mGluR7 allosteric modulator AMN082 corrects protein synthesis and pathological phenotypes in FXS

Vipendra Kumar, Kwan Young Lee, Anirudh Acharya, Matthew S. Babik, Catherine A. Christian-Hinman, Justin S. Rhodes, Nien Pei Tsai

Research output: Contribution to journalArticlepeer-review

Abstract

Fragile X syndrome (FXS) is the leading cause of inherited autism and intellectual disabilities. Aberrant protein synthesis due to the loss of fragile X messenger ribonucleoprotein (FMRP) is the major defect in FXS, leading to a plethora of cellular and behavioral abnormalities. However, no treatments are available to date. In this study, we found that activation of metabotropic glutamate receptor 7 (mGluR7) using a positive allosteric modulator named AMN082 represses protein synthesis through ERK1/2 and eIF4E signaling in an FMRP-independent manner. We further demonstrated that treatment of AMN082 leads to a reduction in neuronal excitability, which in turn ameliorates audiogenic seizure susceptibility in Fmr1 KO mice, the FXS mouse model. When evaluating the animals’ behavior, we showed that treatment of AMN082 reduces repetitive behavior and improves learning and memory in Fmr1 KO mice. This study uncovers novel functions of mGluR7 and AMN082 and suggests the activation of mGluR7 as a potential therapeutic approach for treating FXS.

Original languageEnglish (US)
Pages (from-to)506-522
Number of pages17
JournalEMBO Molecular Medicine
Volume16
Issue number3
DOIs
StatePublished - Mar 14 2024

Keywords

  • Autism
  • FMRP
  • FXS
  • Protein Synthesis
  • mGluR7

ASJC Scopus subject areas

  • Molecular Medicine

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