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Fibrosis in response to tissue damage or persistent inflammation is a pathological hallmark of many chronic degenerative diseases. By using a model of acute peritoneal inflammation, we have examined how repeated inflammatory activation promotes fibrotic tissue injury. In this context, fibrosis was strictly dependent on interleukin-6 (IL-6). Repeat inflammation induced IL-6-mediated T helper 1 (Th1)...
A paper by Martinvalet et al. (2005) in this issue of Immunity examines the mechanisms used by granzyme A to kill target cells after its cytoplasmic injection by cytotoxic lymphocytes. They show that this protease induces mitochondrial damage and generation of reactive oxygen species that are necessary for cell death.
Activation of ICE/Ced-3 family proteases (caspases) has been proposed to mediate both the granule exocytosis and Fas-Fas ligand pathways of rapid target cell death by cytotoxic T lymphocytes. In agreement with this model, two peptide fluoromethyl ketone caspase inhibitors and baculovirus p35 blocked apoptotic nuclear damage and target cell lysis by the CTL-mediated Fas-Fas ligand pathway. The peptide...
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