Bone anabolic responses to mechanical load in vitro involve COX-2 constitutive NOS

J. G. Kunnel, K. Igarashi, J. L. Gilbert, Paula H. Stern

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Mechanical stimulation is essential for maintaining the homeostasis and architecture of connective tissues including bone. The purpose of our study was to test the importance of several potential signaling intermediates in the anabolic responses of bone to loads applied with a newly developed micromechanical loading device. Tibial bones excised from 7- to 8-day-old CD-1 mice were cyclically loaded at 1 Hz, 1000 μE (microstrain) at a peak load of 100 mN. DNA and protein synthesis were evaluated by measuring the incorporation of 3H-thymidine and 14C-proline, respectively. The roles of cyclooxygenase (COX) isoforms, nitric oxide synthase (NOS) isoforms, and glutamate receptor-gated Ca2+ channeling were examined by incubating the bones in the presence of each of their specific inhibitors. The results indicate that COX-2 and constitutive NOS are important signaling molecules in the anabolic responses of neonatal tibial bone to the micromechanical load in vitro.

Original languageEnglish (US)
Pages (from-to)40-49
Number of pages10
JournalConnective tissue research
Issue number1
StatePublished - 2004


  • Bone
  • Cylooxygenase
  • Glutamate receptor
  • Mechanical loading
  • Nitric oxide synthase

ASJC Scopus subject areas

  • Rheumatology
  • Biochemistry
  • Orthopedics and Sports Medicine
  • Molecular Biology
  • Cell Biology


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