| RRC ID |
89917
|
| 著者 |
Ayano Oi, Pattama Wiriyasermkul, Hiroto Hakamada, Ayako Isomura-Matoba, Miyu Kubota, Dooseon Cho, Osamu Nishimura, Yusuke Kato, Chisako Sakuma, Takefumi Kondo, Shushi Nagamori, Masayuki Miura, Fumiaki Obata
|
| タイトル |
A reabsorption mechanism in
Drosophila
renal tubules maintains amino acid homeostasis
|
| Abstract |
Summary
The kidney plays a central role in maintaining systemic homeostasis by regulating the excretion of metabolic compounds. In mammals, this is achieved through filtration followed by selective reabsorption, whereas insect Malpighian tubules (MTs) are thought to function primarily through active secretion. Although reabsorption of ions and water has been described in MTs, whether these tissues regulate metabolite balance through reabsorption remains unclear. Here, we uncover an amino acid (AA) reabsorption mechanism in
Drosophila
MTs. Quantification of AAs in excreta reveals that AA excretion changes rapidly and markedly in response to dietary protein levels, while systemic AA levels remain stable. Using
ex vivo
assays, we show that MTs actively transport AAs. We identify the AA transporter Slimfast (Slif), expressed in the lower tubule, as a key mediator required to maintain systemic levels of basic AAs. These findings reveal a previously unrecognised reabsorption-based strategy in insect renal tubules that functionally parallels mammalian kidney physiology, despite their distinct organisation. Our study demonstrates that AA excretion forms an additional layer to achieve metabolic homeostasis.
|
| DOI |
10.64898/2026.05.07.723391
|
| リソース情報 |
| ショウジョウバエ |
DGRC#119956 |
