Nitric oxide production by bone cells is fluid shear stress rate dependent.
Shear stress due to mechanical loading-induced flow of interstitial fluid through the lacuno-canalicular network is a likely signal for bone cell adaptive responses. Moreover, the rate (determined by frequency and magnitude) of mechanical loading determines the amount of bone formation. Whether the bone cells' response to fluid shear stress is rate dependent is unknown. Here we investigated whether bone cell activation by fluid shear stress is rate dependent. MC3T3-E1 osteoblastic cells were subjected for 15 min to fluid shear stress of varying frequencies and amplitudes, resulting in peak fluid shear stress rates ranging from 0 to 39.6 Pa-Hz. Nitric oxide production, a parameter for bone cell activation, was found to be linearly dependent on the fluid shear stress rate; the slope was steepest at 5 min (0.11 Pa-Hz(-1)) and decreased to 0.03 Pa-Hz(-1) at 15 min. We conclude that the fluid shear stress rate is an important parameter for bone cell activation.
Department of Oral Cell Biology, Academic Centre for Dentistry Amsterdam-Vrije Universiteit, Amsterdam, The Netherlands.
Rommel G
RG
Bacabac
Theo H
TH
Smit
Margriet G
MG
Mullender
Saskia J
SJ
Dijcks
Jack J W A
JJ
Van Loon
Jenneke
J
Klein-Nulend
D000818:Animals; D001696:Biomechanical Phenomena; D015374:Biosensing Techniques / Q000379:methods; D001842:Bone and Bones / Q000166:cytology / Q000378:metabolism*; D002478:Cells, Cultured; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D008297:Male; D051379:Mice; D009569:Nitric Oxide / Q000096:biosynthesis*; D011673:Pulsatile Flow; D012044:Regression Analysis; D013314:Stress, Mechanical; D016138:Walking
D009569:Nitric Oxide