抑制性突触后电位
免疫抑制
配体(生物化学)
免疫学
微泡
细胞生物学
医学
化学
癌症研究
生物
受体
神经科学
生物化学
小RNA
基因
作者
Xuewei Luo,Guicheng Du,Yufei Long,Mengchao ZHENG,Bingye Chen,Weiting LI,Guoliang Yan,Zhongquan Qi,Tianshu Lan
标识
DOI:10.1002/adhm.202300670
摘要
Programmed death ligand-1 (PD-L1) and donor antigens are critical for donor immature dendritic cells (DCs) targeting donor-specific T cells to induce transplant tolerance. This study aims to clarify whether DC-derived exosomes (DEX) with donor antigens (H2b) and high levels of PD-L1 expression (DEXPDL1+ ) can help to suppress graft rejection. In this study, it is demonstrated that DEXPDL1+ presents donor antigens, as well as PD-L1 co-inhibitory signals, directly or semi-directly via DCs to H2b-reactive T cells. This dual signal presentation can prolong the survival of heart grafts from B6 (H2b) mice but not from C3H (H2k) mice by inhibiting T cell activation, inducing activated T cell apoptosis, and modulating the balance of T cell differentiation from inflammatory to regulatory. Additionally, even though DEXPDL1+ treatment cannot induce tolerance after short-term treatment, this study provides a new vehicle for presenting co-inhibitory signals to donor-specific T cells. This novel strategy may facilitate the realization of donor-specific tolerance via the further optimization of drug-loading combinations and therapeutic regimens to elevate their killing ability.
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