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J. Clin. Med. 2018, 7(2), 36; https://doi.org/10.3390/jcm7020036

Blood Mononuclear Cell Mitochondrial Respiratory Chain Complex IV Activity is Decreased in Multiple Sclerosis Patients: Effects of β-Interferon Treatment

1
Neurometabolic Unit, National Hospital, Queen Square, London WC1N 3BG, UK
2
Department of Pharmacy and Biomolecular Science, Liverpool John Moores University, Byrom Street, Liverpool L3 5UA, UK
3
Institute of Medical Sciences, University of Aberdeen, Scotland AB24 3FX, UK
4
UCL Great Ormond Street Institute of Child Health, University College London, London WC1E 6BT, UK
*
Authors to whom correspondence should be addressed.
Received: 1 February 2018 / Revised: 15 February 2018 / Accepted: 18 February 2018 / Published: 20 February 2018
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Abstract

Objectives: Evidence of mitochondrial respiratory chain (MRC) dysfunction and oxidative stress has been implicated in the pathophysiology of multiple sclerosis (MS). However, at present, there is no reliable low invasive surrogate available to evaluate mitochondrial function in these patients. In view of the particular sensitivity of MRC complex IV to oxidative stress, the aim of this study was to assess blood mononuclear cell (BMNC) MRC complex IV activity in MS patients and compare these results to age matched controls and MS patients on β-interferon treatment. Methods: Spectrophotometric enzyme assay was employed to measure MRC complex IV activity in blood mononuclear cell obtained multiple sclerosis patients and aged matched controls. Results: MRC Complex IV activity was found to be significantly decreased (p < 0.05) in MS patients (2.1 ± 0.8 k/nmol × 10−3; mean ± SD] when compared to the controls (7.2 ± 2.3 k/nmol × 10−3). Complex IV activity in MS patients on β-interferon (4.9 ± 1.5 k/nmol × 10−3) was not found to be significantly different from that of the controls. Conclusions: This study has indicated evidence of peripheral MRC complex IV deficiency in MS patients and has highlighted the potential utility of BMNCs as a potential means to evaluate mitochondrial function in this disorder. Furthermore, the reported improvement of complex IV activity may provide novel insights into the mode(s) of action of β-interferon. View Full-Text
Keywords: mitochondrial respiratory chain; complex IV; blood mononuclear cells; multiple sclerosis; β-Interferon mitochondrial respiratory chain; complex IV; blood mononuclear cells; multiple sclerosis; β-Interferon
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Hargreaves, I.; Mody, N.; Land, J.; Heales, S. Blood Mononuclear Cell Mitochondrial Respiratory Chain Complex IV Activity is Decreased in Multiple Sclerosis Patients: Effects of β-Interferon Treatment. J. Clin. Med. 2018, 7, 36.

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