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There exists abundant molecular and ultra-structural evidence to suggest that cytoplasmic actin …


Biology Articles » Cell biology » Actin polymerisation at the cytoplasmic face of eukaryotic nuclei

Abstract
- Actin polymerisation at the cytoplasmic face of eukaryotic nuclei

Actin polymerisation at the cytoplasmic face of eukaryotic nuclei

Sylvia Münter,2, Jost Enninga3, Rafael Vazquez-Martinez,5, Erwan Delbarre6, Brigitte David-Watine1, Ulf Nehrbass1 and Spencer L Shorte7

1Unité de Biologie Cellulaire du Noyau, CNRS URA 2582, Département de Biologie Cellulaire et Infection, Institut Pasteur; 25, Rue du Docteur Roux, 75724 Paris Cedex 15, France
2Department of Parasitology, Heidelberg University School of Medicine, Im Neuenheimer Feld 326, 69120 Heidelberg, Germany
3Unité de Pathogénie Microbienne Moléculaire, U389 INSERM Institut Pasteur; 28, Rue du Docteur Roux, 75724 Paris Cedex 15, France
4Unité de Embryologie Moléculaire, Institut Pasteur; 25, Rue du Docteur Roux, 75724 Paris Cedex 15, France
5Department of Cell Biology, University of Cordoba, 14014-Cordoba, Spain
6Département de Biologie Cellulaire, Institut Jacques Monod, CNRS, Universités Paris 6 and 7, 75251 Paris Cedex 05, France
7Plate-Forme d'Imagerie Dynamique (PFID), Département de Biologie Cellulaire et Infection, Institut Pasteur; 25, Rue du Docteur Roux, 75724 Paris Cedex 15, France

Background

There exists abundant molecular and ultra-structural evidence to suggest that cytoplasmic actin can physically interact with the nuclear envelope (NE) membrane system. However, this interaction has yet to be characterised in living interphase cells.

Results

Using a fluorescent conjugate of the actin binding drug cytochalasin D (CD-BODIPY) we provide evidence that polymerising actin accumulates in vicinity to the NE. In addition, both transiently expressed fluorescent actin and cytoplasmic micro-injection of fluorescent actin resulted in accumulation of actin at the NE-membrane. Consistent with the idea that the cytoplasmic phase of NE-membranes can support this novel pool of perinuclear actin polymerisation we show that isolated, intact, differentiated primary hepatocyte nuclei support actin polymerisation in vitro. Further this phenomenon was inhibited by treatments hindering steric access to outer-nuclear-membrane proteins (e.g. wheat germ agglutinin, anti-nesprin and anti-nucleoporin antibodies).

Conclusion

We conclude that actin polymerisation occurs around interphase nuclei of living cells at the cytoplasmic phase of NE-membranes.

Source: BMC Cell Biology 2006, 7:23. Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0).


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