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Expression and Localization of PRiMA-Linked Globular Form Acetylcholinesterase in Vertebrate Neuromuscular Junctions

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Abstract

Acetylcholinesterase (AChE) is well known to process different molecular forms via the distinct interacting partners. Proline-rich membrane anchor (PRiMA)-linked tetrameric globular AChE (G4 AChE) is mainly found in the vertebrate brain; however, recent studies from our laboratory have suggested its existence at neuromuscular junctions (nmjs). Both muscle and motor neuron express AChE at the nmjs. In muscle, the expression of PRiMA-linked AChE is down-regulated during myogenic differentiation and by motor neuron innervation. As compared with muscle, spinal cord possessed higher total AChE activity and contained PRiMA-linked AChE forms. The spinal cord expression of this form increased during development. More importantly, PRiMA-linked G4 AChE identified as aggregates localized at nmjs. These findings suggest that the restricted localization of PRiMA-linked G4 AChE at the nmjs could be contributed by the pre-synaptic motor neuron and/or the post-synaptic muscle fiber.

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Acknowledgements

The research was supported by grants from Research Grants Council (HKUST6419/06M, 662407, 662608, and N_HKUST629/07) of the Hong Kong SAR to KWKT.

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Correspondence to Karl W. K. Tsim.

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Proceedings of the XIII International Symposium on Cholinergic Mechanisms

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Tsim, K.W.K., Leung, K.W., Mok, K.W. et al. Expression and Localization of PRiMA-Linked Globular Form Acetylcholinesterase in Vertebrate Neuromuscular Junctions. J Mol Neurosci 40, 40–46 (2010). https://doi.org/10.1007/s12031-009-9251-2

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  • DOI: https://doi.org/10.1007/s12031-009-9251-2

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