Journal
JOURNAL OF CLINICAL INVESTIGATION
Volume 130, Issue 11, Pages 6064-6079Publisher
AMER SOC CLINICAL INVESTIGATION INC
DOI: 10.1172/JCI136457
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Funding
- Deutsche Forschungsgemeinschaft [SFB/TR 240, 374031971, NI 556/11-2]
- European Union (Thrombo-Inflame, EFRE-Europaischer Fonds fur regionale Entwicklung, Bavaria)
- German Excellence Initiative
- Ministerium fur Kultur und Wissenschaft des Landes Nordrhein-Westfalen
- Regierende Burgermeister von Berlin inkl. Wissenschaft und Forschung
- Bundesministerium fur Bildung und Forschung
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Store-operated Ca2+ entry (SOCE) is the major route of Ca2+ influx in platelets. The Ca2+ sensor stromal interaction molecule 1 (STIM1) triggers SOCE by forming punctate structures with the Ca2+ channel Orai1 and the inositol trisphosphate receptor (IP3R), thereby linking the endo-/sarcoplasmic reticulum to the plasma membrane. Here, we identified the BAR domain superfamily member bridging integrator 2 (BIN2) as an interaction partner of STIM1 and IP3R in platelets. Deletion of platelet BIN2 (Bin2(fl/fl,Pf4-Cre) mice) resulted in reduced Ca2+ store release and Ca2+ influx in response to all tested platelet agonists. These defects were a consequence of impaired IP3R function in combination with defective STIM1-mediated SOC channel activation, while Ca2+ store content and agonist-induced IP, production were unaltered. This severely defective Ca2+ signaling translated into impaired thrombus formation under flow and a protection of Bin2(fl/fl,Pf4-Cre) mice in models of arterial thrombosis and stroke. Our results establish BIN2 as a central regulator of platelet activation in thrombosis and thrombo-inflammatory disease settings.
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