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Innervation of the pancreas by neurons in the gut

AL Kirchgessner and MD Gershon
Journal of Neuroscience 1 May 1990, 10 (5) 1626-1642; DOI: https://doi.org/10.1523/JNEUROSCI.10-05-01626.1990
AL Kirchgessner
Department of Anatomy and Cell Biology, Columbia University College of Physicians and Surgeons, New York, New York 10032.
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MD Gershon
Department of Anatomy and Cell Biology, Columbia University College of Physicians and Surgeons, New York, New York 10032.
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Abstract

Experiments were done in order to test the hypothesis that neurons in the bowel send axonal projections to the pancreas and can modify pancreatic activity. pancreatic injections of the retrograde tracer, Fluoro-Gold, labeled neurons in the myenteric plexus of the antrum of the stomach and in the first 6 cm of the duodenum. this labeling was not due to the diffusion of Fluoro-Gold from the pancreas, because the injections did not label longitudinal muscle cells overlying labeled ganglia in the bowel or neurons in the phrenic nerve nucleus or nucleus ambiguous; nor were enteric neurons labeled if insufficient time was allotted for retrograde transport. More Fluoro-Gold labeled neurons were found in the stomach (9.2 +/- 0.9/ganglion) than in the duodenum (3.8 +/- 0.3/ganglion; p less than 0.001). Neurons were found in myenteric ganglia of both duodenum and stomach that were doubly labeled by retrograde transport of Fluoro-Gold and anti-serotonin (5-HT) sera. In addition, thick bundles of 5-HT immunoreactive nerve trunks were found to run between the duodenum and the pancreas. Most 5-HT immunoreactive axons in the pancreas terminated in ganglia, although some fibers were also observed near acini, ducts, vessels, and islet cells. The B subunit of cholera toxin (B-CT) was microinjected into single myenteric ganglia in order to determine if axon terminals in the pancreas would become labeled by anterograde transport in the pancreas. B-CT labeled bundles of axons in the pancreatic stroma. Branches of these bundles entered the pancreatic parenchyma and varicose B-CT labeled terminal axons were found in pancreatic ganglia and in proximity to acinar and insulin immunoreactive cells. The intercalating fluorochrome 1, 1′, dioctadecyl–3,3,3′,3′-tetramethylcarbocyanine perchlorate (Dil), which moves by lateral diffusion to outline entire cells, was introduced by microinjection into individual myenteric ganglia of fixed preparations. Fluorescence was seen in sequential observations to move away from the injected ganglion along connectives of the myenteric plexus. After about a month, neurons in ganglia at some distance from the injection site displayed Dil fluorescence as did nerve bundles that exited from the myenteric plexus and pierced the longitudinal muscle in the direction of the pancreas. Varicose Dil fluorescent terminal varicosities were also observed int he pancreas. These observations indicate that there is an extensive entero- pancreatic innervation.(ABSTRACT TRUNCATED AT 400 WORDS)

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The Journal of Neuroscience: 10 (5)
Journal of Neuroscience
Vol. 10, Issue 5
1 May 1990
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Innervation of the pancreas by neurons in the gut
AL Kirchgessner, MD Gershon
Journal of Neuroscience 1 May 1990, 10 (5) 1626-1642; DOI: 10.1523/JNEUROSCI.10-05-01626.1990

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Innervation of the pancreas by neurons in the gut
AL Kirchgessner, MD Gershon
Journal of Neuroscience 1 May 1990, 10 (5) 1626-1642; DOI: 10.1523/JNEUROSCI.10-05-01626.1990
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