CC chemokine receptor 7-dependent and -independent pathways for lymphocyte homing: modulation by FTY720.

CC chemokine receptor 7-dependent and -independent pathways for lymphocyte homing: modulation by FTY720.
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DOI:
10.1084/jem.194.12.1875
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发表时间:
2001-12-17
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Förster R
Förster R
中科院分区:
其他
文献类型:
--
作者:
Henning G;Ohl L;Junt T;Reiterer P;Brinkmann V;Nakano H;Hohenberger W;Lipp M;Förster R

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淋巴细胞上的趋化因子受体CCR 7与其在高内皮微静脉(HEV)上表达的配体CCL 19和CCL 21的同源相互作用对于T和B细胞穿过HEV有效迁移到次级淋巴器官中是必不可少的。缺乏CCL 19和CCL 21-ser(HEV上CCR 7的两种配体)表达的Plt小鼠以及CCR 7缺陷小鼠具有缺陷的细胞迁移和减少的淋巴细胞归巢。FTY 720是一种新型的免疫抑制剂,可导致外周血和组织中淋巴细胞的减少,并将其隔离到淋巴组织中。在这项研究中,我们证明FTY 720挽救了CCR 7 −/−小鼠和plt小鼠的归巢缺陷。FTY 720治疗后,外周血中CD 4+和CD 8 + T细胞以及B细胞的数量减少,而百日咳毒素敏感性归巢到外周淋巴结、肠系膜淋巴结和派尔集合淋巴结的数量增加。免疫组织学证明FTY 720使这些细胞能够通过HEV进入淋巴组织。因此,我们的数据表明,淋巴细胞通过HEV归巢的另一种G-α i依赖性,CCR 7-CCL 19/CCL 21非依赖性机制,在FTY 720存在下强烈增强。
Cognate interaction of chemokine receptor CCR7 on lymphocytes with its ligands CCL19 and CCL21 expressed on high endothelial venules (HEVs) is essential for effective migration of T and B cells across HEVs into secondary lymphoid organs. Plt mice, which lack expression of CCL19 and CCL21-ser, both ligands for CCR7 on HEVs, as well as CCR7-deficient mice, have a defective cell migration and reduced homing of lymphocytes. FTY720, a novel immunosuppressant, causes a reduction of lymphocytes in peripheral blood and tissues and their sequestration into lymphoid tissues. In this study we demonstrate that FTY720 rescues the homing defect in both CCR7−/− mice and plt mice. After FTY720 treatment, the number of CD4+ and CD8+ T cells as well as B cells in peripheral blood is reduced while pertussis toxin–sensitive homing into peripheral lymph nodes, mesenteric lymph node, and Peyer's patches is increased. Immunohistology demonstrates that FTY720 enables these cells to enter lymphoid tissue through HEVs. Thus, our data suggest an alternative G-αi-dependent, CCR7-CCL19/CCL21-independent mechanism for lymphocyte homing through HEVs which is strongly augmented in the presence of FTY720.
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