ALS-linked protein disulfide isomerase variants cause motor dysfunction

作者：Woehlbier Ute; Colombo Alicia; Saaranen Mirva J; Perez Viviana; Ojeda Jorge; Bustos Fernando J; Andreu Catherine I; Torres Mauricio; Valenzuela Vicente; Medinas Danilo B; Rozas Pablo; Vidal Rene L; Lopez Gonzalez Rodrigo; Salameh Johnny; Fernandez Collemann Sara; Munoz Natalia; Matus Soledad; Armisen Ricardo; Sagredo Alfredo; Palma Karina; Irrazabal Thergiory; Almeida Sandra; Gonzalez Perez Paloma; Campero Mario; Gao Fen Biao; Henny Pablo; van Zundert Brigitte

来源：The EMBO Journal, 2016, 35(8): 845-865.

DOI：10.15252/embj.201592224

• amyotrophic lateral sclerosis
• ERp57
• PDIA1
• protein disulfide isomerase

Disturbance of endoplasmic reticulum (ER) proteostasis is a common feature of amyotrophic lateral sclerosis (ALS). Protein disulfide isomerases (PDIs) are ER foldases identified as possible ALS biomarkers, as well as neuroprotective factors. However, no functional studies have addressed their impact on the disease process. Here, we functionally characterized four ALS-linked mutations recently identified in two major PDI genes, PDIA1 and PDIA3/ERp57. Phenotypic screening in zebrafish revealed that the expression of these PDI variants induce motor defects associated with a disruption of motoneuron connectivity. Similarly, the expression of mutant PDIs impaired dendritic outgrowth in motoneuron cell culture models. Cellular and biochemical studies identified distinct molecular defects underlying the pathogenicity of these PDI mutants. Finally, targeting ERp57 in the nervous system led to severe motor dysfunction in mice associated with a loss of neuromuscular synapses. This study identifies ER proteostasis imbalance as a risk factor for ALS, driving initial stages of the disease.

• 出版日期2016-4-15