Possible mechanisms for sensorineural hearing loss and deafness in patients with propionic acidemia

详细信息    查看全文

• 作者：S. C. Grünert ; I. Bodi ; K. E. Odening
• 关键词：Propionic acidemia ; Propionic aciduria ; Hearing loss ; Long QT syndrome ; Sensorineural deafness ; KvLQT1 ; KCNE1 ; Voltage ; gated potassium channel ; Inner ear
• 刊名：Orphanet Journal of Rare Diseases
• 出版年：2017
• 出版时间：December 2017
• 年：2017
• 卷：12
• 期：1
• 全文大小：1034KB
• 刊物主题：Medicine/Public Health, general; Pharmacology/Toxicology; Human Genetics;
• 出版者：BioMed Central
• ISSN：1750-1172
• 卷排序：12

文摘

Propionic acidemia is an inborn error of metabolism caused by deficiency of the mitochondrial enzyme propionyl-CoA carboxylase. Sensorineural deafness and severe hearing loss have been described as long-term complications of this disease, however, the mechanism has not yet been elucidated. We have recently shown by patch clamping experiments and Western blots that acute and chronic effects of accumulating metabolites such as propionic acid, propionylcarnitine and methylcitrate on the KvLQT1/KCNE1 channel complex cause long QT syndrome in patients with propionic acidemia by inhibition of K+ flow via this channel. The same KvLQT1/KCNE1 channel complex is expressed in the inner ear and essential for luminal potassium secretion into the endolymphatic space. A disruption of this K+ flow results in sensorineural hearing loss or deafness. It can be assumed that acute and chronic effects of accumulating metabolites on the KvLQT1/KCNE1 channel protein may similarly cause the hearing impairment of patients with propionic acidemia.