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Abstract
The specific activity of ketohexokinase (EC 2.7.1.3), initiating the fructose utilization of lenses, depends upon age. In whole bovine lenses, this activity was found to be at a maximum at an age of about 9 months and, after subsequent decrease, the activity shows no further changes after an age of about 3 years. The highest activity at all ages investigated was found in the lens quator, with regional activities decreasing therefrom in the order: anterior cortex, posterior cortex and nucleus. The age dependency of ketohexokinase activity in the different lens parts differs from that of the whole lens. During ageing, there is an increase in specific activity in the equator; anterior and posterior cortex show almost constant values and the activity of the lens nucleus steadily decreases. The importance of these findings is discussed with respect to the age-induced changes in the lens carbohydrate metabolism.
Published Version
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