Imaging Mass Spectrometry of Gastric Carcinoma in Formalin-fixed Paraffin-embedded Tissue Microarray

Overview

Journal Cancer Sci

Specialty Oncology

Date 2009 Dec 8

PMID 19961487

Citations 26

Authors

Yoshifumi Morita

Koji Ikegami

Naoko Goto-Inoue

Takahiro Hayasaka

Nobuhiro Zaima

Hiroki Tanaka

Takashi Uehara

Tomohiko Setoguchi

Takanori Sakaguchi

Hisashi Igarashi

Haruhiko Sugimura

Mitsutoshi Setou

Hiroyuki Konno

Affiliations

Soon will be listed here.

Abstract

The popularity of imaging mass spectrometry (IMS) of tissue samples, which enables the direct scanning of tissue sections within a short time-period, has been considerably increasing in cancer proteomics. Most pathological specimens stored in medical institutes are formalin-fixed; thus, they had been regarded to be unsuitable for proteomic analyses, including IMS, until recently. Here, we report an easy-to-use screening method that enables the analysis of multiple samples in one experiment without extractions and purifications of proteins. We scanned, with an IMS technique, a tissue microarray (TMA) of formalin-fixed paraffin-embedded (FFPE) specimens. We detected a large amount of signals from trypsin-treated FFPE-TMA samples of gastric carcinoma tissues of different histological types. Of the signals detected, 54 were classified as signals specific to cancer with statistically significant differences between adenocarcinomas and normal tissues. We detected a total of 14 of the 54 signals as histological type-specific with the support of statistical analyses. Tandem MS revealed that a signal specific to poorly differentiated cancer tissue corresponded to histone H4. Finally, we verified the IMS-based finding by immunohistochemical analysis of more than 300 specimens spotted on TMAs; the immunoreactivity of histone H4 was remarkably strong in poorly differentiated cancer tissues. Thus, the application of IMS to FFPE-TMA can enable high-throughput analysis in cancer proteomics to aid in the understanding of molecular mechanisms underlying carcinogenesis, invasiveness, metastasis, and prognosis. Further, results obtained from the IMS of FFPE-TMA can be readily confirmed by commonly used immunohistochemical analyses.

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