Abstract:
:The aim of the present study was to elucidate the impact of liver transplantation (LTX) on myeloid dendritic cell (MDC) homeostasis. We observed a threefold reduction of circulating CD1c(+) MDC immediately after LTX (n = 16; P < 0.01), and normalization between 3 and 12 months after LTX. This decline was not due to recruitment of MDC into the liver graft, as numbers of MDC in post-LTX liver graft biopsies were not increased compared to pre-LTX biopsies (n = 7). Moreover, no change in chemokine receptor expression on circulating MDC was observed, suggesting that their homing properties were not altered. Normalization of circulating MDC was associated with withdrawal of corticosteroid therapy, and not with changes in calcineurin inhibitor intake, indicating that corticosteroids are responsible for the observed changes in numbers of circulating MDC. During high-dose corticosteroid treatment early after LTX, circulating MDC showed a lowered maturation status with decreased expression of human leucocyte antigen D-related (HLA-DR) and CD86 compared to pre-LTX values (P < 0.01). However, when MDC from blood of LTX recipients were matured ex vivo, they up-regulated HLA-DR and co-stimulatory molecules to a comparable extent as MDC from healthy individuals. In addition, ex vivo matured MDC from both groups had equal allogeneic T cell stimulatory capacity. In conclusion, during the first months after LTX numbers and maturational status of circulating MDC are impaired significantly, probably due to a suppressive effect of corticosteroids on MDC. However, corticosteroid therapy does not imprint MDC with an intrinsic resistance to maturation stimuli.
journal_name
Clin Exp Immunoljournal_title
Clinical and experimental immunologyauthors
Bosma BM,Metselaar HJ,Tra WM,Mancham S,Kuipers EJ,Tilanus HW,Kwekkeboom Jdoi
10.1111/j.1365-2249.2007.03449.xsubject
Has Abstractpub_date
2007-09-01 00:00:00pages
525-34issue
3eissn
0009-9104issn
1365-2249pii
CEI3449journal_volume
149pub_type
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