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Digestive Diseases and Sciences

, Volume 57, Issue 2, pp 364–370 | Cite as

Localization of Nerve Fibers in Colonic Polyps, Adenomas, and Adenocarcinomas by Immunocytochemical Staining for PGP 9.5

  • Tatsuo Tomita
Original Article

Abstract

Background

PGP 9.5 is a cytoplasmic protein and is a specific marker for neurites and neurons.

Aims

Using anti-PGP 9.5, this study aimed to localize nerve fibers in normal colons, polyps, adenomas and adenocarcinomas.

Methods

Colonic polyps, adenomas and T1 to T3 adenocarcinomas with adjacent normal colon were immunostained for PGP 9.5 using rabbit anti-PGP 9.5.

Results

In normal colon, numerous nerve fibers were localized in inner and outer muscles, from which submucosa and lamina propria were innervated. In hyperplastic polyps and tubular adenomas, the stalk revealed Meissner’s plexus and large-diameter nerve fibers, and fine nerve fibers innervated abundantly in lamina propria of hyperplastic polyps and small tubular adenomas. In villous adenomas, large-diameter nerve fibers and Meissner’s plexus were localized in the stalk whereas a few or no fine nerve fibers were localized in fine stroma. In adenocarcinomas, more fine fibers were localized in submucosal stroma adjacent to the invading carcinoma in T1 carcinomas but there were no nerve fibers in the midst of tumors in T2 and T3 carcinomas. There were focally and sporadically increased nerve fibers adjacent to invading cancer nests in 5 of 8 T2 cases. In T3 carcinomas, fragmented Auerbach’s plexus were noted in cancer-invaded colonic muscles and there were no increased fine nerve fibers in the cancer-invaded subserosa in the majority of cases. PGP 9.5 immunostaining revealed tumor-associated neurogenesis in submucosa but no obviously increased nerve fibers within cancer-invaded muscles.

Conclusions

This lack of tumor-associated neurogenesis supports insidious and often silent clinical presentation of colonic carcinomas until invading through the colonic wall to adjacent organs.

Keywords

Colonic adenoma Adenocarcinoma Colonic carcinoma Immunocytochemistry Nerve PGP 9.5 

Notes

Acknowledgments

I sincerely thank Dr Ov Slayden for allowing me to use his research laboratory to perform immununocytochemical staining at Reproductive Science Division, Oregon National Primate Center, Beaverton, OR. This study was supported in part by ONRRC Core Grant NIH RR 000163.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of Pathology and Oregon National Primate CenterOregon Health and Science UniversityPortlandUSA
  2. 2.Oregon National Primate CenterBeavertonUSA

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