Abstract:
:The presence of autoantibodies (aAbs) to thyroglobulin (TG) and thyroperoxidase (TPO) in most of the patients with autoimmune thyroid disease is now well documented. Studies of these aAbs suggested that some, termed TGPO aAbs, could interact with both TG and TPO. This hypothesis was investigated using IgG fraction from a pool of 25 patients' sera with high TG and TPO aAb titres. Immunopurification of TG, TPO and TGPO aAbs was carried out by sequential affinity chromatography using a large quantity of highly purified human TG and TPO. TGPO aAbs, obtained absorption-elution of affinity purified TG aAbs onto a TPO column, were found to represent about 20% of the TG reactive aAbs and 0.23% of the total amount of IgG. Purified TGPO aAbs were characterized and compared to specific TG and TPO aAbs. In contrast to TG and TPO aAbs which recognized only their target antigen, TGPO aAbs showed high affinity interactions with both TG and TPO. As compared to TG aAbs, TGPO aAbs displayed similar affinity for native TG and higher affinity for denatured TG. Compared to TPO aAbs, TGPO aAbs showed lower affinity for both native and denatured TPO. TGPO aAbs also differed from specific TG and TPO aAbs with regard to IgG subclass distribution and antigen fine specificities as determined by monoclonal antibody assisted mapping of TG and TPO surface epitopes. Taken together, these data indicate that TGPO aAbs are effectively present in the serum of patients with autoimmune thyroid disease. TGPO aAbs may be considered as a subpopulation of TG aAbs with the unique property to cross-react with TPO. The existence of aAbs cross-reacting with these functionally and antigenically related thyroid molecules could lead to a re-examination of the emergence of thyroid autoimmunity.
journal_name
Autoimmunityjournal_title
Autoimmunityauthors
Ruf J,Ferrand M,Durand-Gorde JM,Carayon Pdoi
10.3109/08916939209035153subject
Has Abstractpub_date
1992-01-01 00:00:00pages
179-88issue
3eissn
0891-6934issn
1607-842Xjournal_volume
11pub_type
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