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Zoekresultaten

Zoekopdracht: faculteit: "ACTA" en publicatiejaar: "2008"

AuteursS.D. Tan, A.D. Bakker, C.M. Semeins, A.M. Kuijpers-Jagtman, J. Klein-Nulend
TitelInhibition of osteocyte apoptosis by fluid flow is mediated by nitric oxide
TijdschriftBiochemical and Biophysical Research Communications
Jaargang369
Jaar2008
Nummer4
Pagina's1150-1154
ISSN0006291X
FaculteitACTA
SamenvattingBone unloading results in osteocyte apoptosis, which attracts osteoclasts leading to bone loss. Loading of bone drives fluid flow over osteocytes which respond by releasing signaling molecules, like nitric oxide (NO), that inhibit osteocyte apoptosis and alter osteoblast and osteoclast activity thereby preventing bone loss. However, which apoptosis-related genes are modulated by loading is unknown. We studied apoptosis-related gene expression in response to pulsating fluid flow (PFF) in osteocytes, osteoblasts, and fibroblasts, and whether this is mediated by loading-induced NO production. PFF (0.7 ± 0.3 Pa, 5 Hz, 1 h) upregulated Bcl-2 and downregulated caspase-3 expression in osteocytes. l-NAME attenuated this effect. In osteocytes PFF did not affect p53 and c-Jun, but l-NAME upregulated c-Jun expression. In osteoblasts and fibroblasts PFF upregulated c-Jun, but not Bcl-2, caspase-3, and p53 expression. This suggests that PFF inhibits osteocyte apoptosis via alterations in Bcl-2 and caspase-3 gene expression, which is at least partially regulated by NO.
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