TY  - JOUR
A1  - Weibel, Stephanie
A1  - Basse-Luesebrink, Thomas Christian
A1  - Hess, Michael
A1  - Hofmann, Elisabeth
A1  - Seubert, Carolin
A1  - Langbein-Laugwitz, Johanna
A1  - Gentschev, Ivaylo
A1  - Sturm, Volker Jörg Friedrich
A1  - Ye, Yuxiang
A1  - Kampf, Thomas
A1  - Jakob, Peter Michael
A1  - Szalay, Aladar A.
T1  - Imaging of Intratumoral Inflammation during Oncolytic Virotherapy of Tumors by \(^{19}\)F-Magnetic Resonance Imaging (MRI)
JF  - PLoS ONE
N2  - Background
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 \(^1H\)/\(^{19}\)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.
KW  - inflammation
KW  - fluorescence microscopy
KW  - oncolytic viruses
KW  - fluorescence imaging
KW  - macrophages
KW  - magnetic resonance imaging
KW  - histology
KW  - in vivo imaging
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-130311
VL  - 8
IS  - 3
ER  - 
TY  - JOUR
A1  - Szalay, Aladar A
A1  - Weibel, Stephanie
A1  - Hofmann, Elisabeth
A1  - Basse-Luesebrink, Thomas Christian
A1  - Donat, Ulrike
A1  - Seubert, Carolin
A1  - Adelfinger, Marion
A1  - Gnamlin, Prisca
A1  - Kober, Christina
A1  - Frentzen, Alexa
A1  - Gentschev, Ivaylo
A1  - Jakob, Peter Michael
T1  - Treatment of malignant effusion by oncolytic virotherapy in an experimental subcutaneous xenograft model of lung cancer
JF  - Journal of Translational Medicine
N2  - Background

Malignant pleural effusion (MPE) is associated with advanced stages of lung cancer and is mainly dependent on invasion of the pleura and expression of vascular endothelial growth factor (VEGF) by cancer cells. As MPE indicates an incurable disease with limited palliative treatment options and poor outcome, there is an urgent need for new and efficient treatment options.

Methods

In this study, we used subcutaneously generated PC14PE6 lung adenocarcinoma xenografts in athymic mice that developed subcutaneous malignant effusions (ME) which mimic pleural effusions of the orthotopic model. Using this approach monitoring of therapeutic intervention was facilitated by direct observation of subcutaneous ME formation without the need of sacrificing mice or special imaging equipment as in case of MPE. Further, we tested oncolytic virotherapy using Vaccinia virus as a novel treatment modality against ME in this subcutaneous PC14PE6 xenograft model of advanced lung adenocarcinoma.

Results

We demonstrated significant therapeutic efficacy of Vaccinia virus treatment of both advanced lung adenocarcinoma and tumor-associated ME. We attribute the efficacy to the virus-mediated reduction of tumor cell-derived VEGF levels in tumors, decreased invasion of tumor cells into the peritumoral tissue, and to viral infection of the blood vessel-invading tumor cells. Moreover, we showed that the use of oncolytic Vaccinia virus encoding for a single-chain antibody (scAb) against VEGF (GLAF-1) significantly enhanced mono-therapy of oncolytic treatment.

Conclusions

Here, we demonstrate for the first time that oncolytic virotherapy using tumor-specific Vaccinia virus represents a novel and promising treatment modality for therapy of ME associated with advanced lung cancer.
KW  - Oncolytic virotherapy
KW  - Malignant effusion
KW  - Lung cancer
KW  - VEGF
KW  - Lungenkrebs
KW  - Vascular endothelial Growth Factor
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-96016
UR  - http://www.translational-medicine.com/content/11/1/106
ER  -