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Updated: Aug 14, 2026
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Biological Compatibility Profile on Biomaterials for Bone Regeneration
Published on: November 16, 2018
Immunocompetent properties of human osteoblasts: interactions with T lymphocytes
Katherine T Stanley1, Christa VanDort, Christopher Motyl
1Division of Rheumatology and Rheumatic Disease Core Center, University of Michigan, Ann Arbor, Michigan, USA.
Summary
Osteoblasts (OBs) can act as accessory cells, activating T cells and responding to T cell signals. This bidirectional interaction, involving immune molecules, suggests a role in joint inflammation and bone repair.
Area of Science:
- Immunology
- Cell Biology
- Osteoimmunology
Background:
- Osteoblasts (OBs) interact with lymphocytes during inflammatory joint destruction and fracture repair.
- Understanding OB-T cell interactions is crucial for comprehending immune responses in bone tissue.
Purpose of the Study:
- To determine if osteoblasts serve as accessory cells for T-cell activation.
- To investigate if T cells directly stimulate osteoblast production of IL-6.
- To analyze the bidirectional activating interactions between human T cells and osteoblasts.
Main Methods:
- Utilized in vitro assays to assess T cell and OB interactions in immune responses.
- Employed flow cytometry to analyze the expression of co-stimulatory ligands on osteoblast cell lines.
- Co-cultured T cells with osteoblast lines, including primary human OBs (NHOst) and cell lines (hFOB1.19, SaOS-2).
Main Results:
- Osteoblast lines expressed ligands for T-cell co-stimulation, including CD54/ICAM-1, MHC Class II, and CD166/ALCAM.
- Osteoblasts presented superantigen to T cells, with presentation inhibited by antibodies to LFA-1, MHC Class II, and CD54/ICAM-1.
- T cells stimulated osteoblasts to produce IL-6, an effect enhanced by IL-17.
Conclusions:
- Demonstrated robust, bidirectional activating interactions between human T cells and multiple human osteoblast types.
- The expression of T cell-specific molecule ligands by OBs suggests physiological relevance in vivo.
- These findings highlight the role of osteoblasts in immune responses within bone microenvironments.
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