Table 3.

Activities of Selected Enzymes of Glucose and Glutamate Metabolism in Cultured Human Glia

	Subcellular Fraction
Enzyme	Cytosol	Mitochondria
G3PDH	1.60 ± 0.25	—
Hexokinase	0.04 ± 0.01	—
LDH	1.30 ± 0.20	—
G6PDH	0.03 ± 0.01	—
Malate dehydrogenase	0.44 ± 0.08	0.22 ± 0.07
Aspartate aminotransaminase	0.04 ± 0.01	0.03 ± 0.01
Glutamate dehydrogenase	ND	0.07 ± 0.02
GS	ND	—

Activities expressed as micromoles per minute per milligram protein; means ± SD. Each value is average of at least three experiments with triplicate culture dishes per experiment. ND, not detected.