Abstract：
:Rheb is a small GTP-binding protein and its GTPase activity is activated by the complex of Tsc1 and Tsc2 whose mutations cause tuberous sclerosis complex (TSC). We previously reported that cultured TSC neurons showed impaired spine synapse morphogenesis in an mTORC1-independent manner. Here we show that the PDZ protein syntenin preferentially binds to the GDP-bound form of Rheb. The levels of syntenin are significantly higher in TSC neurons than in wild-type neurons because the Rheb-GDP-syntenin complex is prone to proteasomal degradation. Accumulated syntenin in TSC neurons disrupts spine synapse formation through inhibition of the association between syndecan-2 and calcium/calmodulin-dependent serine protein kinase. Instead, syntenin enhances excitatory shaft synapse formation on dendrites by interacting with ephrinB3. Downregulation of syntenin in TSC neurons restores both spine and shaft synapse densities. These findings suggest that Rheb-syntenin signalling may be a novel therapeutic target for abnormalities in spine and shaft synapses in TSC neurons.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Sugiura H,Yasuda S,Katsurabayashi S,Kawano H,Endo K,Takasaki K,Iwasaki K,Ichikawa M,Kobayashi T,Hino O,Yamagata Kdoi
10.1038/ncomms7842subject
Has Abstractpub_date
2015-04-16 00:00:00pages
6842issn
2041-1723pii
ncomms7842journal_volume
6pub_type
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