Related Experiment Video
Updated: Sep 17, 2025
Author Spotlight: Tracing the Ferroptotic Signatures and Cell Death Dynamics in Medulloblastoma for Advanced Therapeutics
Published on: March 15, 2024
OTUB1 promotes colorectal cancer progression by stabilizing GPX4 and inhibiting ferroptosis
Guofeng Lin1,2, Xi Lin2, Qihuang Lin2
1School of Clinical Medicine, Fujian Medical University, Fuzhou, Fujian, China.
Background:
Therapeutic resistance in colorectal cancer (CRC) is frequently linked to dysregulated protein homeostasis, which enables tumor cells to evade cell death. The ubiquitin-proteasome system (UPS) plays a pivotal role in regulating protein stability and has been implicated in ferroptosis, an iron-dependent form of cell death driven by lipid peroxidation. Otubain1 (OTUB1), a deubiquitinase within the UPS, is hypothesized to regulate ferroptosis by stabilizing GPX4, a key inhibitor of ferroptosis.
Aim:
This study investigates the regulatory role of OTUB1 in ferroptosis through its interaction with GPX4, aiming to uncover a novel therapeutic axis for CRC.
Methods:
OTUB1 expression was manipulated in CRC cells using siRNA-mediated knockdown and plasmid-based overexpression. GPX4 expression, ROS levels, lipid peroxidation, and cell viability were assessed using qRT-PCR, Western blotting, and functional assays. Co-immunoprecipitation (Co-IP) assay was performed to confirm the interaction between OTUB1 and GPX4.
Results:
OTUB1 knockdown led to a significant reduction in GPX4 protein levels, leading to elevated ROS, increased lipid peroxidation, and decreased cell viability. Conversely, GPX4 overexpression in OTUB1-knockdown cells restored cell viability and reversed ferroptosis markers (P < 0.01). Co-IP assay confirmed that OTUB1 interacted with GPX4 and prevented its ubiquitin-mediated degradation, thereby stabilizing GPX4.
Conclusion:
This study identifies OTUB1 as a novel regulator of ferroptosis in CRC through the stabilization of GPX4. Targeting the OTUB1-GPX4 axis may provide a new therapeutic approach for inducing ferroptosis in CRC cells, potentially overcoming resistance to conventional therapies and improving patient outcomes.
Insights
Otubain1 (OTUB1) stabilizes GPX4, a key protein in ferroptosis, in colorectal cancer (CRC) cells. Targeting this OTUB1-GPX4 interaction offers a new therapeutic strategy to overcome CRC resistance.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Death Mechanisms
Background:
- Therapeutic resistance in colorectal cancer (CRC) is linked to protein homeostasis dysregulation, allowing tumor cells to evade death.
- The ubiquitin-proteasome system (UPS) regulates protein stability and is involved in ferroptosis, an iron-dependent cell death.
- Otubain1 (OTUB1), a deubiquitinase, is hypothesized to control ferroptosis by stabilizing GPX4, a ferroptosis inhibitor.
Purpose of the Study:
- Investigate OTUB1's role in ferroptosis via GPX4 interaction.
- Identify a novel therapeutic target for colorectal cancer.
Main Methods:
- Manipulated OTUB1 expression in CRC cells (siRNA, overexpression).
- Assessed GPX4 levels, reactive oxygen species (ROS), lipid peroxidation, and cell viability.
- Confirmed OTUB1-GPX4 interaction using co-immunoprecipitation (Co-IP).
Main Results:
- OTUB1 knockdown reduced GPX4 protein, increasing ROS, lipid peroxidation, and decreasing cell viability.
- GPX4 overexpression in OTUB1-knockdown cells restored viability and reversed ferroptosis markers.
- Co-IP confirmed OTUB1 stabilizes GPX4 by preventing its degradation.
Conclusions:
- OTUB1 is a novel regulator of ferroptosis in CRC by stabilizing GPX4.
- Targeting the OTUB1-GPX4 axis presents a new therapeutic strategy for CRC.
- This approach may overcome resistance and improve patient outcomes.
Related Concept Videos
01:33Pleiotropy
01:33Cancer-Critical Genes I: Proto-oncogenes
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
01:20The Retinoblastoma Gene
The first-ever tumor suppressor gene called Rb was identified in retinoblastoma - a rare eye tumor in children. In inherited forms of the disease, a child inherits one defective copy of the Rb gene, which predisposes them to retinoblastoma. However,...
03:03mTOR Signaling and Cancer Progression
The mTOR pathway or the...
01:12Loss of Tumor Suppressor Gene Functions
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
01:16TGF - β Signaling Pathway