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A chemical inhibitor of PPM1D that selectively kills cells overexpressing PPM1D
S Rayter1, R Elliott, J Travers
1Breakthrough Breast Cancer Research Centre, The Institute of Cancer Research, London, UK.
Abstract:
The PPM1D gene is aberrantly amplified in a range of common cancers and encodes a protein phosphatase that is a potential therapeutic target. However, the issue of whether inhibition of PPM1D in human tumour cells that overexpress this protein compromises their viability has not yet been fully addressed. We show here, using an RNA interference (RNAi) approach, that inhibition of PPM1D can indeed reduce the viability of human tumour cells and that this effect is selective; tumour cell lines that overexpress PPM1D are sensitive to PPM1D inhibition whereas cell lines with normal levels are not. Loss of viability associated with PPM1D RNAi in human tumour cells occurs via the activation of the kinase P38. To identify chemical inhibitors of PPM1D, a high-throughput screening of a library of small molecules was performed. This strategy successfully identified a compound that selectively reduces viability of human tumour cell lines that overexpress PPM1D. As expected of a specific inhibitor, the toxicity to PPM1D overexpressing cell lines after inhibitor treatment is P38 dependent. These results further validate PPM1D as a therapeutic target and identify a proof-of-principle small molecule inhibitor.
Insights
Inhibiting the PPM1D gene, amplified in many cancers, selectively reduces cancer cell viability. This targeted approach activates the P38 kinase and offers a new therapeutic strategy for cancer treatment.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- The PPM1D gene is frequently amplified in various human cancers.
- PPM1D encodes a protein phosphatase, making it a potential therapeutic target.
- The impact of PPM1D inhibition on the viability of human tumor cells requires further investigation.
Purpose of the Study:
- To investigate the effect of PPM1D inhibition on the viability of human tumor cells.
- To determine the selectivity of PPM1D inhibition in cancer cells.
- To identify chemical inhibitors of PPM1D and validate their mechanism of action.
Main Methods:
- RNA interference (RNAi) was employed to inhibit PPM1D expression.
- High-throughput screening of a small molecule library was conducted to identify PPM1D inhibitors.
- The role of P38 kinase activation in PPM1D inhibition-induced cell death was assessed.
Main Results:
- PPM1D inhibition selectively reduced the viability of human tumor cell lines overexpressing PPM1D.
- Tumor cell lines with normal PPM1D levels were resistant to PPM1D inhibition.
- PPM1D inhibition led to the activation of the P38 kinase, mediating cell death.
- A small molecule inhibitor selectively reduced the viability of PPM1D-overexpressing cell lines in a P38-dependent manner.
Conclusions:
- PPM1D is a validated therapeutic target in cancers with PPM1D amplification.
- Selective inhibition of PPM1D demonstrates anti-cancer potential.
- A proof-of-principle small molecule inhibitor targeting PPM1D has been identified.
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