Calcium dysregulation and Cdk5-ATM pathway involved in a mouse model of fragile X-associated tremor/ataxia syndrome

Gaëlle Robin, José R. López, Glenda M. Espinal, Susan Hulsizer, Paul J Hagerman, Isaac N Pessah

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Fragile X-associated tremor/ataxia syndrome (FXTAS) is a neurological disorder that affects premutation carriers with 55-200 CGG-expansion repeats (preCGG) in FMR1, presenting with early alterations in neuronal network formation and function that precede neurodegeneration. Whether intranuclear inclusions containing DNA damage response (DDR) proteins are causally linked to abnormal synaptic function, neuronal growth and survival are unknown. In a mouse that harbors a premutation CGG expansion (preCGG), cortical and hippocampal FMRP expression is moderately reduced from birth through adulthood, with greater FMRP reductions in the soma than in the neurite, despite several-fold elevation of Fmr1 mRNA levels. Resting cytoplasmic calcium concentration ([Ca2+]i) in cultured preCGG hippocampal neurons is chronically elevated, 3-fold compared to Wt; elevated ROS and abnormal glutamatergic responses are detected at 14 DIV. Elevated µ-calpain activity and a higher p25/p35 ratio in the cortex of preCGG young adult mice indicate abnormal Cdk5 regulation. In support, the Cdk5 substrate, ATM, is upregulated by 1.5- to 2-fold at P0 and 6 months in preCGG brain, as is p-Ser1981-ATM. Bax:Bcl-2 is 30% higher in preCGG brain, indicating a greater vulnerability to apoptotic activation. Elevated [Ca2+]i, ROS, and DDR signals are normalized with dantrolene. Chronic [Ca2+]i dysregulation amplifies Cdk5-ATM signaling, possibly linking impaired glutamatergic signaling and DDR to neurodegeneration in preCGG brain.

Original languageEnglish (US)
Pages (from-to)2649-2666
Number of pages18
JournalHuman Molecular Genetics
Volume26
Issue number14
DOIs
StatePublished - Jul 15 2017
Externally publishedYes

Fingerprint

DNA Damage
Calcium
Brain
Dantrolene
Intranuclear Inclusion Bodies
Calpain
Carisoprodol
Neurites
Nervous System Diseases
Young Adult
Parturition
Neurons
Messenger RNA
Growth
Fragile X Tremor Ataxia Syndrome
Proteins

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

Cite this

Calcium dysregulation and Cdk5-ATM pathway involved in a mouse model of fragile X-associated tremor/ataxia syndrome. / Robin, Gaëlle; López, José R.; Espinal, Glenda M.; Hulsizer, Susan; Hagerman, Paul J; Pessah, Isaac N.

In: Human Molecular Genetics, Vol. 26, No. 14, 15.07.2017, p. 2649-2666.

Research output: Contribution to journalArticle

Robin, Gaëlle ; López, José R. ; Espinal, Glenda M. ; Hulsizer, Susan ; Hagerman, Paul J ; Pessah, Isaac N. / Calcium dysregulation and Cdk5-ATM pathway involved in a mouse model of fragile X-associated tremor/ataxia syndrome. In: Human Molecular Genetics. 2017 ; Vol. 26, No. 14. pp. 2649-2666.
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