REVISTA DE INMUNOALERGIA
6. Regulación de la actividad del
complemento
La dermatomiositis es una miopatía inflamatoria caracterizada por una vasculitis del endomisio mediada por el complemento. Pacientes con dermatomiositis que no responden a la terapia convencional, muestran mejoría con la aplicación de IgGIV a grandes dosis.
Las
biopsias de músculo de pacientes tratados con IgGIV indican la desaparición de
los depósitos de C3b y de los complejos de ataque a la membrana (C5b6-9), en
los capilares del endomisio, con restablecimiento de la red capilar.
Es
probable que la IgGIV interfiera la captación de fragmentos de C3b o C4b,
formando complejos entre estos fragmentos y un sitio aceptor específico
en la molécula de IgG (26).
Un resumen de las acciones moduladoras negativas de las respuestas inmunes en enfermedades inflamatorias crónicas y autoinmunes, así como las dosis de la IgGIV empleadas como tratamiento en ellas se aprecian en la tabla 1.
Existen informes a cerca del
beneficio recibido en más de 35 enfermedades tratadas con IgGIV, algunas de
ellas descritas en la tabla 2 (27).
Tabla 2. Enfermedades con resultados benéficos luego de la terapia con
IgGIV
|
Enfermedades |
|
| 1. Desórdenes inmuno-hematológicos |
|
| 2. Enfermedades autoinmunes autoinmune |
|
| 3. Enfermedades con etiología inmunopatológica |
|
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