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Imaging of intratumoral inflammation during oncolytic virotherapy of tumors by 19F-magnetic resonance imaging (MRI).

AbstractBACKGROUND:
Oncolytic virotherapy of tumors is an up-coming, promising therapeutic modality of cancer therapy. Unfortunately, non-invasive techniques to evaluate the inflammatory host response to treatment are rare. Here, we evaluate (19)F magnetic resonance imaging (MRI) which enables the non-invasive visualization of inflammatory processes in pathological conditions by the use of perfluorocarbon nanoemulsions (PFC) for monitoring of oncolytic virotherapy.
METHODOLOGY/PRINCIPAL FINDINGS:
The Vaccinia virus strain GLV-1h68 was used as an oncolytic agent for the treatment of different tumor models. Systemic application of PFC emulsions followed by (1)H/(19)F MRI of mock-infected and GLV-1h68-infected tumor-bearing mice revealed a significant accumulation of the (19)F signal in the tumor rim of virus-treated mice. Histological examination of tumors confirmed a similar spatial distribution of the (19)F signal hot spots and CD68(+)-macrophages. Thereby, the CD68(+)-macrophages encapsulate the GFP-positive viral infection foci. In multiple tumor models, we specifically visualized early inflammatory cell recruitment in Vaccinia virus colonized tumors. Furthermore, we documented that the (19)F signal correlated with the extent of viral spreading within tumors.
CONCLUSIONS/SIGNIFICANCE:
These results suggest (19)F MRI as a non-invasive methodology to document the tumor-associated host immune response as well as the extent of intratumoral viral replication. Thus, (19)F MRI represents a new platform to non-invasively investigate the role of the host immune response for therapeutic outcome of oncolytic virotherapy and individual patient response.
AuthorsStephanie Weibel, Thomas Christian Basse-Luesebrink, Michael Hess, Elisabeth Hofmann, Carolin Seubert, Johanna Langbein-Laugwitz, Ivaylo Gentschev, Volker Jörg Friedrich Sturm, Yuxiang Ye, Thomas Kampf, Peter Michael Jakob, Aladar A Szalay
JournalPloS one (PLoS One) Vol. 8 Issue 2 Pg. e56317 ( 2013) ISSN: 1932-6203 [Electronic] United States
PMID23441176 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Antigens, CD
  • Antigens, Differentiation, Myelomonocytic
  • CD68 antigen, human
  • Fluorocarbons
Topics
  • Animals
  • Antigens, CD (metabolism)
  • Antigens, Differentiation, Myelomonocytic (metabolism)
  • Cell Line, Tumor
  • Disease Models, Animal
  • Female
  • Fluorocarbons
  • Genetic Vectors (genetics)
  • Humans
  • Inflammation (diagnosis, immunology)
  • Macrophages (immunology, metabolism)
  • Magnetic Resonance Imaging
  • Mice
  • Nanoparticles
  • Nanotechnology
  • Neoplasms (diagnosis, immunology, therapy)
  • Oncolytic Virotherapy
  • Oncolytic Viruses (genetics)
  • Spatio-Temporal Analysis
  • Transplantation, Heterologous
  • Vaccinia virus (genetics)

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