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2010 ; 40
(4
): 1022-35
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Uptake of apoptotic DC converts immature DC into tolerogenic DC that induce
differentiation of Foxp3+ Treg
#MMPMID20101618
Kushwah R
; Wu J
; Oliver JR
; Jiang G
; Zhang J
; Siminovitch KA
; Hu J
Eur J Immunol
2010[Apr]; 40
(4
): 1022-35
PMID20101618
show ga
DC apoptosis has been observed in patients with cancer and sepsis, and defects in
DC apoptosis have been implicated in the development of autoimmune diseases.
However, the mechanisms of how DC apoptosis affects immune responses, are
unclear. In this study, we showed that immature viable DC have the ability to
uptake apoptotic DC as well as necrotic DC without it being recognized as an
inflammatory event by immature viable DC. However, the specific uptake of
apoptotic DC converted immature viable DC into tolerogenic DC, which were
resistant to LPS-induced maturation. These tolerogenic DC secreted increased
levels of TGF-beta1, which induced differentiation of naïve T cells into Foxp3(+)
Treg. Furthermore, induction of Treg differentiation only occurred upon uptake of
apoptotic DC and not apoptotic splenocytes by viable DC, indicating that it is
specifically the uptake of apoptotic DC that gives viable immature DC the
potential to induce Foxp3(+) Treg. Taken together, these findings identify uptake
of apoptotic DC by viable immature DC as an immunologically tolerogenic event.