Benign tumors can be transformed into cancer by virus

A new discovery by UNC scientists describes how cells infected by the Epstein-Barr virus (EBV) produce small vesicles or sacs called exosomes, changing their cellular "cargo" of proteins and RNA. This altered exosome enters cells and can change the growth of recipient cells from benign to cancer-producing.
Nancy Raab-Traub, PhD, professor of microbiology and Immunology, said, "Exosomes may be the Trojan Horse through which EBV gains control of cells that are not even infected. Importantly, the production of exosomes may provide a new therapeutic target that can be blocked to reduce cancer growth." Raab-Traub is a Sarah Graham Kenan Professor and member of UNC Lineberger Comprehensive Cancer Center.
Epstein-Barr Virus (EBV) is perhaps the world’s most successful virus as almost everyone is infected with it for life. EBV cannot be eliminated by the immune system and is constantly secreted into saliva where it is effectively transmitted. Infection with the virus rarely causes disease; however, EBV is found in several major cancers, including lymphoma and cancer of the nose and throat, where its proteins hijack the cell’s growth regulatory mechanisms to induce uncontrolled cell growth characteristic of cancer.
The immune system is constantly on guard to identify foreign viral proteins. Through exosomal uptake, cancer cells would be stimulated to grow without the expression of proteins that "announce" infection to the immune system, thus allowing unchecked growth. The study also showed that the cells that produce blood vessels, the process called angiogenesis, readily take in the altered exosomes and are potentially induced to grow.

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