Different types of cell-to-cell connections mediated by nanotubular structures
Veranič, Peter ...
Communication between cells is crucial for proper functioning of multi-cellular organisms. The recently discovered membranous tubes, named tunnelling nanotubes (TNTs), that directly bridge ...neighbouring cells, may offer a very specific and effective way of intercellular communication. Our experiments on RT4 and T24 urothelial cell lines show that nanotubes that bridge neighbouring cells can be divided into two types. The nanotubes of typeI are shorter, more dynamic and contain actin filaments. They are formed when cells explore their surroundings in order to make contact with another cell. The nanotubes of type II are longer, more stable and have cytokeratin filaments. They are formed when two already connected cells start to move apart. On the nanotubes of both types small vesicles were found as an integralpart of the nanotubes (i.e. dilatations of the nanotubes). The dilatations of type II nanotubes do not move along the nanotubes, while the nanotubes of type I have frequently dilatations (gondolas) that move along thenanotubes in both directions. A possible model of formation and mechanical stability of nanotubes that bridge two neighbouring cells is discussed.
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