Abstract
ATP is co-stored and co-released with acetylcholine (ACh) at the pre-synaptic vesicles in vertebrate neuromuscular junction (nmj). Several lines of studies demonstrated that binding of ATP to its corresponding P2Y1 and P2Y2 receptors in the muscle regulated post-synaptic gene expressions. To further support the notion that P2Y receptors are playing indispensable role in formation of post-synaptic specifications at the nmj, the knock-out mice of P2Y1 receptor (P2Y1R -/-) were employed here for analyses. In P2Y1R -/- mice, the expression of P2Y2 receptor in muscle was reduced by over 50 %, as compared to P2Y1R +/+ mice. In parallel, the expression of acetylcholinesterase (AChE) in muscle was markedly decreased. In the analysis of the expression of anchoring subunits of AChE in P2Y1R -/- mice, the proline-rich membrane anchor (PRiMA) subunit was reduced by 60 %; while the collagen tail (ColQ) subunit was reduced by 50 %. AChE molecular forms in the muscle were not changed, except the amount of enzyme was reduced. Immuno-staining of P2Y1R -/- mice nmj, both AChE and AChR were still co-localized at the nmj, and the staining was diminished. Taken together our data demonstrated that P2Y1 receptor regulated the nmj gene expression.
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Abbreviations
- ACh:
-
Acetylcholine
- nmj:
-
Neuromuscular junction
- AChE:
-
Acetylcholinesterase
- PRiMA:
-
Proline-rich membrane anchor
- ColQ:
-
Collagen tail
- G4 :
-
Tetrameric globular form
- A12 :
-
Asymmetric form
- TMR-BuTX:
-
Tetramethylrhodamine-conjugated α-bungarotoxin
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Acknowledgments
This research was supported by Hong Kong Research Grants Council Theme-based Research Scheme (T13-607/12R), GRF (661110, 662911, 660411, 663012, 662713), TUYF12SC02, TUYF12SC03, TUYF15SC01, The Hong Kong Jockey Club Charities Trust and Foundation of The Awareness of Nature (TAON12SC01) to Tsim.
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Xu, M.L., Bi, C.W., Cheng, L.K. et al. Reduced Expression of P2Y2 Receptor and Acetylcholinesterase at Neuromuscular Junction of P2Y1 Receptor Knock-out Mice. J Mol Neurosci 57, 446–451 (2015). https://doi.org/10.1007/s12031-015-0591-9
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DOI: https://doi.org/10.1007/s12031-015-0591-9