ABSTRACT
This study used quantitative PCR in the murine model to compare the ability of a limb
allograft vs. a comparable dose of marrow suspension to induce chimerism. Female C57Bl/6
mice received a vascularized hindlimb allograft, a comparable dose of 5 × 106 donor bone marrow cells, or a standard dose (20 × 106) of marrow suspension from male Balb/c donors. All recipients were treated with a
regimen based on CD40 costimulation blockade and T cell depletion. Y chromosome-specific
quantitative PCR was used to measure chimerism. Most recipients of limb allografts
demonstrated low levels of chimerism after 1 week (3/4) and 1 month (3/4). Most recipients
of 5 × 106 marrow cells had low levels of chimerism at 1 week (4/6) and only 1/5 after 1 month.
All recipients of 20 × 106 cells except one demonstrated either low or high levels of chimerism after 1 week
(5/5) and 1 month (5/6). The marrow component of a limb allograft is thus more effective
at inducing microchimerism compared to a comparable dose of bone marrow suspension.
KEYWORDS
Limb transplantation - costimulation blockade - chimerism - quantitative PCR - bone
marrow transplantation
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Thomas H TungM.D.
Division of Plastic and Reconstructive Surgery, Washington University School of Medicine
660 S. Euclid Avenue, Suite 5401, St. Louis, MO 63110