title: Loss of periplakin expression is associated with the tumorigenesis of colorectal carcinoma.
abstract: Periplakin (PPL), a member of the plakin protein family, has been reported to be down-expressed in urothelial carcinoma. The role of PPL in human colorectal cancer, however, remains largely unknown. Also little is known about the contribution of PPL to the malignant property of colorectal cancer and the intracellular function of PPL. In this study, we demonstrated that PPL was apparently down-expressed in colon carcinomas compared with normal and para-carcinoma tissues, which was correlated with the tumor size. Enforced expression of PPL in HT29 cells inhibited its proliferation evidenced by decreased expression of phosphorylated ERK and PCNA. Furthermore, PPL overexpression could reduce metastasis and epithelial-mesenchymal transition (EMT) of HT29 cells, with decreased expression of N-cadherin, Snail, Slug and α-SMA while increased expression of E-cadherin. On the contrary, the PPL knockdown could promote the cell proliferation, migratory, invasive and EMT ability of HT29 cells. Moreover, enforced expression of PPL induced G1/G0 cell cycle arrest, with decreased cyclin D1, p-Rb and increased expression of p27kib, which could be reversed by PPL knockdown. In addition, PPL overexpression inhibited the growth of colon cancer allograft in vivo. Taken together, acted as a tumor suppressor in colon cancer progression, PPL could be a new biomarker or potential therapeutic target in colon cancer.
authors.affiliation: State Key Laboratory of Pharmaceutical Biotechnology, School of Life Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
authors.affiliation: State Key Laboratory of Pharmaceutical Biotechnology, School of Life Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China.
authors.forename: Guohui
authors.initials: G
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Pharmaceutical Biotechnology, School of Life Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Pharmaceutical Biotechnology, School of Life Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Elgehama
authors.affiliation: State Key Laboratory of Pharmaceutical Biotechnology, School of Life Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China.
authors.forename: Lele
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Oncology, The First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China. Electronic address: guluer@163.com.
authors.forename: Yanhong
authors.initials: Y
authors.lastname: Gu
authors.affiliation: State Key Laboratory of Pharmaceutical Biotechnology, School of Life Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China. Electronic address: guowj@nju.edu.cn.
authors.forename: Wenjie
authors.initials: W
authors.lastname: Guo
authors.affiliation: State Key Laboratory of Pharmaceutical Biotechnology, School of Life Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China. Electronic address: molpharm@163.com.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Xu
mesh_terms: D000199:Actins / Q000235:genetics; D000818:Animals; D015820:Cadherins / Q000235:genetics; D063646:Carcinogenesis / Q000235:genetics*; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000235:genetics; D049109:Cell Proliferation / Q000235:genetics; D003106:Colon / Q000473:pathology; D003110:Colonic Neoplasms / Q000235:genetics* / Q000473:pathology*; D015179:Colorectal Neoplasms / Q000235:genetics* / Q000473:pathology*; D018450:Disease Progression; D058750:Epithelial-Mesenchymal Transition / Q000235:genetics; D059585:G1 Phase Cell Cycle Checkpoints / Q000235:genetics; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D019073:HT29 Cells; D006801:Humans; D020935:MAP Kinase Signaling System / Q000235:genetics; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D051179:Plakins / Q000235:genetics*; D018809:Proliferating Cell Nuclear Antigen / Q000235:genetics; D016192:Resting Phase, Cell Cycle / Q000235:genetics; D000071250:Snail Family Transcription Factors / Q000235:genetics
chemical_list: C541116:ACTA2 protein, human; D000199:Actins; D015820:Cadherins; C491674:PPL protein, human; D051179:Plakins; D018809:Proliferating Cell Nuclear Antigen; C000604407:SNAI1 protein, human; D000071250:Snail Family Transcription Factors
keywords: Cell cycle; Colorectal carcinoma; Periplakin (PPL); Tumor suppressor; Tumorigenesis