期刊
NATURE CHEMICAL BIOLOGY
卷 11, 期 10, 页码 799-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEMBIO.1889
关键词
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资金
- Academy of Finland [273533, 266092, 131489, 263841, 272130]
- Liv och Halsa Foundation
- University of Helsinki Research Fund Grant
- Ruth and Nils-Erik Stenback Foundation
- Finnish Medical Foundation
- Sigrid Juselius Foundation
- Magnus Ehrnrooth Foundation
- Perklen Foundation
- Swiss National Science Foundation
- NCCR Chemical Biology
- SystemsX.ch
- Academy of Finland (AKA) [131489, 272130, 273533, 263841, 266092, 131489, 263841, 266092, 272130, 273533] Funding Source: Academy of Finland (AKA)
Lysosome-associated protein transmembrane-4b (LAPTM4B) associates with poor prognosis in several cancers, but its physiological function is not well understood. Here we use novel ceramide probes to provide evidence that LAPTM4B interacts with ceramide and facilitates its removal from late endosomal organelles (LEs). This lowers LE ceramide in parallel with and independent of acid ceramidase-dependent catabolism. In LAPTM4B-silenced cells, LE sphingolipid accumulation is accompanied by lysosomal membrane destabilization. However, these cells resist ceramide-driven caspase-3 activation and apoptosis induced by chemotherapeutic agents or gene silencing. Conversely, LAPTM4B overexpression reduces LE ceramide and stabilizes lysosomes but sensitizes to drug-induced caspase-3 activation. Together, these data uncover a cellular ceramide export route from LEs and identify LAPTM4B as its regulator. By compartmentalizing ceramide, LAPTM4B controls key sphingolipid-mediated cell death mechanisms and emerges as a candidate for sphingolipid-targeting cancer therapies.
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