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10.4049/jimmunol.1502672

http://scihub22266oqcxt.onion/10.4049/jimmunol.1502672
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suck abstract from ncbi


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pmid28341670
      J+Immunol 2017 ; 198 (9 ): 3507-3514
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  • Prime-Boost Immunization Eliminates Metastatic Colorectal Cancer by Producing High-Avidity Effector CD8(+) T Cells #MMPMID28341670
  • Xiang B ; Baybutt TR ; Berman-Booty L ; Magee MS ; Waldman SA ; Alexeev VY ; Snook AE
  • J Immunol 2017[May]; 198 (9 ): 3507-3514 PMID28341670 show ga
  • Heterologous prime-boost immunization with plasmid DNA and viral vector vaccines is an emerging approach to elicit CD8(+) T cell-mediated immunity targeting pathogens and tumor Ags that is superior to either monotherapy. Yet, the mechanisms underlying the synergy of prime-boost strategies remain incompletely defined. In this study, we examine a DNA and adenovirus (Ad5) combination regimen targeting guanylyl cyclase C (GUCY2C), a receptor expressed by intestinal mucosa and universally expressed by metastatic colorectal cancer. DNA immunization efficacy was optimized by i.m. delivery via electroporation, yet it remained modest compared with Ad5. Sequential immunization with DNA and Ad5 produced superior antitumor efficacy associated with increased TCR avidity, whereas targeted disruption of TCR avidity enhancement eliminated GUCY2C-specific antitumor efficacy, without affecting responding T cell number or cytokine profile. Indeed, functional TCR avidity of responding GUCY2C-specific CD8(+) T cells induced by various prime or prime-boost regimens correlated with antitumor efficacy, whereas T cell number and cytokine profile were not. Importantly, although sequential immunization with DNA and Ad5 maximized antitumor efficacy through TCR avidity enhancement, it produced no autoimmunity, reflecting sequestration of GUCY2C to intestinal apical membranes and segregation of mucosal and systemic immunity. Together, TCR avidity enhancement may be leveraged by prime-boost immunization to improve GUCY2C-targeted colorectal cancer immunotherapeutic efficacy and patient outcomes without concomitant autoimmune toxicity.
  • |Adenoviridae/genetics [MESH]
  • |Animals [MESH]
  • |Biomarkers, Tumor/genetics/*metabolism [MESH]
  • |CD8-Positive T-Lymphocytes/*physiology/transplantation [MESH]
  • |Cells, Cultured [MESH]
  • |Colorectal Neoplasms/immunology/*therapy [MESH]
  • |Cytotoxicity, Immunologic [MESH]
  • |Immunity, Mucosal [MESH]
  • |Immunization, Secondary [MESH]
  • |Immunotherapy, Adoptive/*methods [MESH]
  • |Intestinal Mucosa/*physiology [MESH]
  • |Mice [MESH]
  • |Mice, Inbred BALB C [MESH]
  • |Neoplasm Metastasis [MESH]
  • |Receptors, Antigen, T-Cell/metabolism [MESH]
  • |Receptors, Enterotoxin [MESH]
  • |Receptors, Guanylate Cyclase-Coupled/genetics/*metabolism [MESH]
  • |Receptors, Peptide/genetics/*metabolism [MESH]
  • |Tumor Burden [MESH]


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