title: Reduced plasma APOA1 level is associated with gastric tumor growth in MKN45 mouse xenograft model.
abstract: There is no suitable diagnostic and prognostic biomarker for gastric cancer. The biggest hurdles in biomarker discovery are (i) the low abundance of cancer cell-specific proteins that limits their detection and (ii) complex inter-patient variations that complicate the discovery process. To circumvent these issues, we conducted proteomics on the plasma of gastric cancer mouse xenograft and attempted to identify proteins released by cancer cells. MKN45 gastric cancer cells were subcutaneously implanted into immune-incompetent nude mice. Plasma samples collected from mice with different tumor sizes (low, mid and high tumor loads) were subjected to iTRAQ and mass spectrometric analyses. Detection of human APOA1 in mouse plasma was verified and its expression level was shown to be lower in mice with large tumors compared to those with small tumors. Studies on a panel of about 14 gastric cancer cell lines supported the notion that APOA1 in mouse plasma was of human gastric cancer cell origin. While the clinical utility of APOA1 remains to be ascertained with a larger scale study, the current work supported the feasibility of using mouse xenograft model for gastric cancer biomarker discovery.
authors.affiliation: Cancer Science Institute of Singapore, National University of Singapore, Singapore. csicpk@nus.edu.sg
authors.forename: Poh-Kuan
authors.initials: PK
authors.lastname: Chong
authors.forename: Huiyin
authors.initials: H
authors.lastname: Lee
authors.forename: Jianbiao
authors.initials: J
authors.lastname: Zhou
authors.forename: Shaw-Cheng
authors.initials: SC
authors.lastname: Liu
authors.forename: Marie Chiew Shia
authors.initials: MC
authors.lastname: Loh
authors.forename: Jimmy Bok Yan
authors.initials: JB
authors.lastname: So
authors.forename: Khong Hee
authors.initials: KH
authors.lastname: Lim
authors.forename: Khay-Guan
authors.initials: KG
authors.lastname: Yeoh
authors.forename: Yoon-Pin
authors.initials: YP
authors.lastname: Lim
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D016632:Apolipoprotein A-I / Q000097:blood*; D014408:Biomarkers, Tumor / Q000097:blood*; D045744:Cell Line, Tumor; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D008969:Molecular Sequence Data; D009368:Neoplasm Transplantation; D040901:Proteomics / Q000379:methods; D016415:Sequence Alignment; D013274:Stomach Neoplasms / Q000235:genetics / Q000378:metabolism*; D023041:Xenograft Model Antitumor Assays
chemical_list: D016632:Apolipoprotein A-I; D014408:Biomarkers, Tumor