Local Fas/APO-1 (CD95) ligand-mediated tumor cell killing in vivo

European Journal of Immunology
A Rensing-EhlA Fontana

Abstract

Fas/APO-1 (CD95) is a cell surface receptor which mediates apoptosis when ligated by specific antibodies or by its recently cloned natural ligand, FasL. We have studied the cytotoxic potential of FasL in vivo using Fas/APO-1-expressing Yac-1 cells as targets. Supernatant harvested from Neuro-2a cells transfected with the murine FasL cDNA contains FasL and transduces a potent apoptotic signal to Yac-1 cells in vitro. Specificity of FasL-mediated cytotoxicity was confirmed by competition assays using soluble Fas or anti-Fas/APO-1 F(ab')2 fragments which specifically interfere with FasL-Fas/APO-1 interactions. Intraperitoneal injection of FasL-containing supernatant efficiently killed Yac-1 target cells which had been implanted in capsules into the peritoneal cavity of mice. Analysis of the target cells revealed DNA fragmentation and nuclear changes typical of apoptosis. As previously shown, intraperitoneal injection of anti-Fas/APO-1 antibodies caused liver failure (Ogasawara, J., Watanabe, F.R., Adachi, M., Matsuzawa, A., Kasugai, T., Kitamura, Y., Itoh, N., Suda, T. and Nagata, S., Nature 1993. 364:806) and was observed at doses which did not reduce Yac-1 cell viability. In contrast, FasL did not induce histopathology in the li...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis