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Cerebellar choline acetyltransferase positive mossy fibres and their granule and unipolar brush cell targets: a model for central cholinergic nicotinic neurotransmission

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Journal of Neurocytology

Summary

A subset of cerebellar mossy fibres is rich in choline acetyltransferase, the rate-limiting enzyme for the synthesis of acetylcholine. These choline acetyltransferase-positive mossy fibres are concentrated in the vestibulocerebellum and originate predominantly from the medial vestibular nucleus. The granular layer of the vestibulocerebellum is also enriched in unipolar brush cells, an unusual type of small neuron that form giant synapses with mossy fibres. In this immunocytochemical light and electron microscopic study, we explored whether choline acetyltransferase-positive mossy fibres innervate unipolar brush cells of the rat cerebellum. We utilized monoclonal antibodies to rat choline acetyltransferase of proven specificity, and immunoperoxidase procedures with 3,3′-diaminobenzidine tetrahydrochloride as the chromogen. A high density of choline acetyltransferase-positive fibres occurred in the nodulus and ventral uvula, where they showed an uneven, zonal distribution. Immunostained mossy fibre rosettes contained high densities of round synaptic vesicles and mitochondria. They formed asymmetric synaptic junctions with dendritic profiles of both granule cells and unipolar brush cells. The synaptic contacts between choline acetyltransferase-immunoreactive mossy fibres and unipolar brush cells were very extensive, and did not differ from synapses of choline acetyltransferase-negative mossy fibres with unipolar brush cells. Analysis of a total area of 1.25 mm2 of the nodulus from three rats revealed that 14.2% of choline acetyltransferase-immunoreactive mossy fibre rosettes formed synapses with unipolar brush cells profiles. Choline acetyltransferase-positive rosettes accounted for 21.7% of the rosettes forming synapses with unipolar brush cells. Thus, the present data demonstrate that unipolar brush cells are innervated by a heterogeneous population of mossy fibres, and that some unipolar brush cells receive cholinergic synaptic input from the medial vestibular nucleus. The ultrastructure of these synapses is compatible with the possibility that choline acetyltransferase-positive mossy fibres co-release acetylcholine and glutamate. As the granular layer of the vestibulocer-ebellum contains nicotinic binding sites, the choline acetyltransferase-positive mossy fibres may be a model for studying nicotinic neurotransmission in the CNS.

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Authors and Affiliations

  1. Northwestern University Institute for Neuroscience, 5-475 Searle Building, 320 East Superior Street, 60611-S205, Chicago, IL, USA

    D. Jaarsma, M. R. Diño & E. Mugnaini

  2. Department of Anatomy, Erasmus University, P.O. Box 1738, 3000 DR, Rotterdam, The Netherlands

    D. Jaarsma

  3. Institute for Cell Biology, CNR, Via C. Marx 23, OO137, Rome, Italy

    C. Cozzari

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  1. D. Jaarsma
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Jaarsma, D., Diño, M.R., Cozzari, C. et al. Cerebellar choline acetyltransferase positive mossy fibres and their granule and unipolar brush cell targets: a model for central cholinergic nicotinic neurotransmission. J Neurocytol 25, 829–842 (1996). https://doi.org/10.1007/BF02284845

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