Abstract:
:Tumor necrosis factor (TNF) contributes to insulin resistance by binding to the 55kDa TNF receptor (TNF-R55), resulting in serine phosphorylation of proteins such as insulin receptor (IR) substrate (IRS)-1, followed by reduced tyrosine phosphorylation of IRS-1 through the IR and, thereby, diminished IR signal transduction. Through independent receptor domains, TNF-R55 activates a neutral (N-SMase) and an acid sphingomyelinase (A-SMase), that both generate the sphingolipid ceramide. Multiple candidate kinases have been identified that serine-phosphorylate IRS-1 in response to TNF or ceramide. However, due to the fact that the receptor domain of TNF-R55 mediating inhibition of the IR has not been mapped, it is currently unknown whether TNF exerts these effects with participation of N-SMase or A-SMase. Here, we identify the death domain of TNF-R55 as responsible for the inhibitory effects of TNF on tyrosine phosphorylation of IRS-1, implicating ceramide generated by A-SMase as a downstream mediator of inhibition of IR signaling.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Csehi SB,Mathieu S,Seifert U,Lange A,Zweyer M,Wernig A,Adam Ddoi
10.1016/j.bbrc.2005.01.140subject
Has Abstractpub_date
2005-04-01 00:00:00pages
397-405issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(05)00205-6journal_volume
329pub_type
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