Effect of Age and Diet on Delta-Aminolevulinic Acid Dehydratase in Red Blood Cells

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Abstract
ALA-D activity measured in the red blood cells of different species show considerable variations. Among the adult animals, rabbits have the highest activity and dogs, the lowest. It is a zinc-dependent enzyme and its activity is related to the age of the animals as well as the availability of zinc in the diet during the early growth period. Rats at partus have the highest ALA-D activity ever registered in any animal species and it decreases drastically during the early growth period. The red blood cells of newborn human babies have 50% higher ALA-D activity than that of adult man. When rats during their early growth period are fed on a diet containing 0.08 mmol zinc, there was a reduction in the enzyme activity whereas adult rats fed on diets containing higher and lower amounts of zinc did not show any change.

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