EGFR-Pak Signaling Selectively Regulates Glutamine Deprivation-Induced Macropinocytosis.
Dev Cell
; 50(3): 381-392.e5, 2019 08 05.
Article
em En
| MEDLINE
| ID: mdl-31257175
ABSTRACT
Macropinocytosis has emerged as an important nutrient-scavenging pathway that supports tumor cell fitness. By internalizing extracellular protein and targeting it for lysosomal degradation, this endocytic pathway functions as an amino acid supply route, permitting tumor cell growth and survival despite the nutrient-poor conditions of the tumor microenvironment. Here, we provide evidence that a subset of pancreatic ductal adenocarcinoma (PDAC) tumors are wired to integrate contextual metabolic inputs to regulate macropinocytosis, dialing up or down this uptake pathway depending on nutrient availability. We find that regional depletion of amino acids coincides with increased levels of macropinocytosis and that the scarcity of glutamine uniquely drives this process. Mechanistically, this stimulation of macropinocytosis depends on the nutrient stress-induced potentiation of epidermal growth factor receptor signaling that, through the activation of Pak, controls the extent of macropinocytosis in these cells. These results provide a mechanistic understanding of how nutritional cues can control protein scavenging in PDAC tumors.
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Base de dados:
MEDLINE
Assunto principal:
Neoplasias Pancreáticas
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Pinocitose
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Transdução de Sinais
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Carcinoma Ductal Pancreático
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Quinases Ativadas por p21
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Receptores ErbB
Limite:
Animals
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Female
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Humans
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article