Abstract
Phospholipase C-γ1(PLC-γ1) is known to play an essential role in various cellular responses, such as proliferation and tumorigenesis, and PLC-γ1-specific inhibitors are commonly employed to investigate the mechanism of the PLC-γ1-mediated signaling pathway. In this study, we developed a single chain antibody fragment (scFv) as a blocker for PLC-γ1 mediated signaling. scFv, designated F7-scFv, specifically bound to PLC-γ1 with high affinity (Kd=1.9×10−8 M) in vitro. F7-scFv also bound to PLC-γ1 in vivo and altered the distribution pattern of PLC-γ1 from the cytoplasm to the intracellular aggregates, where F7-scFv was localized. Moreover, F7-scFv interrupted the EGF-induced translocation of PLC-γ1 from the cytosol to the membrane ruffle and attenuated EGF-induced inositol phosphates generation and intracellular calcium mobilization. These results indicate that F7-scFv blocks EGF-induced PLC-γ1 activation by causing sequestering of PLC-γ1 into intracellular aggregates, and may therefore be useful in studies of the PLC-γ1-mediated signaling pathway.
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Acknowledgements
This work was supported by financial support from the Korean Ministry of Education made in the program years of 1997, 21C Frontier Functional Human Genome Project from the Ministry of Science & Technology of Korea, and Critical Technology 21 on ‘Life Phenomena and Function Research’ from the Ministry of Science & Technology of Korea. Lucio Cocco is supported by AIRC, CNR PFBiotec. and FST of Bologna University.
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Yi, K., Chung, J., Lee, Y. et al. Inhibition of the EGF-induced activation of phospholipase C-γ1 by a single chain antibody fragment. Oncogene 20, 7954–7964 (2001). https://doi.org/10.1038/sj.onc.1204959
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DOI: https://doi.org/10.1038/sj.onc.1204959