Abstract
Vagal gastrointestinal (GI) afferents are essential for the regulation of eating, body weight, and digestion. However, their functional organization and the way that this develops are poorly understood. Neurotrophin-3 (NT-3) is crucial for the survival of vagal sensory neurons and is expressed in the developing GI tract, possibly contributing to their survival and to other aspects of vagal afferent development. The identification of the functions of this peripheral NT-3 thus requires a detailed understanding of the localization and timing of its expression in the developing GI tract. We have studied embryos and neonates expressing the lacZ reporter gene from the NT-3 locus and found that NT-3 is expressed predominantly in the smooth muscle of the outer GI wall of the stomach, intestines, and associated blood vessels and in the stomach lamina propria and esophageal epithelium. NT-3 expression has been detected in the mesenchyme of the GI wall by embryonic day 12.5 (E12.5) and becomes restricted to smooth muscle and lamina propria by E15.5, whereas its expression in blood vessels and esophageal epithelium is first observed at E15.5. Expression in most tissues is maintained at least until postnatal day 4. The lack of colocalization of β-galactosidase and markers for myenteric ganglion cell types suggests that NT-3 is not expressed in these ganglia. Therefore, NT-3 expression in the GI tract is largely restricted to smooth muscle at ages when vagal axons grow into the GI tract, and when vagal mechanoreceptors form in smooth muscle, consistent with its role in these processes and in vagal sensory neuron survival.
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Acknowledgements
We are grateful to Louis Reichardt (University of California, San Francisco) for NT-3 lacZ mice, to Thomas Finger (University of Colorado, Denver) for the guinea pig β-galactosidase antibody, and to Tom Karam for animal care and breeding. Preliminary reports of the present findings were presented in abstract form at the IVth International Congress of the International Society for Autonomic Neuroscience, in a review based on this presentation (Fox 2006), and in abstract form at the 36th and 38th annual meetings of the Society for Neuroscience.
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This work was supported by NIH grant NS046716.
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Supplementary Fig. 1
NT-3 expression patterns in the large intestine at E13.5. Photomicrographs of X-gal-stained large intestine sections are shown on the left (a,c,e) and adjacent (b and f) or semi-adjacent (d) sections counterstained with neutral red to their right. NT-3 expression in the large intestine within the abdomen of some embryos at E13.5 (a-f) occurred throughout the mesenchyme (a,b), but in other specimens at some anterior-posterior levels (c-f) the outer muscle wall had begun to differentiate, and in parallel NT-3 expression became largely restricted to this tissue layer. There was no expression in the epithelium. Scale bars = 50 μm; the bar in d also applies to a-c and the bar in f also applies to e. Abbreviations as for Figs. 1-3 (GIF 575 KB)
Supplementary Fig. 2
NT-3 expression patterns in the large intestine at E15.5. Photomicrographs of X-gal-stained large intestine sections (a,c) are shown to the left of semi-adjacent sections counterstained with neutral red (b,d). NT-3 expression in the large intestine at E15.5 (a-d) occurred in the circular smooth muscle layer (a-d), and was equally strong in (c), weaker in (d), or absent from (a,b) different segments of the longitudinal smooth muscle layer. By E15.5 folding of the mucosa had begun. Scale bar in d = 100 (m and it applies to a-c. Mesentery, mst; other abbreviations as for Figs. 2 and 3 Supplementary Fig. 3 NT-3 expression pattern in the large intestine at P4. Photomicrographs of X-gal-stained large intestine sections (a,c) are shown to the left of semi-adjacent sections counterstained with neutral red (b,d). At P4, the predominant NT-3 expression in the large intestine occurred in the circular smooth muscle layer (a-d). At this age the mucosa appeared mature. Scale bar in b = 200 (m and in d = 50 (m and they also apply to a and c, respectively. Abbreviations as for Fig. 2 (GIF 348 KB)
Supplementary Fig. 3
NT-3 expression pattern in the large intestine at P4 (abbreviations as for Fig. 2 in main text). Photomicrographs of X-gal-stained large intestine sections (a, c) are shown left and semi-adjacent sections counterstained with neutral red right (b, d). At P4, the predominant NT-3 expression in the large intestine occurred in the circular smooth muscle layer. At this age, the mucosa appeared mature. Bars 200 μm (b), 50 μm (d). (GIF 340 KB)
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Fox, E.A., McAdams, J. Smooth-muscle-specific expression of neurotrophin-3 in mouse embryonic and neonatal gastrointestinal tract. Cell Tissue Res 340, 267–286 (2010). https://doi.org/10.1007/s00441-010-0959-7
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DOI: https://doi.org/10.1007/s00441-010-0959-7