alexa Epitopes, avidity and IgG subclasses of tyrosine hydroxylase autoantibodies in vitiligo and alopecia areata patients.


Journal of Pigmentary Disorders

Author(s): Rahoma SF, Sandhu HK, McDonagh AJ, Gawkrodger DJ, Weetman AP, , Rahoma SF, Sandhu HK, McDonagh AJ, Gawkrodger DJ, Weetman AP,

Abstract Share this page

Abstract BACKGROUND: We previously detected antibodies against tyrosine hydroxylase (TH) in 23\% of patients with nonsegmental vitiligo and in 19\% of patients with alopecia areata (AA). OBJECTIVES: To identify TH epitopes recognized by TH antibodies in patients with vitiligo and AA. METHODS: Recombinant plasmids containing defined fragments of TH cDNA were constructed. The cloned TH cDNA fragments were subsequently translated in vitro to produce a series of [(35) S]-labelled TH protein fragments which were then used in radioimmunoassays to analyse the immunoreactivity of sera from 18 TH antibody-positive patients with vitiligo and so initially define TH epitope domains. Further localization of TH epitopes was investigated by antibody absorption experiments using synthetic TH peptides and nonradiolabelled, in vitro-expressed TH protein fragments. Antibody binding to identified epitopes was confirmed in TH peptide enzyme-linked immunosorbent assays. RESULTS: Analysis of the results obtained indicated the presence of two major antibody-binding sites on TH between amino acids 1 and 14 (epitope 1-14) and between amino acids 61 and 80 (epitope 61-80). Of 18 patients with vitiligo and six with AA, 17 (94\%) and five (83\%), respectively, had antibodies against epitope 1-14. In addition, 11/18 (61\%) vitiligo and 2/6 (33\%) AA patient sera displayed immunoreactivity against epitope 61-80. CONCLUSIONS: Two major binding sites for human TH antibodies are located at the N-terminus of the protein. The humoral immune response to TH in vitiligo and AA is heterogeneous in nature in that patients may have antibodies to more than one TH epitope. TH antibodies from patients with vitiligo or AA can recognize identical epitopes. © 2012 The Authors. BJD © 2012 British Association of Dermatologists. This article was published in Br J Dermatol and referenced in Journal of Pigmentary Disorders

Relevant Expert PPTs

Relevant Speaker PPTs

Recommended Conferences

Relevant Topics

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version