A Genome-Wide CRISPR Screen Identifies Sortilin as the Receptor Responsible for Galectin-1 Lysosomal Trafficking.
bioRxiv
; 2024 Jan 03.
Article
em En
| MEDLINE
| ID: mdl-38260508
ABSTRACT
Galectins are a family of mammalian glycan-binding proteins that have been implicated as regulators of myriad cellular processes including cell migration, apoptosis, and immune modulation. Several members of this family, such as galectin-1, exhibit both cell-surface and intracellular functions. Interestingly, galectin-1 can be found in the endomembrane system, nucleus, or cytosol, as well as on the cell surface. The mechanisms by which galectin-1 traffics between cellular compartments, including its unconventional secretion and internalization processes, are poorly understood. Here, we determined the pathways by which exogenous galectin-1 enters cells and explored its capacity as a delivery vehicle for protein and siRNA therapeutics. We used a galectin-1-toxin conjugate, modelled on antibody-drug conjugates, as a selection tool in a genome-wide CRISPR screen. We discovered that galectin-1 interacts with the endosome-lysosome trafficking receptor sortilin in a glycan-dependent manner, which regulates galectin-1 trafficking to the lysosome. Further, we show that this pathway can be exploited for delivery of a functional siRNA. This study sheds light on the mechanisms by which galectin-1 is internalized by cells and suggests a new strategy for intracellular drug delivery via galectin-1 conjugation.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
BioRxiv
Ano de publicação:
2024
Tipo de documento:
Article