title: Human Mesenchymal Stem Cells Display Reduced Expression of CD105 after Culture in Serum-Free Medium.
abstract: Human Mesenchymal Stem Cells (hMSCs) present a promising tool for regenerative medicine. However, ex vivo expansion is necessary to obtain sufficient cells for clinical therapy. Conventional growth media usually contain the critical component fetal bovine serum. For clinical use, chemically defined media will be required. In this study, the capability of two commercial, chemically defined, serum-free hMSC growth media (MSCGM-CD and PowerStem) for hMSC proliferation was examined and compared to serum-containing medium (MSCGM). Immunophenotyping of hMSCs was performed using flow cytometry, and they were tested for their ability to differentiate into a variety of cell types. Although the morphology of hMSCs cultured in the different media differed, immunophenotyping displayed similar marker patterns (high expression of CD29, CD44, CD73, and CD90 cell surface markers and absence of CD45). Interestingly, the expression of CD105 was significantly lower for hMSCs cultured in MSCGM-CD compared to MSCGM. Both groups maintained mesenchymal multilineage differentiation potential. In conclusion, the serum-free growth medium is suitable for hMSC culture and comparable to its serum-containing counterpart. As the expression of CD105 has been shown to positively influence hMSC cardiac regenerative potential, the impact of CD105 expression onto clinical use after expansion in MSCGM-CD will have to be tested.
authors.affiliation: Reference and Translation Center for Cardiac Stem Cell Therapy (RTC), University of Rostock, Schillingallee 68, 18057 Rostock, Germany.
authors.forename: Peter
authors.initials: P
authors.lastname: Mark
authors.forename: Mandy
authors.initials: M
authors.lastname: Kleinsorge
authors.forename: Ralf
authors.initials: R
authors.lastname: Gaebel
authors.forename: Cornelia A
authors.initials: CA
authors.lastname: Lux
authors.forename: Anita
authors.initials: A
authors.lastname: Toelk
authors.forename: Erik
authors.initials: E
authors.lastname: Pittermann
authors.forename: Robert
authors.initials: R
authors.lastname: David
authors.forename: Gustav
authors.initials: G
authors.lastname: Steinhoff
authors.forename: Nan
authors.initials: N
authors.lastname: Ma