Cholesterol defect is marked across multiple rodent models of Huntington's disease and is manifest in astrocytes

Marta Valenza, Valerio Leoni, Joanna M. Karasinska, Lara Petricca, Jianjia Fan, Jeffrey Carroll, Mahmoud A. Pouladi, Elisa Fossale, Huu Phuc Nguyen, Olaf Riess, Marcy MacDonald, Cheryl Wellington, Stefano DiDonato, Michael Hayden, Elena Cattaneo

Research output: Contribution to journalArticlepeer-review

Abstract

Brain cholesterol, which is synthesized locally, is a major component of myelin and cell membranes and participates in neuronal functions, such as membrane trafficking, signal transduction, neurotransmitter release, and synaptogenesis. Here we show that brain cholesterol biosynthesis is reduced in multiple transgenic and knock-in Huntington's disease (HD) rodent models, arguably dependent on deficits in mutant astrocytes. Mice carrying a progressively increased number of CAG repeats show a more evident reduction in cholesterol biosynthesis. In postnatal life, the cholesterol-dependent activities of neurons mainly rely on the transport of cholesterol from astrocytes on ApoE-containing particles. Our data show that mRNA levels of cholesterol biosynthesis and efflux genes are severely reduced in primary H Dastrocytes, along with impaired cellular production and secretion of ApoE. Consistently, in CSF of HD mice, ApoE is mostly associated with smaller lipoproteins, indicating reduced cholesterol transport on ApoE-containing lipoproteins circulating in the HD brain. These findings indicate that cholesterol defect is robustly marked in HD animals, implying that strategies aimed at selectively modulating brain cholesterol metabolism might be of therapeutic significance.

Original languageEnglish
Pages (from-to)10844-10850
Number of pages7
JournalJournal of Neuroscience
Volume30
Issue number32
DOIs
Publication statusPublished - Aug 11 2010

ASJC Scopus subject areas

  • Neuroscience(all)
  • Medicine(all)

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