Interaction of intermediate filaments with nuclear lamina and cell periphery

Electron Microscopy Reviews
S W FrenchS H Swierenga

Abstract

Ultrastructural observations of the cytoskeleton suggest that the connection of the intermediate filaments (IFs) to actin microfilaments (MFs) at the plasma membrane and the nuclear lamina inside the nuclear membrane link signals received at the cell periphery to the nucleus. When these connections are viewed in three dimensions using detergent extracted cytoskeletal preparations from tissue cultures or slices made from tissue, the IFs are seen to run without interruption from the cell periphery to the nucleus and back. The IFs form side to side connections with the nuclear lamina and pore complexes. The nucleus and the centrioles are supported and held suspended in these extracted cells where all organelles and cytosol have been removed. The IFs are particularly dense in the ectoplasm where they form a sheet and provide the scaffolding which maintains the shape of the extracted cells. The IFs in the ectoplasm are attached to desmoplakin at cell-cell desmosome adhesions and to MFs where the cells are attached to the fibronectin substratum possibly through integrin linkages at adhesion plaques. This was graphically shown by immunogold labelling of IF cells treated with nickel. In this way, it was possible to visualize the loss o...Continue Reading

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