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Noninvasive monitoring of cancer therapy induced activated T cells using [18F]FB-IL-2 PET imaging.


ABSTRACT: Cancer immunotherapy urgently calls for methods to monitor immune responses at the site of the cancer. Since activated T lymphocytes may serve as a hallmark for anticancer responses, we targeted these cells using the radiotracer N-(4-[18F]fluorobenzoyl)-interleukin-2 ([18F]FB-IL-2) for positron emission tomography (PET) imaging. Thus, we noninvasively monitored the effects of local tumor irradiation and/or immunization on tumor-infiltrating and systemic activated lymphocytes in tumor-bearing mice. A 10- and 27-fold higher [18F]FB-IL-2 uptake was observed in tumors of mice receiving tumor irradiation alone or in combination with immunization, respectively. This increased uptake was extended to several non-target tissues. Administration of the CXCR4 antagonist AMD3100 reduced tracer uptake by 2.8-fold, indicating a CXCR4-dependent infiltration of activated T lymphocytes upon cancer treatment. In conclusion, [18F]FB-IL-2 PET can serve as a clinical biomarker to monitor treatment-induced infiltration of activated T lymphocytes and, on that basis, may guide cancer immunotherapies.

SUBMITTER: Hartimath SV 

PROVIDER: S-EPMC5283633 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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Noninvasive monitoring of cancer therapy induced activated T cells using [<sup>18</sup>F]FB-IL-2 PET imaging.

Hartimath S V SV   Draghiciu O O   van de Wall S S   Manuelli V V   Dierckx R A J O RA   Nijman H W HW   Daemen T T   de Vries E F J EF  

Oncoimmunology 20161118 1


Cancer immunotherapy urgently calls for methods to monitor immune responses at the site of the cancer. Since activated T lymphocytes may serve as a hallmark for anticancer responses, we targeted these cells using the radiotracer N-(4-[<sup>18</sup>F]fluorobenzoyl)-interleukin-2 ([<sup>18</sup>F]FB-IL-2) for positron emission tomography (PET) imaging. Thus, we noninvasively monitored the effects of local tumor irradiation and/or immunization on tumor-infiltrating and systemic activated lymphocyte  ...[more]

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