Transport and metabolism of glucose by dissociated brain cells: effects of trypsin.

A study was carried out to determine the effect of trypsin on glucose transport into brain cells. Two suspensions of dissociated cells were prepared from the two brain hemispheres of adult rats--one using only mechanical means to dissociate the cells and one using trypsin. The use of trypsin for preparation of dissociated brain cells caused a marked reduction in the rate of transport of [1,2-3H]-2-deoxy-D-glucose compared to uptakes of this glucose analog by cells prepared without trypsin. Responses of the two cell preparations to inhibitors of glucose transport (cytochalasin B and phloretin) were similar. Rates of oxidation of [6-14C]glucose to 14CO2 by trypsin-treated cells were nearly double those in cells prepared without trypsin. Electron microscopic examination of the two preparations revealed much less preservation of structural integrity if trypsin was used to prepare the cells. The findings suggest that trypsin alters cell structure and affects receptor-regulated events in brain cells.