Complement activation cascade and its regulation: relevance for the response of solid tumors to photodynamic therapy

Journal of Photochemistry and Photobiology. B, Biology
M Korbelik, Ivana Cecic

Abstract

The complement system has emerged as a prominent participant in host response elicited following treatment of solid tumors by photodynamic therapy (PDT). Activity of the complement system is tightly controlled by a series of endogenous regulatory proteins. The expression of decay-accelerating factor (DAF), complement-receptor-1-related protein y (Crry), and protectin, which are the three major mouse membrane-bound complement regulatory proteins (mCRPs), was examined following treatment of murine squamous cell carcinomas SCCVII by PDT mediated by the photosensitizer Photofrin. A marked decrease was detected in the expression of all three mCRPs on cancer cells from tumors following PDT, indicating that these cells were made more vulnerable to complement attack. In order to amplify this effect, following PDT mice were injected with antibodies neutralizing either Crry, protectin, or DAF. With anti-Crry and anti-protectin this resulted in increased tumor cure rate compared to PDT alone, while the contrary was observed with PDT plus anti-DAF combination (presumably owing to additional role of DAF in T cell signaling). Further examination including other complement regulatory proteins showed that combining antitumor PDT with antibody-...Continue Reading

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