tokens: METHODS/RESULTS : Cells exposed to high D-glucose ( 30 mmol/l ) caused an increase in [ 3H ] -thymidine incorporation and cell numbers at 24 and 48 h and normalized at 72 h ( p < 0.05 ) , whereas these changes were not found in high mannitol ( 30 mmol/l ) , IL-1 beta , or TNF alpha -stimulated mesangial cells .