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DUSP5 and DUSP6 modulate corneal epithelial cell proliferation.

Zheng Wang1, Peter S Reinach, Fan Zhang

  • 1Department of Biological Sciences, SUNY State College of Optometry, New York, NY, USA.

Molecular Vision
|September 1, 2010
PubMed
Summary
This summary is machine-generated.

Dual specificity phosphatases (DUSPs) regulate corneal epithelial cell proliferation. DUSP5 and DUSP6 control ERK pathway activity, while DUSP1

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Ophthalmology

Background:

  • Dual specificity phosphatases (DUSPs) are key regulators of mitogen-activated protein kinase (MAPK) cascades, controlling the duration and magnitude of terminal kinase (TK) phospho-activation.
  • Overexpression of DUSP1, DUSP5, and DUSP6 has been observed in ocular surface side population stem cells (SPSCs).

Purpose of the Study:

  • To investigate the impact of DUSP1, DUSP5, and DUSP6 on TK phosphorylation and corneal epithelial cell proliferation.
  • To elucidate the specific roles of DUSP1, DUSP5, and DUSP6 in regulating MAPK signaling pathways in the cornea.

Main Methods:

  • Human corneal epithelial cells (immortalized and fresh) were transduced with lentivectors to express shRNA against DUSP1, DUSP5, and JNK1, or to overexpress DUSP6.
  • Terminal kinase (TK) phosphorylation status and cell proliferation rates were assessed using immunoblotting and (3)H thymidine uptake assays.

Main Results:

  • DUSP1 knockdown maintained high TK phosphorylation and proliferation rates, attributed to a simultaneous pJNK1/2 antiproliferative effect.
  • DUSP5 knockdown prevented DUSP5 protein increase, leading to sustained Erk1/2 phosphorylation and a 50%-60% increase in proliferation.
  • DUSP6 overexpression prevented Erk1/2 phosphorylation and reduced proliferation to less than 50%.

Conclusions:

  • DUSP5 and DUSP6 exhibit selective control over ERK pathway activity and corneal epithelial cell proliferation.
  • DUSP1's lack of effect on proliferation is due to its broad MAPK influence, balancing pro- and anti-proliferative signals.
  • Targeting DUSP5 and DUSP6 may offer therapeutic strategies for corneal epithelial cell regulation.