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Published on: April 17, 2013
Anticorpos que bloquean el crecimiento de la tiroides en el mixoedema primario
Nature
|February 12, 1981
Resumen
Las inmunoglobulinas de pacientes con mixoedema primario bloquean los efectos de la hormona estimulante de la tiroides (TSH), a diferencia de las de la enfermedad de Graves. Este hallazgo explica la incapacidad de la glándula tiroides para responder a la TSH en el mixoedema.
Área de la Ciencia:
- Endocrinología Endocrinología.
- Inmunología Inmunología.
- Patología Patología Patología.
Sus antecedentes:
- El mixoedema primario en adultos implica tiroiditis autoinmune, lo que lleva a la destrucción de la glándula tiroides y la insuficiencia hormonal.
- La patogénesis involucra anticuerpos contra la tiroglobulina (TgHA) y anticuerpos microsómicos (McHA), junto con la inmunidad mediada por células.
- Los altos niveles de hormona estimulante de la tiroides (TSH) no pueden estimular el crecimiento de la tiroides en el mixoedema, lo que sugiere factores de bloqueo.
Objetivo del estudio:
- Investigar el papel de los anticuerpos bloqueantes en la patogénesis del mixoedema primario en adultos.
- Para determinar si las inmunoglobulinas de pacientes con mixoedema inhiben el efecto trófico de la TSH en la glándula tiroides.
Principales métodos:
- Utilizó un sistema in vitro para analizar el efecto trófico de la TSH.
- Se midió la síntesis de ADN a través de la citofotometría de Feulgen como indicador del efecto trófico de la TSH.
- Se evaluaron las inmunoglobulinas de pacientes con mixoedema primario y enfermedad de Graves tirotóxica.
Principales resultados:
- Se encontró que las inmunoglobulinas de pacientes con mixoedema primario en adultos bloquean el efecto trófico de la TSH in vitro.
- Este efecto de bloqueo contrasta con la estimulación del crecimiento observada con las inmunoglobulinas de pacientes con enfermedad de Graves.
Conclusiones:
- El estudio identifica anticuerpos bloqueadores en el mixoedema primario que interfieren con la acción de la TSH.
- Estos anticuerpos bloqueadores contribuyen a la falta de respuesta de la glándula tiroides a la TSH, lo que explica la progresión de la enfermedad.
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