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Journal of Cancer Research and Clinical Oncology

, Volume 139, Issue 7, pp 1129–1139 | Cite as

Protein tyrosine phosphatase kappa (PTPRK) is a negative regulator of adhesion and invasion of breast cancer cells, and associates with poor prognosis of breast cancer

  • Ping-Hui SunEmail author
  • Lin Ye
  • Malcolm D. Mason
  • Wen G. Jiang
Original Paper

Abstract

Purpose

Receptor-like protein tyrosine phosphatase kappa (PTPRK) has been shown to exhibit homophilic binding. It is a putative tumour suppressor in primary central nervous system lymphomas and colorectal cancer. The present study investigated the expression of PTPRK in breast cancer and the biological impact of PTPRK on breast cancer cells.

Methods

Expression of PTPRK protein and gene transcript was examined in a cohort of breast cancer patients. The association of PTPRK transcript level and pathological and clinical aspects was then analysed. Knockdown of PTPRK in breast cancer cells was performed using a specific anti-PTPRK transgene. The impact of PTPRK knockdown on breast cancer cells was investigated using in vitro cell function assays.

Results

Lower levels of PTPRK transcripts were seen in the advanced breast cancer. The reduced PTPRK transcript levels were associated with poor prognosis of the disease. PTPRK transcript levels were decreased in the primary tumours of patients who died from breast cancer or had metastases. Patients with lower expression of PTPRK had shorter survival compared with those higher expression levels of PTPRK. Knockdown of PTPRK resulted in increased proliferation, adhesion, invasion, and migration of breast cancer cells in vitro.

Conclusions

Decreased expression of PTPRK in breast cancer is correlated with poor prognosis. PTPRK is a negative regulator of adhesion, invasion, migration, and proliferation of breast cancer cells. This suggests that PTPRK is a potential tumour suppressor in breast cancer.

Keywords

PTPRK Breast cancer Prognosis 

Abbreviations

Akt

RAC-alpha serine/threonine-protein kinase

CAM

Cell adhesion molecule

EGFR

Epidermal growth factor receptor

ERK

Extracellular signal regulated kinase

JNK

c-Jun N-terminal kinase

NPI

Nottingham Prognostic Index

NFκB

Nuclear factor kappa B

PI3K

Phosphoinositide 3-kinase

PKC

Protein kinase C

PLCγ1

Phospholipase Cγ1

PTK

Protein tyrosine kinase

PTP

Protein tyrosine phosphatase

RPTP

Receptor-like protein tyrosine phosphatase

Notes

Acknowledgments

The authors would thank the support from Cancer Research Wales and Breast Cancer Hope Foundation.

Conflict of interest

The authors declare that they have no competing interests.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Ping-Hui Sun
    • 1
    Email author
  • Lin Ye
    • 1
  • Malcolm D. Mason
    • 1
  • Wen G. Jiang
    • 1
  1. 1.Metastasis and Angiogenesis Research Group, Institute of Cancer and GeneticsCardiff University School of MedicineCardiffUK

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