90006214

open access

Accepted Manuscript

Ultrastructural and Immunohistochemical Study on the Lamina Propria Cells Beneath Paneth Cells in the Rat Ileum

Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology

301(6)

1074-1085

Wiley

2018-01

2019-07-24

This is the peer reviewed version of the following article: Mantani Y, Nishida M, Yamamoto K, Miyamoto K, Yuasa H, Masuda N, et al. Ultrastructural and immunohistochemical study on the lamina propria cells beneath paneth cells in the rat ileum. Anat Rec (Hoboken). (2018) 301:1074–85., which has been published in final form at https://doi.org/10.1002/ar.23778. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

Paneth cells secrete bactericidal substances in response to bacterial proliferation on the mucosal surface without directly contacting bacteria. However, the induction mechanism of this transient secretion has not been clarified, although nervous system and/or immunocompetent cells in the lamina propria (LP) might be involved. In this study, we ultrastructurally and immunohistochemically investigated which LP cells are localized beneath Paneth cells and examined the relationship between the Paneth cell‐derived cellular processes which extended into the LP and the LP cells. The results showed that various cells—including blood capillary, subepithelial stromal cell, and nerve fiber—were present in the LP beneath Paneth cells. Endothelial cells of blood capillary were the cells most frequently found in this location; they were situated within 1 μm of the Paneth cells and possessed fenestration on the surfaces adjacent to Paneth cells. The Paneth cells rarely extended the cellular processes toward the LP across the basal lamina. Most of the cellular processes of Paneth cells contacted the subepithelial stromal cells. Immunohistochemistry revealed that the CD34+CD31−αSMA− stromal cells preferentially localized in the LP beneath the intestinal crypt base, while PDGFRαhiαSMA+ stromal cells mainly localized around the lateral portions of the intestinal crypt and PDGFRαhiαSMA− stromal cells localized in the intestinal villus. From these findings, the existence of blood capillaries beneath Paneth cells might reflect the active exocrine function of Paneth cells. Furthermore, subepithelial stromal cells, probably with a CD34+CD31−αSMA− PDGFRα−/lo phenotype, beneath the crypt base might affect Paneth cell activity by interacting with their cellular processes. Anat Rec, 301:1074–1085, 2018. © 2018 Wiley Periodicals, Inc.

transmission electron microscopy

学術雑誌論文