Exploitation of herpesvirus immune evasion strategies to modify the immunogenicity of human mesenchymal stem cell transplants.
BACKGROUND
Mesenchymal stem cells (MSCs) are multipotent cells residing in the connective tissue of many organs and holding great potential for tissue repair. In culture, human MSCs (hMSCs) are capable of extensive proliferation without showing chromosomal aberrations. Large numbers of hMSCs can thus be acquired from small samples of easily obtainable tissues like fat and bone marrow. MSCs can contribute to regeneration indirectly by secretion of cytokines or directly by differentiation into specialized cell types. The latter mechanism requires their long-term acceptance by the recipient. Although MSCs do not elicit immune responses in vitro, animal studies have revealed that allogeneic and xenogeneic MSCs are rejected.


RESULTS
We aim to overcome MSC immune rejection through permanent down-regulation of major histocompatibility complex (MHC) class I proteins on the surface of these MHC class II-negative cells through the use of viral immune evasion proteins. Transduction of hMSCs with a retroviral vector encoding the human cytomegalovirus US11 protein resulted in strong inhibition of MHC class I surface expression. When transplanted into immunocompetent mice, persistence of the US11-expressing and HLA-ABC-negative hMSCs at levels resembling those found in immunodeficient (i.e., NOD/SCID) mice could be attained provided that recipients' natural killer (NK) cells were depleted prior to cell transplantation.


CONCLUSIONS
Our findings demonstrate the potential utility of herpesviral immunoevasins to prevent rejection of xenogeneic MSCs. The observation that down-regulation of MHC class I surface expression renders hMSCs vulnerable to NK cell recognition and cytolysis implies that multiple viral immune evasion proteins are likely required to make hMSCs non-immunogenic and thereby universally transplantable.
Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands.
Anabel S
AS
de la Garza-Rodea
Marieke C
MC
Verweij
Hester
H
Boersma
Ietje
I
van der Velde-van Dijke
Antoine A F
AA
de Vries
Rob C
RC
Hoeben
Dirk W
DW
van Bekkum
Emmanuel J H J
EJ
Wiertz
Shoshan
S
Knaän-Shanzer
D003602:Cytotoxicity, Immunologic; D006801:Humans; D057131:Immune Evasion; D007109:Immunity; D007694:Killer Cells, Natural / Q000276:immunology; D045164:Mesenchymal Stem Cell Transplantation / Q000379:methods*; D059630:Mesenchymal Stem Cells / Q000276:immunology*; D018139:Simplexvirus / Q000276:immunology
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