scholarly journals Eliciting an immune-mediated antitumor response through oncolytic herpes simplex virus-based shared antigen expression in tumors resistant to viroimmunotherapy

2021 ◽  
Vol 9 (10) ◽  
pp. e002939
Author(s):  
Mohammed G Ghonime ◽  
Uksha Saini ◽  
Michael C Kelly ◽  
Justin C Roth ◽  
Pin-Yi Wang ◽  
...  
Keyword(s):  
Herpes Simplex Virus ◽  
Herpes Simplex ◽  
T Cell ◽  
Tumor Model ◽  
T Cell Response ◽  
Immune Recognition ◽  
Orthotopic Model ◽  
Immune Mediated ◽  
Oncolytic Herpes Simplex Virus ◽  
Simplex Virus

BackgroundOncolytic virotherapy (OV) is an immunotherapy that incorporates viral cancer cell lysis with engagement of the recruited immune response against cancer cells. Pediatric solid tumors are challenging targets because they contain both an inert immune environment and a quiet antigenic landscape, making them more resistant to conventional OV approaches. Further complicating this, herpes simplex virus suppresses host gene expression during virotherapy infection.MethodsWe therefore developed a multimodal oncolytic herpes simplex virus (oHSV) that expresses ephrin A2 (EphA2), a shared tumor-associated antigen (TAA) expressed by many tumors to improve immune-mediated antitumor activity. We verified the virus genotypically and phenotypically and then tested it in an oHSV-resistant orthotopic model (including immunophenotypic analysis), in flank and in T cell-deficient mouse models. We then assessed the antigen-expressing virus in an unrelated peripheral tumor model that also expresses the shared tumor antigen and evaluated functional T-cell response from the treated mice.ResultsVirus-based EphA2 expression induces a robust acquired antitumor immune responses in both an oHSV-resistant murine brain and peripheral tumor model. Our new multimodal oncolytic virus (1) improves survival in viroimmunotherapy resistant tumors, (2) alters both the infiltrating and peripheral T-cell populations capable of suppressing tumor growth on rechallenge, and (3) produces EphA2-specific CD8 effector-like populations.ConclusionsOur results suggest that this flexible viral-based platform enables immune recognition of the shared TAA and improves the immune-therapeutic response, thus making it well suited for low-mutational load tumors.

scholarly journals Immunization with Chaperone-Peptide Complex Induces Low-Avidity Cytotoxic T Lymphocytes Providing Transient Protection against Herpes Simplex Virus Infection

2002 ◽  
Vol 76 (1) ◽  
pp. 136-141 ◽  
Author(s):  
Udayasankar Kumaraguru ◽  
Malgorzata Gierynska ◽  
Shanna Norman ◽  
Barry D. Bruce ◽  
Barry T. Rouse
Keyword(s):  
Herpes Simplex Virus ◽  
Herpes Simplex ◽  
T Cell ◽  
T Cell Responses ◽  
Recombinant Vaccinia Virus ◽  
T Cell Response ◽  
Peptide Epitope ◽  
Cell Responses ◽  
Simplex Virus ◽  
Shock Proteins

ABSTRACT Heat shock proteins loaded with viral peptides were shown to induce a CD8+ T cell response and confer protective immunity against challenge with herpes simplex virus (HSV). The delivery system consisted of recombinant human hsp70 coupled to the peptide SSIEFARL, which is the immunodominant peptide epitope, recognized by HSV specific T cells in C57BL/6 mice. Immunization resulted in CD8+ T-cell responses, measured by peptide-specific tetramers and peptide-induced intracellular gamma interferon expression and cytotoxicity, similar to responses resulting from immunization with a recombinant vaccinia virus that expressed SSIEFARL as a minigene (VvgB) and UV-inactivated HSV. However, the durability of the hsp70-SSIEFARL response was less than that resulting from VvgB and HSV immunization and in addition the CD8+ T-cell responses in the memory phase were functionally less effective. Mice challenged soon after immunization showed excellent immunity, but by 90 days postimmunization this had waned to be significantly less than the level of immunity in both VvgB- and HSV-immunized mice.

scholarly journals Herpes Simplex Virus-Induced Keratitis: Evaluation of the Role of Molecular Mimicry in Lesion Pathogenesis

2001 ◽  
Vol 75 (7) ◽  
pp. 3077-3088 ◽  
Author(s):  
Shilpa P. Deshpande ◽  
Sujin Lee ◽  
Mei Zheng ◽  
Byeongwoon Song ◽  
David Knipe ◽  
...  
Keyword(s):  
Herpes Simplex Virus ◽  
Herpes Simplex ◽  
T Cell ◽  
Molecular Mimicry ◽  
T Cell Response ◽  
Activation Mechanism ◽  
Mouse Strains ◽  
Ocular Infection ◽  
Simplex Virus

ABSTRACT Viruses are suspected but usually unproven triggering factors in autoimmunity. One favored mechanism to explain the role of viruses in the genesis of autoimmunity is molecular mimicry. An immunoinflammatory blinding lesion called herpetic stromal keratitis (HSK) that follows ocular infection with herpes simplex virus (HSV) is suggested to result from a CD4+ T-cell response to a UL6 peptide of HSV that cross-reacts with a corneal autopeptide shared with the immunoglobulin G2ab (IgG2ab) isotype. The present report reevaluates the molecular mimicry hypothesis to explain HSK pathogenesis. Our results failed to reveal cross-reactivity between the UL6 and IgG2ab peptides or between peptide reactive T cells and HSV antigens. More importantly, animals infected with HSV failed to develop responses that reacted with either peptide, and infection with a recombinant vaccinia UL6 vector failed to cause HSK, in spite of generating UL6 reactivity. Other lines of evidence also failed to support the molecular mimicry hypothesis, such as the failure to affect HSK severity upon tolerization of susceptible BALB/c and B-cell-deficient mice with IgG2ab or UL6 peptides. An additional study system revealed that HSK could be induced in mouse strains, such as the OT2 × RAG1−/− mice (T cell receptor transgenic recognizing OVA323–339) that were unable to produce CD4+ T-cell responses to any detectable HSV antigens. Our results cast doubt on the molecular mimicry hypothesis as an explanation for the pathogenesis of HSK and indicate that if autoimmunity is involved its likely proceeds via a bystander activation mechanism.

scholarly journals Chimeric HCMV/HSV-1 and Δγ134.5 oncolytic herpes simplex virus elicit immune mediated antigliomal effect and antitumor memory

2018 ◽  
Vol 11 (1) ◽  
pp. 86-93 ◽  
Author(s):  
Mohammed G. Ghonime ◽  
Josh Jackson ◽  
Amish Shah ◽  
Justin Roth ◽  
Mao Li ◽  
...  
Keyword(s):  
Herpes Simplex Virus ◽  
Herpes Simplex ◽  
Immune Mediated ◽  
Oncolytic Herpes Simplex Virus ◽  
Simplex Virus ◽  
Hsv 1

scholarly journals CD4+ T Cells Are Required for the Priming of CD8+ T Cells following Infection with Herpes Simplex Virus Type 1

2009 ◽  
Vol 83 (10) ◽  
pp. 5256-5268 ◽  
Author(s):  
Naveen K. Rajasagi ◽  
Sadik H. Kassim ◽  
Christina M. Kollias ◽  
Xiangyi Zhao ◽  
Robert Chervenak ◽  
...  
Keyword(s):  
T Cells ◽  
Herpes Simplex Virus ◽  
Herpes Simplex ◽  
T Cell ◽  
Herpes Simplex Virus Type ◽  
T Cell Response ◽  
Simplex Virus ◽  
T Cell Help ◽  
Hsv 1

ABSTRACT The role of CD4+ helper T cells in modulating the acquired immune response to herpes simplex virus type 1 (HSV-1) remains ill defined; in particular, it is unclear whether CD4+ T cells are needed for the generation of the protective HSV-1-specific CD8+-T-cell response. This study examined the contribution of CD4+ T cells in the generation of the primary CD8+-T-cell responses following acute infection with HSV-1. The results demonstrate that the CD8+-T-cell response generated in the draining lymph nodes of CD4+-T-cell-depleted C57BL/6 mice and B6-MHC-II−/− mice is quantitatively and qualitatively distinct from the CD8+ T cells generated in normal C57BL/6 mice. Phenotypic analyses show that virus-specific CD8+ T cells express comparable levels of the activation marker CD44 in mice lacking CD4+ T cells and normal mice. In contrast, CD8+ T cells generated in the absence of CD4+ T cells express the interleukin 2 receptor α-chain (CD25) at lower levels. Importantly, the CD8+ T cells in the CD4+-T-cell-deficient environment are functionally active with respect to the expression of cytolytic activity in vivo but exhibit a diminished capacity to produce gamma interferon and tumor necrosis factor alpha. Furthermore, the primary expansion of HSV-1-specific CD8+ T cells is diminished in the absence of CD4+-T-cell help. These results suggest that CD4+-T-cell help is essential for the generation of fully functional CD8+ T cells during the primary response to HSV-1 infection.

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