The electrical properties of any tissue are intimately related to the maintenance of cellular volume. The electrical properties of the lens are conferred by four anatomical structures: the membranes of the anterior epithelium, the membranes of the lens' fibers, the gap junctions electrically connecting the lens' cells, and the tiny intercellular volume. We are using microelectrodes to perform frequency domain impedance studies of the lens under normal conditions and when subjected to bathing media of abnormal ionic composition or containing pharmacological agents. Impedance studies allow us to separately determine the electrical parameters describing each anatomical structure within the lens, thereby isolating the effect of each experimental intervention to the correct structure. In this way we hope to characterize a normal lens and understand how cellular volume is maintained. The same studies will then be performed on experimental models of cataracts and we hope to identify early changes that might lead to a loss of volume regulation in these lenses.
| Kumari, Sindhu; Gao, Junyuan; Mathias, Richard T et al. (2017) Aquaporin 0 Modulates Lens Gap Junctions in the Presence of Lens-Specific Beaded Filament Proteins. Invest Ophthalmol Vis Sci 58:6006-6019 |
| Gao, Junyuan; Sun, Xiurong; White, Thomas W et al. (2015) Feedback Regulation of Intracellular Hydrostatic Pressure in Surface Cells of the Lens. Biophys J 109:1830-9 |
| Liu, Ke; Lyu, Lei; Chin, David et al. (2015) Altered ubiquitin causes perturbed calcium homeostasis, hyperactivation of calpain, dysregulated differentiation, and cataract. Proc Natl Acad Sci U S A 112:1071-6 |
| Sindhu Kumari, S; Gupta, Neha; Shiels, Alan et al. (2015) Role of Aquaporin 0 in lens biomechanics. Biochem Biophys Res Commun 462:339-45 |
| Cheng, Catherine; Nowak, Roberta B; Gao, Junyuan et al. (2015) Lens ion homeostasis relies on the assembly and/or stability of large connexin 46 gap junction plaques on the broad sides of differentiating fiber cells. Am J Physiol Cell Physiol 308:C835-47 |
| Scheiblin, David A; Gao, Junyuan; Caplan, Jeffrey L et al. (2014) Beta-1 integrin is important for the structural maintenance and homeostasis of differentiating fiber cells. Int J Biochem Cell Biol 50:132-45 |
| Slavi, Nefeli; Rubinos, Clio; Li, Leping et al. (2014) Connexin 46 (cx46) gap junctions provide a pathway for the delivery of glutathione to the lens nucleus. J Biol Chem 289:32694-702 |
| Hall, James E; Mathias, Richard T (2014) The aquaporin zero puzzle. Biophys J 107:10-5 |
| Sellitto, Caterina; Li, Leping; Gao, Junyuan et al. (2013) AKT activation promotes PTEN hamartoma tumor syndrome-associated cataract development. J Clin Invest 123:5401-9 |
| Gao, Junyuan; Wang, Huan; Sun, Xiurong et al. (2013) The effects of age on lens transport. Invest Ophthalmol Vis Sci 54:7174-87 |
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