Histochemistry and Cell Biology

, Volume 124, Issue 5, pp 347–358

Nuclear distribution of actin and myosin I depends on transcriptional activity of the cell

  • Katarína Kyselá
  • Anatoly A. Philimonenko
  • Vlada V. Philimonenko
  • Jiří Janáček
  • Michal Kahle
  • Pavel Hozák
Original paper

Abstract

As previous studies suggested, nuclear myosin I (NMI) and actin have important roles in DNA transcription. In this study, we characterized the dynamics of these two proteins during transcriptional activation in phytohemagglutinin (PHA) stimulated human lymphocytes. The stimulation led to strong up-regulation of NMI both on the mRNA and protein level, while actin was relatively stably expressed. The intranuclear distribution of actin and NMI was evaluated using immunogold labeling. In nucleoli of resting cells, actin was localized predominantly to fibrillar centers (FCs), while NMI was located mainly to the dense fibrillar component (DFC). Upon stimulation, FCs remained the main site of actin localization, however, an accumulation of both actin and NMI in the DFC and in the granular component was observed. In the nucleoplasm of resting lymphocytes, both actin and NMI were localized mostly in condensed chromatin. Following stimulation, the majority of both proteins shifted towards the decondensed chromatin. In transcriptionally active cells, both actin and NMI colocalized with nucleoplasmic transcription sites. These results demonstrate that actin and NMI are compartmentalized in the nuclei where they can dynamically translocate depending on transcriptional activity of the cells.

Keywords

Cell nucleus Human lymphocytes Actin Nuclear myosin I Transcription 

Abbreviations

PHA

Phytohemagglutinin

FC

Fibrillar center

DFC

Dense fibrillar component

GC

Granular component

NMI

Nuclear myosin I

RT

Room temperature

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Katarína Kyselá
    • 1
  • Anatoly A. Philimonenko
    • 1
  • Vlada V. Philimonenko
    • 1
  • Jiří Janáček
    • 2
  • Michal Kahle
    • 1
  • Pavel Hozák
    • 1
  1. 1.Department of Cell Ultrastructure and Molecular Biology, Institute of Experimental MedicineAcademy of Sciences of the Czech RepublicPrague 4Czech Republic
  2. 2.Department of Biomathematics, Institute of PhysiologyAcademy of Sciences of the Czech RepublicPrague 4Czech Republic

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