Abstract
1. 1. The regulation of epithelial cell volume is an essential requirement for normal tissue function and the maintenance of cellular integrity. 2. 2. Renal papillary epithelial cells utilize an organic to compensate for the shrinkage associated with exposure to hypertonic solutions. 3. 3. These cells synthesize the polyol, sorbitol, to increase their intracellular solute content. 4. 4. Sorbitol is synthesized from glucose by the enzyme aldose reductase; exposure of the cells to hypertonic media causes aldose reductase synthesis and subsequent sorbitol generation over a two or three day period. 5. 5. The intracellular signal for the formation of aldose reductase is not yet identified.
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