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. 1990 Aug 15;270(1):119-23.
doi: 10.1042/bj2700119.

Down's syndrome fibroblasts exhibit enhanced inositol uptake

B R Fruen  1 , B R Lester
Affiliations

Down's syndrome fibroblasts exhibit enhanced inositol uptake

B R Fruen et al. Biochem J. .

Abstract

The inositol metabolism of Down's syndrome (DS, trisomy 21) skin fibroblasts was examined. We report that DS cells accumulated [3H]inositol 2-3-fold faster than did other aneuploid or diploid controls. In contrast, trisomy 21 did not affect the uptake of choline, serine or glucose. Kinetic analysis demonstrated an increased maximal velocity of high-affinity, Na(+)-dependent, inositol transport, consistent with the expression of higher numbers of transporters by DS cells. Enhanced uptake was accompanied by a proportional increase in the incorporation of radiolabelled inositol into phospholipid. We suggest that an imbalance of inositol metabolism may contribute to plasma membrane abnormalities characteristic of DS cells.

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