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(American Journal of Pathology. 2007;170:152-159.)
© 2007 American Society for Investigative Pathology
DOI: 10.2353/ajpath.2007.060722

Pre-B-Cell Leukemia Transcription Factor 1 Regulates Expression of Valosin-Containing Protein, a Gene Involved in Cancer Growth

Ying Qiu*{dagger}, Yasuhiko Tomita{dagger}, Binglin Zhang{dagger}, Itsuko Nakamichi{dagger}, Eiichi Morii{dagger} and Katsuyuki Aozasa{dagger}

From the Department of Pathology,* Medical School of Tongji University, Shanghai, China; and the Department of Pathology,{dagger} Osaka University Graduate School of Medicine, Suita, Osaka, Japan

Valosin-containing protein (VCP) is involved in a wide variety of cellular functions. Our previous studies showed that the enhanced expression of VCP in cancer cells correlated with invasion and metastasis of cancers. Here, the regulatory mechanism for VCP transcription was investigated. Luciferase reporter constructs containing serially deleted 5'-flanking region of the VCP gene were transfected into MCF7 mammary carcinoma cell line, in which VCP was abundantly expressed. The deletion and mutation at the two binding motifs for pre-B-cell leukemia transcription factor 1 (PBX1) reduced the luciferase activity, indicating that these two PBX1 motifs mediated the transactivation of the VCP gene. Chromatin immunoprecipitation assay showed the binding of PBX-1 to the 5'-flanking region of the VCP gene. The knockdown of PBX1 by siRNA decreased the expression level of VCP. VCP is reported to maintain cell viability after the treatment of tumor necrosis factor-{alpha}. The viability of tumor necrosis factor-{alpha}-treated cells was significantly reduced in PBX1 knockdown MCF7. These findings indicate that PBX1 plays a crucial role in VCP expression and function and that the PBX-VCP pathway might be important for cell survival under cytokine stress.






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Copyright © 2007 by the American Society for Investigative Pathology.