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File: /var/www/html/application/controllers/Detail.php
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Tryptophan regulates zinc stores. | LitMetric
Zinc deficiency is commonly attributed to inadequate absorption of the metal. Instead, we show that body zinc stores in Drosophila melanogaster depend on tryptophan consumption. Hence, a dietary amino acid regulates zinc status of the whole insect—a finding consistent with the widespread requirement of zinc as a protein cofactor. Specifically, the tryptophan metabolite kynurenine is released from insect fat bodies and induces the formation of zinc storage granules in Malpighian tubules, where 3-hydroxykynurenine and xanthurenic acid act as endogenous zinc chelators. Kynurenine functions as a peripheral zinc-regulating hormone and is converted into a 3-hydroxykynurenine–zinc–chloride complex, precipitating within the storage granules. Thus, zinc and the kynurenine pathway—well-known modulators of immunity, blood pressure, aging, and neurodegeneration—are physiologically connected.
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