Genome-wide CRISPR-Cas9 knockout library screening identified PTPMT1 in cardiolipin synthesis is crucial to survival in hypoxia in liver cancer.
Cell Rep
; 34(4): 108676, 2021 01 26.
Article
in En
| MEDLINE
| ID: mdl-33503428
ABSTRACT
Hypoxia, low oxygen (O2), is a key feature of all solid cancers, including hepatocellular carcinoma (HCC). Genome-wide CRISPR-Cas9 knockout library screening is used to identify reliable therapeutic targets responsible for hypoxic survival in HCC. We find that protein-tyrosine phosphatase mitochondrial 1 (PTPMT1), an important enzyme for cardiolipin (CL) synthesis, is the most significant gene and ranks just after hypoxia-inducible factor (HIF)-1α and HIF-1ß as crucial to hypoxic survival. CL constitutes the mitochondrial membrane and ensures the proper assembly of electron transport chain (ETC) complexes for efficient electron transfer in respiration. ETC becomes highly unstable during hypoxia. Knockout of PTPMT1 stops the maturation of CL and impairs the assembly of ETC complexes, leading to further electron leakage and ROS accumulation at ETC in hypoxia. Excitingly, HCC cells, especially under hypoxic conditions, show great sensitivity toward PTPMT1 inhibitor alexidine dihydrochloride (AD). This study unravels the protective roles of PTPMT1 in hypoxic survival and cancer development.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Cardiolipins
/
PTEN Phosphohydrolase
/
Liver Neoplasms
Type of study:
Diagnostic_studies
/
Prognostic_studies
/
Screening_studies
Limits:
Animals
/
Humans
/
Male
Language:
En
Journal:
Cell Rep
Year:
2021
Document type:
Article
Affiliation country:
Hong Kong