Exosomes are small vesicles released at high levels from cancer cells that are important modifiers of the tumor environment and contribute to disease progression. Exosomes contain molecular information about their cells of origin and can be isolated from many biological fluids including blood, urine, and saliva. It has recently been discovered that exosomes from breast cancer cells or the blood of patients with the disease can cause non- cancerous cells to form tumors. These findings suggest a critical role of exosomes in cancer development or disease progression, and create new opportunities for exosome-based diagnostics and therapies. Based on data from our studies and others, it is also becoming clear that cancer causing viruses utilize and modify the host cell exosome pathway, and these changes may contribute to disease. For example, cells infected with the Epstein-Barr virus (EBV), a human tumor virus, release exosomes that are enriched in viral products like the major viral oncogene latent membrane protein 1 (LMP1) and virally-encoded miRNAs. We have previously shown that LMP1 alters the cargo of exosomes released from infected cells and that these LMP1-modifed exosomes can exert oncogenic signaling functions on neighboring uninfected cells. In spite of the importance of inter-cellular transmission of LMP1-modifeid exosomes, very little is known about how this viral protein actually enters and manipulates the host exosome pathway. The overall goal of these studies is to determine the mechanisms that LMP1 drives exosome content reorganization and alters the functions of exosomes. We hypothesize that LMP1 exosomal trafficking modulates the components and biological properties of exosomes by altering endocytic routes and membrane microdomains. To test this, we aim to: 1.) investigate the mechanism through which LMP1 alters exosome components; 2.) determine the functions of LMP1-modified exosomes in intracellular communication and cellular transformation.

Public Health Relevance

The Epstein-Barr virus is considered the etiological agent of multiple human cancers, and has been estimated to account for approximately 200,000 new cancers worldwide each year. The viral protein, latent membrane protein 1, is consistently detected in many of the EBV-associated cancers, and is released from cells in exosomes where it can exhort its functions on the tumor microenvironment. Therefore, exosomal LMP1 likely contributes to pathogenesis within the host. In this project, we will investigate the molecular mechanisms driving LMP1-mediated exosome content and function manipulation that will aid in the design of novel therapeutics to combat EBV-associated malignancies.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Research Project (R01)
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Virology - A Study Section (VIRA)
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Daschner, Phillip J
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Florida State University
Other Basic Sciences
Schools of Medicine
United States
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Nkosi, Dingani; Howell, Lauren A; Cheerathodi, Mujeeb R et al. (2018) Transmembrane Domains Mediate Intra- and Extracellular Trafficking of Epstein-Barr Virus Latent Membrane Protein 1. J Virol 92:
Hurwitz, Stephanie N; Cheerathodi, Mujeeb R; Nkosi, Dingani et al. (2018) Tetraspanin CD63 Bridges Autophagic and Endosomal Processes To Regulate Exosomal Secretion and Intracellular Signaling of Epstein-Barr Virus LMP1 J Virol 92:
Rider, Mark A; Cheerathodi, Mujeeb R; Hurwitz, Stephanie N et al. (2018) The interactome of EBV LMP1 evaluated by proximity-based BioID approach. Virology 516:55-70
Hurwitz, Stephanie N; Nkosi, Dingani; Conlon, Meghan M et al. (2017) CD63 Regulates Epstein-Barr Virus LMP1 Exosomal Packaging, Enhancement of Vesicle Production, and Noncanonical NF-?B Signaling. J Virol 91:
Hurwitz, Stephanie N; Meckes Jr, David G (2017) An Adaptable Polyethylene Glycol-Based Workflow for Proteomic Analysis of Extracellular Vesicles. Methods Mol Biol 1660:303-317
Hurwitz, Stephanie N; Rider, Mark A; Bundy, Joseph L et al. (2016) Proteomic profiling of NCI-60 extracellular vesicles uncovers common protein cargo and cancer type-specific biomarkers. Oncotarget 7:86999-87015
Hurwitz, Stephanie N; Conlon, Meghan M; Rider, Mark A et al. (2016) Nanoparticle analysis sheds budding insights into genetic drivers of extracellular vesicle biogenesis. J Extracell Vesicles 5:31295