcomas from p53(+/-) mice lacking metastasis. For this study, 213 genes were differentially expressed with a P value <0.05. Of particular interest, Pla2g16, which encodes a phospholipase that catalyzes phosphatidic acid into lysophosphatidic acid and free fatty acid (both implicated in metastasis), was increased in p53(R172H/+) osteosarcomas. Functional analyses showed that Pla2g16 knockdown decreased migration and invasion in mutant p53-expressing cells, and vice versa: overexpression of Pla2g16 increased the invasion of p53-null cells. Furthermore, Pla2g16 levels were increased upon expression of mutant p53 in both mouse and human osteosarcoma cell lines, indicating that Pla2g16 is a downstream target of the mutant p53 protein. ChIP analysis revealed that several mutant p53 proteins bind the Pla2g16 promoter at E26 transformation-specific (ETS) binding motifs and knockdown of ETS2 suppressed mutant p53 induction of Pla2g16. Thus, our study identifies a phospholipase as a transcriptional target of mutant p53 that is required for metastasis.

Citation

Shunbin Xiong, Huolin Tu, Madhusudhan Kollareddy, Vinod Pant, Qin Li, Yun Zhang, James G Jackson, Young-Ah Suh, Ana C Elizondo-Fraire, Peirong Yang, Gilda Chau, Mehrnoosh Tashakori, Amanda R Wasylishen, Zhenlin Ju, Hilla Solomon, Varda Rotter, Bin Liu, Adel K El-Naggar, Lawrence A Donehower, Luis Alfonso Martinez, Guillermina Lozano. Pla2g16 phospholipase mediates gain-of-function activities of mutant p53. Proceedings of the National Academy of Sciences of the United States of America. 2014 Jul 29;111(30):11145-50

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PMID: 25024203

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