PRKN-mediated the ubiquitination of IQGAP3 regulates cell growth, metastasis and ferroptosis in early-onset colorectal cancer
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View abstract on PubMed
Summary
This summary is machine-generated.Parkin (PRKN) targets High IQ motif-containing GTPase activating protein 3 (IQGAP3) for degradation, inhibiting early-onset colorectal cancer (EOCRC) progression. PRKN
Area Of Science
- Oncology
- Molecular Biology
- Cancer Research
Background
- High IQ motif-containing GTPase activating protein 3 (IQGAP3) expression correlates with poor prognosis in colorectal cancer (CRC).
- The specific role of IQGAP3 in early-onset CRC (EOCRC) progression remains largely undefined.
- Understanding the molecular mechanisms driving EOCRC is crucial for developing targeted therapies.
Purpose Of The Study
- To investigate the functional role of IQGAP3 and its interaction with Parkin (PRKN) in the progression of EOCRC.
- To elucidate the regulatory mechanism of IQGAP3 by PRKN in EOCRC cells.
- To evaluate the therapeutic potential of targeting the PRKN-IQGAP3 axis in EOCRC.
Main Methods
- Quantitative real-time PCR (qRT-PCR) and Western blot to assess IQGAP3 and PRKN expression.
- Cellular assays including CCK8, EdU, flow cytometry, and Transwell assays to evaluate proliferation, apoptosis, and metastasis.
- Biochemical assays to measure reactive oxygen species (ROS), malondialdehyde (MDA), glutathione (GSH), Fe2+, ACSL4, and SLC7A11 levels to assess ferroptosis.
- Co-immunoprecipitation (Co-IP) and ubiquitination assays to determine the interaction and ubiquitination of IQGAP3 by PRKN.
- Xenograft tumor models in vivo to assess the impact of PRKN and IQGAP3 on tumorigenesis.
Main Results
- IQGAP3 was significantly upregulated, while PRKN was downregulated in EOCRC tissues and cells.
- IQGAP3 knockdown suppressed CRC cell proliferation, migration, and invasion, while enhancing apoptosis and ferroptosis.
- PRKN directly ubiquitinated IQGAP3, promoting its degradation and consequently inhibiting CRC cell growth, metastasis, and promoting ferroptosis.
- Overexpression of PRKN suppressed EOCRC progression, an effect reversed by increased IQGAP3 levels.
- In vivo studies confirmed that PRKN upregulation reduced CRC tumorigenesis by decreasing IQGAP3 expression.
Conclusions
- PRKN-mediated ubiquitination and degradation of IQGAP3 is a key mechanism suppressing EOCRC progression.
- The PRKN-IQGAP3 axis represents a novel therapeutic target for EOCRC treatment.
- Targeting IQGAP3 degradation via PRKN activation could offer a promising strategy for managing EOCRC.
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