期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 3, 页码 1108-1113出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1316922111
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资金
- Jonsson Comprehensive Cancer Center (NIH ) [CA016042]
- Genoseq Core Facility
- Flow Cytometry Core Facility at UCLA
- UCLA Scholars in Oncologic Molecular Imaging training program [National Institutes of Health (NIH)] [R25T CA098010]
- California Institute for Regenerative Medicine [RT1-01126-1]
- California Institute for Regenerative Medicine Training [TG2-01169]
The noninvasive detection and quantification of CD8(+) T cells in vivo are important for both the detection and staging of CD8(+) lymphomas and for the monitoring of successful cancer immunotherapies, such as adoptive cell transfer and antibody-based immunotherapeutics. Here, antibody fragments are constructed to target murine CD8 to obtain rapid, high-contrast immuno-positron emission tomography (immuno-PET) images for the detection of CD8 expression in vivo. The variable regions of two anti-murine CD8-depleting antibodies (clones 2.43 and YTS169.4.2.1) were sequenced and reformatted into minibody (Mb) fragments (scFv-C(H)3). After production and purification, the Mbs retained their antigen specificity and bound primary CD8(+) T cells from the thymus, spleen, lymph nodes, and peripheral blood. Importantly, engineering of the parental antibodies into Mbs abolished the ability to deplete CD8(+) T cells in vivo. The Mbs were subsequently conjugated to S-2-(4-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1,4,7-triacetic acid for Cu-64 radiolabeling. The radiotracers were injected i. v. into antigen-positive, antigen-negative, immunodeficient, antigenblocked, and antigen-depletedmice to evaluate specificity of uptake in lymphoid tissues by immuno-PET imaging and ex vivo biodistribution. Both Cu-64-radiolabeled Mbs produced high-contrast immunoPET images 4 h postinjection and showed specific uptake in the spleen and lymph nodes of antigen-positive mice.
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