JUNIPER PUBLISHERS-Open Access Blood Research & Transfusion Journal
Dendritic Cells and Regulatory T Cells Changes During ECP for Chronic GvHD in Pediatric Patients
Authored by Berger Massimo*
Graft-versus-host disease (GvHD) is a
leading cause of post HSCT morbidity and mortality. It is mediated by
alloreactive mature donor T lymphocytes, resulting in a harmful inflammatory
response and tissue injury . The pathophysiology of GvHD is constituted by
precise sequences of immunological events such as the activation of
antigen-presenting cells (APCs), activation, differentiation and migration of T
cells, and finally the development of their full effector functions. Dendritic
cells (DCs) constitute the most professional APCs, promoting alloreactivity or
clonal antigen-specific T cell responses. Moreover, tolerogenic DCs may play a
pivotal role in GvHD exerting an immunomodulatory or even immunosuppressive
effect on T cells. DCs can be divided into two major subsets, plasmacytoid DCs
(pDCs) and myeloid DCs (mDCs) which have distinct functions. pDCs play a
pivotal role in peripheral tolerance through the generation of regulatory T
(Treg). In addition to pDCs, mDCs also promote Th2 and Th0/Tr1 responses,
depending on the activation signal types.
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