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Substance P innervation of the rat thymus

Peptides, ISSN: 0196-9781, Vol: 11, Issue: 6, Page: 1269-1275
1990
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Article Description

Immunohistochemistry for substance P (SP) in the rat thymus revealed fine varicose neural profiles in specific regions of the thymus. Thymic SP innervation was abundant within the capsule and interlobular septa. The majority of SP+ nerve fibers within the septa were free of vascular association, although some fibers were associated with the vasculature deep within the septa. SP+ nerve fibers entered the thymic cortex from the septa and distributed among cortical thymocytes and mast cells. Along the corticomedullary junction, SP+ nerve fibers were found in association with the vasculature. The medullary region of the thymus received only a sparse innervation of SP+ fibers. In addition, SP+ nerve fibers coursed adjacent to OX-8+ cells and mast cells in the extrathymic connective tissue surrounding the thymus. The present study provides evidence that SP is present in nerve fibers in the thymus, and may be available to interact with thymocytes, mast calls, and other cells in the thymus, and affect their development and function.

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