title: Electromagnetic fields as first messenger in biological signaling: Application to calmodulin-dependent signaling in tissue repair.
abstract: BACKGROUND
  The transduction mechanism for non-thermal electromagnetic field (EMF) bioeffects has not been fully elucidated. This study proposes that an EMF can act as a first messenger in the calmodulin-dependent signaling pathways that orchestrate the release of cytokines and growth factors in normal cellular responses to physical and/or chemical insults.
  
  
  METHODS
  Given knowledge of Ca(2+) binding kinetics to calmodulin (CaM), an EMF signal having pulse duration or carrier period shorter than bound Ca(2+) lifetime may be configured to accelerate binding, and be detectable above thermal noise. New EMF signals were configured to modulate calmodulin-dependent signaling and assessed for efficacy in cellular studies.
  
  
  RESULTS
  Configured EMF signals modulated CaM-dependent enzyme kinetics, produced several-fold increases in key second messengers to include nitric oxide and cyclic guanosine monophosphate in chondrocyte and endothelial cultures and cyclic adenosine monophosphate in neuronal cultures. Calmodulin antagonists and downstream blockers annihilated these effects, providing strong support for the proposed mechanism.
  
  
  CONCLUSIONS
  Knowledge of the kinetics of Ca(2+) binding to CaM, or for any ion binding specific to any signaling cascade, allows the use of an electrochemical model by which the ability of any EMF signal to modulate CaM-dependent signaling can be assessed a priori or a posteriori. Results are consistent with the proposed mechanism, and strongly support the Ca/CaM/NO pathway as a primary EMF transduction pathway.
  
  
  CONCLUSIONS
  The predictions of the proposed model open a host of significant possibilities for configuration of non-thermal EMF signals for clinical and wellness applications that can reach far beyond fracture repair and wound healing.
authors: Departments of Biomedical Engineering, Columbia University and Orthopedics, Mount Sinai School of Medicine, New York, NY, United States. aap1@columbia.edu
authors: Arthur
authors: A
authors: Pilla
authors: Robert
authors: R
authors: Fitzsimmons
authors: David
authors: D
authors: Muehsam
authors: June
authors: J
authors: Wu
authors: Christine
authors: C
authors: Rohde
authors: Diana
authors: D
authors: Casper
mesh_terms: D002147:Calmodulin / Q000378:metabolism*; D002474:Cell-Free System; D002478:Cells, Cultured; D004574:Electromagnetic Fields; D006801:Humans; D015398:Signal Transduction
chemical_list: D002147:Calmodulin