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Molecular and Cellular Biochemistry

, Volume 399, Issue 1–2, pp 143–153 | Cite as

LAP1 is a crucial protein for the maintenance of the nuclear envelope structure and cell cycle progression

  • Mariana Santos
  • Patrícia Costa
  • Filipa Martins
  • Edgar F. da Cruz e Silva
  • Odete A. B. da Cruz e Silva
  • Sandra Rebelo
Article

Abstract

Cell division in eukaryotes requires the disassembly of the nuclear envelope (NE) at the beginning of mitosis and its reassembly at the end of mitosis. These processes are complex and involve coordinated steps where NE proteins have a crucial role. Lamina-associated polypeptide 1 (LAP1) is an inner nuclear membrane protein that has been associated with cell cycle events. In support of this role, LAP1 has been implicated in the regulation of the NE reassembly and assembly of the mitotic spindle during mitosis. In this study, we demonstrated that LAP1 intracellular levels vary during the cell cycle in SH-SY5Y cells, and that LAP1 is highly phosphorylated during mitosis. It is also clear that LAP1 co-localized with acetylated α-tubulin in the mitotic spindle and with γ-tubulin in centrosomes (main microtubule organizing center) in mitotic cells. Moreover, LAP1 knockdown resulted in decreased number of mitotic cells and decreased levels of acetylated α-tubulin (marker of microtubules stability) and lamin B1. Additionally, it was possible to determine that LAP1 is important for centrosome positioning near the NE. These findings place LAP1 at a key position to participate in the maintenance of the NE structure and progression of the cell cycle.

Keywords

Lamina-associated polypeptide 1 Nuclear envelope Cell cycle Protein phosphorylation Centrosome 

Notes

Acknowledgments

The authors thank Dr. William Dauer (Columbia University, USA) for providing the LAP1 antibody. The work was financed by the Fundação para a Ciência e Tecnologia of the Portuguese Ministry of Sciences and Tecnhology PTDC/BEX-BCM/0493/2012 (and supported by PTDC/QUI-BIQ/101317/2008, and REEQ/1023/BIO/2005—the Centro de Biologia Celular, Universidade de Aveiro). MS and FM were recipients of FCT fellowships (SFRH/BD/65353/2009 and SFRH/BD/81073/2011, respectively).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Mariana Santos
    • 1
  • Patrícia Costa
    • 1
  • Filipa Martins
    • 1
  • Edgar F. da Cruz e Silva
    • 1
  • Odete A. B. da Cruz e Silva
    • 1
  • Sandra Rebelo
    • 1
  1. 1.Neuroscience Laboratory, Health Sciences Department, Centre for Cell BiologyUniversity of AveiroAveiroPortugal

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