Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.


Microdomains of the C-type lectin DC-SIGN are portals for virus entry into dendritic cells

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Alessandra Cambi, Frank de Lange, Noortje M. van Maarseveen, Monique Nijhuis, Ben Joosten, Erik M.H.P. van Dijk, Bärbel I. de Bakker, Jack A.M. Fransen, Petra H.M. Bovee-Geurts, Frank N. van Leeuwen, Niek F. Van Hulst and Carl G. Figdor
The Journal of Cell Biology
Volume 164, Number 1, 145-155, 5 January 2004

The C-type lectin dendritic cell (DC)-specific intercellular adhesion molecule grabbing non-integrin (DC-SIGN; CD209) facilitates binding and internalization of several viruses, including HIV-1, on DCs, but the underlying mechanism for being such an efficient phagocytic pathogen-recognition receptor is poorly understood. By high resolution electron microscopy, we demonstrate a direct relation between DC-SIGN function as viral receptor and its microlocalization on the plasma membrane. During development of human monocyte-derived DCs, DC-SIGN becomes organized in well-defined microdomains, with an average diameter of 200 nm. Biochemical experiments and confocal microscopy indicate that DC-SIGN microdomains reside within lipid rafts. Finally, we show that the organization of DC-SIGN in microdomains on the plasma membrane is important for binding and internalization of virus particles, suggesting that these multimolecular assemblies of DC-SIGN act as a docking site for pathogens like HIV-1 to invade the host.
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