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DOC-2/DAB2 interactive protein regulates proliferation and mobility of nasopharyngeal carcinoma cells by targeting

Bin Wang1, Qianqian Gu2, Jian Li1

  • 1Department of Otorhinolaryngology, Cangzhou Central Hospital, Cangzhou, Hebei 061000, P.R. China.

Oncology Reports
|June 7, 2017
PubMed

Insights

Downregulation of DAB2IP (DOC-2/DAB2 interactive protein) is linked to nasopharyngeal carcinoma (NPC) progression and poor survival. Restoring DAB2IP inhibits NPC growth and metastasis by targeting the PI3K/Akt pathway.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Tumor suppressors are crucial in preventing cancer, with DAB2IP (DOC-2/DAB2 interactive protein) identified as a novel suppressor in various malignancies.
  • The role and expression of DAB2IP in nasopharyngeal carcinoma (NPC) remained uninvestigated prior to this study.

Purpose of the Study:

  • To investigate the expression, function, and underlying mechanism of DAB2IP in nasopharyngeal carcinoma (NPC).
  • To evaluate DAB2IP as a potential therapeutic target for NPC.

Main Methods:

  • Quantitative real-time PCR (qRT-PCR) to assess DAB2IP mRNA levels in NPC tissues and cell lines.
  • In vitro assays (proliferation, colony formation, migration, invasion) and in vivo studies (subcutaneous and lung metastasis in nude mice) to evaluate DAB2IP function.
  • Western blotting and pathway analysis to elucidate the mechanism, focusing on the PI3K/Akt pathway and its downstream targets.

Main Results:

  • DAB2IP expression was significantly decreased in NPC tissues and cell lines compared to normal tissues and cells.
  • Reduced DAB2IP expression correlated with lymph node metastasis, advanced clinical stage, and poorer patient survival (overall and disease-free).
  • DAB2IP restoration inhibited NPC cell proliferation, colony formation, migration, invasion, subcutaneous tumor growth, and lung metastasis. Mechanistically, DAB2IP suppressed the PI3K/Akt pathway, reducing downstream targets cyclin D1 and MMP7.

Conclusions:

  • DAB2IP acts as a tumor suppressor in NPC by inhibiting cell growth and metastasis, likely through the PI3K/Akt signaling pathway.
  • The findings suggest DAB2IP is a promising therapeutic target for nasopharyngeal carcinoma (NPC).

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