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MIF Facilitates Resistance to Androgen Deprivation Therapy by Regulating AMPD2 Expression in Prostate Cancer Cells
Changying Li1,2,3, Chenchen He4, Jiancheng Pan1
1The Second Hospital of Tianjin Medical University, Tianjin, China.
Objective:
Androgen deprivation therapy (ADT) was the frontline treatment for patients with prostate cancer ineligible for radical prostatectomy. However, the development of resistance to ADT significantly limits its clinical efficacy.
Methods:
Using a genome-wide CRISPR/Cas9 knockout (GeCKO) library screen combined with single-cell RNA sequencing (scRNA-seq) analysis, we identified key genes involved in ADT resistance.
Results:
Macrophage migration inhibitory factor (MIF) was identified as a critical mediator of ADT resistance. Inhibition of MIF significantly overcomes ADT resistance. Moreover, we found that the androgen receptor (AR), but not its splice variant AR-V7, negatively regulates MIF expression. Consequently, inhibition of the AR signaling pathway via ADT results in the upregulation of MIF expression. Elevated expression of MIF promotes prostate cancer cell proliferation by upregulating AMPD2 expression.
Conclusions:
Our findings demonstrate that ADT induces MIF upregulation, which in turn drives prostate cancer cell proliferation via upregulating AMPD2 expression, eventually contributing to the development of resistance to ADT.
Insights
Androgen deprivation therapy (ADT) resistance in prostate cancer is driven by increased Macrophage migration inhibitory factor (MIF). Inhibiting MIF overcomes resistance, offering a new therapeutic strategy for advanced prostate cancer.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Androgen deprivation therapy (ADT) is a primary treatment for advanced prostate cancer.
- Resistance to ADT significantly limits treatment effectiveness and patient outcomes.
Purpose of the Study:
- To identify key genes mediating resistance to ADT in prostate cancer.
- To elucidate the molecular mechanisms underlying ADT resistance.
Main Methods:
- Genome-wide CRISPR/Cas9 knockout (GeCKO) library screening.
- Single-cell RNA sequencing (scRNA-seq) for gene identification.
- Functional assays to validate gene targets.
Main Results:
- Macrophage migration inhibitory factor (MIF) was identified as a critical mediator of ADT resistance.
- Inhibition of MIF effectively overcomes ADT resistance in preclinical models.
- Androgen receptor (AR) signaling negatively regulates MIF, with ADT leading to MIF upregulation.
- MIF promotes prostate cancer cell proliferation by upregulating AMPD2 expression.
Conclusions:
- ADT induces MIF upregulation, contributing to prostate cancer cell proliferation and ADT resistance.
- Targeting MIF represents a promising therapeutic strategy to overcome ADT resistance.
- The AR-MIF-AMPD2 axis is a key pathway in the development of ADT resistance.
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