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Cell Commun Adhes. 2001;8(4-6):231-6.

Role of cytoskeletal elements in the recruitment of Cx43-GFP and Cx26-YFP into gap junctions.

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  • 1Department of Anatomy and Cell Biology, University of Western Ontario, London, Canada.


Cytoskeletal elements may be important in connexin transport to the cell surface, cell surface gap junction plaque formation and/or gap junction internalization. In this study, fluorescence recovery after photobleaching was used to examine the role of microfilaments and microtubules in the recruitment and coalescence of green fluorescent protein-tagged Cx43 (Cx43-GFP) or yellow fluorescent tagged-Cx26 (Cx26-YFP) into gap junctions in NRK cells. In untreated cells, both Cx26-YFP and Cx43-GFP were recruited into gap junctions within photobleached areas of cell-cell contact within 2 hrs. However, disruption of microfilaments with cytochalasin B inhibited the recruitment and assembly of both Cx26-YFP and Cx43-GFP into gap junctions within photobleached areas. Surprisingly, disruption of microtubules with nocodazole inhibited the recruitment of Cx43-GFP into gap junctions but had limited effect on the transport and clustering of Cx26-YFP into gap junctions within the photobleached regions of cell-cell contact. These results suggest that the recruitment of Cx43-GFP and Cx26-YFP to the cell surface or their lateral clustering into gap junctions plaques is dependent in part on the presence of intact actin microfilaments while Cx43-GFP was more dependent on intact microtubules than Cx26-YFP.

[PubMed - indexed for MEDLINE]
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