Jong-Il Yoon, Head of the Research Division (Regulatory T Cells and Ma…
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Jong-Il Yoon, Head of the Research Division (Regulatory T Cells and Macrophages in Osseointegration: Osteoimmunology and Osteoimmunologic Integration – A Narrative Review)
https://www.mdpi.com/1422-0067/26/11/5421
Abstract (Summary)
Osseointegration refers to the direct contact between dental implants and living bone, confirmed under electron microscopy as a direct connection between titanium and bone. Recent research, however, views this not merely as mechanical attachment but as the outcome of immunological interactions. Osteoimmunology explores the crosstalk between bone and immune cells, with regulatory T cells (Tregs) and macrophages playing central roles in tissue healing and bone formation. This review highlights the function of these two cell populations and discusses immunomodulatory strategies to enhance osseointegration.
Key Points
1. Overview of Osteoimmunology
The immune system distinguishes self from non-self, initiating defense responses. Composed of innate (e.g., macrophages, neutrophils) and adaptive (e.g., T cells, B cells) immunity. All immune cells originate from hematopoietic stem cells (HSCs) in the bone marrow.
2. Role of Regulatory T Cells (Tregs)
Suppress Th17-driven inflammation and bone destruction. Convert ATP into adenosine via CD39–CD73 enzymes; adenosine enhances immune suppression through A2A/A2B receptors. Adenosine–Treg interactions rapidly dampen excessive inflammation and promote tissue repair. Interact with neutrophils, dendritic cells, MSCs, and macrophages to regulate inflammation and healing.
3. Macrophage Polarization (M1/M2)
M1 phenotype: pro-inflammatory, tissue-destructive, bone-resorptive. M2 phenotype: anti-inflammatory, pro-regenerative, angiogenic, osteogenic. Adenosine and Tregs regulate the M1→M2 transition. For implant osseointegration, M1→M2 switching is crucial; persistent M1 dominance leads to peri-implantitis. Failure of this transition increases risks of fibrous encapsulation and implant failure.
4. Role of PDRN
Salmon-derived DNA fragments stimulate adenosine receptors, suppressing excessive inflammation and promoting M2 polarization. Enhance VEGF and IL-10 secretion, aiding regeneration and bone formation. Shown to inhibit RANKL-induced bone resorption. Considered a highly promising agent for early osseointegration and implant maintenance.
5. Conclusion
Osseointegration should be redefined as “Osteoimmunologic Integration”—a complex interplay between immune and bone cells. Immunomodulation via Tregs and macrophages is key to shifting the peri-implant environment toward anti-inflammatory, regenerative conditions. This paradigm provides a foundation for developing immunoregulatory biomaterials and improving implant success rates.
https://www.mdpi.com/1422-0067/26/11/5421
Abstract (Summary)
Osseointegration refers to the direct contact between dental implants and living bone, confirmed under electron microscopy as a direct connection between titanium and bone. Recent research, however, views this not merely as mechanical attachment but as the outcome of immunological interactions. Osteoimmunology explores the crosstalk between bone and immune cells, with regulatory T cells (Tregs) and macrophages playing central roles in tissue healing and bone formation. This review highlights the function of these two cell populations and discusses immunomodulatory strategies to enhance osseointegration.
Key Points
1. Overview of Osteoimmunology
The immune system distinguishes self from non-self, initiating defense responses. Composed of innate (e.g., macrophages, neutrophils) and adaptive (e.g., T cells, B cells) immunity. All immune cells originate from hematopoietic stem cells (HSCs) in the bone marrow.
2. Role of Regulatory T Cells (Tregs)
Suppress Th17-driven inflammation and bone destruction. Convert ATP into adenosine via CD39–CD73 enzymes; adenosine enhances immune suppression through A2A/A2B receptors. Adenosine–Treg interactions rapidly dampen excessive inflammation and promote tissue repair. Interact with neutrophils, dendritic cells, MSCs, and macrophages to regulate inflammation and healing.
3. Macrophage Polarization (M1/M2)
M1 phenotype: pro-inflammatory, tissue-destructive, bone-resorptive. M2 phenotype: anti-inflammatory, pro-regenerative, angiogenic, osteogenic. Adenosine and Tregs regulate the M1→M2 transition. For implant osseointegration, M1→M2 switching is crucial; persistent M1 dominance leads to peri-implantitis. Failure of this transition increases risks of fibrous encapsulation and implant failure.
4. Role of PDRN
Salmon-derived DNA fragments stimulate adenosine receptors, suppressing excessive inflammation and promoting M2 polarization. Enhance VEGF and IL-10 secretion, aiding regeneration and bone formation. Shown to inhibit RANKL-induced bone resorption. Considered a highly promising agent for early osseointegration and implant maintenance.
5. Conclusion
Osseointegration should be redefined as “Osteoimmunologic Integration”—a complex interplay between immune and bone cells. Immunomodulation via Tregs and macrophages is key to shifting the peri-implant environment toward anti-inflammatory, regenerative conditions. This paradigm provides a foundation for developing immunoregulatory biomaterials and improving implant success rates.
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