The Huntington's disease-related cardiomyopathy prevents a hypertrophic response in the R6/2 mouse model

PLoS One. 2014 Sep 30;9(9):e108961. doi: 10.1371/journal.pone.0108961. eCollection 2014.

Abstract

Huntington's disease (HD) is neurodegenerative disorder for which the mutation results in an extra-long tract of glutamines that causes the huntingtin protein to aggregate. It is characterized by neurological symptoms and brain pathology that is associated with nuclear and cytoplasmic aggregates and with transcriptional deregulation. Despite the fact that HD has been recognized principally as a neurological disease, there are multiple epidemiological studies showing that HD patients exhibit a high rate of cardiovascular events leading to heart failure. To unravel the mechanistic basis of cardiac dysfunction in HD, we employed a wide range of molecular techniques using the well-established genetic R6/2 mouse model that develop a considerable degree of the cardiac atrophy at end stage disease. We found that chronic treatment with isoproterenol, a potent beta-adrenoreceptor agonist, did not change the overall gross morphology of the HD murine hearts. However, there was a partial response to the beta-adrenergenic stimulation by the further re-expression of foetal genes. In addition we have profiled the expression level of Hdacs in the R6/2 murine hearts and found that the isoproterenol stimulation of Hdac expression was partially blocked. For the first time we established the Hdac transcriptional profile under hypertrophic conditions and found 10 out of 18 Hdacs to be markedly deregulated. Therefore, we conclude that R6/2 murine hearts are not able to respond to the chronic isoproterenol treatment to the same degree as wild type hearts and some of the hypertrophic signals are likely attenuated in the symptomatic HD animals.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adrenergic beta-Antagonists / pharmacology
  • Animals
  • Brain-Derived Neurotrophic Factor / metabolism
  • Cardiomyopathies / etiology
  • Cardiomyopathies / pathology*
  • Collagen Type VI / metabolism
  • Disease Models, Animal
  • Down-Regulation
  • Female
  • Heart / drug effects
  • Histone Deacetylases / metabolism
  • Huntington Disease / complications
  • Huntington Disease / pathology*
  • Hypertrophy
  • Isoproterenol / pharmacology
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Inbred DBA
  • Myocardium / pathology*

Substances

  • Adrenergic beta-Antagonists
  • Brain-Derived Neurotrophic Factor
  • Collagen Type VI
  • Histone Deacetylases
  • Isoproterenol

Grants and funding

This work was supported by the CHDI Foundation, a not-for-profit biomedical research organization exclusively dedicated to discovering and developing therapeutics that slow the progression of Huntington's disease. Research conducted at King's College London was performed in collaboration with and funded by the CHDI Foundation. In these cases, the funder, through CHDI Management, fully participated in study design, data collection and analysis, the decision to publish, and preparation of the manuscript. TM is currently an employee of Affimed Therapeutics AG. Affimed Therapeutics AG provided no support for this work. They did not provide salary support for TM when he was working at King's College London and they did not have any role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The specific roles of the authors is articulated in the ‘author contributions’ section.