D-aspartate regulates melanocortin formation and function: behavioral alterations in D-aspartate oxidase-deficient mice

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Alex S HuangSolomon H Snyder

Abstract

D-aspartate, an abundant D-amino acid enriched in neuroendocrine tissues, can be degraded by D-aspartate oxidase (Ddo). To elucidate the function of D-aspartate, we generated mice with targeted deletion of Ddo (Ddo(-/-)) and observe massive but selective augmentations of D-aspartate in various tissues. The pituitary intermediate lobe, normally devoid of D-aspartate from endogenous Ddo expression, manifests pronounced increases of immunoreactive D-aspartate in Ddo(-/-) mice. Ddo(-/-) mice show markedly diminished synthesis and levels of pituitary proopiomelanocortin/alpha-MSH, associated with decreased melanocortin-dependent behaviors. Therefore, Ddo is the endogenous enzyme that degrades D-aspartate, and Ddo-enriched organs, low in D-aspartate, may represent areas of high turnover where D-aspartate may be physiologically important.

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