DJ-1 knock-down in astrocytes impairs astrocyte-mediated neuroprotection against rotenone

Neurobiology of Disease

David A. Hinkle¹  Steven J. Mullett² 

[1] Corresponding author. 7014 BST3, 3501 Fifth Avenue, Pittsburgh, PA 15260, USA. Fax: [phone].;Department of Neurology and Pittsburgh Institute for Neurodegenerative Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA;

关键词: Astrocyte;    Glia;    Parkinson's disease;    DJ-1;    siRNA;    Rotenone;   

DOI  :  

来源: DOAJ

【 摘 要 】

Mutations that eliminate DJ-1 expression cause a familial form of Parkinson's disease (PD). In sporadic PD, and many other neurodegenerative diseases, reactive astrocytes over-express DJ-1 whereas neurons maintain its expression at non-disease levels. Since DJ-1 has neuroprotective properties, and since astrocytes are known to support and protect neurons, DJ-1 over-expression in reactive astrocytes may reflect an attempt by these cells to protect themselves and surrounding neurons against disease progression. We used neuron–astrocyte contact and non-contact co-cultures to show that DJ-1 knock-down in astrocytes impaired their neuroprotective capacity, relative to wild-type astrocytes, against the neurotoxin rotenone. Conversely, DJ-1 over-expression in astrocytes augmented their neuroprotective capacity. Experiments using astrocyte conditioned media on neuron-only cultures suggested that astrocyte-released, soluble factors were involved in the DJ-1-dependent, astrocyte-mediated neuroprotective mechanism. Our findings support the developing view that astrocytic dysfunction, in addition to neuronal dysfunction, may contribute to the progression of a variety of neurodegenerative disorders.

【 授权许可】

Unknown