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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.