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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Transplant
2014 ; 14
(12
): 2691-703
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Superiority of rapamycin over tacrolimus in preserving nonhuman primate Treg
half-life and phenotype after adoptive transfer
#MMPMID25359003
Singh K
; Stempora L
; Harvey RD
; Kirk AD
; Larsen CP
; Blazar BR
; Kean LS
Am J Transplant
2014[Dec]; 14
(12
): 2691-703
PMID25359003
show ga
Many critical issues remain concerning how best to deploy adoptive regulatory T
cell (Treg) immunotherapy to the clinic. These include a determination of their
pharmacokinetic characteristics, their optimal dose, their phenotypic stability
and the best therapies with which to pair Tregs. By performing a CFSE-labeled
autologous Treg pulse experiment, we determined that the accessible peripheral
blood Treg pool in rhesus macaques is quite large (75?±?11?×?10(6)?Tregs/kg).
Pharmacokinetic analysis revealed that Tregs have two phases of elimination: an ?
phase, with a T1/2 in the peripheral blood of 32.4?±?11.3?h and a ? phase with a
T1/2 of 120.4?±?19.7?h. In addition to their short initial half-life, Tregs
underwent rapid phenotypic shifts after infusion, with significant loss of both
CD25 and FoxP3 by day +6. While tacrolimus stabilized CD25 expression, it did not
improve T1/2 , nor mitigate the loss of FoxP3. In contrast, rapamycin
significantly stabilized both CD25 and FoxP3, and supported an increased
half-life, with an ? phase of 67.7?±?6.9?h and a ? phase of 252.1?±?54.9?h. These
results suggest that rapamycin may be a necessary addition to Treg immunotherapy,
and that tacrolimus may be deleterious to Treg integrity posttransfer.