Can we dissolve the liquid-like 'hubs' that fuel aggressive cancer?
In short: In certain aggressive cancers, RNA stops being a simple messenger and starts acting as a construction crew. It builds liquid-like droplets that serve as command centers for tumor growth. Scientists are now developing molecular switches to dissolve these hubs and shut down the cancer's engine.
Researchers at Texas A&M University Health Science Center have identified a mechanism in translocation renal cell carcinoma (tRCC), a rare and aggressive kidney cancer primarily affecting children and young adults. In these cells, abnormal hybrid genes called TFE3 oncofusions hijack RNA to create 'droplet hubs.' Instead of just carrying genetic instructions, the RNA molecules assemble into liquid-like condensates in the cell nucleus. These droplets act as transcriptional hubs, clustering vital molecules together to activate genes that promote rapid tumor growth. This specific kidney cancer currently lacks any approved medical treatments. The study was published in the journal Nature Communications. These droplets function as command centers for activating growth-related genes.
Research identifies PSPC1, a particular RNA-binding protein, as a factor that reinforces these droplets to enhance their role in promoting the illness. To understand this, the team used a suite of tools including CRISPR gene editing to tag fusion proteins, SLAM-seq to measure new RNA, and proteomics to catalog the proteins pulled into the droplets. This revealed that RNA is an active structural player in cancer's architecture, rather than a passive messenger. The team utilized CUT&Tag and RIP-seq to map where fusion proteins bind to DNA and RNA. These methods helped reveal the precise targets of the proteins. The study offers an unprecedented view into the way RNA is seized by TFE3 oncofusions.
In order to counter this, a molecular switch based on nanobodies was created as a 'chemogenetic' device. This miniature antibody fragment is fused with a dissolver protein and is designed to lock onto the cancer-driving fusion proteins. This action allows for the deliberate liquidation of droplet hubs, successfully halting the primary process of malignant expansion. This discovery offers a potential new therapeutic pathway for multiple pediatric cancers that currently lack effective treatments. The researchers successfully tested this molecular switch in both laboratory settings and mouse models. This approach targets the core growth mechanism of the tumor. It represents a significant step toward treating various pediatric malignancies.
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Sources
- Summary by Intellect · source: How to Stop Cancer Using RNA
- Also: They found cancer’s hidden power hubs and learned how to melt them away
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