Hepatocyte growth factor receptor in human RPE cells: implications in proliferative vitreoretinopathy

Area of Science:

• Ophthalmology
• Cell Biology
• Molecular Biology

Background:

• Retinal pigment epithelial (RPE) cells play crucial roles in retinal health.
• The function of hepatocyte growth factor (HGF) and its receptor (HGFR) in RPE cells is not fully understood.
• Investigating HGFR expression in RPE cells and epiretinal membranes is important for understanding RPE-related diseases.

Purpose of the Study:

• To determine if HGFR is expressed in RPE cells and if these cells respond to HGF.
• To examine HGFR expression in human donor eyes and epiretinal membranes associated with proliferative vitreoretinopathy (PVR) and idiopathic epiretinal membranes.

Main Methods:

• Assessed HGF-dependent migration and proliferation of RPE cells using Boyden chamber and [3H]thymidine uptake assays.
• Evaluated HGFR expression and tyrosine phosphorylation in RPE cells via immunoprecipitation and western blot.
• Analyzed HGFR expression in human donor eyes and epiretinal membranes using immunohistochemistry.

Main Results:

• HGFR was expressed in RPE cells and tyrosine-phosphorylated upon HGF stimulation.
• HGF acted as a potent motogen for RPE cells, with a modest effect on proliferation.
• Strong HGFR expression was observed in the RPE monolayer and in epiretinal membranes from PVR patients, but not in idiopathic epiretinal membranes.

Conclusions:

• HGFR is present in cultured RPE cells, the RPE monolayer, and epiretinal membranes in PVR.
• HGF is a significant chemoattractant for RPE cells.
• These findings indicate a potential role for HGF and HGFR in RPE cell function and PVR pathogenesis.