title: Age-Dependent Resistance to Excitotoxicity in Htt CAG140 Mice and the Effect of Strain Background.
abstract: Mouse strain background can influence vulnerability to excitotoxic neuronal cell death and potentially modulate phenotypes in transgenic mouse models of human disease. Evidence supports a contribution of excitotoxicity to the selective death of medium spiny neurons in Huntington's disease (HD). Here, we assess whether strain differences in excitotoxic vulnerability influence striatal cell death in a knock-in mouse model of HD. Previous studies that evaluated resistance to excitotoxic lesions in several mouse models of HD had variable outcomes. In the present study, we directly compare one model on two different background strains to test the contribution of strain to excitotoxicity-mediated neurodegeneration. Mice of the FVB/N strain, which are highly vulnerable to excitotoxicity, become extremely resistant to quinolinic acid-induced striatal neurodegeneration with age, when carrying a huntingtin (Htt) allele expressing a HD transgene (CAG140). The resistance is much greater than the age-dependent resistance that has been previously reported in YAC128 mice. By 12 months of age, both heterozygous and homozygous FVB.CAG140 mice displayed virtually complete resistance to quinolinic acid-induced striatal neurodegeneration. A similar resistance develops in CAG140 mice on a C57BL/6N background although the effect size is smaller because C57BL/6N mice are already resistant due to genetic background. In a direct comparison with the YAC128 mice, FVB.CAG140 mice have greater resistance. FVB.CAG140 mice are also resistant to neurodegeneration following kainic acid-induced status epilepticus suggesting the existence of a common cellular mechanism that provides protection against multiple types of excitotoxic insult. These findings establish FVB.CAG140 mice as a useful model to investigate the cellular and molecular mechanisms that confer neuroprotection against excitotoxicity.
authors.affiliation: Department of Anatomy and Neurobiology, University of California Irvine, Irvine, CA, USA.
authors.forename: Melissa K
authors.initials: MK
authors.lastname: Strong
authors.forename: Amber L
authors.initials: AL
authors.lastname: Southwell
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Yonan
authors.forename: Michael R
authors.initials: MR
authors.lastname: Hayden
authors.forename: Grant R
authors.initials: GR
authors.lastname: Macgregor
authors.forename: Leslie M
authors.initials: LM
authors.lastname: Thompson
authors.forename: Oswald
authors.initials: O
authors.lastname: Steward
mesh_terms: D000375:Aging / Q000473:pathology*; D000818:Animals; D003342:Corpus Striatum / Q000187:drug effects* / Q000473:pathology*; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D000071058:Huntingtin Protein; D006816:Huntington Disease / Q000139:chemically induced / Q000473:pathology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic; D009419:Nerve Tissue Proteins / Q000235:genetics; D009687:Nuclear Proteins / Q000235:genetics; D017378:Quinolinic Acid; D013045:Species Specificity
chemical_list: C506812:Htt protein, mouse; D000071058:Huntingtin Protein; D009419:Nerve Tissue Proteins; D009687:Nuclear Proteins; D017378:Quinolinic Acid
keywords: Excitotoxin; Huntington’s disease; cell death; genetic background; inbred mouse strains; neurodegeneration; resistance