Abstract
A study of the increase of leucocyte alkaline phosphatase (LAP) activity following oral anhydroxyprogesterone or intramuscular prednisolone was carried out in a group of Down's syndrome subjects and paired controls. The increase in LAP activity was greater in the Down's syndrome patients at p < .025 with anhydroxyprogestrone and at p < .005 with prednisolone. Simultaneous assays were carried out in another group of patients for LAP and the X chromosome-linked enzyme glucose 6-phosphate dehydrogenase (G6PDH). The increase in LAP activity was greater in Down's syndrome but the increase in G6PDH activity was similar in the two groups. Several possible reasons for the greater increase in LAP activity following the steroids were discussed. The authors favor the view that the increase is related to greater rates of synthesis of the enzyme in Down's syndrome and to trisomy for chromosome 21.
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