Overexpression of Insulin-like Growth Factor Binding Protein 3 in Colorectal Carcinoma Identified by cDNA Microarray and Immunohistochemical Analysis
최경운, 박도윤, 김지연, 이진숙, 설미영,
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최경운 ( Choi Kyung-Un )
부산대학교 의과대학 병리학교실
박도윤 ( Park Do-Youn )
부산대학교 의과대학 병리학교실
김지연 ( Kim Jee-Yeon )
부산대학교 의과대학 병리학교실
이진숙 ( Lee Jin-Sook )
부산대학교 의과대학 병리학교실
설미영 ( Sol Mi-Young )
부산대학교 의과대학 병리학교실
KMID : 0357920030370030166
Abstract
Background: Insulin-like growth factor binding protein 3 (IGFBP3), a member of six proteins with a high affinity for insulin-like growth factors (IGFs), seems to modulate the effects of IGFs on cells and to regulate cell proliferation through the IGF-independent pathway. We assessed the role of IGFBP3 in the colorectal carcinoma detected by cDNA microarray.
Methods: To identify molecular alterations in the colorectal carcinoma, we analyzed gene expression profiles of the colorectal adenocarcinoma by means of a cDNA microarray representing 7,500 genes. Of the differentially expressed genes, the author assessed the insulin-like growth factor binding protein 3 (IGFBP3) gene at the protein level using immunohistochemistry.
Results: The expressions of 21 and 16 genes were noted to have more than fivefold increases or decreases in the colonic adenocarcinoma tissue compared with the noncancerous colonic mucosal tissue. The differentially expressed genes include those associated with cell proliferation/apoptosis, signal transduction/transcription, metabolizing enzymes, cytoskeleton, angiogenesis, ion channel, extracellular matrix and others. Of the total 68 cases of colorectal adenocarcinomas observed, 34 cases (50%) showed positive immunohistochemical stainings for IGFBP3.
Conclusion: In this study, it is suggested that IGFBP3 plays a role in colorectal carcinogenesis. And combining an immunohistochemistry with a cDNA microarray can facillitate the rapid characterization of a candidate novel molecular target.
키워드
Colorectal Neoplasms;Insulin;Like Growth;Factor;Binding Proteins;cDNA microarrays;Immunohistochemistry
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