title: Hepatic expression of the Sptlc3 subunit of serine palmitoyltransferase is associated with the development of hepatocellular carcinoma in a mouse model of nonalcoholic steatohepatitis.
abstract: The molecular mechanisms underlying the progression of nonalcoholic steatohepatitis (NASH) have not been fully elucidated. The aim of this study was to identify factors involved in NASH progression by analysis of pathophysiological features and gene-expression profiles in livers of STAM mice, a model of NASH-associated hepatocarcinogenesis. C57BL/6N (B6N) mice were injected with streptozotocin to generate STAM mice. Four-week-old male STAM and B6N mice were fed a high-fat diet (HFD) (STAM-F, B6N-F) or a conventional diet (STAM-C, B6N-C) until they were 10, 14, or 18 weeks old. Blood glucose and nonalcoholic fatty liver disease (NAFLD) activity scores of STAM-F were higher than those of STAM-C during all observation periods. STAM-F mice had more severe hepatic fibrosis at 14 weeks, and exhibited higher levels of α-fetoprotein-positive hepatic tumor formation with multiplication than STAM-C mice at 18 weeks. At 14 weeks, cDNA microarray analysis revealed that the hepatic expression of eight mRNAs was ≥30-fold higher in STAM-F than B6N-F mice. The expression of another four genes was increased ≥5-fold in STAM-F than B6N-F mice, and ≥5-fold in B6N-F relative to B6N-C mice. Of the 12 genes, the difference in Sptlc3 mRNA expression was most pronounced, and gradually increased over time, as determined by quantitative RT-PCR in STAM-F mice. In addition, Sptlc3 mRNA expression in STAM-F mice was higher than that in db/db mice that received HFD and in B6N mice fed a choline‑deficient L-amino acid (CDAA)-defined diet. In conclusion, a high-fat diet aggravated pathophysiological findings in the liver in NASH mouse models, and the hepatic expression of Sptlc3 mRNA was potentially associated with NASH progression.
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Yozo
authors.initials: Y
authors.lastname: Yoshimine
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Uto
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Kotaro
authors.initials: K
authors.lastname: Kumagai
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Seiichi
authors.initials: S
authors.lastname: Mawatari
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Shiho
authors.initials: S
authors.lastname: Arima
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Rie
authors.initials: R
authors.lastname: Ibusuki
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Kumiko
authors.initials: K
authors.lastname: Mera
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Nosaki
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Shuji
authors.initials: S
authors.lastname: Kanmura
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Masatsugu
authors.initials: M
authors.lastname: Numata
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Tamai
authors.affiliation: Department of HGF Tissue Repair and Regenerative Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Akihiro
authors.initials: A
authors.lastname: Moriuchi
authors.affiliation: Department of HGF Tissue Repair and Regenerative Medicine, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Hirohito
authors.initials: H
authors.lastname: Tsubouchi
authors.affiliation: Digestive and Lifestyle Diseases, Department of Human and Environmental Sciences, Kagoshima University Graduate School of Medical and Dental Sciences, Kagoshima, Japan.
authors.forename: Akio
authors.initials: A
authors.lastname: Ido
mesh_terms: D000410:Alanine Transaminase / Q000097:blood; D000818:Animals; D001219:Aspartate Aminotransferases / Q000097:blood; D002796:Choline Deficiency / Q000150:complications; D003043:Cocarcinogenesis; D003921:Diabetes Mellitus, Experimental / Q000150:complications / Q000201:enzymology / Q000235:genetics; D059305:Diet, High-Fat / Q000009:adverse effects; D018450:Disease Progression; D020869:Gene Expression Profiling; D006943:Hyperglycemia / Q000150:complications / Q000201:enzymology; D006946:Hyperinsulinism / Q000150:complications / Q000201:enzymology; D008099:Liver / Q000201:enzymology* / Q000473:pathology; D008103:Liver Cirrhosis / Q000201:enzymology / Q000209:etiology / Q000473:pathology; D008114:Liver Neoplasms, Experimental / Q000201:enzymology / Q000209:etiology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D065626:Non-alcoholic Fatty Liver Disease / Q000150:complications* / Q000201:enzymology / Q000473:pathology; D011230:Precancerous Conditions / Q000150:complications / Q000201:enzymology; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D054411:Receptors, Leptin / Q000172:deficiency; D051102:Serine C-Palmitoyltransferase / Q000096:biosynthesis* / Q000235:genetics; D013311:Streptozocin; D000509:alpha-Fetoproteins / Q000032:analysis
chemical_list: D012333:RNA, Messenger; D054411:Receptors, Leptin; D000509:alpha-Fetoproteins; C515447:leptin receptor, mouse; D013311:Streptozocin; C582181:SPTLC3 protein, mouse; D051102:Serine C-Palmitoyltransferase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase