J 2022

Reduced ER–mitochondria connectivity promotes neuroblastoma multidrug resistance

COKU, Jorida, David M BOOTH, Jan ŠKODA, Madison C PEDROTTY, Jennifer VOGEL et. al.

Basic information

Original name

Reduced ER–mitochondria connectivity promotes neuroblastoma multidrug resistance

Authors

COKU, Jorida, David M BOOTH, Jan ŠKODA (203 Czech Republic, belonging to the institution), Madison C PEDROTTY, Jennifer VOGEL, Kangning LIU, Annette VU, Erica L CARPENTER, Jamie C YE, Michelle A CHEN, Peter DUNBAR, Elizabeth SCADDEN, Taekyung D YUN, Eiko NAKAMARU-OGISO, Estela AREA-GOMEZ, Yimei LI, Kelly C GOLDSMITH, C Patrick REYNOLDS, Gyorgy HAJNOCZKY and Michael D HOGARTY (guarantor)

Edition

EMBO Journal, Hoboken, Wiley, 2022, 0261-4189

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

30204 Oncology

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 11.400

RIV identification code

RIV/00216224:14310/22:00125550

Organization unit

Faculty of Science

UT WoS

000760798100001

Keywords in English

ceramides; inter-organelle contacts; mitochondria-associated membranes; multidrug resistance; sphingolipids

Tags

Tags

International impact, Reviewed
Změněno: 3/6/2022 13:45, Mgr. Marie Šípková, DiS.

Abstract

V originále

Most cancer deaths result from progression of therapy resistant disease, yet our understanding of this phenotype is limited. Cancer therapies generate stress signals that act upon mitochondria to initiate apoptosis. Mitochondria isolated from neuroblastoma cells were exposed to tBid or Bim, death effectors activated by therapeutic stress. Multidrug-resistant tumor cells obtained from children at relapse had markedly attenuated Bak and Bax oligomerization and cytochrome c release (surrogates for apoptotic commitment) in comparison with patient-matched tumor cells obtained at diagnosis. Electron microscopy identified reduced ER-mitochondria-associated membranes (MAMs; ER-mitochondria contacts, ERMCs) in therapy-resistant cells, and genetically or biochemically reducing MAMs in therapy-sensitive tumors phenocopied resistance. MAMs serve as platforms to transfer Ca2+ and bioactive lipids to mitochondria. Reduced Ca2+ transfer was found in some but not all resistant cells, and inhibiting transfer did not attenuate apoptotic signaling. In contrast, reduced ceramide synthesis and transfer was common to resistant cells and its inhibition induced stress resistance. We identify ER-mitochondria-associated membranes as physiologic regulators of apoptosis via ceramide transfer and uncover a previously unrecognized mechanism for cancer multidrug resistance.

Links

GJ20-00987Y, research and development project
Name: Mitochondriální dynamika a autofagie: Chybějící článek mezi dediferenciací a vznikem rezistence u solidních nádorů dětského věku
Investor: Czech Science Foundation