Abstract:
:Besides the liver, it has been difficult to identify which organ(s) and/or cellular component(s) contribute significantly to the production of human FVIII:c (FVIII). Thus far, only endothelial cells have been shown to constitute a robust extrahepatic source of FVIII, possibly explaining both the diverse presence of FVIII mRNA in the body, and the observed increase in FVIII levels during liver failure. Here, we investigate whether human mesenchymal stem cells (MSC), ubiquitously present in different organs, could also contribute to FVIII production. MSC isolated from human lung, liver, brain, and bone marrow expressed FVIII message as determined by quantitative-RT-PCR. Using an antibody specific for FVIII, confocal microscopy, and umbilical cord-derived endothelial cells (HUVEC) as a negative control, we demonstrated that, in MSC, FVIII protein was not stored in granules; rather, it localized to the perinuclear region. Furthermore, functional FVIII was detected in MSC supernatants and cell lysates by aPTT and chromogenic assays. These results demonstrate that MSC can contribute at low levels to the functional FVIII pool, and advance the understanding of the physiology of FVIII production and secretion.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Sanada C,Kuo CJ,Colletti EJ,Soland M,Mokhtari S,Knovich MA,Owen J,Zanjani ED,Porada CD,Almeida-Porada Gdoi
10.1002/jcp.24247subject
Has Abstractpub_date
2013-05-01 00:00:00pages
1010-6issue
5eissn
0021-9541issn
1097-4652journal_volume
228pub_type
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