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Oxidative stress involvement has been strongly hypothesized among the possible pathogenic mechanisms of motor neuron degeneration in amyotrophic lateral sclerosis (ALS). The intracellular redox balance is finely modulated by numerous complex mechanisms critical for cellular functions, among which the nuclear factor erythroid-derived 2-like 2 (NFE2L2/Nrf2) pathways.  We genotyped, in a cohort of ALS patients ( n  = 145) and healthy controls ( n  = 168), three SNPs in  Nrf2  gene promoter: −653 A/G, −651 G/A, and −617 C/A and evaluated, in a subset ( n  = 73) of patients, advanced oxidation protein products (AOPP), iron-reducing ability of plasma (FRAP), and plasma thiols (-SH) as oxidative damage peripheral biomarkers.   Nrf2  polymorphisms were not different among patients and controls. Increased levels of AOPP ( P  < 0.05) and decreased levels of FRAP ( P  < 0.001) have been observed in ALS patients compared with controls, but no difference in -SH values was found. Furthermore, no association was found between biochemical markers of redox balance and  Nrf2  polymorphisms. These data confirm an altered redox balance in ALS and indicate that, while being abnormally modified compared to controls, the oxidative stress biomarkers assessed in this study are independent from the −653 A/G, −651 G/A, and −617 C/A  Nrf2  SNPs in ALS patients.

oxidative medicine and cellular longevity

Lack of Association between Nuclear Factor Erythroid-Derived 2-Like 2 Promoter Gene Polymorphisms and Oxidative Stress Biomarkers in Amyotrophic Lateral Sclerosis Patients