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Tryptophan regulates Drosophila zinc stores

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...

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Detalles Bibliográficos
Autores principales: Garay, Erika, Schuth, Nils, Barbanente, Alessandra, Tejeda-Guzmán, Carlos, Vitone, Daniele, Osorio, Beatriz, Clark, Adam H., Nachtegaal, Maarten, Haumann, Michael, Dau, Holger, Vela, Alberto, Arnesano, Fabio, Quintanar, Liliana, Missirlis, Fanis
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9169789/
https://www.ncbi.nlm.nih.gov/pubmed/35412912
http://dx.doi.org/10.1073/pnas.2117807119
Descripción
Sumario: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.