title: Identification of genes potentially involved in supporting hematopoietic stem cell activity of stromal cell line MC3T3-G2/PA6.
abstract: Although coculture of hematopoietic stem cells (HSCs) with stromal cells is a useful system to study hematopoiesis in the niche, little is known regarding the precise cellular and molecular mechanisms of maintaining HSCs through cell-cell interactions. The murine preadipose stromal cell line MC3T3-G2/PA6 (PA6) has been demonstrated to support HSCs in vitro. In this study, microarray analysis was performed on PA6 cells and HSC-nonsupporting PA6 subclone cells to identify genes responsible for supporting HSC activity. Comparison of gene expression profiles revealed that only 144 genes were down-regulated by more than twofold in PA6 subclone cells. Of these down-regulated genes, we selected 11 candidate genes and evaluated for the maintenance of HSC function by overexpressing these genes in PA6 subclone cells. One unknown gene, 1110007F12Rik (also named as Tmem140), which is predicted to encode an integral membrane protein, demonstrated a partial restoration of the defect in HSC-supporting activity.
authors.affiliation: Subteam for Manipulation of Cell Fate, RIKEN BioResource Center, 3-1-1 Koyadai, Tsukuba, Ibaraki, 305-0074, Japan.
authors.forename: Natsumi
authors.initials: N
authors.lastname: Shimizu
authors.forename: Shinichi
authors.initials: S
authors.lastname: Noda
authors.forename: Kazufumi
authors.initials: K
authors.lastname: Katayama
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Ichikawa
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kodama
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Miyoshi
mesh_terms: D000818:Animals; D018920:Coculture Techniques; D020869:Gene Expression Profiling; D006410:Hematopoiesis / Q000502:physiology*; D006412:Hematopoietic Stem Cells / Q000502:physiology*; D051379:Mice; D020411:Oligonucleotide Array Sequence Analysis; D017154:Stromal Cells / Q000502:physiology*