Ethanol-induced small heat shock protein genes in the differentiation of mouse embryonic neural stem cells.
Neural stem cells (NSCs) of the neuroepithelium differentiate into one of three central nervous system (CNS) cell lineages: neurons, astrocytes, or oligodendrocytes. In this study, the differentiation potential of NSCs from the forebrain of embryonic day 15 (E15) mouse embryos was analyzed using immunocytochemistry. NSCs were differentiated early in the presence or absence of ethanol (50 mM), and gene expression patterns among NSCs, differentiated cells and ethanol-treated differentiated cells were assessed by microarray and real-time PCR analysis. Genes that were up-regulated in differentiated cells both in the presence and in the absence of ethanol when compared to NSCs were related to the Wnt signaling pathway, including Ctnna1, Wnt5a, Wnt5b, Wnt7a, Fzd3, and Fzd2; genes related to cell adhesion, including Cadm1, Ncam1, and Ncam2; and genes encoding small heat shock proteins, including HspB2, HspB7, and HspB8. In particular, the expression levels of HspB2 and HspB7 were elevated in ethanol-treated differentiated cells compared to non-treated differentiated cells. The gene expression patterns of various heat shock transcription factors (HSFs), proteins that regulate the transcription of heat shock genes, were also analyzed. The expression levels of HSF2 and HSF5 increased in differentiated cells in the presence and absence of ethanol when compared to NSCs. Of these two genes, HSF5 demonstrated an enhanced up-regulation, particularly in ethanol-treated differentiated cells compared to cells that were differentiated in the absence of ethanol. These results imply that HspB2 and HspB7, which are small heat shock proteins with tissue-restricted expression profiles, might be up-regulated by ethanol during the short-term differentiation of NSCs.
Choi
Mi Ran
MR
Division of Molecular and Life Sciences, Hanyang University, Ansan 426-791, Republic of Korea.
Jung
Kyoung Hwa
KH
Park
Ji Hyun
JH
Das
Nando Dulal
ND
Chung
Mi Kyung
MK
Choi
Ihn Geun
IG
Lee
Boung Chul
BC
Park
Kyoung Sun
KS
Chai
Young Gyu
YG
D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D053595:Embryonic Stem Cells / Q000187:drug effects* / Q000378:metabolism; D000431:Ethanol / Q000633:toxicity*; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D006360:Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D058953:Neural Stem Cells / Q000187:drug effects* / Q000378:metabolism; D015854:Up-Regulation / Q000187:drug effects
D006360:Heat-Shock Proteins; D000431:Ethanol