Up-regulation of c-Jun N-terminal kinase pathway in Friedreich's ataxia cells.

Abstract:

:The severe reduction in mRNA and protein levels of the mitochondrial protein frataxin, encoded by the X25 gene, causes Friedreich ataxia (FRDA), the most common form of recessive hereditary ataxia. Increasing evidence underlines the pathogenetic role of oxidative stress in this disease. We generated an in vitro cellular model of regulated human frataxin overexpression. We identified, by differential display technique, the mitogen activated protein kinase kinase 4 mRNA down regulation in frataxin overexpressing cells. We studied the stress kinases pathway in this cellular model and in fibroblasts from FRDA patients. Frataxin overexpression reduced c-Jun N-terminal kinase phosphorylation. Furthermore, exposure of FRDA fibroblasts to several forms of environmental stress caused an up regulation of phospho-JNK and phospho-c-Jun. To understand if this susceptibility results in cell death, we have investigated the involvement of caspases. A significantly higher activation of caspase-9 was observed in FRDA versus control fibroblasts after serum-withdrawal. Our findings suggest the presence, in FRDA patient cells, of a 'hyperactive' stress signaling pathway. The role of frataxin in FRDA pathogenesis could be explained, at least in part, by this hyperactivity.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Pianese L,Busino L,De Biase I,De Cristofaro T,Lo Casale MS,Giuliano P,Monticelli A,Turano M,Criscuolo C,Filla A,Varrone S,Cocozza S

doi

10.1093/hmg/11.23.2989

subject

Has Abstract

pub_date

2002-11-01 00:00:00

pages

2989-96

issue

23

eissn

0964-6906

issn

1460-2083

journal_volume

11

pub_type

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