HPIP is upregulated in colorectal cancer and regulates colorectal cancer cell proliferation, apoptosis and invasion

• Published in: Scientific reports 2015-03, Vol.5 (1), p.9429-9429, Article 9429
• Main Authors: Feng, Yingying, Xu, Xiaojie, Zhang, Yunjing, Ding, Jianhua, Wang, Yonggang, Zhang, Xiaopeng, Wu, Zhe, Kang, Lei, Liang, Yingchun, Zhou, LiYing, Song, Santai, Zhao, Ke, Ye, Qinong
• Format: Article
• Language: English
• Subjects: 1-Phosphatidylinositol 3-kinase; 13/109; 13/2; 13/31; 13/51; 13/89; 38/88; 45/44; 631/67/1504; 631/67/395; 64/60; 82/1; 82/80; 96/106; AKT protein; Animals; Apoptosis; Apoptosis - genetics; BAX protein; Caspase; Caspase-3; Cell activation; Cell adhesion & migration; Cell cycle; Cell Cycle - genetics; Cell Cycle Proteins - genetics; Cell Cycle Proteins - metabolism; Cell growth; Cell Line, Tumor; Cell migration; Cell Movement - genetics; Cell Proliferation; Colorectal cancer; Colorectal carcinoma; Colorectal Neoplasms - genetics; Colorectal Neoplasms - metabolism; Colorectal Neoplasms - pathology; Cyclin A; Cyclin B1; Cyclin D1; Disease Models, Animal; Epithelial-Mesenchymal Transition; Gene Expression; Gene Knockdown Techniques; Heterografts; Humanities and Social Sciences; Humans; Intracellular Signaling Peptides and Proteins - genetics; Intracellular Signaling Peptides and Proteins - metabolism; Leukemia; Lymphocytes B; MAP kinase; Mesenchyme; Mice; Mitogen-Activated Protein Kinases - metabolism; multidisciplinary; Poly(ADP-ribose) polymerase; Proto-Oncogene Proteins c-akt - metabolism; Science; Up-Regulation
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/srep09429

Hematopoietic pre-B cell leukemia transcription factor (PBX)-interacting protein (HPIP) was shown to play a role in cancer development and progression. However, the role of HPIP in colorectal cancer (CRC) is unknown. Here, we report that HPIP is overexpressed in most of CRC patients and predicts poor clinical outcome in CRC. HPIP promotes CRC cell proliferation via activation of G1/S and G2/M checkpoint transitions, concomitant with a marked increase of the positive cell cycle regulators, including cyclin D1, cyclin A and cyclin B1. HPIP inhibits CRC cell apoptosis accompanied by the decreased levels of BAX and PIG3, the inducers of apoptosis and the increased level of the apoptosis inhibitor BCL2. HPIP blocks caspase-3-mediated cleavage of PARP, an important apoptosis marker. HPIP promotes CRC cell migration and invasion and regulates epithelial-mesenchymal transition (EMT), which plays a critical role in cancer cell migration and invasion. Activation of MAPK/ERK1/2 and PI3k/AKT pathways is required for HPIP modulation of CRC cell proliferation, migration and EMT. Moreover, HPIP knockdown suppresses colorectal tumor growth in nude mice. These data highlight the important role of HPIP in CRC cell proliferation and progression and suggest that HPIP may be a useful target for CRC therapy.