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Tumor Biology

, Volume 34, Issue 5, pp 2891–2897 | Cite as

Overexpression of CRKL correlates with malignant cell proliferation in breast cancer

  • Tingting Zhao
  • Zhifeng Miao
  • Zhenning Wang
  • Yingying Xu
  • Jianhua Wu
  • Xingyu Liu
  • Yi You
  • Jiguang Li
Research Article

Abstract

Crk-like (CRKL) is an adapter protein that has crucial roles in multiple biological processes, including cell proliferation, adhesion, and migration. However, the expression pattern of CRKL protein and its clinical significance in human breast cancers have not been well characterized. In this study, expression of CRKL was evaluated in 108 human invasive ductal carcinoma (IDC) tissues by immunohistochemistry. CRKL protein was upregulated in the cancer tissues compared with adjacent normal mammary glands. Overexpression of CRKL was found in 40 of 108 (37.03 %) breast cancer samples and correlated with advanced p-tumor–node–metastasis stage (p = 0.002), nodal metastasis (p = 0.0323), and tumor size (p = 0.0075). In addition, overexpression of CRKL in the MDA-MB-435 cell line promoted cell proliferation, and small interfering RNA knockdown of CRKL in the MDA-MB-453 cell line inhibited proliferation. Further analysis of cell cycle-related molecules showed that CRKL induced cyclin D1 and phosphorylated extracellular signal-regulated kinase expression. In conclusion, this study demonstrated that overexpression of CRKL correlated with progression and malignant proliferation of human breast cancers.

Keywords

CRKL Immunohistochemistry Breast cancer Cyclin D1 

Notes

Conflicts of interest

No potential conflicts of interest were disclosed.

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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2013

Authors and Affiliations

  • Tingting Zhao
    • 1
  • Zhifeng Miao
    • 1
  • Zhenning Wang
    • 1
  • Yingying Xu
    • 1
  • Jianhua Wu
    • 1
  • Xingyu Liu
    • 1
  • Yi You
    • 1
  • Jiguang Li
    • 1
  1. 1.Department of Surgical Oncology and General SurgeryFirst Affiliated Hospital of China Medical UniversityShenyang CityChina

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