Vibration treatment modulates macrophage polarisation and enhances early inflammatory response in oestrogen-deficient osteoporotic-fracture healing
| Autor: | Y-N Chim, Nelson L.S. Tang, Ning Zhang, J. B. Wang, K-S Leung, S K-H Chow, R M-Y Wong, W-H Cheung |
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| Rok vydání: | 2019 |
| Předmět: |
macrophage polarisation
medicine.medical_specialty lcsh:Diseases of the musculoskeletal system Necrosis Cellular differentiation lcsh:Surgery Stimulation Bone healing vibration treatment Systemic inflammation Vibration osteoporotic-fracture healing Rats Sprague-Dawley Immune system Immunity Internal medicine medicine Animals innate immunity Fracture Healing Innate immune system business.industry Macrophages Cell Differentiation Estrogens lcsh:RD1-811 Immunity Innate Interleukin-10 Rats Endocrinology Female lcsh:RC925-935 medicine.symptom business Osteoporotic Fractures |
| Zdroj: | European Cells & Materials, Vol 38, Pp 228-245 (2019) |
| ISSN: | 1473-2262 |
| Popis: | Fracture healing is a well-orchestrated and coordinated process and begins with the inflammatory stage involving the infiltration of immune cells and the release of cytokines, including tumour necrosis factor-alpha (TNF-α), interleukin-6 (IL-6) and interleukin-10 (IL-10). Low-magnitude high-frequency vibration (LMHFV) stimulation is effective in promoting fracture healing. The study hypothesis was that the innate immune response was impaired in osteoporotic fracture and LMHFV could positively modulate it. 9-month-old ovariectomy (OVX)-induced osteoporotic rats were randomised into sham (SHAM), OVX control (OVX), OVX-vibration (OVX-VT) or OVX vibration plus administration of COX-2 specific non-steroid anti-inflammatory drugs (OVX-VT-NSAID). LMHFV (35 Hz, 0.3 g) was given 20 min/d and 5 d/week to the treatment groups. Healing and innate immune response were evaluated by weekly radiographs, endpoint micro-computed tomography (µCT), enzyme-linked immunosorbent assay (ELISA) and histomorphometry at weeks 1, 2, 4 and 8 post-treatment. Results showed that OVX slightly elevated systemic inflammation but impaired the innate immune response locally at the fracture site, with significantly lower expressions of TNF-α and IL-6 but higher IL-10 expression during the early stage of healing. LMHFV was effective in accelerating the delayed fracture healing in OVX bones by partly restoring the impaired innate immune response at the fracture site, accompanied by promoted progression of macrophage polarisation from M1 (pro-inflammatory) to M2 (anti-inflammatory) phenotype. In conclusion, vibration treatment could positively modulate the impaired innate immune response and promote macrophage polarisation in osteoporotic-fracture healing. |
| Databáze: | OpenAIRE |
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