Endothelial CD99 supports arrest of mouse neutrophils in venules and binds to neutrophil PILRs

被引:23
作者
Goswami, Debashree [1 ]
Maerz, Sigrid [1 ]
Li, Yu-Tung [1 ]
Artz, Annette [1 ]
Schaefer, Kerstin [1 ]
Seelige, Ruth [1 ]
Pacheco-Blanco, Mariana [1 ]
Jing, Ding [1 ]
Bixel, Maria Gabriele [1 ]
Araki, Masatake [2 ]
Araki, Kimi [2 ]
Yamamura, Ken-Ichi [2 ]
Vestweber, Dietmar [1 ]
机构
[1] Max Planck Inst Mol Biomed, Rontgenstr 20, D-48149 Munster, Germany
[2] Kumamoto Univ, Inst Resource Dev & Anal, Kumamoto, Japan
关键词
VE-CADHERIN; TRANSENDOTHELIAL MIGRATION; LEUKOCYTE EXTRAVASATION; CELLS; ALPHA; PTP; INFLAMMATION; RECOGNITION; ACTIVATION; RECEPTOR;
D O I
10.1182/blood-2016-08-733394
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
CD99 is a crucial regulator of the transmigration (diapedesis) of leukocytes through the blood vessel wall. Here, we report that CD99 acts at 2 different steps in the extravasation process. In agreement with previous antibody-blocking experiments, we found that CD99 gene inactivation caused neutrophil accumulation between venular endothelial cells and the basement membrane in the inflamed cremaster. Unexpectedly, we additionally found that leukocyte attachment to the luminal surface of the venular endothelium was impaired in the absence of CD99. Intravital video microscopy revealed that CD99 supported rapid chemokine-induced leukocyte arrest. Inhibition of leukocyte attachment and extravasation were both solely due to the absence of CD99 on endothelial cells, whereas CD99 on leukocytes was irrelevant. Therefore, we searched for heterophilic ligands of endothelial CD99 on neutrophils. We found that endothelial cells bind to the paired immunoglobulinlike receptors (PILRs) in a strictly CD99-dependent way. In addition, endothelial CD99 was coprecipitated with PILRs from neutrophils that adhered to endothelial cells. Furthermore, solubleCD99carrying a transferable biotin tag could transfer this tag covalently to PILRwhenincubated with intact neutrophils. Binding of neutrophils under flow to a surface coated with P-selectin fragment crystallizable (Fc) andintercellular adhesion molecule 1 (ICAM-1) Fc became more shear resistant if CD99 Fc was coimmobilized. This increased shear resistance was lost if neutrophils were preincubated with anti-PILR antibodies. We concluded that endothelial CD99 promotes leukocyte attachment to endothelium in inflamed vessels by a heterophilic ligand. In addition, CD99 binds to PILRs on neutrophils, an interaction that leads to increased shear resistance of the neutrophil attachment to ICAM-1.
引用
收藏
页码:1811 / 1822
页数:12
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