Fluid shear stress inhibits TNFalpha-induced osteocyte apoptosis.
J Dent Res
; 85(10): 905-9, 2006 Oct.
Article
in En
| MEDLINE
| ID: mdl-16998129
ABSTRACT
Bone tissue can adapt to orthodontic load. Mechanosensing in bone is primarily a task for the osteocytes, which translate the canalicular flow resulting from bone loading into osteoclast and osteoblast recruiting signals. Apoptotic osteocytes attract osteoclasts, and inhibition of osteocyte apoptosis can therefore affect bone remodeling. Since TNF-alpha is a pro-inflammatory cytokine with apoptotic potency, and elevated levels are found in the gingival sulcus during orthodontic tooth movement, we investigated if mechanical loading by pulsating fluid flow affects TNF-alpha-induced apoptosis in chicken osteocytes, osteoblasts, and periosteal fibroblasts. During fluid stasis, TNF-alpha increased apoptosis by more than two-fold in both osteocytes and osteoblasts, but not in periosteal fibroblasts. One-hour pulsating fluid flow (0.70 +/- 0.30 Pa, 5 Hz) inhibited (-25%) TNF-alpha-induced apoptosis in osteocytes, but not in osteoblasts or periosteal fibroblasts, suggesting a key regulatory role for osteocyte apoptosis in bone remodeling after the application of an orthodontic load.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Osteoblasts
/
Osteocytes
/
Tumor Necrosis Factor-alpha
/
Bone Remodeling
/
Apoptosis
Limits:
Animals
Language:
En
Journal:
J Dent Res
Year:
2006
Document type:
Article
Affiliation country: