Histochemistry and Cell Biology

, Volume 134, Issue 4, pp 387–402 | Cite as

DNA binding sites target nuclear NFATc1 to heterochromatin regions in adult skeletal muscle fibers

  • Tiansheng Shen
  • Yewei Liu
  • Minerva Contreras
  • Erick O. Hernández-Ochoa
  • William R. Randall
  • Martin F. Schneider
Original Paper

Abstract

We have previously demonstrated that Ca2+/calcineurin-dependent dephosphorylation of the transcription factor nuclear factor of activated T cells subtype 1 (NFATc1) during repetitive skeletal muscle activity causes NFAT nuclear translocation and concentration in subnuclear NFAT foci. We now show that NFAT nuclear foci colocalize with heterochromatin regions of intense staining by DAPI or TO-PRO-3 that are present in the nucleus prior to NFATc1 nuclear entry. Nuclear NFATc1 also colocalizes with the heterochromatin markers trimethyl-histone H3 (Lys9) and heterochromatin protein 1α. Mutation of the NFATc1 DNA binding sites prevents entry and localization of NFATc1 in heterochromatin regions. However, fluorescence in situ hybridization shows that the NFAT-regulated genes for slow and fast myosin heavy chains are not localized within the heterochromatin regions. Fluorescence recovery after photobleaching shows that within a given nucleus, NFATc1 redistributes relatively rapidly (t 1/2 < 1 min) between NFAT foci. Nuclear export of an NFATc1 mutant not concentrated in NFAT foci is accelerated following nuclear entry during fiber activity, indicating buffering of free nuclear NFATc1 by NFATc1 within the NFAT foci. Taken together, our results suggest that NFAT foci serve as nuclear storage sites for NFATc1, allowing it to rapidly mobilize to other nuclear regions as required.

Keywords

NFAT Nuclear foci Heterochromatin Skeletal muscle 

Notes

Acknowledgments

We thank Dr. Gerald R. Crabtree (Howard Hughes Medical Institute, Stanford, CA) for providing NFATc1 cDNAs, Drs. M. DiFranco and J.L. Vergara (University of California, Los Angeles) for advice on the intramuscular plasmid injection, and Drs. Tom Misteli and Karen J. Meaburn (National Cancer Institute, National Institutes of Health, Bethesda, MD) for advice on the method of fluorescence in situ hybridization. This work was supported by NIH grant R01-AR056477 from the National Institute of Arthritis and Musculoskeletal and Skin Diseases.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Tiansheng Shen
    • 1
  • Yewei Liu
    • 1
  • Minerva Contreras
    • 1
  • Erick O. Hernández-Ochoa
    • 1
  • William R. Randall
    • 2
  • Martin F. Schneider
    • 1
  1. 1.Department of Biochemistry and Molecular BiologyUniversity of Maryland School of MedicineBaltimoreUSA
  2. 2.Department of Pharmacology and Experimental TherapeuticsUniversity of Maryland School of MedicineBaltimoreUSA

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