title: Expression of MRP14 gene is frequently down-regulated in Chinese human esophageal cancer.
abstract: Migration inhibitory factor-related protein 14 (MRP14) is one of calcium-binding proteins, referred as S100A9. The heterodimeric molecule formed by MRP14 with its partner MRP8 (S100A8) is the major fatty acid carrier in neutrophils. The MRP8/14 complex has been also implicated in the intracellular transport of arachidonic acid and its precursors in keratinocytes. We show here the involvement of MRP14 in human esophageal cancer. In an initial study, mRNA differential display-reverse transcription polymerase chain reaction (DD-PCR) was performed with two esophageal carcinomas, one esophageal adenocarcinoma and matched normal adjacent mucosa. DD-PCR with the arbitrary primer OPA3 showed that one cDNA band was highly expressed in normal tissues, but disappeared or substantially decreased in tumor counterparts. It was later identified to be the 3'-end of migration inhibitory factor-related protein 14 (MRP14). Northern blotting, RT-PCR and Western blotting corroborated the down-regulation of MRP14 in 58/64 squamous cell carcinomas and 2/2 adenocarcinomas as compared with adjacent normal epithelia of the esophagus. MRP14 was undetectable in 3/3 esophageal-carcinoma cell lines. Immunochemistry demonstrated that expression of MRP14 was restricted to normal esophageal epithelia. No mutation was found in the genomic DNA of the MRP14 gene by PCR and directed DNA sequencing. Our finding suggested that the reduction of MRP14 expression is a frequent event in Chinese human esophageal cancer.
authors.affiliation: National Laboratory of Molecular Oncology, Cancer Institute (Hospital), Chinese Academy of Medical Sciences, Peking University of Medical School, Beijing 100021, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Wang
authors.forename: Yan
authors.initials: Y
authors.lastname: Cai
authors.forename: Hao
authors.initials: H
authors.lastname: Xu
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Xin
authors.initials: X
authors.lastname: Xu
authors.forename: Ya Ling
authors.initials: YL
authors.lastname: Han
authors.forename: Zhi Xiong
authors.initials: ZX
authors.lastname: Xu
authors.forename: Bao Sheng
authors.initials: BS
authors.lastname: Chen
authors.forename: Hai
authors.initials: H
authors.lastname: Hu
authors.forename: Min
authors.initials: M
authors.lastname: Wu
authors.forename: Ming Rong
authors.initials: MR
authors.lastname: Wang
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism; D000230:Adenocarcinoma / Q000453:epidemiology / Q000235:genetics / Q000473:pathology; D000328:Adult; D000368:Aged; D015152:Blotting, Northern; D015153:Blotting, Western; D040502:Calgranulin B / Q000235:genetics* / Q000378:metabolism; D002294:Carcinoma, Squamous Cell / Q000453:epidemiology / Q000235:genetics / Q000473:pathology; D045744:Cell Line, Tumor; D002467:Cell Nucleus / Q000737:chemistry; D002681:China / Q000453:epidemiology; D004252:DNA Mutational Analysis; D018076:DNA, Complementary / Q000235:genetics; D015536:Down-Regulation / Q000235:genetics; D004848:Epithelium / Q000737:chemistry; D004938:Esophageal Neoplasms / Q000453:epidemiology / Q000235:genetics* / Q000473:pathology; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D012334:RNA, Neoplasm / Q000235:genetics / Q000302:isolation & purification; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: C435500:ABCC11 protein, human; D018528:ATP-Binding Cassette Transporters; D040502:Calgranulin B; D018076:DNA, Complementary; D012334:RNA, Neoplasm