Reduces a broad range of aliphatic and aromatic aldehydes to the corresponding alcohols. Reduces prostaglandins (PubMed:19010934). May play a role in the metabolism of xenobiotic aromatic aldehydes (By similarity). an alditol + NADP(+) = an aldose + H(+) + NADPH NADP(+) + prostaglandin F2alpha = H(+) + NADPH + prostaglandin H2 Monomer. Expressed exclusively in the epithelial cells of the deferent duct. Castration resulted in a marked decrease in the level of the mRNA coding for the protein, whereas administration of testosterone to castrated males resulted in a marked increase. Belongs to the aldo/keto reductase family.