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Importantly, ligating the B-cell integrin, LFA-1, with ICAM-1 promotes IS formation when antigen is limiting. Whether the actin cytoskeleton plays a specific role in integrin-dependent IS formation is unknown. Here, we show using super-resolution imaging of mouse primary B cells that LFA-1:ICAM-1 interactions promote the formation of an actomyosin network that dominates the B-cell IS. This network is created by the formin mDia1, organized into concentric, contractile arcs by myosin 2A, and flows inward at the same rate as B-cell receptor (BCR):antigen clusters. Consistently, individual BCR microclusters are swept inward by individual actomyosin arcs. Under conditions where integrin is required for synapse formation, inhibiting myosin impairs synapse formation, as evidenced by reduced antigen centralization, diminished BCR signaling, and defective signaling protein distribution at the synapse. Together, these results argue that a contractile actomyosin arc network plays a key role in the mechanism by which LFA-1 co-stimulation promotes B-cell activation and IS formation.<\/jats:p>","DOI":"10.7554\/elife.72805","type":"journal-article","created":{"date-parts":[[2022,4,11]],"date-time":"2022-04-11T10:00:35Z","timestamp":1649671235000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.72805","source":"Crossref","is-referenced-by-count":35,"title":["A B-cell actomyosin arc network couples integrin co-stimulation to mechanical force-dependent immune synapse formation"],"prefix":"10.7554","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8666-4662","authenticated-orcid":true,"given":"Jia C","family":"Wang","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01cwqze88","id-type":"ROR","asserted-by":"publisher"}],"name":"Cell and Developmental Biology Center, National Heart, Lung and Blood Institute, National Institutes of Health","place":["Bethesda, 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