Abstract
The calcium channel may be an important target in the autoimmune pathogenesis of dilated cardiomyopathy (DCM). The presence and function of serum autoantibodies against calcium channels (CC-AAbs) in patients with DCM were studied. Calcium-channel AAbs were detected in 80 patients with DCM and 80 controls by enzyme-linked immunosorbent assay (ELISA). Calcium-channel AAbs were further purified by affinity chromatography for characterization by immunoblotting and immunofluorescence. Voltage-clamp experiments were performed to identify the function of CC-AAbs. The presence of CC-AAbs was shown effectively by ELISA, and CC-AAbs were able specifically to bind to the calcium channel on the myocyte, confirmed by immunoblotting and immunofluorescence. Calcium currents were enhanced by CC-AAbs on Xenopus oocytes expressing human CaV1.2 channels, which suggested CC-AAbs in patients with DCM were agonist-like. Our results suggest there are novel agonist-like CC-AAbs in patients with DCM. Calcium-channel AAbs might play an important role in the pathogenesis of DCM.
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Acknowledgments
This work was supported by the National Basic Research Program of China (973 Program: 2007CB512000; 2007CB512005) to Y.-H.L. We thank Michael C. Sanguinetti for the CaV1.2, CaVβ2b, and CaVα2δ1 cDNA.
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Xiao, H., Wang, M., Du, Y. et al. Agonist-like autoantibodies against calcium channel in patients with dilated cardiomyopathy. Heart Vessels 27, 486–492 (2012). https://doi.org/10.1007/s00380-011-0176-7
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DOI: https://doi.org/10.1007/s00380-011-0176-7