Cytochrome c oxidase deficiency detection in human fibroblasts using scanning electrochemical microscopy

• 成果类型: Article
• 署名作者: Thind, Shubhneet; Lima, Dhesmon; Booy, Evan; Trinh, Dao; McKenna, Sean A.; Kuss, Sabine
• 署名单位: University of Manitoba; University of Manitoba; La Rochelle Universite; Centre National de la Recherche Scientifique (CNRS)
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-10070
• DOI: 10.1073/pnas.2310288120
• 发表日期: 2024-01-02
• 关键词: mitochondrial disease; native-electrophoresis; multidrug-resistance; bovine heart; mutations; sco1; complexes; diagnosis; glucose; muscle

摘要

Cytochrome c oxidase deficiency (COXD) is an inherited disorder characterized by the absence or mutation in the genes encoding for the cytochrome c oxidase protein (COX). COX deficiency results in severe muscle weakness, heart, liver, and kidney disorders, as well as brain damage in infants and adolescents, leading to death in many cases. With no cure for this disorder, finding an efficient, inexpensive, and early means of diagnosis is essential to minimize symptoms and long -term disabilities. Furthermore, muscle biopsy, the traditional detection method, is invasive, expensive, and time- consuming. This study demonstrates the applicability of scanning electrochemical microscopy to quantify COX activity in living human fibroblast cells. Taking advantage of the interaction between the redox mediator N, N, N ', N '-tetramethyl-para-phenylene-diamine, and COX, the enzymatic activity was successfully quantified by monitoring current changes using a platinum microelectrode and determining the apparent heterogeneous rate constant k0 using numerical modeling. This study provides a foundation for developing a diagnostic method for detecting COXD in infants, which has the potential to increase treatment effectiveness and improve the quality of life of affected individuals.