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Reprimo (RPRM): A Tumor Suppressor That Induces Extrinsic Apoptosis via YAP Signaling
Masahiro Takikawa1,2, Rieko Ohki1
1Laboratory of Fundamental Oncology, National Cancer Center Research Institute, Tokyo, Japan.
Reprimo (RPRM) is a tumor suppressor. It has a novel extracellular function, acting as a ligand that triggers apoptosis by regulating the Hippo-YAP pathway, offering new cancer therapy potential.
Area of Science:
- Oncology
- Molecular Biology
- Cell Signaling
Background:
- Reprimo (RPRM) is a known tumor suppressor and p53 target gene.
- RPRM promoter hypermethylation silences its transcription in various cancers.
- Previous studies linked RPRM overexpression to cell cycle arrest, apoptosis, and DNA damage sensitivity.
Purpose of the Study:
- To elucidate the complete molecular function of Reprimo.
- To highlight Reprimo's novel extracellular role in inducing apoptosis.
- To detail the newly identified p53-Reprimo-protocadherin-Hippo-YAP/TAZ-p73 signaling pathway.
Main Methods:
- Literature review of Reprimo's known functions.
- Analysis of recent studies on Reprimo's extracellular activity.
- Examination of the novel signaling pathway involving Reprimo.
Main Results:
- Reprimo is secreted extracellularly to induce apoptosis in target cells.
- A novel signaling pathway (p53-Reprimo-protocadherin-Hippo-YAP/TAZ-p73) mediates this apoptosis.
- Reprimo is the first identified extracellular ligand modulating YAP activity and regulating Hippo signaling.
Conclusions:
- Reprimo possesses a unique extracellular tumor-suppressive mechanism.
- Reprimo's role as an upstream regulator of Hippo signaling is significant.
- Reprimo presents potential as a therapeutic target and agent in cancer treatment.
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