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Yeast As a Chassis for Developing Functional Assays to Study Human P53
Published on: August 4, 2019
LIF is a new p53 negative regulator.
Juan Liu1, Haiyang Yu1, Wenwei Hu1
1Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers, State University of New Jersey, New Brunswick, NJ, USA.
Leukemia inhibitory factor (LIF) negatively regulates the tumor suppressor p53 in colorectal cancer by activating Stat3 and ID1, promoting chemoresistance. LIF overexpression correlates with poor prognosis in cancer patients.
Area of Science:
- Oncology
- Molecular Biology
- Cell Signaling
Background:
- Leukemia inhibitory factor (LIF) is an interleukin-6 family cytokine with diverse biological roles.
- The tumor suppressor protein p53 is critical in preventing cancer development.
- Dysregulation of p53 is a common event in human cancers, including colorectal cancer.
Purpose of the Study:
- To investigate the role of LIF as a regulator of p53 in human colorectal cancer.
- To elucidate the molecular mechanisms by which LIF affects p53.
- To determine the clinical significance of LIF in colorectal cancer prognosis.
Main Methods:
- Western blotting and quantitative PCR to assess protein and mRNA levels.
- Cell culture and xenograft models to study chemoresistance.
- Immunohistochemistry to analyze LIF expression in patient specimens.
Main Results:
- LIF negatively regulates p53 protein levels and function via Stat3/ID1 pathway activation.
- ID1 induction by LIF leads to increased MDM2 expression and p53 degradation.
- LIF overexpression enhances chemoresistance in colorectal cancer cells and xenografts, dependent on p53.
- Elevated LIF levels in human colorectal tumors associate with poor patient prognosis.
Conclusions:
- LIF acts as a novel negative regulator of p53 in colorectal cancer.
- The LIF/Stat3/ID1/MDM2/p53 axis represents a new mechanism in colorectal cancer development.
- LIF overexpression is a potential biomarker for poor prognosis in colorectal cancer patients.
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