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In the Central Nervous System (CNS), Aquaporin-4 (AQP4) is reported to be functionally coupled with the calcium-channel Transient-Receptor Potential Vanilloid member-4 (TRPV4), which is controversially involved in cell volume regulation mechanisms and water transport dynamics. The present work aims to investigate the selective role of TRPV4 in regulating plasma membrane water permeability in an AQP4-independent way. Fluorescence-quenching water transport experiments in Aqp4-/- astrocytes revealed that cell swelling rate is significantly increased upon TRPV4 activation and in the absence of AQP4. The biophysical properties of TRPV4-dependent water transport were therefore assessed using the HEK-293 cell model. Calcein quenching experiments showed that chemical and thermal activation of TRPV4 overexpressed in HEK-293 cells leads to faster swelling kinetics. Stopped-flow light scattering water transport assay was used to measure the osmotic permeability coefficient (Pf, cm/s) and activation energy (Ea, kcal/mol) conferred by TRPV4. Results provided evidence that although the Pf measured upon TRPV4 activation is lower than the one obtained in AQP4-overexpressing cells (Pf of AQP4 = 0.01667 & PLUSMN; 0.0007; Pf of TRPV4 = 0.002261 & PLUSMN; 0.0004; Pf of TRPV4 + 4 & alpha;PDD = 0.007985 & PLUSMN; 0.0006; Pf of WT = 0.002249 & PLUSMN; 0.0002), along with activation energy values (Ea of AQP4 = 0.86 & PLUSMN; 0.0006; Ea of TRPV4 + 4 & alpha;PDD = 2.73 & PLUSMN; 1.9; Ea of WT = 8.532 & PLUSMN; 0.4), these parameters were compatible with a facilitated pathway for water movement rather than simple diffusion. The possibility to tune plasma membrane water permeability more finely through TRPV4 might represent a protective mechanism in cells constantly facing severe osmotic challenges to avoid the potential deleterious effects of the rapid cell swelling occurring via AQP channels.Model for the intracellular calcium modulation of plasma membrane water permeability in cells under hypotonic conditions. (A) Slow lipid-mediated permeation of water molecules through cellular plasma membrane (lowest Pf and highest Ea values). (B) Rapid water transport following intracellular calcium increase upon TRPV4 activation or ER-store depletion in the presence of thapsigargin. Calcium might putatively act on 1. intrinsic biophysical properties of the lipid bilayer (i.e., fluidity; thickness; viscosity) or 2. calcium-dependent transmembrane proteins able to co-transport water molecules together with solutes (intermediate values of Pf and Ea). 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