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Immmunohistochemical Study of the Blood and Lymphatic Vasculature and the Innervation of Mouse Gut and Gut‐Associated Lymphoid Tissue

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The blood and lymphatic vascular system of the gut plays an important role in tissue fluid homeostasis, nutrient absorption and immune surveillance. To obtain a better understanding of the anatomic basis of these functions, the blood and lymphatic vasculature of the lower segment of mouse gut and several constituents of gut‐associated lymphoid tissue (GALT) including Peyer's patch, specialized lymphoid nodules in the caecum, small lymphoid aggregates and lymphoid nodules in the colon were studied by using confocal microscopy. Additionally, the innervation and nerve/immune cell interactions in the gut and Peyer's patch were investigated by using cell surface marker PGP9.5 and Glial fibrillary acidic protein (GFAP). In the gut and Peyer's patch, the nerves have contact with B cell, T cell and B220CD3 double‐positive cells. Dendritic cells, the most important antigen‐presenting cells, were closely apposed to some nerves. Some dendritic cells formed membrane–membrane contact with nerve terminals and neuron cell body. Many fine nerve fibres, which are indirectly detected by GFAP, have contact with dendritic cells and other immune cells in the Peyer's patch. Furthermore, the expression of Muscarinic Acetylcholine receptor (subtype M2) was characterized on dendritic cells and other cell population. These findings are expected to provide a route to understand the anatomic basis of neuron‐immune regulation/cross‐talk and probably neuroinvasion of prion pathogens in the gut and GALT.
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Document Type: Research Article

Affiliations: 1: Histopathology Unit, German Research Centre of Biotechnology, Mascheroder Weg 1, Braunschweig, D-38124, Germany; 2: Addresses of authors: Department of Molecular Biotechnology, German Research Centre of Biotechnology, Mascheroder Weg 1, Braunschweig, D-38124, Germany;

Publication date: February 1, 2007

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