胞饮病
细胞外
谷氨酰胺
细胞生物学
化学
内吞循环
癌细胞
生物化学
细胞内
内吞作用
生物
细胞
氨基酸
癌症
遗传学
作者
Cosimo Commisso,Shawn M. Davidson,Rengin G. Soydaner-Azeloglu,Seth J. Parker,Jurre J. Kamphorst,Sean R. Hackett,Elda Grabocka,Michel Nofal,Jeffrey A. Drebin,Craig B. Thompson,Joshua D. Rabinowitz,Christian M. Metallo,Matthew G. Vander Heiden,Dafna Bar‐Sagi
出处
期刊:Nature
[Springer Nature]
日期:2013-05-10
卷期号:497 (7451): 633-637
被引量:1401
摘要
Macropinocytosis is a highly conserved endocytic process by which extracellular fluid and its contents are internalized into cells through large, heterogeneous vesicles known as macropinosomes. Oncogenic Ras proteins have been shown to stimulate macropinocytosis but the functional contribution of this uptake mechanism to the transformed phenotype remains unknown. Here we show that Ras-transformed cells use macropinocytosis to transport extracellular protein into the cell. The internalized protein undergoes proteolytic degradation, yielding amino acids including glutamine that can enter central carbon metabolism. Accordingly, the dependence of Ras-transformed cells on free extracellular glutamine for growth can be suppressed by the macropinocytic uptake of protein. Consistent with macropinocytosis representing an important route of nutrient uptake in tumours, its pharmacological inhibition compromises the growth of Ras-transformed pancreatic tumour xenografts. These results identify macropinocytosis as a mechanism by which cancer cells support their unique metabolic needs and point to the possible exploitation of this process in the design of anticancer therapies.
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