Abstract
Immunosurveillance requires the coordinated regulation of chemokines and adhesion molecules to guide immune cell migration. However, the critical molecule for governing the high trafficking capability of immune cells is not clear. Here we show that the effector molecule RAPL is indispensable in the integrin-mediated adhesion and migration of lymphocytes and dendritic cells. RAPL deficiency caused defective chemokine-triggered lymphocyte adhesion and migration to secondary lymphoid organs, resulting in atrophic lymphoid follicles and deficient marginal zone B cells, concomitant with increased immature B cells in the blood. Furthermore, splenic dendritic cells were diminished and defective in adhesion. After being activated with inflammatory stimuli, skin and splenic dendritic cells failed to migrate into either the draining lymph nodes or the white pulp of the spleen. Thus, RAPL is a crucial immune cell trafficking regulator essential for immunosurveillance.
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Acknowledgements
We thank A. Takashima (University of Texas, Dallas, Texas) for the XS52 cell line; Y. Fukui (Kyusyu University, Fukuoka, Japan) for discussions; and M. Imai and M. Hirata for technical assistance. Supported by the Ministry of Education, Sciences, Sports, and Cultures and Cell Science Research Foundation (16043224 and 14370112 to T.K. and 13140202 and 16390116 to K.I.).
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Supplementary information
Supplementary Fig. 1
Targeted disruption of the Rassf5 gene by homologous recombination. (PDF 916 kb)
Supplementary Fig. 2
Expression of LFA-1, CCR7, and CXCR4 in lymphocytes. (PDF 192 kb)
Supplementary Fig. 3
Adhesion and transmission of lymphocytes under shear flow. (PDF 164 kb)
Supplementary Video 1
Transmigration of lymphocytes infected with control adenovirus through endothelial monolayers without CCL21. (MOV 530 kb)
LN T cells from Balb/c mice transgenic for the adenovirus receptor were incubated with control adenovirus and cultured for 2 days before under-flow adhesion assays. Adenovirus-infected cells express GFP as a marker.
Time-lapse images of control adenovirus-infected lymphocytes were collected every 10 seconds, and the video was created at 10 frames/second using QuickTime Pro (Apple Computer Inc., Cupertino, CA).
Supplementary Video 2
Transmigration of lymphocytes infected with control adenovirus through endothelial monolayers with CCL21. (MOV 599 kb)
LN T cells from Balb/c mice transgenic for the adenovirus receptor were incubated with control adenovirus and cultured for 2 days before under-flow adhesion assays. Adenovirus-infected cells express GFP as a marker.
Time-lapse images of control adenovirus-infected lymphocytes stimulated with CCL21 were collected every 10 seconds, and the video was created at 10 frames/second using QuickTime Pro (Apple Computer Inc., Cupertino, CA).
Supplementary Video 3
Transmigration of lymphocytes infected with RAPL adenovirus through endothelial monolayers in the absence of CCL21 (MOV 764 kb)
LN T cells from Balb/c mice transgenic for the adenovirus receptor were incubated with RAPL-expressing adenovirus and cultured for 2 days before under-flow adhesion assays. Adenovirus-infected cells express GFP as a marker.
Time-lapse images of RAPL adenovirus-infected lymphocytes were collected every 10 seconds, and the video was created at 10 frames/second using QuickTime Pro (Apple Computer Inc., Cupertino, CA).
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Katagiri, K., Ohnishi, N., Kabashima, K. et al. Crucial functions of the Rap1 effector molecule RAPL in lymphocyte and dendritic cell trafficking. Nat Immunol 5, 1045–1051 (2004). https://doi.org/10.1038/ni1111
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DOI: https://doi.org/10.1038/ni1111
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