Demonstration of direct neurite-osteoclastic cell communication in vitro via the adrenergic receptor.
There is currently great interest in the bone metabolism induced by the sympathetic nerve system. Recently, direct neurite-osteoblastic cell communication was demonstrated using an in vitro co-culture model comprising neurite-sprouting murine superior cervical ganglia and MC3T3-E1 osteoblast-like cells. In the present study, we examined whether the direct nerve-osteoclastic cell communication was present in an in vitro co-culture model comprising cultured murine superior cervical ganglia and mouse osteoclast-like cells. RAW264.7 cells treated with receptor activator of NF-kappaB ligand were used as osteoclast-like cells. We found that the addition of scorpion venom (SV) elicited neurite activation via intracellular Ca(2+) mobilization and, after a lag period, osteoclastic Ca(2+) mobilization in the co-culture. SV did not have any direct effect on the osteoclastic cells in the absence of the neurites. The addition of an alpha(1)-adrenergic receptor (AR) antagonist, prazosin, concentration-dependently prevented the osteoclastic activation that resulted as a consequence of neural activation by SV. We also found that alpha(1)-adrenergic receptor agonists evoked transient Ca(2+) mobilization and gene expression of interleukin-6 in osteoclastic cells. These results demonstrate that osteoclastic activation occurs via alpha(1)-AR in osteoclastic cells as a direct response to neuronal activation.
Suga
Satoko
S
Department of Pharmacology, School of Dentistry, Aichi-Gakuin University, Nagoya, Japan.
Goto
Shigemi
S
Togari
Akifumi
A
D000316:Adrenergic alpha-Agonists / Q000494:pharmacology; D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology; D000818:Animals; D002118:Calcium / Q000378:metabolism; D002450:Cell Communication; D002460:Cell Line; D018920:Coculture Techniques; D005786:Gene Expression Regulation / Q000187:drug effects; D015850:Interleukin-6 / Q000235:genetics; D008264:Macrophages / Q000378:metabolism; D051379:Mice; D016501:Neurites / Q000187:drug effects / Q000378:metabolism*; D010010:Osteoclasts / Q000187:drug effects / Q000378:metabolism*; D011224:Prazosin / Q000494:pharmacology; D018340:Receptors, Adrenergic, alpha-1 / Q000187:drug effects / Q000378:metabolism*; D012604:Scorpion Venoms / Q000494:pharmacology; D017783:Superior Cervical Ganglion / Q000378:metabolism*; D013997:Time Factors
D000316:Adrenergic alpha-Agonists; D000317:Adrenergic alpha-Antagonists; D015850:Interleukin-6; D018340:Receptors, Adrenergic, alpha-1; D012604:Scorpion Venoms; D002118:Calcium; D011224:Prazosin