Characterization of thyroglobulin epitopes in Sardinian adults and juveniles with Hashimoto's thyroiditis: evidence against a major effect of age and genetic background on B-cell epitopes.
Clin Endocrinol (Oxf)
; 73(1): 110-3, 2010 Jul.
Article
in En
| MEDLINE
| ID: mdl-19912245
ABSTRACT
BACKGROUND:
Using recombinant human monoclonal thyroglobulin antibodies expressed as Fab molecules (TgAb-Fab), we have recently confirmed the restriction of Tg epitopes in Hashimoto's thyroiditis (HT).OBJECTIVE:
To investigate Tg epitopes of serum TgAb in HT adults and HT juveniles from a geographically isolated area (Sardinia). DESIGN AND PATIENTS Serum TgAb of 39 Sardinian HT adults, 53 Sardinian HT juveniles and 45 non-Sardinian HT adults were evaluated. The binding of serum TgAb to Tg in ELISA was inhibited by four recombinant human TgAb-Fab, identifying Tg epitopic regions A-D. The percentage of Tg binding inhibition was calculated comparing the binding of serum TgAb in presence of each TgAb-Fab with that in its absence.RESULTS:
In the whole cohort of 137 patients, A region TgAb-Fab induced the highest levels of inhibition (55.3 +/- 17.8%) (mean +/- SD). Lower levels of inhibition were induced by TgAb-Fab of regions B (27.8 +/- 25.8%), C (26.8 +/- 24.6%) and D (17.5 +/- 18.4%). In Sardinian HT adults inhibition by TgAb-Fab of regions A, B and C were comparable to Sardinian HT juveniles; the marginal D region TgAb-Fab induced a slightly higher inhibition (22.1 vs. 13.8%; P = 0.034) in the former than in the latter group. In Sardinian and non-Sardinian HT adults inhibitions by the four TgAb-Fab were similar.CONCLUSIONS:
In HT, the Tg epitope pattern of serum TgAb was similar in juveniles and adults from a geographically restricted area and in two adult populations from different geographical areas. Thus, in HT, neither age nor genetic background appear to influence B-cell epitopes.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Thyroglobulin
/
Epitopes, B-Lymphocyte
/
Hashimoto Disease
Limits:
Adolescent
/
Adult
/
Child
/
Female
/
Humans
/
Male
Country/Region as subject:
Europa
Language:
En
Journal:
Clin Endocrinol (Oxf)
Year:
2010
Type:
Article
Affiliation country:
Italy