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Cellular Immune Response to an Engineered Cell-based Tumor Vaccine at the Vaccination Site

Overview
Journal Cell Immunol
Publisher Elsevier
Date 2007 Jun 5
PMID 17543914
Citations 2
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Abstract

The engineered expression of the immune co-stimulatory molecules CD80 and CD137L on the surface of a neuroblastoma cell line converts this tumor into a cell-based cancer vaccine. The mechanism by which this vaccine activates the immune system was investigated by capturing and analyzing immune cells responding to the vaccine cell line embedded in a collagen matrix and injected subcutaneously. The vaccine induced a significant increase in the number of activated CD62L(-) CCR7(-) CD49b(+) CD8 effector memory T cells captured in the matrix. Importantly, vaccine responsive cells could be detected in the vaccine matrix within a matter of days as demonstrated by IFN-gamma production. The substitution of unmodified tumor cells for the vaccine during serial vaccination resulted in a significant decrease in activated T cells present in the matrix, indicating that immune responses at the vaccine site are a dynamic process that must be propagated by continued co-stimulation.

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