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AY 9944 dihydrochloride is a selective inhibitor of Δ7-sterol reductase with IC50 value of 13 nM [1].

Δ7-sterol reductase (Dhcr7) is an enzyme and plays an important role in catalyzing the production of cholesterol from 7-Dehydrocholesterol through using NADPH [2, 3].

AY 9944 dihydrochloride is a potentΔ7-sterol reductase inhibitor and has higher inhibition thanΔ7-sterol reductase inhibitor BM15766 and triparanol. When tested with Saccharomyces cerevisiae expressed cDNA without an N-terminal 9E10 c-myc epitope (mycD7-ORF) and 5’ noncoding region (D7-ORF), AY 9944 dihydrochloride exhibited highly inhibition on D7-ORF (recombinant humanΔ7-sterol reductase ) with IC50 value of 13 nM [1]. In PBMCs isolated from AIDS patients, AY 9944 treatment exhibited ability to restore the normal mitogenic responses and cytokine profiles [2].

In Sprague-Dawley rats model of Smith-Lemli-Opitz syndrome, administration of AY9944 elevated 7-DHC expression and reduced cholesterol in all biological tissues by inhibitingΔ7-sterol reductase [3].

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