How a Virus Causes Kaposi's Sarcoma by Increasing a Growth Factor
Author Information
Author(s): Jham Bruno C., Ma Tao, Hu Jiadi, Chaisuparat Risa, Friedman Eitan R., Pandolfi Pier Paolo, Schneider Abraham, Sodhi Akrit, Montaner Silvia
Primary Institution: University of Maryland, Baltimore, Maryland, United States of America
Hypothesis
Does the KSHV vGPCR increase VEGF levels in Kaposi's sarcoma through a paracrine mechanism?
Conclusion
The study shows that the KSHV vGPCR enhances VEGF secretion in Kaposi's sarcoma through a complex signaling mechanism involving mTOR and HIF activation.
Supporting Evidence
- The KSHV vGPCR activates multiple signaling pathways that lead to increased VEGF secretion.
- Pharmacological inhibition of HIF resulted in reduced tumor growth in a mouse model.
- Conditioned media from vGPCR-expressing cells promoted VEGF expression in neighboring cells.
Takeaway
A virus can make cancer cells produce more of a growth signal, which helps the cancer grow. This study found that a specific virus does this by using a special pathway in the cells.
Methodology
The study used a mouse model and cell culture experiments to investigate the signaling pathways activated by the KSHV vGPCR.
Digital Object Identifier (DOI)
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