Tatsuo Itakura1, Andrew Webster1, Shravan K Chintala1, Yuchen Wang2, Jose M Gonzalez3, J C Tan3, Janice A Vranka4, Ted Acott4, Cheryl Mae Craft5,6, Maria E Sibug Saber7, Shinwu Jeong8, W Daniel Stamer9, Kirill A Martemyanov2, M Elizabeth Fini1. 1. 1 USC Institute for Genetic Medicine, Keck School of Medicine of USC, University of Southern California, Los Angeles, California. 2. 2 Department of Neuroscience, The Scripps Research Institute, Jupiter, Florida. 3. 3 Doheny Eye Institute and Department of Ophthalmology, University of California Los Angeles, Los Angeles, California. 4. 4 Casey Eye Institute, Oregon Health and Science University, Portland, Oregon. 5. 5 USC Roski Eye Institute, Department of Ophthalmology, Keck School of Medicine of USC, University of Southern California, Los Angeles, California. 6. 6 Department of Integrative Anatomical Sciences, Keck School of Medicine of USC, University of Southern California, Los Angeles, California. 7. 7 Department of Pathology, Keck School of Medicine of USC, University of Southern California, Los Angeles, California. 8. 8 USC Institute for Genetic Medicine, Department of Ophthalmology, USC Roski Eye Institute, Keck School of Medicine of USC, University of Southern California, Los Angeles, California. 9. 9 Department of Ophthalmology, Duke University, Durham, North Carolina.
Abstract
Purpose: GPR158 is a newly characterized family C G-protein-coupled receptor, previously identified in functional screens linked with biological stress, including one for susceptibility to ocular hypertension/glaucoma induced by glucocorticoid stress hormones. In this study, we investigated GPR158 function in the visual system. Methods: Gene expression and protein immunolocalization analyses were performed in mouse and human brain and eye to identify tissues where GPR158 might function. Gene expression was perturbed in mice, and in cultures of human trabecular meshwork cells of the aqueous outflow pathway, to investigate function and mechanism. Results: GPR158 is highly expressed in the brain, and in this study, we show prominent expression specifically in the visual center of the cerebral cortex. Expression was also observed in the eye, including photoreceptors, ganglion cells, and trabecular meshwork. Protein was also localized to the outer plexiform layer of the neural retina. Gpr158 deficiency in knockout (KO) mice conferred short-term protection against the intraocular pressure increase that occurred with aging, but this was reversed over time. Most strikingly, the pressure lowering effect of the acute stress hormone, epinephrine, was negated in KO mice. In contrast, no disruption of the electroretinogram was observed. Gene overexpression in cell cultures enhanced cAMP production in response to epinephrine, suggesting a mechanism for intraocular pressure regulation. Overexpression also increased survival of cells subjected to oxidative stress linked to ocular hypertension, associated with TP53 pathway activation. Conclusions: These findings implicate GPR158 as a homeostatic regulator of intraocular pressure and suggest GPR158 could be a pharmacological target for managing ocular hypertension.
Purpose: GPR158 is a newly characterized family C G-protein-coupled receptor, previously identified in functional screens linked with biological stress, including one for susceptibility to ocular hypertension/glaucoma induced by glucocorticoid stress hormones. In this study, we investigated GPR158 function in the visual system. Methods: Gene expression and protein immunolocalization analyses were performed in mouse and human brain and eye to identify tissues where GPR158 might function. Gene expression was perturbed in mice, and in cultures of human trabecular meshwork cells of the aqueous outflow pathway, to investigate function and mechanism. Results:GPR158 is highly expressed in the brain, and in this study, we show prominent expression specifically in the visual center of the cerebral cortex. Expression was also observed in the eye, including photoreceptors, ganglion cells, and trabecular meshwork. Protein was also localized to the outer plexiform layer of the neural retina. Gpr158deficiency in knockout (KO) mice conferred short-term protection against the intraocular pressure increase that occurred with aging, but this was reversed over time. Most strikingly, the pressure lowering effect of the acute stress hormone, epinephrine, was negated in KO mice. In contrast, no disruption of the electroretinogram was observed. Gene overexpression in cell cultures enhanced cAMP production in response to epinephrine, suggesting a mechanism for intraocular pressure regulation. Overexpression also increased survival of cells subjected to oxidative stress linked to ocular hypertension, associated with TP53 pathway activation. Conclusions: These findings implicate GPR158 as a homeostatic regulator of intraocular pressure and suggest GPR158 could be a pharmacological target for managing ocular hypertension.
Authors: Felipe A Medeiros; Robert N Weinreb; Pamela A Sample; Cintia F Gomi; Christopher Bowd; Jonathan G Crowston; Linda M Zangwill Journal: Arch Ophthalmol Date: 2005-10
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