Cited by 165Tuberous Sclerosis Complex ResearchPI3K/AKT/mTOR signaling in cancerEndoplasmic Reticulum Stress and Disease

Tuberous Sclerosis Complex Activity Is Required to Control Neuronal Stress Responses in an mTOR-Dependent Manner

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Di Nardo, Alessia, Kramvis, Ioannis, Cho, Namjik, Sadowski, Abbey, Meikle, Lynsey, Kwiatkowski, David J., Sahin, Mustafa·2009·The Journal of Neuroscience

Abstract

Tuberous sclerosis complex (TSC) is a neurogenetic disorder caused by loss-of-function mutations in either the TSC1 or TSC2 genes and frequently results in prominent CNS manifestations, including epilepsy, mental retardation, and autism spectrum disorder. The TSC1/TSC2 protein complex plays a major role in controlling the Ser/Thr kinase mammalian target of rapamycin (mTOR), which is a master regulator of protein synthesis and cell growth. In this study, we show that endoplasmic reticulum (ER) stress regulates TSC1/TSC2 complex to limit mTOR activity. In addition, Tsc2-deficient rat hippocampal neurons and brain lysates from a Tsc1-deficient mouse model demonstrate both elevated ER and oxidative stress. In Tsc2-deficient neurons, the expression of stress markers such as CHOP and HO-1 is increased, and this increase is completely reversed by the mTOR inhibitor rapamycin both in vitro and in vivo. Neurons lacking a functional TSC1/TSC2 complex have increased vulnerability to ER stress-induced cell death via the activation of the mitochondrial death pathway. Importantly, knockdown of CHOP reduces oxidative stress and apoptosis in Tsc2-deficient neurons. These observations indicate that ER stress modulates mTOR activity through the TSC protein complex and that ER stress is elevated in cells lacking this complex. They also suggest that some of the neuronal dysfunction and neurocognitive deficits seen in TSC patients may be attributable to ER and oxidative stress and therefore potentially responsive to agents moderating these pathways.

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Authors
Di Nardo, A., Kramvis, I., Cho, N., Sadowski, A., Meikle, L., Kwiatkowski, D. J., & Sahin, M.
Affiliations
  • Boston Children's Hospital (US)
  • Brigham and Women's Hospital (US)
Venue
The Journal of Neuroscience
Published
2009-05-06
Volume
29
Issue
18
Pages
5926-5937
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2002327194
Cited by
165
References
69
Citations by year
2026: 3 · 2025: 2 · 2024: 3 · 2023: 4 · 2022: 7 · 2021: 12 · 2020: 6 · 2019: 9 · 2018: 8 · 2017: 10 · 2016: 14 · 2015: 9 · 2014: 10 · 2013: 14 · 2012: 24
FWCI
11.97
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
Funders
  • Tuberous Sclerosis Alliance
  • Manton Foundation
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (R01NS058956, P01NS024279)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (P30HD018655)
Topics
  • Health Sciences › Medicine › Physiology › Tuberous Sclerosis Complex Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
Keywords
tuberous sclerosis complex, TSC1, TSC2, mTOR, endoplasmic reticulum stress, oxidative stress, neuronal stress response, CHOP, heme oxygenase-1, mitochondrial apoptosis, ER stress-induced cell death, hippocampal neurons, rapamycin, neurocognitive impairment
MeSH terms
Tuberous Sclerosis Complex 1 Protein, Tuberous Sclerosis Complex 2 Protein, Animals, Animals, Newborn, Carrier Proteins, Cells, Cultured, Child, Preschool, Dose-Response Relationship, Drug, Embryo, Mammalian, Endoplasmic Reticulum, Flow Cytometry, Gene Expression Regulation, Hippocampus, Humans, Lactones, Male, Mice, Transgenic, Mitochondria, Neurons, Serine, Sesquiterpenes, Threonine, Time Factors, Transduction, Genetic, Tuberous Sclerosis, Tunicamycin, Apoptosis, Reactive Oxygen Species, Phosphotransferases (Alcohol Group Acceptor), Oxidative Stress, Tumor Suppressor Proteins, RNA, Small Interfering, Mice, Heme Oxygenase-1, Transcription Factor CHOP, TOR Serine-Threonine Kinases

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