Transient expression of the calcitonin receptor by enteric neurons of the embryonic and early post-natal mouse |
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Authors: | Peter J Wookey Kirsty Turner John B Furness |
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Institution: | (1) Department of Medicine at Austin Health, University of Melbourne, Parkville, VIC, 3010, Australia;(2) Department of Anatomy and Cell Biology, University of Melbourne, Parkville, VIC, 3010, Australia; |
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Abstract: | Calcitonin receptor-immunoreactivity (CTR-ir) was found in enteric neurons of the mouse gastrointestinal tract from embryonic
day 13.5 (E13.5) to post-natal day 28 (P28). CTR-ir occurred in cell bodies in ganglia of the myenteric plexus extending from
the esophagus to the colon and in nerve cells of the submucosal ganglia of the small and large intestines. CTR-ir was also
found in vagal nerve trunks and mesenteric nerves. Counts in the ileal myenteric plexus revealed CTR-ir in 80% of neurons.
CTR-ir was clearly evident in the cell bodies of enteric neurons by E15.5. The immunoreactivity reached maximum intensity
between P1.5 and P12 but was weaker at P18 and barely detectable at P28. The receptor was detected in nerve processes in the
intestine for only a brief period around E17.5, when it was present in one to two axonal processes per villus in the small
intestine. In late gestation and soon after birth, CTR-ir was also evident in the mucosal epithelium. The perinatal expression
of CTR within the ENS suggests that the calcitonin/CTR system may have a role in the maturation of enteric neurons. Signals
may reach enteric neurons in milk, which contains high levels of calcitonin. |
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