The general purpose of this proposal is to provide the principle investigator (PI) with the experience and skills necessary to become a successful and independent vision researcher. My long-term goal is to develop an independent research program directed toward discovery of treatments for glaucoma. Glaucoma is an age-related optic neuropathy that results in the death of retinal ganglion cells (RGCs) within the optic nerve. In this application, we propose to test whether ligands for a novel target, the molecular chaperone protein sigma receptor 1(?R1), can protect RGCs from death under conditions of glaucomatous stress. Several models of glaucoma have implicated tumor necrosis factor (TNF?) as a stressor that causes RGC death in glaucoma. We will use in vitro and in vivo model systems to test the hypothesis that ?R1 protects RGCs by suppressing retinal glial cell release of TNF? and by altering the signaling response of RGCs to TNF?. We will use a recently discovered rodent model for inducing increased intraocular pressure and knockout mouse technology to test our hypothesis.The following three aims will be addressed: 1) Test the hypothesis that ?R1 ligands modulate glial inflammatory responses using in vitro model systems. 2) Test the hypothesis that ?R1 activation shifts the balance of TNF? mediated signaling towards survival within RGCs. 3) Test the hypothesis that ?R1 activation alters glial and neuronal responses to ocular hypertension and that ?R1 ligand will suppress glial activation and protect against RGC death in an in vivo model of glaucoma.

Public Health Relevance

Glaucoma is the second leading cause of blindness worldwide. Because of the aging population, approximately 80 million people will be afflicted with this disease by the year 2020. A major risk factor for glaucoma is increased intraocular pressure (IOP), and this is currently the only modifiable risk factor. However, treatments that lower IOP can cause vision-threatening complications. In addition, studies indicate that progression of optic nerve degeneration continues in as many as 50% of patients treated with standard IOP-lowering therapy. Therefore, new neuroprotective targets for preventing glaucomatous vision loss are needed. This proposal tests a novel target for glaucoma treatment.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Clinical Investigator Award (CIA) (K08)
Project #
5K08EY021758-05
Application #
8877544
Study Section
Special Emphasis Panel (ZEY1)
Program Officer
Agarwal, Neeraj
Project Start
2011-08-01
Project End
2017-04-30
Budget Start
2015-08-01
Budget End
2017-04-30
Support Year
5
Fiscal Year
2015
Total Cost
Indirect Cost
Name
Georgia Regents University
Department
Ophthalmology
Type
Schools of Medicine
DUNS #
City
Augusta
State
GA
Country
United States
Zip Code
30912
Mysona, Barbara A; Zhao, Jing; Smith, Sylvia et al. (2018) Relationship between Sigma-1 receptor and BDNF in the visual system. Exp Eye Res 167:25-30
Smith, Sylvia B; Wang, Jing; Cui, Xuezhi et al. (2018) Sigma 1 receptor: A novel therapeutic target in retinal disease. Prog Retin Eye Res 67:130-149
Mysona, B A; Zhao, J; Bollinger, K E (2017) Role of BDNF/TrkB pathway in the visual system: Therapeutic implications for glaucoma. Expert Rev Ophthalmol 12:69-81
Zhao, Jing; Mysona, Barbara A; Qureshi, Azam et al. (2016) (+)-Pentazocine Reduces NMDA-Induced Murine Retinal Ganglion Cell Death Through a ?R1-Dependent Mechanism. Invest Ophthalmol Vis Sci 57:453-61
Shanmugam, Arul K; Mysona, Barbara A; Wang, Jing et al. (2016) Progesterone Receptor Membrane Component 1 (PGRMC1) Expression in Murine Retina. Curr Eye Res 41:1105-1112
Zhao, Jing; Ha, Yonju; Liou, Gregory I et al. (2014) Sigma receptor ligand, (+)-pentazocine, suppresses inflammatory responses of retinal microglia. Invest Ophthalmol Vis Sci 55:3375-84