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La clasificación hidrodinámica de proteínas mediada por flujo en la superficie celular de los tripanosomas
Markus Engstler1, Thomas Pfohl, Stephan Herminghaus
1Institut für Mikrobiologie und Genetik, Technische Universität Darmstadt, Schnittspahnstrasse 10, 64287, Darmstadt, Germany. engstler@bio.tu-darmstadt.de
Cell
|November 6, 2007
Resumen
El Trypanosoma brucei elimina la inmunoglobulina (Ig) del huésped moviendo los complejos Ig-VSG a la célula.
Área de la Ciencia:
- Parasitología Parasitología.
- Biología celular Biología celular.
- Inmunología Inmunología.
Sus antecedentes:
- El parásito unicelular Trypanosoma brucei elude la inmunidad del huésped derramando rápidamente las proteínas superficiales.
- Las glicoproteínas de superficie variantes (VSG) recubren la superficie del parásito, anclando el glicosilfosfatidilinositol (GPI).
- La inmunoglobulina (Ig) derivada del huésped que se une a VSG presenta un desafío para la supervivencia del parásito.
Objetivo del estudio:
- Para dilucidar el mecanismo por el cual Trypanosoma brucei elimina la inmunoglobulina (Ig) del huésped de su superficie.
- Investigar el papel de la motilidad celular y la endocitosis en la eliminación del complejo inmunológico Ig-VSG.
- Comprender las implicaciones de este mecanismo de aclaramiento para la supervivencia de los parásitos y los roles potenciales en otros tipos de células.
Principales métodos:
- Observación del movimiento del complejo inmunológico Ig-VSG en la superficie del parásito.
- Análisis de la dependencia del movimiento del complejo inmune en la motilidad celular, endocitosis y función de actina.
- Investigando el papel de las fuerzas hidrodinámicas en la clasificación de proteínas.
Principales resultados:
- Los complejos inmunes Ig-VSG se clasifican pasivamente en el polo celular posterior de Trypanosoma brucei.
- Este movimiento requiere movilidad celular hacia adelante, pero es independiente de la endocitosis y la actina.
- El flujo hidrodinámico que actúa sobre los tripanosomas nadadores impulsa el movimiento direccional de los complejos Ig-VSG, que funcionan como velas moleculares.
Conclusiones:
- Trypanosoma brucei emplea un mecanismo único de eliminación de anticuerpos, utilizando fuerzas hidrodinámicas para el movimiento direccional de los complejos inmunes Ig-VSG.
- Este mecanismo ayuda a proteger a los tripanosomas de la destrucción mediada por el complemento.
- Los hallazgos sugieren un potencial significado funcional de la clasificación hidrodinámica de proteínas en otros tipos de células, como las células epiteliales.
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