The retinal pigment epithelium (RPE) is a multifunctional and indispensable component of the vertebrate retina. The convoluted apical and basal plasma membranes of RPE cells provide a large surface area that allows rapid material exchange between these cells and their local microenvironment. The RPE is considered to be the primary lesion site of age-related macular degeneration (AMD), a disease that has pathology spanning the entire photoreceptor-RPE-choriocapillaris complex. The root cause of the initial damage to the RPE remains unclear. Because the RPE cells have an active transport role, we propose that a decline in membrane trafficking is sufficient to cause numerous adverse effects on membrane specialization, protein trafficking, and/or secretion. These effects could be conveyed to neighboring cells through direct cell-cell interaction and/or diffusion. Chloride intracellular channel 4 (CLIC4), an apical RPE protein, has an important role in vesicular exocytosis in other epithelial cell types. To study the physiological relevance of CLIC4, we have developed two novel rodent models in which CLIC4 can be selectively suppressed from RPE cells in situ (i.e., in vivo transfection, and conditional knockout mice). In both of these model systems, young adults manifest several cell autonomous and non-cell autonomous features that not only mirror each other, but also mimic the hallmarks of AMD. To build upon these findings, we will conduct a comprehensive characterization of these animals to better model the disease progression of AMD (Aim 1). Furthermore, we will directly test our model that the dysregulated vesicular trafficking function of CLIC4 is what causes the microvillar dysmorphogenesis and retinal detachment in the mutant animals (Aim 2). Finally, we will test the hypothesis that CLIC4 is important for the secretion of molecules produced by RPE cells (Aim 3). Imbalanced secretion may lead to atrophy in the adjacent tissues. Several innovative techniques, cell cultures, and state-of-the-art animal models will be used in combination to address these inter-related questions. These studies will enrich our fundamental understanding of the RPE and ultimately lead to better diagnosis of early AMD and rational design of treatments.

Public Health Relevance

RPE has been proposed to be the primary lesion site for several ocular disorders including AMD. AMD has a high prevalence and is a leading cause of blindness in the elderly. Our proposed study of structure and function of RPE is important to elucidate the etiology and disease progression of AMD, and to lay the groundwork for future therapies.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY016805-08
Application #
8607949
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
Neuhold, Lisa
Project Start
2005-08-01
Project End
2016-01-31
Budget Start
2014-02-01
Budget End
2015-01-31
Support Year
8
Fiscal Year
2014
Total Cost
Indirect Cost
Name
Weill Medical College of Cornell University
Department
Ophthalmology
Type
Schools of Medicine
DUNS #
City
New York
State
NY
Country
United States
Zip Code
10065
Wahl, Silke; Magupalli, Venkat Giri; Dembla, Mayur et al. (2016) The Disease Protein Tulp1 Is Essential for Periactive Zone Endocytosis in Photoreceptor Ribbon Synapses. J Neurosci 36:2473-93
Mestres, Iván; Chuang, Jen-Zen; Calegari, Federico et al. (2016) SARA regulates neuronal migration during neocortical development through L1 trafficking. Development 143:3143-53
Chou, Szu-Yi; Hsu, Kuo-Shun; Otsu, Wataru et al. (2016) CLIC4 regulates apical exocytosis and renal tube luminogenesis through retromer- and actin-mediated endocytic trafficking. Nat Commun 7:10412
Hsu, Ya-Chu; Chuang, Jen-Zen; Sung, Ching-Hwa (2015) Light regulates the ciliary protein transport and outer segment disc renewal of mammalian photoreceptors. Dev Cell 32:731-42
Thuenauer, Roland; Hsu, Ya-Chu; Carvajal-Gonzalez, Jose Maria et al. (2014) Four-dimensional live imaging of apical biosynthetic trafficking reveals a post-Golgi sorting role of apical endosomal intermediates. Proc Natl Acad Sci U S A 111:4127-32
Yeh, Celine; Li, Aiqun; Chuang, Jen-Zen et al. (2013) IGF-1 activates a cilium-localized noncanonical Gβγ signaling pathway that regulates cell-cycle progression. Dev Cell 26:358-68
Sung, Ching-Hwa; Leroux, Michel R (2013) The roles of evolutionarily conserved functional modules in cilia-related trafficking. Nat Cell Biol 15:1387-97
Pearson, R A; Barber, A C; Rizzi, M et al. (2012) Restoration of vision after transplantation of photoreceptors. Nature 485:99-103
Sung, Ching-Hwa; Li, Aiqun (2011) Ciliary resorption modulates G1 length and cell cycle progression. Cell Cycle 10:2825-6
He, Guoan; Ma, Yao; Chou, Szu-Yi et al. (2011) Role of CLIC4 in the host innate responses to bacterial lipopolysaccharide. Eur J Immunol 41:1221-30

Showing the most recent 10 out of 13 publications