Swelling and membrane potential dynamics of glial Müller cells

Khmelinskii, Igor; Makarov, Vladimir

http://hdl.handle.net/10400.1/18816

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Authors

Khmelinskii, Igor

Makarov, Vladimir

Abstract(s)

Presently a detailed biophysical model describing reversible and irreversible swelling dynamics of Muller cells (MC) is reported. The model includes a biophysical block of ionic and neutral species transport via MC mem-brane, water transport induced by osmotic pressure and pressure generated by membrane deformations, MC membrane potential and membrane mechanical properties. The model describes reversible and irreversible MC swelling (MCS) using the same set of parameters. The model was used in fitting available experimental data, and produced numerical values of previously unknown model parameters, including those describing mechanical properties of Muller cell membrane (MCM) with respect to bending and stretching. Numerical experiments simulating MC swelling showed complex oscillation dynamics of the relevant parameters in physiological initial conditions. In particular, MC membrane potential (ATMC) demonstrated complex oscillation dynamics, which may be described by a superposition of several oscillations with their periods in the milliseconds, 100-ms and seconds time ranges. Dynamics of reversible and irreversible MCS, and the transition criteria from reversible to irreversible MCS modes were determined in model simulations.