Abstract
Cord blood transplantation (CBT) with units containing total nucleated cell (TNC) dose >2.5 × 107/kg is associated with improved engraftment and decreased transplant-related mortality. For many adults no single cord blood units are available that meet the cell dose requirements. We developed a dog model of CBT to evaluate approaches to overcome the problem of low cell dose cord blood units. This study primarily compared double- versus single-unit CBT. Unrelated dogs were bred and cord blood units were harvested. We identified unrelated recipients that were dog leukocyte antigen (DLA)-88 (class I) and DLA-DRB1 (class II) allele-matched with cryopreserved units. Each unit contained ≤1.7 × 107 TNC/kg. Recipients were given 9.2 Gy total-body irradiation (TBI) and DLA-matched unrelated cord blood with postgrafting cyclosporine and mycophenolate mofetil. After double-unit CBT, 5 dogs engrafted and 4 survived long term with 1 dominant engrafting unit and prompt immune reconstitution. In contrast, 0 of 5 dogs given single-unit CBT survived beyond 105 days (P = .03, log-rank test); neutrophil and platelet recovery was delayed (both P = .005) and recipients developed fatal infections. This new large animal model showed that outcomes were improved after double-unit compared to single-unit CBT. After double-unit CBT, the nonengrafted unit facilitates engraftment of the dominant unit.
Original language | English (US) |
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Pages (from-to) | 1090-1098 |
Number of pages | 9 |
Journal | Biology of Blood and Marrow Transplantation |
Volume | 16 |
Issue number | 8 |
DOIs | |
State | Published - Aug 2010 |
Funding
Financial disclosure: The authors gratefully acknowledge the Veterinary supervision of Michele Spector, DVM, and all of the skilled animal technicians who provided surgical and medical care for the dogs, with special thanks to Marcia Hogan, Ausra Vastakas, Erin Hughes, Jennifer Gourley, and Jaime Newberry. We thank Chen-Han Lin, Patrice Stroup, David Yadock, Debe Higginbotham, Alla Nikitine, Billie Hwang, and Kraig Abrams for their technical assistance. We thank the physicians and postdoctoral investigators who volunteered and participated in weekend and after-hour care of the dogs including: Marco Mielcarek, David W. Mathes, Marcello Rotta, Maura Parker, Zejing Wang, Monica Thakar, Boglarka Gyurkocza, Mohammed Sorror, Yasuhiro Suzuki, Zhen Yan, Xiaobing Zhang, Hirohisa Nakamae, Won Sik Lee, Hans-Peter Kiem, Joerg Enssle, Jaakko V. Parkkinen, and Brian Beard. We also thank Bonnie Larson, Helen Crawford, and Sue Carbonneau for help with manuscript preparation. We thank Dr. Beverly Torok-Storb for her review of the manuscript. Amgen kindly provided recombinant canine G-CSF. Funding was provided from the National Institutes of Health, National Institute for Allergy and Infectious Disease , Grant U19 AI 067770 , Centers for Medical Countermeasures against Radiation. Additional support was provided by NIH Grants CA15704, CA78902 , and DK42716 .
Keywords
- Cord blood transplantation
- Dog model
- Graft failure
- Immune reconstitution
- Unrelated donor
ASJC Scopus subject areas
- Transplantation
- Hematology