title: Toso regulates the balance between apoptotic and nonapoptotic death receptor signaling by facilitating RIP1 ubiquitination.
abstract: The regulation of cellular survival and apoptosis is of critical importance for the immune system to maintain immune homeostasis and to establish tolerance. Here, we demonstrate that the immune specific cell surface molecule Toso exhibits antiapoptotic effects on death receptor signaling by a novel regulatory mechanism involving the adaptor kinase RIP1. The antiapoptotic function of Toso depends on RIP1 ubiquitination and involves the recruitment of the death adaptor FADD to a Toso/RIP1 protein complex. In response to CD95L and TNFα, Toso promotes the activation of MAPK and NF-κB signaling pathways. Because of this relative augmentation of survival versus apoptotic signals, Toso raises the threshold for death receptor-mediated apoptosis. Our analysis of Toso-deficient mice revealed that Toso is essential for TNFα-mediated liver damage. Furthermore, the antiapoptotic function of Toso could be blocked by a Toso-specific monoclonal antibody, opening up new therapeutic prospects for the treatment of immune disorders and hematologic malignancies.
authors: Department of Immunology and Cell Biology, Research Center Borstel, Leibniz Center for Medicine and Biosciences, Borstel, Germany.
authors: Xuan-Hung
authors: XH
authors: Nguyen
authors: Philipp A
authors: PA
authors: Lang
authors: Karl S
authors: KS
authors: Lang
authors: Dieter
authors: D
authors: Adam
authors: Gulnar
authors: G
authors: Fattakhova
authors: Niko
authors: N
authors: Föger
authors: Mohammad Azhar
authors: MA
authors: Kamal
authors: Patricia
authors: P
authors: Prilla
authors: Sabine
authors: S
authors: Mathieu
authors: Christina
authors: C
authors: Wagner
authors: Tak
authors: T
authors: Mak
authors: Andrew C
authors: AC
authors: Chan
authors: Kyeong-Hee
authors: KH
authors: Lee