Relationship between thiol-disulphide homeostasis and visual evoked potentials in patients with multiple sclerosis
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To examine the thiol-disulphide homeostasis during an optic neuritis episode in patients with multiple sclerosis and the relationship between this homeostasis and P100 wave latency.
Materials and method
Visual evoked potential reviews of multiple sclerosis patients who presented with an optic neuritis episode were conducted and P100 latencies were measured. Peripheral blood samples were collected from all patients. Native thiol and total thiol concentrations were measured with the automated method that was recently developed. Their amount of disulphide bonds, disulphide/native thiol, disulphide/total thiol and native thiol/total thiol ratios were calculated. The relationship between P100 latency and thiol-disulphide homeostasis was investigated.
A significant positive correlation was determined between the disulphide/native thiol ratio and both mean P100 latency and maximum P100 latency (p = 0.021, r = 0.136; p = 0.030, r = 0.177, respectively).
As the balance of the plasma dominated by antioxidants moves towards the oxidant side, in other words as a higher rate of thiol is oxidised from the thiol pool, P100 latency is extended. N-acetylcysteine and alpha lipoic acid as well as thiol supplements can improve the thiol-disulphide balance, reinforce antioxidant defence and it can help in slowing down the demyelinating damage.
KeywordsMultiple sclerosis Optic neuritis Thiol-disulphide homeostasis Oxidative stress Visual evoked potential
The biochemical analysis of the study was performed at the biochemistry lab of Ataturk Education and Research Hospital. The authors would like to express their thanks to the staff of the biochemistry lab and Özcan Erel’s research assistants for the invaluable assistance, as well as MAT Statistical Analysis Service that conducted the statistical analysis of the study.
Compliance with ethical standards
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Conflict of interest
The authors declare that they have no conflicts of interest.
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