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Abstract:
Dendritic cells (DCs) sample peripheral tissues of the bodyin search of antigens to present to T cells. This requires twoprocesses, antigen processing and cell motility, originallythought to occur independently. We found that the major histocompatibilitycomplex II–associated invariant chain (Ii or CD74), aknown regulator of antigen processing, negatively regulatesDC motility in vivo. By using microfabricated channels to mimicthe confined environment of peripheral tissues, we found thatwild-type DCs alternate between high and low motility, whereasIi-deficient cells moved in a faster and more uniform manner.The regulation of cell motility by Ii depended on the actin-basedmotor protein myosin II. Coupling antigen processing and cellmotility may enable DCs to more efficiently detect and processantigens within a defined space.
1 INSERM U653, Institut Curie, 12 rue Lhomond, 75005, Paris, France. 2 Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Santiago, Chile. 3 CNRS UMR144, Institut Curie, 12 rue Lhomond, 75005, Paris, France. 4 Fundación Ciencia para la Vida and Instituto Milenio de Biología Fundamental y Aplicada, Avenida Zañartu 1482, Santiago, Chile. 5 Facultad de Ciencias de la Salud, Universidad Andrés Bello, Avenida Zañartu 1482, Santiago, Chile.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: amlennon{at}curie.fr (A.-M.L.-D.) and mpiel{at}curie.fr (M.P.)
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