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Related Experiment Videos

NFAT expression in human osteoclasts.

Christopher J Day1, Michael S Kim, Carolina M Lopez

  • 1School of Health Sciences, Griffith University, Gold Coast campus, Parklands Drive, Southport, Queensland 4215, Australia.

Journal of Cellular Biochemistry
|March 11, 2005
PubMed
Summary
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Nuclear factor of activated T-cells cytoplasmic 1 (NFATc1) is the primary NFAT in human osteoclasts, with distinct mRNA variants expressed. Its induction in osteoclasts is independent of calcineurin-mediated autoregulation.

Area of Science:

  • Molecular Biology
  • Immunology
  • Cell Biology

Background:

  • Nuclear factor of activated T-cells cytoplasmic (NFATc) proteins are transcription factors crucial for immune responses.
  • The NFATc family comprises four members (NFATc1-NFATc4) with diverse roles.
  • Understanding NFATc expression in non-immune cells like osteoclasts is important.

Purpose of the Study:

  • To investigate the expression profile of NFATc members in human osteoclasts.
  • To identify the predominant NFATc1 mRNA variants and protein isoforms in osteoclasts.
  • To explore the regulatory mechanism of NFATc1 induction in osteoclasts.

Main Methods:

  • Quantitative analysis of NFATc gene family expression in human osteoclasts and macrophage-like cells.
  • Identification and quantification of NFATc1 mRNA transcript variants and protein isoforms.

Related Experiment Videos

  • Assessment of NFATc1 induction in the presence of calcineurin inhibitor cyclosporin A.

    • Main Results:

    • NFATc1 is the major induced NFAT in human osteoclasts, significantly outnumbering NFATc2-NFATc4.
    • NFATc1 comprises five mRNA variants encoding three protein isoforms, with variants 3 (isoform C) and 5 (isoform B) being most abundant.
    • NFATc1 induction in osteoclasts is not affected by cyclosporin A, indicating a lack of calcineurin-dependent autoregulation.
    • Osteoclast-expressed NFATc1 variants resemble those in naïve T-cells, not effector T-cells.

    Conclusions:

    • NFATc1 plays a dominant role in human osteoclasts compared to other NFATc members.
    • Specific NFATc1 isoforms are preferentially expressed in osteoclasts.
    • NFATc1 activation in osteoclasts may involve pathways independent of calcineurin-mediated autoregulation.
    • The expression pattern of NFATc1 in osteoclasts suggests unique functional roles distinct from effector T-cells.