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Auto-anticorpos anti-receptores de TSH (TSHRAbs) foram avaliados por dois diferentes métodos [TRAb, como % de inibição de ligação do TSH por anticorpos séricos e produção de AMP cíclico em cultura de células CHO expressando o receptor de TSH humano recombinante (CHO-rhTSHR)] em 52 pacientes (36F/16M) com moléstia de Graves-Basedow (DGB), tanto antes do tratamento como aos 6 e 12 meses de terapia contínua com metimazol (40-60mg/dia) e L-tiroxina (100mig/dia); outros 20 pacientes tireotóxicos (12F/8M) foram tratados com doses individualizadas de radioiodo. Os TSHRAbs determinados pelo radioreceptorensaio foram positivos em 47/52 pacientes (90,4%) com valor médio±EPM de 56,7±3,9%, diminuindo significantemente aos 6 (40,5±3,2%) e 12 meses (43,5±4,7%) de terapêutica, bem como após radioiodo (30,7±4,5%). Os TSHRAbs foram discriminados pelo bioensaio em todos os 52 pacientes com DGB ativa (1122±409%). Após 6 e 12 meses de terapêutica houve decréscimo (não significante) dos valores iniciais. Nenhum indivíduo do grupo controle normal (n= 80) apresentou TSHRAbs detectado por qualquer dos métodos. Portanto, a sensibilidade da pesquisa dos anticorpos pelo bioensaio, nos 52 pacientes com DGB ativa, foi maior que nos mesmos indivíduos avaliados pelo radioreceptorensaio. Houve correlação positiva (r= 0,59; p<0,001) entre TRAb e CHO-rhTSHR. Concluímos que a pesquisa dos TSHRAbs, realizada quer pelo radioreceptorensaio como pelo bioensaio, constitui recurso útil para se avaliar a atividade autoimune na DGB. Antibodies directed to the TSH receptor (TSHRAbs), detected by TRAb as TSH-binding inhibitory immunoglobulin, and cyclic AMP production by CHO cells expressing human TSH recombinant receptor (CHO-rhTSHR) were determined in 52 patients (36F/16M) with Graves' disease (DGB), both before and at 6 and 12 months of continuous treatment with metimazol (40-60mg/day) associated with L-thyroxine (100mug/day). Another group of 20 patients (12F/8M) was referred for radioiodine (RAI) treatment. The TSHRAbs were detected by radioreceptor assay in none of the 80 normal control individuals and in 47/52 patients (90.4%) with a mean±SEM value of 56.7±3.9%. There was a significant decrease of mean TRAb values at 6 and 12 months of MMI + LT4 therapy. Six months after RAI, TRAb decreased significantly to 30.7±4.5%. In contrast, TSHRAbs were determined by bioassay in none of the 80 normal control subjects but in all 52 patients with a mean±SEM of 1122±409%. Similarly to TRAb there was a non-significant decrease at 6 and 12 months of MMI + LT4 therapy. Thus, the sensitivity of TSHRAbs detected by bioassay in 52 patients with active DGB seems to be greater than that detected by radioreceptor. In conclusion, the radioreceptor assay values as well as the bioassay for TSHRAbs may be useful for the diagnosis of active DGB

arquivos brasileiros de endocrinologia and metabologia

Comparação entre diferentes métodos para avaliar a presença de auto-anticorpos dirigidos ao receptor de TSH em pacientes com moléstia de Graves-Basedow