SREBP2 gene therapy targeting striatal astrocytes ameliorates Huntington's disease phenotypes

Giulia Birolini, Gianluca Verlengia, Francesca Talpo, Claudia Maniezzi, Lorena Zentilin, Mauro Giacca, Paola Conforti, Chiara Cordiglieri, Claudio Caccia, Valerio Leoni, Franco Taroni, Gerardo Biella, Michele Simonato, Elena Cattaneo, Marta Valenza*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Brain cholesterol is produced mainly by astrocytes and is important for neuronal function. Its biosynthesis is severely reduced in mouse models of Huntington's disease. One possible mechanism is a diminished nuclear translocation of the transcription factor sterol regulatory element-binding protein 2 (SREBP2) and, consequently, reduced activation of SREBP2-controlled genes in the cholesterol biosynthesis pathway. Here we evaluated the efficacy of a gene therapy based on the unilateral intra-striatal injection of a recombinant adeno-associated virus 2/5 (AAV2/5) targeting astrocytes specifically and carrying the transcriptionally active N-terminal fragment of human SREBP2 (hSREBP2). Robust hSREBP2 expression in striatal glial cells in R6/2 Huntington's disease mice activated the transcription of cholesterol biosynthesis pathway genes, restored synaptic transmission, reversed dopamine receptor D2 (Drd2) transcript levels decline, cleared mutant huntingtin aggregates and attenuated behavioural deficits. We conclude that glial SREBP2 participates in Huntington's disease brain pathogenesis in vivo and that AAV-based delivery of SREBP2 to astrocytes counteracts key features of the disease.

Original languageEnglish
Pages (from-to)3175-3190
Number of pages16
JournalBrain
Volume144
Issue number10
DOIs
Publication statusPublished - 1 Oct 2021

Keywords

  • Astrocytes
  • Cholesterol
  • Huntington's disease
  • SREBP2

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