Abstract:
:Tumor necrosis factor-like weak inducer of apoptosis (TWEAK) and its receptor Fibroblast growth factor-inducible 14 (Fn14) are expressed in neurons. Here we demonstrate that TWEAK induces a dose-dependent increase in neuronal death and that this effect is independent of tumor necrosis factor alpha (TNF-α) and mediated by nuclear factor-kappa B (NF-κB) pathway activation. Incubation with TWEAK induces apoptotic cell death in wild-type (Wt) but not in Fn14 deficient (Fn14(-/-)) neurons. Intracerebral injection of TWEAK induces accumulation of poly(ADP-ribose) polymers (PAR) in Wt but not in Fn14(-/-) mice. Exposure to oxygen-glucose deprivation (OGD) conditions increases TWEAK and Fn14 mRNA expression in Wt neurons, and decreases cell survival in Wt but not in Fn14(-/-) or TWEAK deficient (TWEAK(-/-)) neurons. Experimental middle cerebral artery occlusion (MCAO) increases the expression of TWEAK and Fn14 mRNA and active caspase-3, and the cleavage of poly(ADP-ribose) polymerase-1 (PARP-1) with accumulation of PAR in the ischemic area in Wt but not Fn14(-/-) mice. Together, these results suggest a model where in response to hypoxia/ischemia the interaction between TWEAK and Fn14 in neurons induces PARP-1 activation with accumulation of PAR polymers and cell death via NF-κB pathway activation. This is a novel pathway for hypoxia/ischemia-induced TWEAK-mediated cell death and a potential therapeutic target for ischemic stroke.
journal_name
Neurosciencejournal_title
Neuroscienceauthors
Haile WB,Echeverry R,Wu F,Guzman J,An J,Wu J,Yepes Mdoi
10.1016/j.neuroscience.2010.10.029subject
Has Abstractpub_date
2010-12-29 00:00:00pages
1256-64issue
4eissn
0306-4522issn
1873-7544pii
S0306-4522(10)01359-Xjournal_volume
171pub_type
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