Protein tyrosine phosphatase 1B regulates migration of ARPE-19 cells through EGFR/ERK signaling pathway
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Department of Ophthalmology, Affiliated Hospital of Qingdao University, Qingdao 266003, Shandong Province, China

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Supported by Shandong Provincial Natural Science Foundation, China (No.ZR2012HQ004); the Research Fund for Fundamental Research Project of Qingdao (No.13-1-4-180-jch); the Scientific Research Fund of Huangdao District of Qingdao City (No.2014-1-74); the Young People Scientific Research Fund of Affiliated Hospital, Qingdao University (No.QDFY134).

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    Abstract:

    AIM: To evaluate whether protein tyrosine phosphatase 1B (PTP1B) contributed to initiate human retinal pigment epithelium cells (A)-19 migration and investigate the signaling pathways involved in this process. METHODS:ARPE-19 cells were cultured and treated with the siRNA-PTP1B. Expression of PTP1B was confirmed by quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR). AG1478 [a selective inhibitor of epidermal growth factor receptor (EGFR)] and PD98059 (a specific inhibitor of the activation of mitogen-activated protein kinase) were used to help to determine the PTP1B signaling mechanism. Western blot analysis verified expression of EGFR and extracellular signal-regulated kinase (ERK) in ARPE-19 cells. The effect of siRNA-PTP1B on cell differentiation was confirmed by immunostaining for α-smooth muscle actin (α-SMA) and qRT-PCR. Cell migration ability was analyzed by transwell chamber assay.RESULTS: The mRNA levels of PTP1B were reduced by siRNA-PTP1B as determined by qRT-PCR assay. SiRNA-PTP1B activated EGFR and ERK phosphorylation. α-SMA staining and qRT-PCR assay demonstrated that siRNA-PTP1B induced retinal pigment epithelium (RPE) cells to differentiate toward better contractility and motility. Transwell chamber assay proved that PTP1B inhibition improved migration activity of RPE cells. Treatment with AG1478 and PD98059 abolished siRNA-PTP1B-induced activation of EGFR and ERK, α-SMA expression and cell migration.CONCLUSION: PTP1B inhibition promoted myofibroblast differentiation and migration of ARPE-19 cells, and EGFR/ERK signaling pathway played important role in migration process.

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Zhao-Dong Du, Li-Ting Hu, Gui-Qiu Zhao, et al. Protein tyrosine phosphatase 1B regulates migration of ARPE-19 cells through EGFR/ERK signaling pathway. Int J Ophthalmol, 2015,8(5):891-897

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Publication History
  • Received:June 12,2014
  • Revised:March 03,2015
  • Adopted:March 03,2015
  • Online: October 09,2015
  • Published: