Amino acids levels as a potential biomarker in myasthenia gravis.

The search for new diagnostic and therapeutic approaches for myasthenia gravis (MG) is highly desirable. Therefore, the aim of the present study is to assess the profile of non-essential amino acids in the serum of MG patients. We evaluated the serum levels of non-essential amino acids in MG patients (n = 10) and control subjects (CS, n = 10) using high-performance liquid chromatography (HPLC) method and assuming a two-fold concentration difference between the groups as significant. Serum levels of aspartic acid and glutamic acid in MG patients were significantly higher than in CS. There were no significant differences in mean serum levels of glycine, proline, alanine, serine, cysteine, arginine and tyrosine between MG patients and CS. The results indicate the need for further research to assess the role of non-essential amino acids in MG. Moreover, our preliminary results suggest that the metabolism of some amino acids seems to be changed in patients with MG. Therefore, we conclude that amino acids profiling might be helpful in searching for putative biomarkers of the central nervous system diseases such as myasthenia gravis.