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 Blood, 1 March 2004, Vol. 103, No. 5, pp. 1941-1948.
Prepublished online as a Blood First Edition Paper on October 30, 2003; DOI 10.1182/blood-2003-05-1601.

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TRANSPLANTATION

Cotransplantation of third-party mesenchymal stromal cells can alleviate single-donor predominance and increase engraftment from double cord transplantation

Dong-Wook Kim, Yang-Jo Chung, Tai-Gyu Kim, Yoo-Li Kim, and Il-Hoan Oh

From the Cell and Gene Therapy Institute and the Department of Cellular Medicine and Biology, The Catholic University of Korea, Seoul; Catholic Stem Cell Transplantation Center, The Catholic University of Korea, Seoul; and the Department of Microbiology, The Catholic University of Korea, Seoul, Republic of Korea.

Although the infusion of umbilical cord blood (UCB) from multiple donors can be a strategy to overcome the cell dose limitation frequently encountered in UCB transplantation, clinical trials have revealed that cells from one donor dominate engraftment. To investigate the origin of and the factors influencing this inequality, we performed mixed transplantation of 2 UCB units with varying degrees of HLA disparities into NOD/SCID mice and determined donor origins by polymerase chain reaction–sequence-specific oligonucleotide probe (PCR-SSOP) or real-time quantitative (RQ)–PCR for human short tandem repeats (STRs). When total mononuclear cells from 2 units were transplanted as a mixture, cells from one donor predominated (ratio, 81:19), despite comparable overall engraftment when infused as single units, and no augmentation in overall engraftment was observed when compared with the single-unit controls. However, lineage depletion or cotransplantation of mesenchymal stromal cells (MSCs) expanded from third-party bone marrow resulted in more balanced coengraftment. Direct comparison of double UCB transplantation in the presence or absence of MSCs showed that the reduced deviation in the donor ratio (1.8:1 vs. 2.8:1) correlated with a higher overall level of engraftment with MSC cotransplantation. These results indicate that third-party MSCs can be used to alleviate donor deviation and to facilitate engraftment of multidonor UCB.


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