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The Journal of Immunology, Vol 147, Issue 9 3031-3039, Copyright © 1991 by American Association of Immunologists
ARTICLES |
LA Rokeach, JA Haselby, JF Meilof, RJ Smeenk, TR Unnasch, BM Greene and SO Hoch
Agouron Institute, La Jolla, CA 92037.
Anti-Ro/SS-A antibodies are commonly found in the sera of patients with Sjogren's syndrome and SLE. These antibodies also occur in the mothers of children with neonatal lupus and congenital heart block. Ro/SS-A is a ribonucleoprotein complex whose cellular function remains unknown. To study its cellular function and to characterize its immunoreactivity, we have used an oligonucleotide designed after the published amino terminal sequence of a putative 60-kDa Ro/SS-A autoantigen to isolate its cDNA. This cDNA encodes a polypeptide that is the human homologue of calreticulin, a calcium binding protein of the endoplasmatic reticulum. The encoded polypeptide also shows a 64.4% identity with RAL- 1, an Ag of the river blindness pathogen Onchocerca volvulus. Contrary to the data published by other authors, our results indicate that calreticulin is not a Ro/SS-A autoantigen. Moreover, we show that anticalreticulin autoantibodies occur in the sera of patients with SLE and patients with onchocerciasis.
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