Abstract:
:CIN85 is a multidomain protein that associates with receptors carrying tyrosine kinase domains. Here we report that it is also a component of the signaling complex associated with tumor necrosis factor receptor 1 (TNFR1), which lacks a tyrosine kinase domain. This was established by showing that CIN85 was co-precipitated with TNFR1, TRADD, cIAP-1 and TARF1/2, but not with FADD, RIP, caspase-8 or TRAF6. However, CIN85 did not bind directly to the cytoplasmic domain of TNFR1 (TNFR1-CYT) but to Src family kinases, Cbl and the p85alpha subunit of phosphatidylinositol 3-kinase (PI3-K p85alpha). Src bound directly to TNFR1-CYT, but Cbl and PI3-K p85alpha did not. A human cell line ectopically expressing CIN85 was 10 times more susceptible to TNF-alpha-induced apoptosis than control cells, which expressed identical levels of TNFR1 on their surface. However, the susceptibility of these two cell lines to CD95-induced apoptosis was the same. The three SH3 domains of CIN85 were essential for this increased susceptibility to apoptosis and its proline-rich regions were also required for maximal effect. TNF-alpha treatment recruited CIN85 to the TNFR1 signaling complex. Taken together, these results indicate that CIN85 associates with TNFR1 via Src and modulates TNF-alpha-induced apoptosis.
journal_name
Exp Cell Resjournal_title
Experimental cell researchauthors
Narita T,Nishimura T,Yoshizaki K,Taniyama Tdoi
10.1016/j.yexcr.2004.11.005keywords:
subject
Has Abstractpub_date
2005-03-10 00:00:00pages
256-64issue
1eissn
0014-4827issn
1090-2422pii
S0014-4827(04)00682-2journal_volume
304pub_type
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