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An Effective Immuno-PET Imaging Method to Monitor CD8-Dependent Responses to Immunotherapy.


ABSTRACT: The rapidly advancing field of cancer immunotherapy is currently limited by the scarcity of noninvasive and quantitative technologies capable of monitoring the presence and abundance of CD8(+) T cells and other immune cell subsets. In this study, we describe the generation of (89)Zr-desferrioxamine-labeled anti-CD8 cys-diabody ((89)Zr-malDFO-169 cDb) for noninvasive immuno-PET tracking of endogenous CD8(+) T cells. We demonstrate that anti-CD8 immuno-PET is a sensitive tool for detecting changes in systemic and tumor-infiltrating CD8 expression in preclinical syngeneic tumor immunotherapy models including antigen-specific adoptive T-cell transfer, agonistic antibody therapy (anti-CD137/4-1BB), and checkpoint blockade antibody therapy (anti-PD-L1). The ability of anti-CD8 immuno-PET to provide whole body information regarding therapy-induced alterations of this dynamic T-cell population provides new opportunities to evaluate antitumor immune responses of immunotherapies currently being evaluated in the clinic.

SUBMITTER: Tavare R 

PROVIDER: S-EPMC4703530 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature

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An Effective Immuno-PET Imaging Method to Monitor CD8-Dependent Responses to Immunotherapy.

Tavaré Richard R   Escuin-Ordinas Helena H   Mok Stephen S   McCracken Melissa N MN   Zettlitz Kirstin A KA   Salazar Felix B FB   Witte Owen N ON   Ribas Antoni A   Wu Anna M AM  

Cancer research 20151116 1


The rapidly advancing field of cancer immunotherapy is currently limited by the scarcity of noninvasive and quantitative technologies capable of monitoring the presence and abundance of CD8(+) T cells and other immune cell subsets. In this study, we describe the generation of (89)Zr-desferrioxamine-labeled anti-CD8 cys-diabody ((89)Zr-malDFO-169 cDb) for noninvasive immuno-PET tracking of endogenous CD8(+) T cells. We demonstrate that anti-CD8 immuno-PET is a sensitive tool for detecting changes  ...[more]

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