Ectodomain shedding of EGFR ligands and TNFR1 dictates hepatocyte apoptosis during fulminant hepatitis in mice.

The Journal of Clinical Investigation
Aditya MurthyRama Khokha

Abstract

The cell death receptor Fas plays a role in the establishment of fulminant hepatitis, a major cause of drug-induced liver failure. Fas activation elicits extrinsic apoptotic and hepatoprotective signals; however, the mechanisms by which these signals are integrated during disease are unknown. Tissue inhibitor of metalloproteinases 3 (TIMP3) controls the critical sheddase a disintegrin and metalloproteinase 17 (ADAM17) and may dictate stress signaling. Using mice and cells lacking TIMP3, ADAM17, and ADAM17-regulated cell surface molecules, we have found that ADAM17-mediated ectodomain shedding of TNF receptors and EGF family ligands controls activation of multiple signaling cascades in Fas-induced hepatitis. We demonstrated that TNF signaling promoted hepatotoxicity, while excessive TNF receptor 1 (TNFR1) shedding in Timp3-/- mice was protective. Compound Timp3-/-Tnf-/- and Timp3-/-Tnfr1-/- knockout conferred complete resistance to Fas-induced toxicity. Loss of Timp3 enhanced metalloproteinase-dependent EGFR signaling due to increased release of the EGFR ligands TGF-alpha, amphiregulin, and HB-EGF, while depletion of shed amphiregulin resensitized Timp3-/- hepatocytes to apoptosis. Finally, adenoviral delivery of Adam17 prevente...Continue Reading

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Methods Mentioned

BETA
flow cytometry
PCR
ELISA

Software Mentioned

GraphPad
GraphPad Prism

Related Concepts

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Apoptosis

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