Quantitative proteomic analysis unveils a critical role of VARS1 in hepatocellular carcinoma aggressiveness through the modulation of MAGI1 expression
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.This study reveals two hepatocellular carcinoma (HCC) proteomic subgroups, with aggressive forms linked to aminoacyl-tRNA synthetases (ARSs). Valine tRNA-aminoacyl synthetase (VARS1) drives HCC aggressiveness by downregulating tumor suppressor MAGI1.
Area Of Science
- Proteomics
- Cancer Biology
- Molecular Oncology
Background
- Genetic and transcriptomic signatures of hepatocellular carcinoma (HCC) are known, but proteomic characterization remains incomplete.
- This study addresses the need for a comprehensive proteomic understanding of HCC.
- Exploring proteomic alterations is crucial for identifying new therapeutic targets and understanding disease mechanisms.
Purpose Of The Study
- To perform non-targeted quantitative proteomics on HCC samples.
- To explore the clinical, functional, and molecular consequences of proteomic alterations in HCC.
- To identify novel prognostic biomarkers and therapeutic targets in HCC.
Main Methods
- Quantitative proteomics was performed on cytosolic and nuclear fractions of HCC and non-tumour adjacent tissues (n=42).
- Proteomic changes were validated in silico across seven HCC cohorts.
- Functional studies involved gene silencing/overexpression of VARS1 and MAGI1 in HCC cell lines and in vivo models.
Main Results
- Two distinct proteomic HCC subgroups were identified, with the more aggressive subgroup associated with dysregulated aminoacyl-tRNA synthetases (ARSs).
- Valine tRNA-aminoacyl synthetase (VARS1) was consistently overexpressed in aggressive HCC and linked to poor prognosis.
- VARS1 overexpression promoted aggressiveness by downregulating the tumor suppressor MAGI1, a key mediator of its function.
Conclusions
- Quantitative proteomics defines two HCC subgroups with prognostic implications.
- Dysregulation of ARSs machinery in aggressive HCC presents potential as prognostic biomarkers.
- VARS1 promotes HCC aggressiveness via MAGI1 modulation, highlighting a novel targetable vulnerability.
Contact us if these videos are not relevant.
Contact us if these videos are not relevant.
Related Concept Videos
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...