Lovastatin, not Simvastatin, Corrects Core Phenotypes in the Fragile X Mouse Model

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Melania Muscas1, Susana R Louros1, Emily K Osterweil2

  • 1Centre for Discovery Brain Sciences, Simons Initiative for the Developing Brain, University of Edinburgh, Edinburgh EH8 9XD, United Kingdom.

Eneuro
|June 1, 2019
PubMed

Insights

Simvastatin, a proposed alternative to lovastatin for fragile X syndrome (FX), fails to correct key neurological deficits in mouse models. Unlike lovastatin, simvastatin does not improve protein synthesis or reduce seizures in FX mice.

Area of Science:

  • Neuroscience
  • Genetics
  • Pharmacology

Background:

  • Fragile X syndrome (FX) is a genetic disorder causing autism and intellectual disability.
  • Lovastatin shows therapeutic potential for FX neurological phenotypes in animal models.
  • Simvastatin, a related drug, is considered for FX due to higher potency and brain penetration.

Purpose of the Study:

  • To compare the efficacy of lovastatin and simvastatin in correcting core FX phenotypes in mouse models.
  • To evaluate the effects of both drugs on hippocampal protein synthesis and audiogenic seizures (AGS).

Main Methods:

  • Side-by-side comparison of lovastatin and simvastatin treatments in Fmr1-/y mice (FX model) and WT littermates.
  • Assessment of hippocampal protein synthesis levels.
  • Evaluation of susceptibility to audiogenic seizures (AGSs).

Main Results:

  • Simvastatin did not correct excessive hippocampal protein synthesis in Fmr1-/y mice at any dose.
  • Simvastatin significantly increased protein synthesis in both Fmr1-/y and WT mice.
  • Simvastatin did not reduce AGS in Fmr1-/y mice, whereas lovastatin significantly reduced AGS incidence and severity.

Conclusions:

  • Simvastatin is ineffective in correcting core neurological phenotypes associated with fragile X syndrome in mouse models.
  • Lovastatin remains a potential therapeutic agent, while simvastatin does not show similar benefits for FX-related neurological deficits.
Keywords:
ERKFMR1fragile Xlovastatin

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