EGFR Signaling Stimulates Autophagy to Regulate Stem Cell Maintenance and Lipid Homeostasis in the Drosophila Testis.
Cell Rep
; 30(4): 1101-1116.e5, 2020 01 28.
Article
em En
| MEDLINE
| ID: mdl-31995752
ABSTRACT
Although typically upregulated upon cellular stress, autophagy can also be utilized under homeostatic conditions as a quality control mechanism or in response to developmental cues. Here, we report that autophagy is required for the maintenance of somatic cyst stem cells (CySCs) in the Drosophila testis. Disruption of autophagy in CySCs and early cyst cells (CCs) by the depletion of autophagy-related (Atg) genes reduced early CC numbers and affected CC function, resembling decreased epidermal growth factor receptor (EGFR) signaling. Indeed, our data indicate that EGFR acts to stimulate autophagy to preserve early CC function, whereas target of rapamycin (TOR) negatively regulates autophagy in the differentiating CCs. Finally, we show that the EGFR-mediated stimulation of autophagy regulates lipid levels in CySCs and CCs. These results demonstrate a key role for autophagy in regulating somatic stem cell behavior and tissue homeostasis by integrating cues from both the EGFR and TOR signaling pathways to control lipid metabolism.
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Base de dados:
MEDLINE
Assunto principal:
Autofagia
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Células-Tronco
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Receptores de Peptídeos de Invertebrados
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Proteínas de Drosophila
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Drosophila
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Metabolismo dos Lipídeos
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Receptores ErbB
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Células Germinativas
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article