title: Clinical significance of mannose-binding lectin-associated serine protease-2 expression in esophageal squamous cell carcinoma.
abstract: Mannan-binding lectin-associated serine protease-2 (MASP-2) is a serine protease involved in the activation of lectin complement pathway. The differential expression of MASP-2 in human esophageal squamous cell carcinoma (ESCC) was recently reported from our laboratory using differential display. To determine the expression of MASP-2 protein, we raised a polyclonal antibody to human MASP-2 and used it for immunohistochemical analysis of MASP-2 in ESCCs. The antibody showed a single band of predicted molecular weight by western blotting. In normal human liver tissue, the cytoplasm was distinctly labeled by the antibody. Intriguingly, besides the cytoplasm, the nuclei of esophageal tumor cells were also labeled. To investigate the association of MASP-2 expression with esophageal tumorigenesis, its expression was analyzed in 51 primary ESCCs, 32 dysplasias, 21 histologically normal esophageal tissues and 6 adenocarcinomas by immunohistochemistry. Increased MASP-2 expression was observed in ESCCs (p = 0.001, Odd's ratio (OR) = 3.662) and in premalignant condition, dysplasia (p = 0.000, OR = 5.091) in comparison with the normal tissues. MASP-2 expression in ESCCs was associated with late clinical stage (p = 0.009, O.R. = 3.430) and nodal metastasis (p = 0.001, O.R. = 4.520). In conclusion, our antibody was demonstrated to be useful in recognizing MASP-2 expression on paraffin embedded tissue sections. To our knowledge, this is the first report showing MASP-2 expression in a solid tumor. MASP-2 expression in premalignant stage (dysplasia) as well as in ESCCs and its association with late clinical stage and nodal metastasis suggest that alteration in its expression is maintained during disease progression and is associated with aggressive tumor behavior.
authors.affiliation: Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi.
authors.forename: Amit
authors.initials: A
authors.lastname: Verma
authors.forename: Ajay
authors.initials: A
authors.lastname: Matta
authors.forename: Nootan Kumar
authors.initials: NK
authors.lastname: Shukla
authors.forename: Suryanarayana V S
authors.initials: SV
authors.lastname: Deo
authors.forename: Siddarth Datta
authors.initials: SD
authors.lastname: Gupta
authors.forename: Ranju
authors.initials: R
authors.lastname: Ralhan
mesh_terms: D000230:Adenocarcinoma / Q000201:enzymology; D014408:Biomarkers, Tumor / Q000032:analysis* / Q000235:genetics / Q000276:immunology; D015153:Blotting, Western; D002294:Carcinoma, Squamous Cell / Q000201:enzymology* / Q000473:pathology; D045744:Cell Line, Tumor; D004938:Esophageal Neoplasms / Q000201:enzymology* / Q000473:pathology; D004947:Esophagus / Q000201:enzymology; D015971:Gene Expression Regulation, Enzymologic; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D008207:Lymphatic Metastasis; D050606:Mannose-Binding Protein-Associated Serine Proteases / Q000032:analysis* / Q000235:genetics / Q000276:immunology; D016017:Odds Ratio; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D014408:Biomarkers, Tumor; D012333:RNA, Messenger; C105296:MASP2 protein, human; D050606:Mannose-Binding Protein-Associated Serine Proteases