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Vacuolar protein sorting 4B, an ATPase protein positively regulates the progression of NSCLC via promoting cell division

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Abstract

Vacuolar protein sorting 4B (VPS4B), a member of ATPase family proteins, plays a crucial role in lysosome-dependent degradation. Recently, it was found that VPS4B could negatively regulate breast cancer progression through promoting lysosomal-dependent degradation for EGFR. Nevertheless, other studies found that VPS4B was also essential for cell division and mitosis through insuring the maintenance of centrosome and spindle assembly. Thus, the role of VPS4B in cancer biology remains under debate. In this study, we analyzed the clinical significance of VPS4B in NSCLC. The expression of VPS4B was evaluated by Western blot in 8 paired fresh NSCLC tissues and immunohistochemistry on 105 paraffin-embedded slices. VPS4B was highly expressed in NSCLC and significantly associated with NSCLCs tumor size, histological differentiation, clinical stage and Ki-67. Besides, high VPS4B expression was an independent prognostic factor for NSCLC patients’ poor survival. To determine whether VPS4B could regulate the proliferation of NSCLC cells, we knocked down the expression of VPS4B and analyzed the proliferation of A549 NSCLC cells using Western blot, CCK8 and flow cytometry assays, which together indicated that loss of VPS4B could inhibit cell cycle progress. These data suggest that VPS4B may promote the progression of NSCLC and be a biotarget for NSCLCs therapy.

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Acknowledgments

This work was supported by the Natural Science Foundation of China (No. 81272708).

Conflict of interest

We declare no conflict of interest.

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Authors and Affiliations

  1. Department of Pathology, Affiliated Hospital of Nantong University, 19 Qixiu Road, Nantong, 226001, Jiangsu, China

    Yifei Liu & Chunhua Wan

  2. Department of Oncology, Affiliated Hospital of Nantong University, 19 Qixiu Road, Nantong, 226001, Jiangsu, China

    Liting Lv, Tingting Ni, Buyou Chen & Guoxin Mao

  3. Department of Thoracic Surgery, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China

    Qun Xue & Yiqun Zhou

  4. Department of Gastroenterology, Affiliated Hospital of Nantong University, 19 Qixiu Road, Nantong, 226001, Jiangsu, China

    Yanhua Liu & Runzhou Ni

Authors
  1. Yifei Liu
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  2. Liting Lv
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  3. Qun Xue
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  4. Chunhua Wan
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  5. Tingting Ni
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  6. Buyou Chen
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  7. Yanhua Liu
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  8. Yiqun Zhou
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  9. Runzhou Ni
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  10. Guoxin Mao
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Corresponding authors

Correspondence to Runzhou Ni or Guoxin Mao.

Additional information

Yifei Liu and Liting Lv contributed equally to this study.

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Liu, Y., Lv, L., Xue, Q. et al. Vacuolar protein sorting 4B, an ATPase protein positively regulates the progression of NSCLC via promoting cell division. Mol Cell Biochem 381, 163–171 (2013). https://doi.org/10.1007/s11010-013-1699-2

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  • DOI: https://doi.org/10.1007/s11010-013-1699-2

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