Premium
Human mesenchymal stromal cells express CD14 cross‐reactive epitopes
Author(s) -
Pilz Gregor A.,
Braun Julian,
Ulrich Christine,
Felka Tino,
Warstat Katrin,
Ruh Manuel,
Schewe Bernhard,
Abele Harald,
Larbi Anis,
Aicher Wilhelm K.
Publication year - 2011
Publication title -
cytometry part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.316
H-Index - 90
eISSN - 1552-4930
pISSN - 1552-4922
DOI - 10.1002/cyto.a.21073
Subject(s) - cd90 , mesenchymal stem cell , biology , bone marrow , clone (java method) , epitope , stromal cell , antibody , microbiology and biotechnology , flow cytometry , cd14 , population , immunology , cd34 , stem cell , medicine , cancer research , environmental health , dna , genetics
Abstract Mesenchymal stromal cells (MSCs) do not express a unique definite epitope or marker gene. As such, minimal criteria were recently established for defining multipotent MSC. These criteria include expression of CD73, CD90, CD105, and a lack of hematopoietic marker expression. However, we detected binding of a CD14 antibody on bone marrow‐ and placenta‐derived MSC and investigated the staining of CD14 antibodies on these MSC in more detail. The MSC were isolated from human bone marrow and placenta tissue, expanded, characterized by quantitative RT‐PCR, flow cytometry, and immunocytochemistry and differentiated to generate osteoblasts, chondrocytes, and adipocytes. The CD14‐cross‐reactive MSCs were enriched by cell sorting. Human peripheral blood mononuclear cells, fibroblasts, and hematopoietic cell lines served as controls. Utilizing four different clones of CD14 monoclonal antibodies, we found that three CD14 reagents stained the MSC. Two CD14 antibodies (HCD14 and M5E2) clearly marked the CD90 + MSC population with distinct intensities, clone 134 620 generated a shift in flow cytometry histograms, but clone MΦP9 did not stain MSC. Transcripts encoding CD14 or the CD14 protein were not detected in MSC. We confirm that bone marrow‐ and placenta‐derived MSC do not express CD14 and that the CD14 antibody MΦP9 discriminates between monocytes and MSC more efficiently than the other antibodies employed here. This investigation does not contradict previous work but provides a more accurate characterization of MSC. © 2011 International Society for Advancement of Cytometry