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Membrane Trafficking of Aquaporin 1 Is Mediated by Protein Kinase C via Microtubules and Regulated by Tonicity

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posted on 2010-02-09, 00:00 authored by Matthew T. Conner, Alex C. Conner, James E. P. Brown, Roslyn M. Bill
It is well-known that the rapid flow of water into and out of cells is controlled by membrane proteins called aquaporins (AQPs). However, the mechanisms that allow cells to quickly respond to a changing osmotic environment are less well established. Using GFP−AQP fusion proteins expressed in HEK293 cells, we demonstrate the reversible manipulation of cellular trafficking of AQP1. AQP1 trafficking was mediated by the tonicity of the cell environment in a specific PKC- and microtubule-dependent manner. This suggests that the increased level of water transport following osmotic change may be due a phosphorylation-dependent increase in the level of AQP1 trafficking resulting in membrane localization.

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