The A2A adenosine receptor rescues the urea cycle deficiency of Huntington's disease by enhancing the activity of the ubiquitin-proteasome system

Ming Chang Chiang, Hui Mei Chen, Hsing Lin Lai, Hsiao Wen Chen, Szu Yi Chou, Chiung Mei Chen, Fuu Jen Tsai, Yijuang Chern

研究成果: 雜誌貢獻文章同行評審

59 引文 斯高帕斯(Scopus)

摘要

Huntington's disease (HD) is an autosomal dominant neurodegenerative disease caused by a CAG trinucleotide expansion in the Huntingtin (Htt) gene. The resultant mutant Htt protein (mHtt) forms aggregates in the brain and several peripheral tissues (e.g. the liver) and causes devastating neuronal degeneration. Metabolic defects resulting from Htt aggregates in peripheral tissues also contribute to HD pathogenesis. Simultaneous improvement of defects in both the CNS and peripheral tissues is thus the most effective therapeutic strategy and is highly desirable. We earlier showed that an agonist of the A2A adenosine receptor (A2A receptor), CGS21680 (CGS), attenuates neuronal symptoms of HD. We found herein that the A2A receptor also exists in the liver, and that CGS ameliorated the urea cycle deficiency by reducing mHtt aggregates in the liver. By suppressing aggregate formation, CGS slowed the hijacking of a crucial transcription factor (HSF1) and two protein chaperons (Hsp27 and Hsp70) into hepatic Htt aggregates. Moreover, the abnormally high levels of high-molecular-mass ubiquitin conjugates in the liver of an HD mouse model (R6/2) were also ameliorated by CGS. The protective effect of CGS against mHtt-induced aggregate formation was reproduced in two cells lines and was prevented by an antagonist of the A2A receptor and a protein kinase A (PKA) inhibitor. Most importantly, the mHtt-induced suppression of proteasome activity was also normalized by CGS through PKA. Our findings reveal a novel therapeutic pathway of A2A receptors in HD and further strengthen the concept that the A2A receptor can be a drug target in treating HD.
原文英語
頁(從 - 到)2929-2942
頁數14
期刊Human Molecular Genetics
18
發行號16
DOIs
出版狀態已發佈 - 2009
對外發佈Yes

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Genetics(clinical)

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