CHIP overexpression reduces mutant androgen receptor protein and ameliorates phenotypes of the spinal and bulbar muscular atrophy transgenic mouse model.

Abstract

Spinal and bulbar muscular atrophy (SBMA) is an inherited motor neuron disease caused by the expansion of a polyglutamine tract within the androgen receptor (AR). The pathologic features of SBMA are motor neuron loss in the spinal cord and brainstem and diffuse nuclear accumulation and nuclear inclusions of the mutant AR in the residual motor neurons and certain visceral organs. Many components of the ubiquitin-proteasome and molecular chaperones are also sequestered in the inclusions, suggesting that they may be actively engaged in an attempt to degrade or refold the mutant AR. C terminus of Hsc70 (heat shock cognate protein 70)-interacting protein (CHIP), a U-box type E3 ubiquitin ligase, has been shown to interact with heat shock protein 90 (Hsp90) or Hsp70 and ubiquitylates unfolded proteins trapped by molecular chaperones and degrades them. Here, we demonstrate that transient overexpression of CHIP in a neuronal cell model reduces the monomeric mutant AR more effectively than it does the wild type, suggesting that the mutant AR is more sensitive to CHIP than is the wild type. High expression of CHIP in an SBMA transgenic mouse model also ameliorated motor symptoms and inhibited neuronal nuclear accumulation of the mutant AR. When CHIP was overexpressed in transgenic SBMA mice, mutant AR was also preferentially degraded over wild-type AR. These findings suggest that CHIP overexpression ameliorates SBMA phenotypes in mice by reducing nuclear-localized mutant AR via enhanced mutant AR degradation. Thus, CHIP overexpression would provide a potential therapeutic avenue for SBMA.

• Authors: Hiroaki Adachi, Masahiro Waza, Keisuke Tokui, Masahisa Katsuno, Makoto Minamiyama, Fumiaki Tanaka, Manabu Doyu, Gen Sobue
• Journal: The Journal of neuroscience : the official journal of the Society for Neuroscience (J Neurosci) Vol. 27 Issue 19 Pg. 5115-26 (May 09 2007) ISSN: 1529-2401 [Electronic] United States
• PMID: 17494697 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Heat-Shock Proteins
• Receptors, Androgen
• Stub1 protein, mouse
• Ubiquitin-Protein Ligases
• Proteasome Endopeptidase Complex

Topics

• Animals
• Central Nervous System (metabolism, physiopathology)
• Disease Models, Animal
• Down-Regulation (genetics)
• Female
• Gene Expression Regulation (physiology)
• Genetic Predisposition to Disease (genetics)
• Genetic Therapy (methods)
• Heat-Shock Proteins (metabolism)
• Humans
• Inclusion Bodies (genetics, metabolism)
• Intranuclear Inclusion Bodies (genetics, metabolism)
• Male
• Mice
• Mice, Transgenic
• Motor Neurons (metabolism, pathology)
• Muscular Atrophy, Spinal (genetics, metabolism, therapy)
• Mutation (genetics)
• Nerve Degeneration (genetics, metabolism, therapy)
• Phenotype
• Proteasome Endopeptidase Complex (metabolism)
• Protein Folding
• Receptors, Androgen (genetics, metabolism)
• Ubiquitin-Protein Ligases (genetics)