Abstract
Caveolin-1 (Cav1), the core structural and scaffolding protein of caveolae membrane domains, is highly expressed in many retinal cells and is associated with ocular diseases. Cav1 regulates innate immune responses and is implicated in neuroinflammatory and neuroprotective signaling in the retina. We have shown that Cav1 expression in Müller glia accounts for over 70% of all retinal Cav1 expression. However, the proteins interacting with Cav1 in Müller glia are not established. Here, we show that immortalized MIO-M1 Müller glia, like endogenous Müller glia, highly express Cav1. Surprisingly, we found that Cav1 in MIO-M1 cells exists as heat-resistant, high molecular weight complexes that are stable after immunoprecipitation (IP). Mass spectrometric analysis of high molecular weight Cav1 complexes after Cav1 IP revealed an interactome network of intermediate filament, desmosomes, and actin-, and microtubule-based cytoskeleton. These results suggest Cav1 domains in Müller glia act as a scaffolding nexus for the cytoskeleton.
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Acknowledgments
This work was supported by NIH Grants R01EY019494 (MHE) and NEI Core Grant P30EY021725, by Presbyterian Health Foundation Research Scholar Award to Eric Enyong, and by an unrestricted grant to the OUHSC Department of Ophthalmology from Research to Prevent Blindness, Inc. Virginie Sjoelund was supported in part by the National Institute of General Medical Sciences of the National Institutes of Health under award number P20GM103447. We thank the Laboratory for Molecular Biology and Cytometry Research at OUHSC for the use of the Core Facility, which provided the proteomics services.
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Enyong, E.N., Gurley, J., Sjoelung, V., Elliott, M.H. (2023). Caveolin-1 in Müller Glia Exists as Heat-Resistant, High Molecular Weight Complexes. In: Ash, J.D., Pierce, E., Anderson, R.E., Bowes Rickman, C., Hollyfield, J.G., Grimm, C. (eds) Retinal Degenerative Diseases XIX. Advances in Experimental Medicine and Biology, vol 1415. Springer, Cham. https://doi.org/10.1007/978-3-031-27681-1_36
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DOI: https://doi.org/10.1007/978-3-031-27681-1_36
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