title: Temporal HLA profiling and immunomodulatory effects of human adult bone marrow- and adipose-derived mesenchymal stem cells.
abstract: OBJECTIVE
  To investigate the temporal HLA expression profile and immunomodulatory function of mesenchymal stem cells (MSCs) during in vitro expansion.
  
  
  METHODS
  Adult bone marrow-derived MSCs (BMSCs) and adipose-derived MSCs (AMSCs) were cultured and HLA class I and II mRNA expression were investigated during serial expansion using semiquantitative reverse-transcription PCR. The immunomodulatory properties of MSCs were monitored using peripheral blood mononuclear cell (PBMC) proliferation and cytotoxicity assays.
  
  
  RESULTS
  Semiquantitative reverse-transcription PCR revealed that classical HLA class I molecules were highly expressed in MSCs and remained relatively stable during extended culture. Variable expression levels of HLA class II molecules were detected in both BMSCs and AMSCs across passages. AMSCs were more resistant to PBMC-mediated cytotoxicity and suppressed PBMC proliferation more than BMSCs, although the effect was diminished with increasing passage.
  
  
  CONCLUSIONS
  These findings provide insight regarding the relationship between MSC passage number and MSC immunosuppressive properties and suggest that AMSCs hold advantages over BMSCs for immunomodulatory therapeutic purposes.
authors.affiliation: Escape Therapeutics, Inc., San Jose, CA 95138, USA.
authors.forename: Bhamini
authors.initials: B
authors.lastname: Purandare
authors.forename: Takele
authors.initials: T
authors.lastname: Teklemariam
authors.forename: Longmei
authors.initials: L
authors.lastname: Zhao
authors.forename: Basil M
authors.initials: BM
authors.lastname: Hantash
mesh_terms: D000273:Adipose Tissue / Q000166:cytology*; D000328:Adult; D053687:Adult Stem Cells / Q000378:metabolism*; D015153:Blotting, Western; D001854:Bone Marrow Cells / Q000166:cytology*; D018929:Cell Culture Techniques; D004591:Electrophoresis, Polyacrylamide Gel; D020869:Gene Expression Profiling; D015395:Histocompatibility Antigens Class I / Q000378:metabolism*; D000949:Histocompatibility Antigens Class II / Q000378:metabolism*; D006801:Humans; D007155:Immunologic Factors / Q000378:metabolism; D059630:Mesenchymal Stem Cells / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D015395:Histocompatibility Antigens Class I; D000949:Histocompatibility Antigens Class II; D007155:Immunologic Factors