Wolfram Syndrome Protein, Miner1, Regulates Sulphydryl Redox Status, the Unfolded Protein Response, and Ca2+ Homeostasis

Overview

Journal EMBO Mol Med

Specialty Molecular Biology

Date 2013 May 25

PMID 23703906

Citations 63

Authors

Sandra E Wiley

Alexander Y Andreyev

Ajit S Divakaruni

Robert Karisch

Guy Perkins

Estelle A Wall

Peter van der Geer

Yi-Fan Chen

Ting-Fen Tsai

Melvin I Simon

Benjamin G Neel

Jack E Dixon

Anne N Murphy

Affiliations

Soon will be listed here.

Abstract

Miner1 is a redox-active 2Fe2S cluster protein. Mutations in Miner1 result in Wolfram Syndrome, a metabolic disease associated with diabetes, blindness, deafness, and a shortened lifespan. Embryonic fibroblasts from Miner1(-/-) mice displayed ER stress and showed hallmarks of the unfolded protein response. In addition, loss of Miner1 caused a depletion of ER Ca(2+) stores, a dramatic increase in mitochondrial Ca(2+) load, increased reactive oxygen and nitrogen species, an increase in the GSSG/GSH and NAD(+)/NADH ratios, and an increase in the ADP/ATP ratio consistent with enhanced ATP utilization. Furthermore, mitochondria in fibroblasts lacking Miner1 displayed ultrastructural alterations, such as increased cristae density and punctate morphology, and an increase in O2 consumption. Treatment with the sulphydryl anti-oxidant N-acetylcysteine reversed the abnormalities in the Miner1 deficient cells, suggesting that sulphydryl reducing agents should be explored as a treatment for this rare genetic disease.

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