title: Inhibition of polyglutamine aggregation in R6/2 HD brain slices-complex dose-response profiles.
abstract: Huntington's disease (HD) is a late onset neurodegenerative disorder caused by a CAG/polyglutamine (polyQ) repeat expansion. PolyQ aggregates can be detected in the nuclei and processes of neurons in HD patients and mouse models prior to the onset of symptoms. The misfolding and aggregation pathway is an important therapeutic target. To better test the efficacy of aggregation inhibitors, we have developed an organotypic slice culture system. We show here that the formation of polyQ aggregates in hippocampal slices established from the R6/2 mouse follows the same prescribed sequence as occurs in vivo. Using this assay, we show that Congo red and chrysamine G can modulate aggregate formation, but show complex dose-response curves. Oral administration of creatine has been shown to delay the onset of all aspects of the phenotype and neuropathology in R6/2 mice. We show here that creatine can similarly inhibit aggregate formation in the slice culture assay.
authors.affiliation: Division of Medical and Molecular Genetics, GKT School of Medicine, London, United Kingdom
authors.forename: D L
authors.initials: DL
authors.lastname: Smith
authors.forename: R
authors.initials: R
authors.lastname: Portier
authors.forename: B
authors.initials: B
authors.lastname: Woodman
authors.forename: E
authors.initials: E
authors.lastname: Hockly
authors.forename: A
authors.initials: A
authors.lastname: Mahal
authors.forename: W E
authors.initials: WE
authors.lastname: Klunk
authors.forename: X J
authors.initials: XJ
authors.lastname: Li
authors.forename: E
authors.initials: E
authors.lastname: Wanker
authors.forename: K D
authors.initials: KD
authors.lastname: Murray
authors.forename: G P
authors.initials: GP
authors.lastname: Bates
mesh_terms: D000818:Animals; D001565:Benzoates / Q000494:pharmacology; D001713:Biphenyl Compounds / Q000494:pharmacology; D002478:Cells, Cultured; D004396:Coloring Agents / Q000494:pharmacology; D003224:Congo Red / Q000494:pharmacology; D003401:Creatine / Q000494:pharmacology; D003546:Cysteine Endopeptidases / Q000187:drug effects / Q000378:metabolism; D004195:Disease Models, Animal; D004305:Dose-Response Relationship, Drug; D004353:Drug Evaluation, Preclinical; D004734:Energy Metabolism / Q000187:drug effects / Q000502:physiology; D005260:Female; D006624:Hippocampus / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D000071058:Huntingtin Protein; D006816:Huntington Disease / Q000188:drug therapy* / Q000235:genetics / Q000378:metabolism; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D009097:Multienzyme Complexes / Q000187:drug effects / Q000378:metabolism; D009419:Nerve Tissue Proteins / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D009474:Neurons / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D018696:Neuroprotective Agents / Q000494:pharmacology*; D009687:Nuclear Proteins / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D009924:Organ Culture Techniques; D010455:Peptides / Q000187:drug effects* / Q000235:genetics / Q000378:metabolism; D046988:Proteasome Endopeptidase Complex; D017510:Protein Folding; D019680:Trinucleotide Repeat Expansion / Q000187:drug effects* / Q000235:genetics; D025801:Ubiquitin / Q000187:drug effects / Q000235:genetics / Q000378:metabolism
chemical_list: D001565:Benzoates; D001713:Biphenyl Compounds; D004396:Coloring Agents; C506812:Htt protein, mouse; D000071058:Huntingtin Protein; D009097:Multienzyme Complexes; D009419:Nerve Tissue Proteins; D018696:Neuroprotective Agents; D009687:Nuclear Proteins; D010455:Peptides; D025801:Ubiquitin; C097188:polyglutamine; D003224:Congo Red; C092559:chrysamine G; D003546:Cysteine Endopeptidases; D046988:Proteasome Endopeptidase Complex; D003401:Creatine