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Sci Rep. 2014 Jun 3;4:5155. doi: 10.1038/srep05155.

Activation of Rheb, but not of mTORC1, impairs spine synapse morphogenesis in tuberous sclerosis complex.

Author information

1
1] Neural Plasticity Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan [2].
2
Department of Neuropharmacology, Faculty of Pharmaceutical Sciences, Fukuoka University, Fukuoka, Japan.
3
Neural Plasticity Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan.
4
Department of Biomedical Sciences, College of Life Sciences, Ritsumeikan University, Shiga, Japan.
5
Department of Pathology and Oncology, Juntendo University, School of Medicine, Tokyo, Japan.

Abstract

Mutations in the Tsc1 or Tsc2 genes cause tuberous sclerosis complex (TSC). Tsc1 and Tsc2 proteins form a complex that inhibits mammalian target of rapamycin complex 1 (mTORC1) signalling through Rheb-GTPase. We found that Tsc2(+/-) neurons showed impaired spine synapse formation, which was resistant to an mTORC1 inhibitor. Knockdown of mTOR also failed to restore these abnormalities, suggesting mTORC may not participate in impaired spinogenesis in Tsc2(+/-) neurons. To address whether Rheb activation impairs spine synapse formation, we expressed active and inactive forms of Rheb in WT and Tsc2(+/-) neurons, respectively. Expression of active Rheb abolished dendritic spine formation in WT neurons, whereas inactive Rheb restored spine synapse formation in Tsc2(+/-) neurons. Moreover, inactivation of Rheb with farnesyl transferase inhibitors recovered spine synapse morphogenesis in Tsc2(+/-) neurons. In conclusion, dendritic spine abnormalities in TSC neurons may be caused through activation of Rheb, but not through of mTORC1.

PMID:
24889507
PMCID:
PMC4042127
DOI:
10.1038/srep05155
[Indexed for MEDLINE]
Free PMC Article
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