Genetic inactivation of mGlu5 receptor improves motor coordination in the Grm1crv4 mouse model of SCAR13 ataxia

Simone Bossi, Ilaria Musante, Tommaso Bonfiglio, Tiziana Bonifacino, Laura Emionite, Maria Cerminara, Chiara Cervetto, Manuela Marcoli, Giambattista Bonanno, Roberto Ravazzolo, Anna Pittaluga, Aldamaria Puliti

Research output: Contribution to journalArticle

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Abstract

Deleterious mutations in the glutamate receptor metabotropic 1 gene (GRM1) cause a recessive form of cerebellar ataxia, SCAR13. GRM1 and GRM5 code for the metabotropic glutamate type 1 (mGlu1) and type 5 (mGlu5) receptors, respectively. Their different expression profiles suggest they could have distinct functional roles. In a previous study, homozygous mice lacking mGlu1 receptors (Grm1crv4/crv4) and exhibiting ataxia presented cerebellar overexpression of mGlu5 receptors, that was proposed to contribute to the mouse phenotype. To test this hypothesis, we here crossed Grm1crv4 and Grm5ko mice to generate double mutants (Grm1crv4/crv4Grm5ko/ko) lacking both mGlu1 and mGlu5 receptors. Double mutants and control mice were analyzed for spontaneous behavior and for motor activity by rotarod and footprint analyses. In the same mice, the release of glutamate from cerebellar nerve endings (synaptosomes) elicited by 12 mM KCl or by α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) was also evaluated. Motor coordination resulted improved in double mutants when compared to Grm1crv4/crv4 mice. Furthermore, in in vitro studies, glutamate release elicited by both KCl depolarization and activation of AMPA autoreceptors resulted reduced in Grm1crv4/crv4 mice compared to wild type mice, while it presented normal levels in double mutants. Moreover, we found that Grm1crv4/crv4 mice showed reduced expression of GluA2/3 AMPA receptor subunits in cerebellar synaptosomes, while it resulted restored to wild type level in double mutants. To conclude, blocking of mGlu5 receptor reduced the dysregulation of glutamate transmission and improved motor coordination in the Grm1crv4 mouse model of SCAR13, thus suggesting the possible usefulness of pharmacological therapies based on modulation of mGlu5 receptor activity for the treatment of this type of ataxia.

Original languageEnglish
Pages (from-to)44-53
Number of pages10
JournalNeurobiology of Disease
Volume109
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Ataxia
Glutamic Acid
Cerebellar Ataxia
alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid
Synaptosomes
Metabotropic Glutamate 5 Receptor
Isoxazoles
Autoreceptors
AMPA Receptors
Nerve Endings
Genes
Motor Activity
Pharmacology
Phenotype
Mutation

Keywords

  • AMPA receptors
  • Ataxia
  • Double mutant mice
  • Evoked glutamate release
  • Grm1 mouse
  • mGlu1 receptor
  • mGlu5 receptor
  • Mouse behavior analysis
  • Phenotype rescue

ASJC Scopus subject areas

  • Neurology

Cite this

Genetic inactivation of mGlu5 receptor improves motor coordination in the Grm1crv4 mouse model of SCAR13 ataxia. / Bossi, Simone; Musante, Ilaria; Bonfiglio, Tommaso; Bonifacino, Tiziana; Emionite, Laura; Cerminara, Maria; Cervetto, Chiara; Marcoli, Manuela; Bonanno, Giambattista; Ravazzolo, Roberto; Pittaluga, Anna; Puliti, Aldamaria.

In: Neurobiology of Disease, Vol. 109, 01.01.2018, p. 44-53.

Research output: Contribution to journalArticle

Bossi, S, Musante, I, Bonfiglio, T, Bonifacino, T, Emionite, L, Cerminara, M, Cervetto, C, Marcoli, M, Bonanno, G, Ravazzolo, R, Pittaluga, A & Puliti, A 2018, 'Genetic inactivation of mGlu5 receptor improves motor coordination in the Grm1crv4 mouse model of SCAR13 ataxia', Neurobiology of Disease, vol. 109, pp. 44-53. https://doi.org/10.1016/j.nbd.2017.10.001
Bossi, Simone ; Musante, Ilaria ; Bonfiglio, Tommaso ; Bonifacino, Tiziana ; Emionite, Laura ; Cerminara, Maria ; Cervetto, Chiara ; Marcoli, Manuela ; Bonanno, Giambattista ; Ravazzolo, Roberto ; Pittaluga, Anna ; Puliti, Aldamaria. / Genetic inactivation of mGlu5 receptor improves motor coordination in the Grm1crv4 mouse model of SCAR13 ataxia. In: Neurobiology of Disease. 2018 ; Vol. 109. pp. 44-53.
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