title: Stem cell gene expression in MRPS18-2-immortalized rat embryonic fibroblasts.
abstract: We have recently found that primary rat embryonic fibroblasts (REFs) could be immortalized by overexpression of the human mitochondrial ribosomal protein MRPS18-2 (S18-2). A derived cell line, designated 18IM, expressed the embryonic stem cell markers SSEA-1 and Sox2. Upon inoculation into severe combined immunodeficiency mice, 18IM cells differentiated to express pan-keratin. They were not tumorigenic. Here we report the gene profiling of 18IM, compared with REF cells. Pathways involved in oxidative phosphorylation, ubiquinone (Coenzyme Q 10) biosynthesis, fatty acid elongation in mitochondria, PI3K/AKT signaling, a characteristic of rapidly proliferating cells, were upregulated in 18IM. Genes involved in the transcription/translation machinery and redox reactions, like elongation factors, ATP synthases, NADH dehydrogenases, mitogen activated kinases were upregulated as well. 18IM cells produced more pyruvate, indicating enhanced ATP synthesis. The expression of Oct4, Sox2, and Nanog that can contribute to the experimental induction of pluripotency in primary fibroblasts was also elevated, in contrast to Klf4 and C-myc that were downregulated. Subsequently, three new immortalized cell lines were produced by S18-2 overexpression in order to check the representativeness of 18IM. All of them showed anchorage-independent growth pattern. Two of three clones lost vimentin and smooth muscle actin, and expressed Sox2 and Oct4. We suggest that S18-2 is involved in the developmental regulation.
authors.affiliation: Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden.
authors.forename: S P
authors.initials: SP
authors.lastname: Yenamandra
authors.forename: S D
authors.initials: SD
authors.lastname: Darekar
authors.forename: V
authors.initials: V
authors.lastname: Kashuba
authors.forename: L
authors.initials: L
authors.lastname: Matskova
authors.forename: G
authors.initials: G
authors.lastname: Klein
authors.forename: E
authors.initials: E
authors.lastname: Kashuba
mesh_terms: D000818:Animals; D002454:Cell Differentiation; D002461:Cell Line, Transformed; D049109:Cell Proliferation; D053595:Embryonic Stem Cells / Q000166:cytology / Q000378:metabolism*; D005347:Fibroblasts / Q000166:cytology / Q000378:metabolism*; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D006801:Humans; D007633:Keratins / Q000096:biosynthesis; D000090062:Kruppel-Like Factor 4; D016256:Lewis X Antigen / Q000235:genetics / Q000378:metabolism; D051379:Mice; D016513:Mice, SCID; D000071317:Nanog Homeobox Protein; D050814:Octamer Transcription Factor-3 / Q000235:genetics / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis; D010957:Plasmids; D051381:Rats; D012269:Ribosomal Proteins / Q000235:genetics* / Q000378:metabolism; D055748:SOXB1 Transcription Factors / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism; D014162:Transfection; D014183:Transplantation, Heterologous
chemical_list: C000715467:KLF4 protein, human; C000715468:Klf4 protein, mouse; C000715469:Klf4 protein, rat; D000090062:Kruppel-Like Factor 4; D016256:Lewis X Antigen; D000071317:Nanog Homeobox Protein; C547030:Nanog protein, rat; D050814:Octamer Transcription Factor-3; D012269:Ribosomal Proteins; D055748:SOXB1 Transcription Factors; C527784:Sox2 protein, rat; D014157:Transcription Factors; D007633:Keratins