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Identification of gene expression alteration in macrophage cells with oncolytic HSV

ABSTRACT: Identification of gene expression alteration in macrophage cells with oncolytic HSV

PROVIDER: PRJNA759634 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR15691825_1.fastq.gz	Fastqsanger.gz
	SRR15691825_2.fastq.gz	Fastqsanger.gz
	SRR15691826_1.fastq.gz	Fastqsanger.gz
	SRR15691826_2.fastq.gz	Fastqsanger.gz
	SRR15691827_1.fastq.gz	Fastqsanger.gz

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Project description:We used microarrays to identify genes regulated during oncolytic HSV infection. Oncolytic herpes simplex viruses (oHSV) are promising anticancer therapeutics. We sought to identify alterations in gene expression during oHSV infection of human cancer cells. Human malignant peripheral nerve sheath tumor (MPNST) cells were infected with G207, an ICP34.5-deleted oHSV previously evaluated in clinical trials. G207-infected cells demonstrated massive degradation of cellular mRNAs, while a subset were upregulated. A gene signature of 21 oHSV-induced genes contained 7 genes known to be HSV-induced. Go ontology classification revealed that a majority of upregulated genes are involved in Jak/STAT signaling, transcriptional regulation, nucleic acid metabolism, protein synthesis and apoptosis. Ingenuity-defined functional networks highlighted nodes for AP-1 subunits and interferon signaling via STAT1, SOCS1, SOCS3 and RANTES. Upregulation of SOCS1 correlated with sensitivity of MPNST lines to G207 and depletion of SOCS1 reduced virus replication >1-log. The transcriptome of oHSV-induced genes may predict oncolytic efficacy and provides rationale for next generation oncolytics. Experiment Overall Design: 5 human MPNST cancer cell lines were infected with G207 or mock infected for 6 hours followed by RNA extraction and hybridization on Affymetrix microarrays.

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Expression data from Human MPNST cancer cells infected with G207 and oncolytic HSV

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Identification of gene expression alteration in macrophage cells with oncolytic HSV

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Single-cell RNA sequencing reveals a strong connection between Gadd45g upregulation and oncolytic HSV infection in tumor tissue

Project description:The oncolytic effect of virotherapy derives from the intrinsic capability of the applied virus in selectively infecting and killing tumor cells. Although oncolytic viruses of various constructions have been shown to efficiently infect and kill tumor cells in vitro, the efficiency of these viruses to exert the same effect on tumor cells within tumor tissues in vivo has not been extensively investigated. Here we report our studies using single-cell RNA sequencing to comprehensively analyze the gene expression profile of tumor tissues following herpes simplex virus 2-based oncolytic virotherapy. Our data revealed the extent and cell types within the tumor microenvironment that could be infected by the virus. Moreover, we observed changes in the expression of cellular genes, including antiviral genes, in response to viral infection. One notable gene found to be upregulated significantly in oncolytic virus-infected tumor cells was Gadd45g, which is desirable for optimal virus replication. These results not only help reveal the precise infection status of the oncolytic virus in vivo, but also provide insight that may lead to the development of new strategies to further enhance the therapeutic efficacy of oncolytic virotherapy.

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Project description:Purpose: Brain angiogenesis inhibitor (BAI1) facilitates phagocytosis and bacterial pathogen clearance by macrophages; however, its role in viral infections is unknown. Here, we examined the role of BAI1, and its N-terminal cleavage fragment (Vstat120) in antiviral macrophage responses to oncolytic herpes simplex virus (oHSV).Experimental Design: Changes in infiltration and activation of monocytic and microglial cells after treatment of glioma-bearing mice brains with a control (rHSVQ1) or Vstat120-expressing (RAMBO) oHSV was analyzed using flow cytometry. Co-culture of infected glioma cells with macrophages or microglia was used to examine antiviral signaling. Cytokine array gene expression and Ingenuity Pathway Analysis (IPA) helped evaluate changes in macrophage signaling in response to viral infection. TNFα-blocking antibodies and macrophages derived from Bai1-/- mice were used.Results: RAMBO treatment of mice reduced recruitment and activation of macrophages/microglia in mice with brain tumors, and showed increased virus replication compared with rHSVQ1. Cytokine gene expression array revealed that RAMBO significantly altered the macrophage inflammatory response to infected glioma cells via altered secretion of TNFα. Furthermore, we showed that BAI1 mediated macrophage TNFα induction in response to oHSV therapy. Intracranial inoculation of wild-type/RAMBO virus in Bai1-/- or wild-type non-tumor-bearing mice revealed the safety of this approach.Conclusions: We have uncovered a new role for BAI1 in facilitating macrophage anti-viral responses. We show that arming oHSV with antiangiogenic Vstat120 also shields them from inflammatory macrophage antiviral response, without reducing safety. Clin Cancer Res; 23(7); 1809-19. ©2016 AACR.

| S-EPMC5380537 | biostudies-literature

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