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2017 ; 4
(ä): 178-191
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Expansion of Human Tregs from Cryopreserved Umbilical Cord Blood for
GMP-Compliant Autologous Adoptive Cell Transfer Therapy
#MMPMID28345003
Seay HR
; Putnam AL
; Cserny J
; Posgai AL
; Rosenau EH
; Wingard JR
; Girard KF
; Kraus M
; Lares AP
; Brown HL
; Brown KS
; Balavage KT
; Peters LD
; Bushdorf AN
; Atkinson MA
; Bluestone JA
; Haller MJ
; Brusko TM
Mol Ther Methods Clin Dev
2017[Mar]; 4
(ä): 178-191
PMID28345003
show ga
Umbilical cord blood is a traditional and convenient source of cells for
hematopoietic stem cell transplantation. Thymic regulatory T cells (Tregs) are
also present in cord blood, and there is growing interest in the use of
autologous Tregs to provide a low-risk, fully human leukocyte antigen
(HLA)-matched cell product for treating autoimmune diseases, such as type 1
diabetes. Here, we describe a good manufacturing practice (GMP)-compatible Treg
expansion protocol using fluorescence-activated cell sorting, resulting in a mean
2,092-fold expansion of Tregs over a 16-day culture for a median yield of 1.26 ×
10(9) Tregs from single-donor cryopreserved units. The resulting Tregs passed
prior clinical trial release criteria for Treg purity and sterility, including
additional rigorous assessments of FOXP3 and Helios expression and epigenetic
analysis of the FOXP3 Treg-specific demethylated region (TSDR). Compared with
expanded adult peripheral blood Tregs, expanded cord blood Tregs remained more
naive, as assessed by continued expression of CD45RA, produced reduced IFN-?
following activation, and effectively inhibited responder T cell proliferation.
Immunosequencing of the T cell receptor revealed a remarkably diverse receptor
repertoire within cord blood Tregs that was maintained following in vitro
expansion. These data support the feasibility of generating GMP-compliant Tregs
from cord blood for adoptive cell transfer therapies and highlight potential
advantages in terms of safety, phenotypic stability, autoantigen specificity, and
tissue distribution.