Comparison of infectivity and spread between HSV-1 and HSV-2 based oncolytic viruses on tumor cells with different receptor expression profiles
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Xinping Fu1,2, Lihua Tao1,2, Pin-Yi Wang3,4, Timothy P. Cripe3,4 and Xiaoliu Zhang1,2
1Department of Biology and Biochemistry, University of Houston, Houston, Texas, USA
2Center for Nuclear Receptors and Cell Signaling, University of Houston, Houston, Texas, USA
3Center for Childhood Cancer and Blood Diseases, Nationwide Children’s Hospital, Columbus, Ohio, USA
4Department of Pediatrics, The Ohio State University, Columbus, Ohio, USA
Xiaoliu Zhang, email: email@example.com
Keywords: oncolytic herpes simplex virus; virotherapy; virus receptors; virus entry; infectivity
Received: January 29, 2018 Accepted: March 17, 2018 Published: April 20, 2018
Herpes simplex virus (HSV) is one of the many viruses that have been modified or adapted for oncolytic purposes. There are two serotypes of HSV, HSV-1 and HSV-2. The majority of oncolytic HSVs, including T-VEC which has recently been approved by the US Food and Drug Administration (FDA) for clinical use in treating late stage melanoma patients, are derived from HSV-1. Recently, we and others have developed several HSV-2 based oncolytic viruses. During our in vitro characterization of oncolytic viruses developed from both serotypes (Baco-1 from HSV-1 and FusOn-H2 from HSV-2), we noticed there is a subpopulation of cancer cells in which both viruses could infect but only FusOn-H2 could spread from cell to cell on monolayers. This observation prompted us to investigate the virus receptor expression profiles in these and other tumor cells. Our data show the following: 1) This subpopulation of tumor cells only express nectin-2, not the other two major receptors (HVEM or nectin-1). 2) Baco-1 grows to a higher titer than FusOn-H2 in this subpopulation of tumor cells, but the latter kills these tumor cells more efficiently than the former. 3) FusOn-H2 is effective at treating tumors formed from these tumor cells while Baco-1 is completely ineffective. Our results suggest that this subpopulation of tumor cells may be intrinsically resistant to the therapeutic effect of a HSV-1 based oncolytic virus but they remain sensitive to a HSV-2 based virotherapy.
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