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1 Laboratory of Kidney and Electrolyte Metabolism and 3 Hematology Branch, National Heart, Lung, and Blood Institute, Bethesda, Maryland 20892-1603; and 2 Department of Cell Biology, Georgetown University Medical Center, Washington, District of Columbia 20007
We investigated the effects of hyperosmolality on survival and proliferation of subconfluent cultures of mIMCD3 mouse renal collecting duct cells. High NaCl and/or urea (but not glycerol) reduces the number of viable cells, as measured with 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT). Raising osmolality from a normal level (300 mosmol/kg) to 550-1,000 mosmol/kg by adding NaCl and/or urea greatly increases the proportion of cells in the G2M phase of the cell cycle within 8 h, as measured by flow cytometry. Up to 600 mosmol/kg the effect is only transient, and by 12 h at 550 mosmol/kg the effect reverses and most cells are in G1. Flow cytometry with 5-bromodeoxyuridine (BrdU) pulse-chase demonstrates that movement through the S phase of the cell cycle slows, depending on the concentrations of NaCl and/or urea, and that the duration of G2M increases greatly (from 2.5 h at 300 mosmol/kg to more than 16 h at the higher osmolalities). Addition of NaCl and/or urea to total osmolality of 550 mosmol/kg or more also induces apoptosis, as demonstrated by characteristic electron microscopic morphological changes, appearance of a subdiploid peak in flow cytometry, and caspase-3 activation. The number of cells with subdiploid DNA and activated caspase-3 peaks at 8-12 h. Caspase-3 activation occurs in all phases of the cell cycle, but to a disproportionate degree in G0/G1 and S phases. We conclude that elevated NaCl and/or urea reduces the number of proliferating mIMCD3 cells by slowing the transit through the S phase, by cell cycle delay in the G2M and G1, and by inducing apoptotic cell death.
osmolality; G2 arrest; cell proliferation; cell death
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