Pr Glaucoma is a neurodegenerative disease in which there is specific loss of retinal ganglion cells (RGCs). Current management is directed at lowering intraocular pressure (IOP), through the use of eye drops, laser treatment, and/or operative surgery. Although such treatment can be effective, sufficient IOP lowering cannot always be safely achieved, and sometime even with significant IOP lowering there still can be progression of optic nerve damage. In an effort to complement IOP-based therapy, efforts have been made to develop neuroprotective therapies that directly act to preserve RGC health and function. However, despite important laboratory advances, neuroprotection-based treatment approaches for glaucoma have not yet made it to the clinic. In order to help advance toward a clinically viable neuroprotective strategy, we have been pursuing a variety of approaches to identify novel drug targets and molecular pathways that could be used to promote RGC survival in glaucoma and other optic neuropathies. In a preliminary set of studies we have demonstrated the feasibility of performing an RNAi screen with primary cultures of murine RGCs to identify genes that modulate RGC survival. In this R21 application we propose to further optimize this technology, use it to perform a whole genome siRNA screen, and then validate the identified hits by testing their activity in vivo using an optic nerve crush model of optic nerve injury.

Public Health Relevance

Vision loss from glaucoma is caused by the death of retinal ganglion cells (RGCs), the nerve cells in the retina that carry vision from the eye to the brain. We are using RNA interference-based approaches to try to better understand the signals that trigger RGCs to die. This work will hopefully identify new drug targets that could be used to reduce or prevent RGC death and vision loss, and thereby lead to novel treatment strategies for glaucoma and other optic neuropathies.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Exploratory/Developmental Grants (R21)
Project #
5R21EY022769-02
Application #
8539490
Study Section
Special Emphasis Panel (DPVS)
Program Officer
Chin, Hemin R
Project Start
2012-09-01
Project End
2014-08-31
Budget Start
2013-09-01
Budget End
2014-08-31
Support Year
2
Fiscal Year
2013
Total Cost
$153,900
Indirect Cost
$58,900
Name
Johns Hopkins University
Department
Ophthalmology
Type
Schools of Medicine
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21218
Sluch, Valentin M; Zack, Donald J (2014) Stem cells, retinal ganglion cells and glaucoma. Dev Ophthalmol 53:111-21