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Zoekopdracht: faculteit: "ACTA" en publicatiejaar: "2009"

AuteursS.D. Tan, R. Xie, J. Klein Nulend, R.E. van Rheden, A.L.J.J. Bronckers, A.M. Kuijpers-Jagtman, J.W. Von den Hoff, J.C. Maltha
TitelOrthodontic force stimulates eNOS and iNOS in rat osteocytes
TijdschriftJournal of Dental Research
SamenvattingMechanosensitive osteocytes are essential for bone remodeling. Nitric oxide, an important regulator of bone remodeling, is produced by osteocytes through the activity of constitutive endothelial nitric oxide synthase (eNOS) or inducible nitric oxide synthase (iNOS). We hypothesized that these enzymes regulate the tissue response to orthodontic force, and therefore we investigated eNOS and iNOS expression in osteocytes during orthodontic force application. The upper rat molars were moved mesially by NiTi coil springs (10 cN, 120 hrs) in a split-mouth design. Immunohistochemical staining revealed that, in the tension area, eNOS-positive osteocytes increased from 24 hrs on, while iNOS-positive osteocytes remained largely constant. In the compression area, iNOS-positive osteocytes increased after 6 hrs, while eNOS- positive osteocytes increased after 24 hrs. This suggests that eNOS mediates bone formation in the tension area, while iNOS mediates inflammation-induced bone resorption in the compression area. Both eNOS and iNOS seem to be important regulators of bone remodeling during orthodontic force application.
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