Immunopurification and characterization of thyroid autoantibodies with dual specificity for thyroglobulin and thyroperoxidase.

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

Autoimmunity

journal_title

Autoimmunity

authors

Ruf J,Ferrand M,Durand-Gorde JM,Carayon P

doi

10.3109/08916939209035153

subject

Has Abstract

pub_date

1992-01-01 00:00:00

pages

179-88

issue

3

eissn

0891-6934

issn

1607-842X

journal_volume

11

pub_type

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