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Mol Cell Endocrinol. 2014 Mar 25;384(1-2):155-64. doi: 10.1016/j.mce.2014.01.021. Epub 2014 Feb 5.

Acetylcholine affects osteocytic MLO-Y4 cells via acetylcholine receptors.

Author information

1
Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou 510055, China; Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, China.
2
State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; Department of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China.
3
Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Chongqing 400016, China; The Affiliated Hospital of Stomatology, Chongqing Medical University, Chongqing 400016, China.
4
State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
5
State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China; Department of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, China. Electronic address: wanghang@scu.edu.cn.

Abstract

The identification of the neuronal control of bone remodeling has become one of the many significant recent advances in bone biology. Cholinergic activity has recently been shown to favor bone mass accrual by complex cellular regulatory networks. Here, we identified the gene expression of the muscarinic and nicotinic acetylcholine receptors (m- and nAChRs) in mice tibia tissue and in osteocytic MLO-Y4 cells. Acetylcholine, which is a classical neurotransmitter and an osteo-neuromediator, not only influences the mRNA expression of the AChR subunits but also significantly induces the proliferation and viability of osteocytes. Moreover, acetylcholine treatment caused the reciprocal regulation of RANKL and OPG mRNA expression, which resulted in a significant increase in the mRNA ratio of RANKL:OPG in osteocytes via acetylcholine receptors. The expression of neuropeptide Y and reelin, which are two neurogenic markers, was also modulated by acetylcholine via m- and nAChRs in MLO-Y4 cells. These results indicated that osteocytic acetylcholine receptors might be a new valuable mediator for cell functions and even for bone remodeling.

KEYWORDS:

Acetylcholine; Acetylcholine receptors; Osteocytes

PMID:
24508663
DOI:
10.1016/j.mce.2014.01.021
[Indexed for MEDLINE]
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