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[Functional expression of machineries for glutamate signaling in bone]

Yukio Yoneda1, Eiichi Hinoi

  • 1Laboratory of Molecular Pharmacology, Kanazawa University Graduate School of Natural Science and Technology, Kanazawa, 920-0934, Japan.

Nihon Yakurigaku Zasshi. Folia Pharmacologica Japonica
|January 20, 2004
PubMed

Insights

Glutamate receptors and transporters are present in rat osteoblasts, influencing cell proliferation and differentiation. Blocking NMDA receptors and modulating other glutamate pathways affects key osteoblast functions like alkaline phosphatase activity and calcium accumulation.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Context:

  • Glutamate receptors (GluRs) and transporters are crucial in neuronal signaling.
  • Their role in non-neuronal cells, such as osteoblasts, is less understood.
  • Rat calvarial osteoblasts express various glutamate signaling molecules.

Purpose:

  • To investigate the functional expression and role of glutamate receptors and transporters in rat calvarial osteoblasts.
  • To determine the impact of specific glutamate receptor modulators on osteoblast activity.

Summary:

  • RT-PCR confirmed mRNA expression for GluRs, glutamate transporters, and vesicular glutamate transporters in rat osteoblasts.
  • NMDA receptor antagonist MK-801 inhibited alkaline phosphatase activity, Ca2+ accumulation, and CBFA1 DNA binding.
  • AMPA increased glutamate release, and L-AP4 (group III mGluR agonist) inhibited PTH-induced cAMP accumulation.

Impact:

  • Suggests a role for glutamate signaling in osteoblast proliferation and differentiation.
  • Highlights potential therapeutic targets for bone-related disorders by modulating glutamate pathways.
  • Provides evidence for functional glutamate transport in osteoblasts.

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