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AJP - Renal Physiology, Vol 270, Issue 3 548-F553, Copyright © 1996 by American Physiological Society
ARTICLES |
T. Katsura, D. A. Ausiello and D. Brown
Renal Unit, Massachusetts General Hospital, USA.
Vasopressin-dependent membrane insertion of aquaporin-2 (AQP-2) in collecting duct principal cells has been demonstrated in vivo and in vitro. However, the hypothesis that the AQP-2 molecule recycles between intracellular vesicles and the plasma membrane in response to hormonal stimulation and withdrawal remains to be demonstrated directly. In the present study, we examined AQP-2 recycling between intracellular vesicles and the plasma membrane in the absence of de novo protein synthesis using LLC-PK1 cells transfected with an AQP-2-c-myc construct. Cells were treated with cycloheximide for 30 min prior to vasopressin stimulation, and all subsequent treatments were performed in the continued presence of cycloheximide. Complete inhibition of AQP-2 biosynthesis by cycloheximide was verified by immuno-precipitation. Immunofluorescence revealed that AQP-2 was located on intracellular vesicles in nonstimulated cells but was relocated to the plasma membrane after vasopressin treatment, even in the presence of cycloheximide. After vasopressin washout, AQP-2 was retrieved to intracellular vesicles and was relocated to the plasma membrane after restimulation with forskolin. Subsequent forskolin washout resulted in AQP-2 endocytosis, and a second stimulation with forskolin resulted in relocation to the plasma membrane. These data, obtained in the absence of de novo protein synthesis, clearly indicate that AQP-2 can be recycled multiple times between intracellular vesicles and the plasma membrane.
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