The pervasiveness of macropinocytosis in oncological malignancies.
Philos Trans R Soc Lond B Biol Sci
; 374(1765): 20180153, 2019 02 04.
Article
in En
| MEDLINE
| ID: mdl-30967003
ABSTRACT
In tumour cells, macropinocytosis functions as an amino acid supply route and supports cancer cell survival and proliferation. Initially demonstrated in oncogenic KRAS-driven models of pancreatic cancer, macropinocytosis triggers the internalization of extracellular proteins via discrete endocytic vesicles called macropinosomes. The incoming protein cargo is targeted for lysosome-dependent degradation, causing the intracellular release of amino acids. These protein-derived amino acids support metabolic fitness by contributing to the intracellular amino acid pools, as well as to the biosynthesis of central carbon metabolites. In this way, macropinocytosis represents a novel amino acid supply route that tumour cells use to survive the nutrient-poor conditions of the tumour microenvironment. Macropinocytosis has also emerged as an entry mechanism for a variety of nanomedicines, suggesting that macropinocytosis regulation in the tumour setting can be harnessed for the delivery of anti-cancer therapeutics. A slew of recent studies point to the possibility that macropinocytosis is a pervasive feature of many different tumour types. In this review, we focus on the role of this important uptake mechanism in a variety of cancers and highlight the main molecular drivers of macropinocytosis in these malignancies. This article is part of the Theo Murphy meeting issue 'Macropinocytosis'.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Pinocytosis
/
Tumor Microenvironment
/
Neoplasms
Limits:
Humans
Language:
En
Journal:
Philos Trans R Soc Lond B Biol Sci
Year:
2019
Type:
Article
Affiliation country:
United States