Downregulation of cornulin in esophageal squamous cell carcinoma

Jyothi, Sharma and Prasad, Keshava TS (2013) Downregulation of cornulin in esophageal squamous cell carcinoma. Acta Histochemica, 115 (2). pp. 89-99. ISSN 0065-1281

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Early events in the development of esophageal squamous cell carcinoma (ESCC) are poorly understood and many of the key molecules involved have not yet been identified. We previously used isobaric tags for a relative and absolute quantitation (iTRAQ)-based quantitative proteomics approach to identify differentially expressed proteins in ESCC tissue as compared to the adjacent normal mucosa. Cornulin was identified as one of the major downregulated molecules in ESCC. Cornulin is a member of the S100 fused-type protein family, which has an EF-hand calcium binding motif and multiple tandem repeats of specific peptide motifs. Cornulin was 5-fold downregulated in ESCC as compared to normal epithelium mirroring our previous findings in a gene expression study of ESCC. In the present study, we performed immunohistochemical validation of cornulin (CRNN) in a larger set of patients with ESCC. Downregulation of cornulin was observed in 89% (n=239) of 266 different ESCC tissues arrayed on tissue microarrays (TMAs). Expression of cornulin was observed in the prickle and functional cell layers of normal esophageal mucosa, localized predominantly in the cytoplasm and perinuclear region. The large majority of ESCC cases had little or no expression of cornulin in the carcinoma or stroma. These findings suggest that cornulin is an important molecule in normal esophageal pathology and is likely lost during the conversion of normal to neoplastic epithelium.

Item Type: Article
Uncontrolled Keywords: Mass Spectrometry squamous epithelial ; induced stress protein of 53 kDa; c1Orf10; Epidermal differentiation complex ; S100 gene family ; Stress response protein ; Loss of heterozygosity.
Subjects: Research > Research Center - Health Sciences
Depositing User: KMC Manipal
Date Deposited: 14 Feb 2015 04:52
Last Modified: 14 Feb 2015 04:52

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