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Cell-to-cell communication is a crucial prerequisite for thedevelopment and maintenance of multicellular organisms. To date,diverse mechanisms of intercellular exchange of informationhave been documented, including chemical synapses, gap junctions,and plasmodesmata. Here, we describe highly sensitive nanotubularstructures formed de novo between cells that create complexnetworks. These structures facilitate the selective transferof membrane vesicles and organelles but seem to impede the flowof small molecules. Accordingly, we propose a novel biologicalprinciple of cell-to-cell interaction based on membrane continuityand intercellular transfer of organelles.
1 Interdisciplinary Center of Neuroscience (IZN), Institute of Neurobiology, University of Heidelberg, INF 364, Heidelberg 69120, Germany. 2 Otto-Meyerhoff-Zentrum, University of Heidelberg, INF 350, Heidelberg 69120, Germany. 3 Institute of Biochemistry, Faculty of Medicine, University of Belgrade, Pasterova 2, Belgrade 11000, Yugoslavia. 4 Electron Microscopy Facility, University of Ulm, Albert-Einstein-Allee 11, 89069 Ulm, Germany. 5 Institute for Biochemistry and Molecular Biology, University of Bergen, Jonas Lies vei 91, Bergen 5009, Norway.
* To whom correspondence should be addressed. E-mail: Hans-Hermann.Gerdes{at}ibmb.uib.no
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