BACKGROUND: Expression profile analyses of midkine (MDK), a multifunctional protein important in development but repressed postnataly, indicate that it is highly expressed in approximately 80% of adult carcinomas and many childhood cancers including malignant peripheral nerve sheath tumors (MPNST). In the present study, we sought to leverage its selective expression to develop a novel oncolytic herpes simplex virus (oHSV) capable of targeting developmentally primitive cancers that express MDK. METHODS: We sought to increase the oncolytic efficacy of the virus by fusing the human MDK promoter to the HSV type 1 neurovirulence gene, gamma(1)34.5, whose protein product increases viral replication. RESULTS: Tissue-specific MDK promoter activity in human tumor cells and transgene biological activity was confirmed in human MPNST tumor cells. In vitro replication and cytotoxicity in human fibroblasts and MPNST cells by plaque and MTT assays showed that oHSV-MDK-34.5 increased replication and cytotoxicity compared to oHSV-MDK-Luc. By contrast, no significant difference in cytotoxicity was detected between these viruses in normal human fibroblasts. oHSV-MDK-34.5 impaired in vivo tumor growth and increased median survival of MPNST tumor-bearing nude mice. CONCLUSIONS: The transcriptional targeting of HSV lytic infection to MDK-expressing tumor cells is feasible. oHSV-MDK-34.5 shows enhanced anti-tumor effects both in vitro and in vivo. Further studies are warranted and may lead to its use in clinical trials. Copyright (c) 2010 John Wiley & Sons, Ltd.
BACKGROUND: Expression profile analyses of midkine (MDK), a multifunctional protein important in development but repressed postnataly, indicate that it is highly expressed in approximately 80% of adult carcinomas and many childhood cancers including malignant peripheral nerve sheath tumors (MPNST). In the present study, we sought to leverage its selective expression to develop a novel oncolytic herpes simplex virus (oHSV) capable of targeting developmentally primitive cancers that express MDK. METHODS: We sought to increase the oncolytic efficacy of the virus by fusing the humanMDK promoter to the HSV type 1 neurovirulence gene, gamma(1)34.5, whose protein product increases viral replication. RESULTS: Tissue-specific MDK promoter activity in humantumor cells and transgene biological activity was confirmed in human MPNST tumor cells. In vitro replication and cytotoxicity in human fibroblasts and MPNST cells by plaque and MTT assays showed that oHSV-MDK-34.5 increased replication and cytotoxicity compared to oHSV-MDK-Luc. By contrast, no significant difference in cytotoxicity was detected between these viruses in normal human fibroblasts. oHSV-MDK-34.5 impaired in vivo tumor growth and increased median survival of MPNST tumor-bearing nude mice. CONCLUSIONS: The transcriptional targeting of HSV lytic infection to MDK-expressing tumor cells is feasible. oHSV-MDK-34.5 shows enhanced anti-tumor effects both in vitro and in vivo. Further studies are warranted and may lead to its use in clinical trials. Copyright (c) 2010 John Wiley & Sons, Ltd.
Authors: J D Jackson; A M McMorris; J C Roth; J M Coleman; R J Whitley; G Y Gillespie; S L Carroll; J M Markert; K A Cassady Journal: Gene Ther Date: 2014-08-14 Impact factor: 5.250
Authors: Slawomir Antoszczyk; Melanie Spyra; Victor Felix Mautner; Andreas Kurtz; Anat O Stemmer-Rachamimov; Robert L Martuza; Samuel D Rabkin Journal: Neuro Oncol Date: 2014-01-26 Impact factor: 12.300
Authors: Gregory K Friedman; Elizabeth A Beierle; George Yancey Gillespie; James M Markert; Alicia M Waters; Chun-Yu Chen; Nicholas L Denton; Kellie B Haworth; Brian Hutzen; Jennifer L Leddon; Keri A Streby; Pin-Yi Wang; Timothy P Cripe Journal: Mol Ther Oncolytics Date: 2015-09-16 Impact factor: 7.200