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Related Experiment Videos

TR expression and function in human bone marrow stromal and osteoblast-like cells.

Ayesha Siddiqi1, Marie P Parsons, John L Lewis

  • 1Department of Endocrinology, St. Bartholomew's and the Royal London School of Medicine and Dentistry, West Smithfield, London, United Kingdom EC1A 7BE.

The Journal of Clinical Endocrinology and Metabolism
|February 12, 2002
PubMed
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Thyroid hormone receptors (TRs) are present in human bone cells, but their expression and activity vary. TRalpha1, TRbeta1, and TRbeta2 are found in osteoblasts and bone marrow stromal cells, with higher activity in stromal cells.

Area of Science:

  • Endocrinology
  • Bone Biology
  • Molecular Biology

Background:

  • Thyroid hormones are crucial for bone metabolism, affecting both formation and resorption.
  • Thyroid hormone receptors (TRs) mediate these effects through transcriptional regulation.
  • The specific TR isoforms (TRalpha1, TRbeta1, TRbeta2) and their roles in human osteoblasts are not fully understood.

Purpose of the Study:

  • To investigate the expression and functional activity of TR isoforms in primary human osteoblasts (hOb) and human bone marrow stromal cells (hBMS).
  • To compare TR expression in primary bone cells with human osteosarcoma cell lines (MG63 and SaOs-2).

Main Methods:

  • Immunocytochemistry and Western blotting to detect TR protein expression.
  • Nuclear binding assays using radiolabeled T(3) to assess T(3) binding.

Related Experiment Videos

  • Transient transfection studies with a luciferase reporter gene to measure endogenous TR activity.

    • Main Results:

    • TRalpha1, TRbeta1, and TRbeta2 proteins were detected in all cell types, with highest expression in MG63 > hBMS > SaOs-2 > hOb.
    • TRalpha1 showed the highest expression among the isoforms in all cell types.
    • Functional TR activity, indicated by T(3)-induced luciferase expression, was significant in MG63 and hBMS cells but not detectable in SaOs-2 and hOb cells.

    Conclusions:

    • Three main TR isoforms are expressed in human osteoblast lineage cells.
    • TR expression and functional activity are predominantly found in human bone marrow stromal cells (hBMS) compared to primary human osteoblasts (hOb).
    • Further research is needed to elucidate distinct mechanisms of thyroid hormone action mediated by different TR isoforms in hOb and hBMS cells.