title: Elevated maspin expression is associated with better overall survival in esophageal squamous cell carcinoma (ESCC).
abstract: Tumor suppressor maspin is a differentially regulated gene in the progression of many types of cancer. While the biological function of maspin in blocking tumor invasion and metastasis is consistent with the loss of maspin expression at the late stage of tumor progression, the differential expression and the biological significance of maspin in early stage of tumor progression appear to be complex and remain to be elucidated. In the current study, we examined the expression of maspin in 84 esophageal squamous cell carcinoma (ESCC) cases (stages I-III) and 55 non-tumor adjacent esophageal tissue specimens by immunohistochemical (IHC) staining. The correlation of maspin with clinicopathological parameters was analyzed. Compared to normal esophageal squamous tissue where 80% (47/55) of the cases expressed maspin at a low to moderate level, all ESCC specimens (100% (84/84)) were positive for maspin expression at a moderate to high level. ESCC with low or moderate maspin expression had significantly shorter postoperative survival rates compared to those that had high maspin expression (p<0.001). Since the correlation of maspin with ESCC histology and the correlation of maspin with ESCC prognosis seem to be at odds, we further investigated the biological function of maspin in ESCC using the established ESCC cell lines. The expression of maspin in five human esophageal squamous cancer cell lines (T12, E450, KYSE150, EC109, and KYSE510) was examined by the Western blot. ESCC cell line KYSE510 that did not express maspin and was stably transfected by maspin cDNA or an empty vector. The resulting transfected cells were characterized in vitro. Maspin expression significantly inhibited cell proliferation, motility and matrigel invasion. Taken together, our data suggest that the transient up-regulation of maspin in the early development of ESCC may be a defense mechanism against further transition towards more malignant phenotypes, ultimately slowing down ESCC tumor progression.
authors.affiliation: Thoracic Surgery, Key Laboratory of Carcinogenesis and Translational Research Ministry of Education, Peking University School of Oncology, Beijing Cancer Hospital & Institute, Beijing, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Shijie
authors.initials: S
authors.lastname: Sheng
authors.forename: Jianzhi
authors.initials: J
authors.lastname: Zhang
authors.forename: Sijana
authors.initials: S
authors.lastname: Dzinic
authors.forename: Shaolei
authors.initials: S
authors.lastname: Li
authors.forename: Fang
authors.initials: F
authors.lastname: Fang
authors.forename: Nan
authors.initials: N
authors.lastname: Wu
authors.forename: Qingfeng
authors.initials: Q
authors.lastname: Zheng
authors.forename: Yue
authors.initials: Y
authors.lastname: Yang
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000401:mortality* / Q000473:pathology; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000235:genetics; D049109:Cell Proliferation; D003094:Collagen / Q000235:genetics; D004338:Drug Combinations; D004938:Esophageal Neoplasms / Q000235:genetics* / Q000401:mortality* / Q000473:pathology; D000077277:Esophageal Squamous Cell Carcinoma; D004947:Esophagus / Q000473:pathology; D005260:Female; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D016147:Genes, Tumor Suppressor; D006801:Humans; D007797:Laminin / Q000235:genetics; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness / Q000235:genetics / Q000473:pathology; D011379:Prognosis; D011509:Proteoglycans / Q000235:genetics; D015843:Serpins / Q000235:genetics*; D015854:Up-Regulation / Q000235:genetics
chemical_list: D004338:Drug Combinations; D007797:Laminin; D011509:Proteoglycans; C085344:SERPIN-B5; D015843:Serpins; C059485:matrigel; D003094:Collagen