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High serum adenosine deaminase activity and its correlation with lymphocyte subsets in myasthenia gravis
S Chiba1, H Matsumoto, Y Motoi
1Department of Rehabilitation and Neurology, Sapporo Medical College, Japan.
Abstract:
Serum adenosine deaminase (ADA) activity and peripheral lymphocyte subsets of patients with myasthenia gravis (MG) were simultaneously measured. The ADA activity in MG (n = 30) was significantly higher as compared with normal control (n = 150) and multiple sclerosis (n = 12) (P less than 0.05). The ADA activity of generalized MG was higher than that of ocular MG, while a significant elevation of ADA activity was observed in grade IIB as compared with grade I of Osserman's classification (P less than 0.05). A trend of high ADA activity was demonstrated in those whose disease had advanced to a severe degree associated with unstable clinical features (P less than 0.05). In addition, there was a significant elevation of ADA activity in patients who disclosed positive anti-Ach-receptor-antibody as compared with negative one (P less than 0.05). There was no specific trend among the proportions of the subsets of peripheral lymphocytes which could reflect the severity of MG, however, the proportion of OK Ia1+ tended to be higher with advancing the grade of MG. Interestingly enough, a close correlation was found between the ADA activity and the proportion of OK Ia1+ cells (P less than 0.05). From the above results, it was concluded that high ADA may be responsible for the pathophysiology of MG through the alteration of peripheral lymphocyte function.
Insights
Serum adenosine deaminase (ADA) activity is elevated in myasthenia gravis (MG) patients, correlating with disease severity and anti-acetylcholine receptor antibodies. This suggests ADA may impact MG pathophysiology by altering lymphocyte function.
Area of Science:
- Immunology
- Neurology
- Biochemistry
Background:
- Myasthenia gravis (MG) is an autoimmune disorder affecting neuromuscular junctions.
- Adenosine deaminase (ADA) is an enzyme involved in purine metabolism and immune cell function.
Purpose of the Study:
- To investigate serum ADA activity and peripheral lymphocyte subsets in MG patients.
- To explore the relationship between ADA activity, disease severity, and immunological markers in MG.
Main Methods:
- Simultaneous measurement of serum ADA activity and peripheral lymphocyte subsets in MG patients (n=30), normal controls (n=150), and multiple sclerosis patients (n=12).
- Correlation analysis between ADA activity, MG clinical grades (Osserman's classification), and anti-acetylcholine receptor antibody status.
Main Results:
- Serum ADA activity was significantly higher in MG patients compared to controls (P < 0.05).
- Elevated ADA activity correlated with generalized MG, higher clinical grades (IIB vs. I), severe disease, and positive anti-acetylcholine receptor antibodies (P < 0.05).
- A positive correlation was observed between ADA activity and the proportion of OK Ia1+ cells (P < 0.05), although other lymphocyte subsets showed no specific trend related to MG severity.
Conclusions:
- Elevated serum ADA activity is a characteristic finding in myasthenia gravis.
- High ADA activity may contribute to MG pathophysiology by influencing peripheral lymphocyte function and potentially impacting disease severity.
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