Omics · study · 2026
CHTOP Regulates ROS Homeostasis to Modulate Chemoresistance in Colorectal Cancer
Listed in NCBI GEO
Chemotherapy resistance remains a significant challenge in colorectal cancer (CRC) treatment, with disrupted reactive oxygen species (ROS) homeostasis playing a central role.
Description
We identify CHTOP as a key regulator of ROS levels and chemoresistance in CRC. Mechanistically, CHTOP regulates ROS homeostasis by interacting with Nrf2 and modulating its SUMOylation via the SENP3-containing 5FMC complex.
Notably, CHTOP expression is tightly controlled by a ROS-dependent feedback loop. The PSIP1/p52 isoform inhibits CHTOP expression by disrupting HNRNPH1-dependent splicing, leading to CHTOP degradation via nonsense-mediated decay (NMD). Meanwhile, ROS accumulation stabilizes SENP3, promoting the deSUMOylation and degradation of p52, thereby forming a ROS-SENP3-p52-CHTOP feedback loop.
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Thus, ROS levels both regulate and are regulated by CHTOP, maintaining redox balance. CHTOP downregulation in 5-FU-resistant CRC shifts cells into a higher-ROS steady state, which correlates with reduced 5-FU sensitivity. Both restoring CHTOP expression and inducing further depletion of CHTOP disrupt redox balance in 5-FU-resistant cells, reversing resistance and re-establishing sensitivity.
These findings suggest that modulating CHTOP expression may offer a promising therapeutic strategy to overcome chemoresistance in CRC through redox regulation.
Links
Get the data
- GEO FTP directory ftp.ncbi.nlm.nih.gov/geo/series/GSE313nnn/GSE313017 ↗
download · from NCBI GEO
Where it is published
- GEO accession page ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE313017 ↗
landing page · from NCBI GEO
Documentation and papers
- PRJNA1378121 ncbi.nlm.nih.gov/bioproject/PRJNA1378121 ↗
project · from NCBI GEO
- PubMed 42617575 pubmed.ncbi.nlm.nih.gov/42617575 ↗
publication · from NCBI GEO
Topics
- Stated by source
- Expression profiling by high throughput sequencing · Homo sapiens
- From keywords
- Life Sciences
- Inferred from text
- Cancer 75%
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NCBI GEO | GSE313017 | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NCBI GEO | connector:ncbi_geo@1.0.0 | |
| concepts[disease].local:disease:cancer | enrichment · NCBI GEO | keyword-concept-rules@1.0.0 | title+description (75%) |
| concepts[field].local:field:life-sciences | mapping · NCBI GEO | connector:ncbi_geo@1.0.0 | |
| concepts[method].geo_series_type:expression-profiling-by-high-throughput-sequencing | source · NCBI GEO | connector:ncbi_geo@1.0.0 | /gdstype |
| concepts[organism].NCBITaxon:9606 | source · NCBI GEO | connector:ncbi_geo@1.0.0 | /taxon |
| description | source · NCBI GEO | connector:ncbi_geo@1.0.0 | /summary |
| publication_date | source · NCBI GEO | connector:ncbi_geo@1.0.0 | |
| title | source · NCBI GEO | connector:ncbi_geo@1.0.0 | /title |