title: LPLUNC1 inhibits nasopharyngeal carcinoma cell growth via down-regulation of the MAP kinase and cyclin D1/E2F pathways.
abstract: Long-palate, lung and nasal epithelium clone 1 (LPLUNC1) gene expression is relatively tissue specific. It is highly expressed in nontumor nasopharyngeal epithelial tissues, but its expression is reduced in nasopharyngeal carcinoma (NPC), indicating that LPLUNC1 may be associated with the tumorigenesis of NPC. To study the effects of LPLUNC1 on NPC tumorigenesis, a full-length LPLUNC1 expression plasmid was stably transfected into the NPC cell line, 5-8F. Our data indicated that LPLUNC1 inhibited NPC cell proliferation in vitro and tumor formation in vivo. LPLUNC1 also delayed cell cycle progression from G1 to S phase and inhibited the expression of cyclin D1, cyclin-dependent kinase 4 (CDK4) and phosphorylated Rb. To further investigate the molecular mechanisms underlying the suppressive effects of LPLUNC1 on NPC tumorigenesis, cDNA microarray was performed. These studies revealed that LPLUNC1 inhibited the expression of certain mitogen-activated protein (MAP) kinases (MAPK) kinases and cell cycle-related molecules. Western blotting confirmed that the expression of MEK1, phosphorylated ERK1/2, phosphorylated JNK1/2, c-Myc and c-Jun were inhibited by LPLUNC1. Furthermore, the transcriptional activity of AP-1 was down-regulated by LPLUNC1, suggesting that the MAPK signaling pathway is regulated by LPLUNC1. Taken together, the present study indicates that LPLUNC1 delays NPC cell growth by inhibiting the MAPK and cyclin D1/E2F pathways and suggests that LPLUNC1 may represent a promising candidate tumor suppressor gene associated with NPC.
authors: Hunan Key Laboratory of Nonresolving Inflammation and Cancer, Disease Genome Research Center, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China.
authors: Yixin
authors: Y
authors: Yang
authors: Qianjin
authors: Q
authors: Liao
authors: Fang
authors: F
authors: Wei
authors: Xiaoling
authors: X
authors: Li
authors: Wenling
authors: W
authors: Zhang
authors: Songqing
authors: S
authors: Fan
authors: Lei
authors: L
authors: Shi
authors: Xiayu
authors: X
authors: Li
authors: Zhaojian
authors: Z
authors: Gong
authors: Jian
authors: J
authors: Ma
authors: Ming
authors: M
authors: Zhou
authors: Juanjuan
authors: J
authors: Xiang
authors: Shuping
authors: S
authors: Peng
authors: Bo
authors: B
authors: Xiang
authors: Hao
authors: H
authors: Deng
authors: Yunbo
authors: Y
authors: Yang
authors: Yong
authors: Y
authors: Li
authors: Wei
authors: W
authors: Xiong
authors: Zhaoyang
authors: Z
authors: Zeng
authors: Guiyuan
authors: G
authors: Li
mesh_terms: D000818:Animals; D001324:Autoantigens; D063646:Carcinogenesis / Q000378:metabolism; D002277:Carcinoma / Q000378:metabolism* / Q000473:pathology; D002453:Cell Cycle; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D019938:Cyclin D1 / Q000378:metabolism; D015536:Down-Regulation; D050684:E2F Transcription Factors / Q000378:metabolism; D050556:Fatty Acid-Binding Proteins; D015870:Gene Expression; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008070:Lipopolysaccharides / Q000494:pharmacology; D020935:MAP Kinase Signaling System; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D000077274:Nasopharyngeal Carcinoma; D009303:Nasopharyngeal Neoplasms / Q000378:metabolism* / Q000473:pathology; D009368:Neoplasm Transplantation; D011506:Proteins / Q000502:physiology*; D046888:Tissue Array Analysis
chemical_list: D001324:Autoantigens; C568077:BPIFB1 protein, human; D050684:E2F Transcription Factors; D050556:Fatty Acid-Binding Proteins; D008070:Lipopolysaccharides; D011506:Proteins; D019938:Cyclin D1
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