title: Characterization of a new small bowel adenocarcinoma cell line and screening of anti-cancer drug against small bowel adenocarcinoma.
abstract: Small bowel adenocarcinoma (SBA) is a rare, aggressive malignancy with a poor prognosis, and the mechanisms of carcinogenesis in SBA remain unclear. Our aims were to investigate the molecular mechanisms underlying SBA and to identify treatments by establishing and characterizing an SBA cell line and performing anti-cancer drug screening. SIAC1 cells, established from jejunal SBA, showed epithelial characteristics and formed organoids in 3D culture. SIAC1 cells had a heterozygous β-catenin deletion mutation, resulting in a stable β-catenin protein with enhanced Wnt/β-catenin activity. SIAC1 cells lacked MLH1 and MSH6 expression, and target genes such as TGFBR2 and ACVR2 showed frameshift mutations. Among 10 clinical SBA samples, 2 (20%) had interstitial deletions in β-catenin, expression of mismatch repair protein was aberrant in 4 (40%), and heterozygous frameshift mutations of three target genes were found in all 10 samples. On screening assay using 140 compounds, eribulin significantly inhibited SIAC1 cell growth both in vitro and in vivo by inhibition of the Wnt/β-catenin pathway via enhanced degradation of β-catenin. In conclusion, we established an SBA cell line with molecular characteristics similar to those of clinical SBA samples, including β-catenin deletion and mismatch repair protein deficiency, that will be useful for SBA research. Eribulin might be a candidate for SBA treatment due to its inhibitory effect on Wnt/β-catenin signaling.
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. Electronic address: suzuhiro817@yahoo.co.jp.
authors.forename: Hirobumi
authors.initials: H
authors.lastname: Suzuki
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. Electronic address: hiratay-int@h.u-tokyo.ac.jp.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Hirata
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Nobumi
authors.initials: N
authors.lastname: Suzuki
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Sozaburo
authors.initials: S
authors.lastname: Ihara
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Sakitani
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Yuka
authors.initials: Y
authors.lastname: Kobayashi
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Hiroto
authors.initials: H
authors.lastname: Kinoshita
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Yoku
authors.initials: Y
authors.lastname: Hayakawa
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Atsuo
authors.initials: A
authors.lastname: Yamada
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Watabe
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Tateishi
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Ikenoue
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Yamaji
authors.affiliation: Department of Gastroenterology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Koike
mesh_terms: D030301:Activin Receptors, Type II / Q000235:genetics / Q000378:metabolism; D000230:Adenocarcinoma / Q000188:drug therapy / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D000328:Adult; D000368:Aged; D045744:Cell Line, Tumor / Q000378:metabolism / Q000473:pathology; D004354:Drug Screening Assays, Antitumor; D005260:Female; D016368:Frameshift Mutation; D005663:Furans / Q000494:pharmacology*; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D049690:History, Ancient; D006801:Humans; D007414:Intestinal Neoplasms / Q000188:drug therapy / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D007659:Ketones / Q000494:pharmacology*; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000235:genetics / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism; D000077294:Receptor, Transforming Growth Factor-beta Type II; D018125:Receptors, Transforming Growth Factor beta / Q000235:genetics / Q000378:metabolism; D060449:Wnt Signaling Pathway / Q000187:drug effects / Q000235:genetics; D000095662:Polyether Polyketides
chemical_list: D030301:Activin Receptors, Type II; D005663:Furans; D007659:Ketones; D009363:Neoplasm Proteins; D017346:Protein Serine-Threonine Kinases; D000077294:Receptor, Transforming Growth Factor-beta Type II; D018125:Receptors, Transforming Growth Factor beta; C490954:eribulin; D000095662:Polyether Polyketides