title: Identification of appropriate reference genes for human mesenchymal cells during expansion and differentiation.
abstract: BACKGROUND
  Quantitative real time polymerase chain reaction (qPCR) is an extremely powerful technique for monitoring gene expression. The quantity of the messenger ribonucleic acids (mRNA) of interest should be normalized using a reference gene, in order to avoid unreliable results originated by the obtained RNA quality and quantity, manipulation errors and inhibitory contaminants. A reference gene is any gene that is stably and consistently expressed under the conditions being studied. Completely false data can be generated if a reference gene is not chosen adequately.
  
  
  RESULTS
  In the present study, we compared expression levels of five putative reference genes (HPRT1, ACTB, GAPDH, RPL13A and B2M) in primary cultures of four different human cells: mesenchymal stromal cells obtained from bone marrow, adipose tissue or umbilical cord Whartońs Jelly, and dermal fibroblasts, under different expansion and differentiation conditions. We observed that reference genes are not the same for different cells under the same culture conditions.
  
  
  CONCLUSIONS
  Most stable reference genes under our experimental conditions were: RPL13A for adipose tissue- and Whartońs Jelly-derived mesenchymal stromal cells, and HPRT1 for bone marrow-derived mesenchymal stromal cells and dermal fibroblasts. ACTB was the most unstable gene when evaluating adipose tissue- and Whartońs Jelly-derived mesenchymal stromal cells, whilst GAPDH and B2M were the most unstable genes for bone marrow-derived mesenchymal stromal cells and dermal fibroblasts, respectively.
authors.affiliation: Excellion Biomedical Services, Petrópolis, Rio de Janeiro, Brazil.
authors.forename: Paola Romina
authors.initials: PR
authors.lastname: Amable
authors.forename: Marcus Vinicius Telles
authors.initials: MV
authors.lastname: Teixeira
authors.forename: Rosana Bizon Vieira
authors.initials: RB
authors.lastname: Carias
authors.forename: José Mauro
authors.initials: JM
authors.lastname: Granjeiro
authors.forename: Radovan
authors.initials: R
authors.lastname: Borojevic
mesh_terms: D018929:Cell Culture Techniques; D002454:Cell Differentiation; D049109:Cell Proliferation; D006801:Humans; D008648:Mesoderm / Q000166:cytology* / Q000378:metabolism*; D016133:Polymerase Chain Reaction / Q000592:standards*; D012015:Reference Standards; D013223:Statistics as Topic
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