HDAC6 inhibition induces mitochondrial fusion, autophagic flux and reduces diffuse mutant huntingtin in striatal neurons

BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR BASIS OF DISEASE

卷:1852

Article

Guedes-Dias, Pedro^1,2  de Proenca, Joao¹  Soares, Tania R.¹  Leitao-Rocha, Ana¹  Pinho, Brigida R.¹  Duchen, Michael R.²  Oliveira, Jorge M. A.¹ 

[1] Univ Porto, Fac Pharm, Dept Drug Sci, REQUIMTE LAQV, P-4050313 Oporto, Portugal

[2] UCL, Dept Cell & Dev Biol, London WC1E 6BT, England

关键词: HDAC6;    Mitochondria;    Autophagy;    Huntingtin;    Huntington's disease;    Neurodegeneration;   

DOI  :  10.1016/j.bbadis.2015.08.012

来源: Elsevier

【 摘 要 】

Striatal neurons are vulnerable to Huntington's disease (HD). Decreased levels of acetylated alpha-tubulin and impaired mitochondrial dynamics, such as reduced motility and excessive fission, are associated with HD; however, it remains unclear whether and how these factors might contribute to the preferential degeneration of striatal neurons. Inhibition of the alpha-tubulin deacetylase HDAC6 has been proposed as a therapeutic strategy for HD, but remains controversial - studies in neurons show improved intracellular transport, whereas studies in cell-lines suggest it may impair autophagosome-lysosome fusion, and reduce clearance of mutant huntingtin (mHtt) and damaged mitochondria (mitophagy). Using primary cultures of rat striatal and cortical neurons, we show that mitochondria are intrinsically less motile and more balanced towards fission in striatal than in cortical neurons. Pharmacological inhibition of the HDAC6 deacetylase activity with tubastatin A (TBA) increased acetylated alpha-tubulin levels, and induced mitochondrial motility and fusion in striatal neurons to levels observed in cortical neurons. Importantly, TBA did not block neuronal autophagosome-lysosome fusion, and did not change mitochondrial DNA levels, suggesting no impairment in autophagy or mitochondrial clearance. Instead, TBA increased autophagic flux and reduced diffuse mHtt in striatal neurons, possibly by promoting transport of initiation factors to sites of autophagosomal biogenesis. This study identifies the pharmacological inhibition of HDAC6 deacetylase activity as a potential strategy to reduce the vulnerability of striatal neurons to HD. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free