IADR Abstract Archives
CXCL12/CXCR4 Regulate Orthodontic Root Resorption via M1/M2 Ratio
Objectives: Mechanical force-induced external root resorption is a major clinical side effect of orthodontic treatment. Recent study has revealed that M1 macrophages play a vital role in promoting orthodontic root resorption (ORR). In our present study, the mechanism of how mechanical force stimulation increases the M1/M2 macrophage ratio in periodontal tissue is investgated.
Methods: 40g force was utilized in the excessive stress-induced root resorption model. Root resorption was assessed using Micro–Computed Tomography (CT) and TRAP staining. CXCR4 antagonist AMD3100 was administrated to allevated ORR. Flow cytometric, immunofluorescence, western blot and co-culture system of hPDLCs and THP-1 was performed to investigate roles of CXCL12/CXCR4 in ORR.
Results: In the current study, we showed that C-X-C motif chemokine 12 (CXCL12)+ periodontal ligament cells (PDLCs) and C-X-C chemokine receptor type 4 (CXCR4)+ monocytes in the periodontal ligament (PDL) were significantly increased after force application with ongoing root resorption, and these effects were partially rescued after force removal in mice. The expression of CXCL12 in PDLCs was increased by force stimulation in a time- and intensity-dependent manner in vitro. Blockage of the CXCL12/CXCR4 axis using CXCR4 antagonist AMD3100 was sufficient to alleviate ORR and reverse the force-enhanced M1/M2 macrophage ratio. Further mechanism exploration showed that Ly6Chi inflammatory monocytes homed in a CXCL12/CXCR4 axis-dependent manner. The number and proportion of CD11b+ Ly6Chi inflammatory monocytes in cervical lymph nodes were significantly increased by force loading, accompanied by decreased CD11b+ Ly6Chi monocytes in the blood. These changes were blunted by intraperitoneal injection of AMD3100. Additionally, blockage of the CXCL12/CXCR4 axis effectively reversed M2 suppression and promoted M1 polarization.
Conclusions: Collectively, our studies results indicate that force-induced CXCL12/CXCR4 axis mediates ORR by increasing the M1/M2 ratio in periodontal tissues through attracting Ly6Chi inflammatory monocytes and modulating macrophage polarization.
Methods: 40g force was utilized in the excessive stress-induced root resorption model. Root resorption was assessed using Micro–Computed Tomography (CT) and TRAP staining. CXCR4 antagonist AMD3100 was administrated to allevated ORR. Flow cytometric, immunofluorescence, western blot and co-culture system of hPDLCs and THP-1 was performed to investigate roles of CXCL12/CXCR4 in ORR.
Results: In the current study, we showed that C-X-C motif chemokine 12 (CXCL12)+ periodontal ligament cells (PDLCs) and C-X-C chemokine receptor type 4 (CXCR4)+ monocytes in the periodontal ligament (PDL) were significantly increased after force application with ongoing root resorption, and these effects were partially rescued after force removal in mice. The expression of CXCL12 in PDLCs was increased by force stimulation in a time- and intensity-dependent manner in vitro. Blockage of the CXCL12/CXCR4 axis using CXCR4 antagonist AMD3100 was sufficient to alleviate ORR and reverse the force-enhanced M1/M2 macrophage ratio. Further mechanism exploration showed that Ly6Chi inflammatory monocytes homed in a CXCL12/CXCR4 axis-dependent manner. The number and proportion of CD11b+ Ly6Chi inflammatory monocytes in cervical lymph nodes were significantly increased by force loading, accompanied by decreased CD11b+ Ly6Chi monocytes in the blood. These changes were blunted by intraperitoneal injection of AMD3100. Additionally, blockage of the CXCL12/CXCR4 axis effectively reversed M2 suppression and promoted M1 polarization.
Conclusions: Collectively, our studies results indicate that force-induced CXCL12/CXCR4 axis mediates ORR by increasing the M1/M2 ratio in periodontal tissues through attracting Ly6Chi inflammatory monocytes and modulating macrophage polarization.
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