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Using Enzyme-based Biosensors to Measure Tonic and Phasic Glutamate in Alzheimer's Mouse Models
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Glutamate signaling in bone.

Karen S Brakspear1, Deborah J Mason

  • 1Department of Physiology and Pharmacology, Bristol University, Bristol, UK.

Frontiers in Endocrinology
|August 14, 2012
PubMed
Summary
This summary is machine-generated.

Mechanical loading regulates bone formation by influencing glutamate signaling. This study identifies glutamate transporters, like GLAST (EAAT1), as key players in bone

Keywords:
EAATboneglutamateosteoblast

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Area of Science:

  • Bone physiology and mechanobiology
  • Neuroscience and cell signaling

Background:

  • Mechanical loading is crucial for bone adaptation, but the underlying signaling pathways remain incompletely understood.
  • The glutamate signaling pathway, involving the excitatory amino acid glutamate, is implicated in bone's response to mechanical stimuli.
  • Key components of the glutamate pathway, including transporters and receptors, are present in bone tissue.

Purpose of the Study:

  • To review the role of the glutamate signaling pathway in bone physiology.
  • To emphasize the function of glutamate transporters, specifically GLAST (EAAT1), in osteoblasts.
  • To explore the initiation and physiological significance of glutamate signaling in bone.

Main Methods:

  • Review of existing literature on glutamate signaling in bone.
  • Analysis of gene expression changes (GLAST mRNA) in osteocytes under mechanical load.
  • In vitro and in vivo studies examining the effects of glutamate receptor activation on bone cells and mass.

Main Results:

  • Mechanical loading of the rat ulna led to down-regulation of GLAST (EAAT1) mRNA in osteocytes.
  • Functional components of the glutamate pathway are present in bone, suggesting a role in bone cell communication.
  • Glutamate receptor activation influences osteoblast and osteoclast phenotypes and regulates bone mass in vivo.

Conclusions:

  • The glutamate signaling pathway is actively involved in the bone mechanotransduction process.
  • Glutamate transporters, such as GLAST (EAAT1), play a significant role in regulating bone cell function and adaptation.
  • Further research is needed to fully elucidate the initiation and physiological importance of glutamatergic signaling in bone.