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- W4361239120 abstract "<div>Abstract<p>A major parameter limiting immune responses to vaccination is the number of activated antigen-presenting cells (APC) that capture antigen and migrate to draining lymph nodes (LN). Currently, a quantitative noninvasive technique for monitoring <i>in vivo</i> antigen capture and delivery is lacking. The use of cellular magnetic resonance (MR) imaging (MRI) is a promising approach for this purpose; however, cellular imaging currently requires <i>ex vivo</i> prelabeling of cells with contrast agents followed by reintroduction of cells into the subject being monitored. Here, we describe an <i>in vivo</i> labeling method, which relies upon cell-to-cell transfer of superparamagnetic iron oxide (SPIO) from tumor cells to endogenous APCs, <i>in situ</i>, to quantify APC delivery to LNs in a tumor vaccine model. Mice were immunized with a tumor cell–based vaccine that was irradiated and labeled with SPIO. APCs that had captured SPIO were imaged over time as they accumulated in LNs. We show here that MRI is capable of monitoring, <i>in vivo</i>, the trafficking of magnetically labeled APCs inducing a tumor-specific immune response, and that these cells can be magnetically recovered <i>ex vivo</i>. Excellent correlation was observed between <i>in vivo</i> and <i>ex vivo</i> quantification of APCs, with resolution sufficient to detect increased APC trafficking elicited by an adjuvant. This study shows the potential of magnetovaccination and MRI cell tracking to systematically evaluate a key parameter relevant to the optimization of vaccine therapies through noninvasive MRI-based quantification of APC numbers. [Cancer Res 2009;69(7):3180–7]</p></div>" @default.
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- W4361239120 date "2023-03-30" @default.
- W4361239120 modified "2023-10-16" @default.
- W4361239120 title "Data from Magnetovaccination as a Novel Method to Assess and Quantify Dendritic Cell Tumor Antigen Capture and Delivery to Lymph Nodes" @default.
- W4361239120 doi "https://doi.org/10.1158/0008-5472.c.6499868.v1" @default.
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