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Clinical significance of detection of antibodies to fetal and adult acetylcholine receptors in myasthenia gravis

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Abstract

Objective

To evaluate the frequency, distribution and clinical significance of the antibodies to the fetal and/or adult acetylcholine receptor (AChR) in patients with myasthenia gravis (MG).

Methods

AChR antibodies were detected by cell-based assay in the serum of ocular MG (OMG) (n = 90) and generalized MG (GMG) patients (n = 110). The fetaltype (2α: β: Γ: δ) and adult-type (2α: β: ɛ: δ) AChR were used as antigens, and their relevance to disease presentation was assessed.

Results

The overall frequencies of anti-adult and anti-fetal AChR antibodies were similar in all 200 patients examined, with 14 having serum specific to the AChR-Γ subunit, and 22 to the AChR-ɛ subunit. The overall sensitivity when using the fetal and adult AChR antibodies was higher than that when using the fetal AChR antibody only (P = 0.015). Compared with OMG patients, the mean age at disease onset and the positive ratio of antibodies to both isoforms of the AChR were significantly higher in patients who subsequently progressed to GMG. Older patients and patients with both anti-fetal and anti-adult AChR antibodies had a greater risk for developing generalized disease [odds ratio (OR), 1.03; 95% confidence interval (CI), 1.01–1.06 and OR, 5.09; 95% CI, 2.23–11.62].

Conclusion

Using both fetal- and adult-type AChRs as the antigens may be more sensitive than using either subtype. Patients with serum specific to both isoforms are at a greater risk of progressing to GMG. Patients with disease onset at an advanced age appear to have a higher frequency of GMG conversion.

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Authors and Affiliations

  1. Department of Neurology and Tianjin Neurological Institute, Tianjin Medical University General Hospital, Tianjin, 300052, China

    Qi-Guang Shi, Zhi-Hong Wang, Xiao-Wei Ma, Da-Qi Zhang, Chun-Sheng Yang, Fu-Dong Shi & Li Yang

  2. Department of Neurology, Barrow Neurological Institute, St. Joseph’s Hospital and Medical Center, Phoenix, Arizona, 85013, USA

    Fu-Dong Shi

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  1. Qi-Guang Shi
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  2. Zhi-Hong Wang
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  4. Da-Qi Zhang
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  5. Chun-Sheng Yang
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  6. Fu-Dong Shi
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  7. Li Yang
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Correspondence to Li Yang.

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These authors contributed equally to this work.

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Shi, QG., Wang, ZH., Ma, XW. et al. Clinical significance of detection of antibodies to fetal and adult acetylcholine receptors in myasthenia gravis. Neurosci. Bull. 28, 469–474 (2012). https://doi.org/10.1007/s12264-012-1256-0

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  • DOI: https://doi.org/10.1007/s12264-012-1256-0

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