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J Biol Chem, Vol. 274, Issue 46, 32875-32880, November 12, 1999
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From Mouse vas deferens protein (MVDP) is an aldose
reductase-like protein that is highly expressed in the vas deferens and
adrenal glands and whose physiological functions were unknown. We
hereby describe the enzymatic characteristics of MVDP and its role in murine adrenocortical Y1 cells. The murine aldose reductase (AR) and
MVDP cDNAs were expressed in bacteria to obtain recombinant proteins and to compare their enzymatic activities. Recombinant MVDP
was functional and displayed kinetic properties distinct from those of
murine AR toward various substrates, a preference for NADH, and
insensitivity to AR inhibitors. For MVDP, isocaproaldehyde, a product
of side-chain cleavage of cholesterol generated during steroidogenesis,
is the best natural substrate identified so far. In Y1 cells, we found
that NADH-linked isocaproaldehyde reductase (ICR) activity was much
higher than NADPH-linked ICR activity and was not abolished by AR
inhibitors. We demonstrate that in Y1 cells, forskolin-induced MVDP
expression enhanced NADH-linked ICR activity by 5-6-fold, whereas no
variation in ICR-linked NADPH activity was observed in the same
experiment. In cells stably transfected with MVDP antisense cDNA,
NADH-linked ICR activity was abolished even in the presence of
forskolin, and the isocaproaldehyde toxicity was increased compared
with that of intact Y1 cells, as measured by isocaproaldehyde
LD50. In Y1 cells transfected with MVDP antisense
cDNA, forskolin-induced toxicity was abolished by
aminoglutethimide. These results indicate that in adrenocortical cells,
MVDP is responsible for detoxifying isocaproaldehyde generated by steroidogenesis.
UMR CNRS 6547, Université Blaise Pascal,
Les Cézeaux, 63177 Aubière, Cedex, France and
¶ URA31 CNRS, Université Louis Pasteur,
67000 Strasbourg, France
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