Proteomic analysis of human brain identifies alpha-enolase as a novel autoantigen in Hashimoto's encephalopathy.
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Ochi H, Horiuchi I, Araki N, Toda T, Araki T, Sato K, Murai H, Osoegawa M, Yamada T, Okamura K, Ogino T, Mizumoto K, Yamashita H, Saya H, Kira J
Proteomic analysis of human brain identifies alpha-enolase as a novel autoantigen in Hashimoto's encephalopathy.
FEBS Lett. 2002 Sep 25;528(1-3):197-202.
- PubMed ID
- 12297304 [ View in PubMed]
- Abstract
Hashimoto's encephalopathy (HE) is a rare autoimmune disease associated with Hashimoto's thyroiditis (HT). To identify the HE-related autoantigens, we developed a human brain proteome map using two-dimensional electrophoresis and applied it to the immuno-screening of brain proteins that react with autoantibodies in HE patients. After sequential MALDI-TOF-MASS analysis, immuno-positive spots of 48 kDa (pI 7.3-7.8) detected from HE patient sera were identified as a novel autoimmuno-antigen, alpha-enolase, harboring several modifications. Specific high reactivities against human alpha-enolase were significant in HE patients with excellent corticosteroid sensitivity, whereas the patients with fair or poor sensitivity to the corticosteroid treatment showed less reactivities than cut-off level. Although a few HT patients showed faint reactions to alpha-enolase, 95% of HT patients, patients with other neurological disorders, and healthy subjects tested were all negative. These results suggest that the detection of anti-alpha-enolase antibody is useful for defining HE-related pathology, and this proteomic strategy is a powerful method for identifying autoantigens of various central nervous system diseases with unknown autoimmune etiologies.