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Characterisation of neurons expressing calbindin immunoreactivity in the ileum of the unweaned and mature sheep

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Abstract

We have identified the enteric neuron types expressing immunoreactivity for the calcium-binding protein calbindin D28k (CALB) in cryostat sections and whole-mount preparations of myenteric (MP) and submucosal (SMP) plexuses of sheep ileum. We wished to determine whether CALB-IR in the sheep enteric nervous system was expressed in Dogiel type II cells, as in guinea-pig and rat ileum, and could therefore be used as a marker for intrinsic primary afferent neurons. The neurochemical coding of CALB-containing myenteric and submucosal neurons in ileum of unweaned lamb and mature sheep and its co-localisation with various neural markers was studied immunohistochemically. An antiserum against neuronal nuclear protein (NeuN) failed to detect the entire neuronal population; it was expressed only in 48% of neuron-specific enolase (NSE)-immunoreactive (NSE-IR) neurons. Human neuronal protein appeared to occur in the large majority or all neurons. Almost all CALB-IR neurons were: (1) radially multidendritic; (2) eccentric multidendritic; (3) Dogiel type II. CALB-IR occurred in 20–25% of myenteric and 65–75% of submucosal neurons in lamb and mature sheep, with higher values in mature sheep. Nearly all CALB-IR neurons were common choline acetyltransferase (cChAT)-IR, whereas only about 20% of cChAT-IR somata were CALB-IR. In lamb and mature sheep, 90% of MP CALB-IR neurons were peripheral choline acetyltransferase (pChAT)-IR. In lamb SMP, 80±13% of CALB-IR cells were also pChAT-IR, whereas all those in mature SMP were pChAT-IR. Fewer myenteric CALB-IR neurons exhibited tachykinin (TK) in mature sheep (49%) than in lamb (88%). This was also the case for submucosal ganglia (mature sheep, 63%; lamb, 89%). In lamb MP, 77±7% of CALB-IR cells were NeuN-positive. In mature sheep, 73±10% of CALB-IR somata were NeuN-IR, but NeuN failed to stain SMP neurons. In the MP of suckling and mature sheep, Dogiel type II CALB-IR neurons were calcitonin gene-related peptide (CGRP)-IR. In the SMP at both stages, Dogiel type II CALB-IR somata (about 50% of CALB-IR neurons) were also CGRP-IR. Only small proportions of CALB-IR neurons showed immunoreactivity for calretinin or nitric oxide synthase (NOS), although large populations of CALB and NOS neurons occurred in the ganglia. Thus, CALB is a marker of most Dogiel type II neurons in the sheep but is not confined to Dogiel II neurons. CGRP is a more selective marker of Dogiel type II neurons, being only found in this neuron type.

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Acknowledgements

We are grateful to Prof. H. Kimura, Molecular Neuroscience Research Center, Shiga University of Medical Science, Seta, Otsu, Japan, who generously provided the antiserum for the peripheral form of ChAT (pChAT). We thank Heather L. Robbins for her invaluable assistance and advice in preparation of tissue for immunohistochemistry.

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Correspondence to Roberto Chiocchetti.

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This work was supported by a grant from the Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR)

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Chiocchetti, R., Grandis, A., Bombardi, C. et al. Characterisation of neurons expressing calbindin immunoreactivity in the ileum of the unweaned and mature sheep. Cell Tissue Res 318, 289–303 (2004). https://doi.org/10.1007/s00441-004-0906-6

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