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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
Identification of alpha-fetoprotein as an autoantigen in juvenile Batten disease.
Neurobiology of Disease 2008 January
Humoral autoimmunity against glutamic acid decarboxylase has been described in juvenile Batten disease patients and in the Cln3(-/-) mouse model. To obtain a more comprehensive understanding of the repertoire of antigens targeted, we examined the reactivity of Cln3(-/-) mouse sera to brain proteins from fetal, postnatal and adult rats. Among the candidate antigens identified was alpha-fetoprotein (AFP), a protein that has altered expression in several nervous system disorders and hepatic malignancies. Moreover, AFP levels were upregulated in the brains and livers of postnatal day 14 Cln3(-/-) animals. Sera from 31 juvenile Batten disease patients revealed the presence of anti-AFP autoantibodies in juvenile Batten disease male patients (12/13) and female patients (8/18). While these findings provide more evidence that autoimmunity is an active component of juvenile Batten disease, the gender-apparent difference evidenced by patients with regard anti-AFP antibodies may underlie variation in progression and clinical manifestations in this disorder.
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