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MedLine Citation:
PMID:  22943669     Owner:  NLM     Status:  Publisher    
The immunomodulatory properties of mesenchymal stromal cells are the subject of increasing interest and of widening clinical applications, but the reproducibility of their effects is controversial and the underlying mechanisms have not been fully clarified. We investigated the transfer of membrane vesicles, a recently recognized pathway of intercellular communication, as possible mediator of the interaction between mesenchymal stromal cells and B lymphocytes. Mesenchymal stromal cells exhibited a strong dose-dependent inhibition of B cell proliferation and differentiation in a CpG-stimulated peripheral blood mononuclear cell co-culture system. We observed that these effects could be fully reproduced by membrane vesicles isolated from mesenchymal stromal cell culture supernatants, in a dose-dependent fashion. Next, we evaluated the localization of fluorescent labeled membrane vesicles within specific cell subtypes both by flow cytometry and by confocal microscopy analysis. Membrane vesicles were found to be associated with stimulated B lymphocytes, but not with other cell phenotypes (T lymphocytes, dendritic cells, NK cells), in peripheral blood mononuclear cell culture. These results suggest that membrane vesicles derived from mesenchymal stromal cells are the conveyors of the immunosuppressive effect on B lymphocytes. These particles should be further evaluated as immunosuppressive agents in place of the parent cells, with possible advantages in term of standardization, safety and feasibility.
Manuela Budoni; Alessandra Fierabracci; Rosa Luciano; Stefania Petrini; Vincenzo Diciommo; Maurizio Muraca
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-27
Journal Detail:
Title:  Cell transplantation     Volume:  -     ISSN:  1555-3892     ISO Abbreviation:  Cell Transplant     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-9-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9208854     Medline TA:  Cell Transplant     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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