iTRVZ: liquid nano-platform for signal integration on the plasma membrane
Tsunoyama, T. A.; Hoffmann, C.; Tang, B.; Hirosawa, K. M.; Nemoto, Y. L.; Kasai, R. S.; Fujiwara, T.; Suzuki, K. G.; Milovanovic, D.; Kusumi, A.
Show abstract
Cell survival in immune-competent organisms relies on both growth and immune evasion, yet these processes have been studied as independent cellular programs. Here, using super-resolution single-molecule imaging, we identify GEM (Growth and Evasion Metastable hub), a {approx}34-nm, metastable, nano-liquid, plasma membrane hub that physically integrates receptor-type tyrosine kinase (RTK) inputs with CD59-mediated immune-evasion signaling within the same assembly. GEM is formed by LLPS-like protein clustering on PI(4,5)P2-containing raft-nanodomains. Upon concurrent RTK and CD59 stimulations, GEM recruits both receptors and downstream kinases, enabling reciprocal activation via nano-liquid confinement that supralinearly amplifies PLC{gamma}-IP3-Ca2+ and PI3K-Akt survival signaling outputs. In mice, disrupting GEM suppresses tumor growth in vivo, establishing nano-liquid GEM as an integrator that physically couples growth and CD59-mediated immune-evasion signaling for cell survival.
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