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Published on: July 10, 2019
Tick troponin I-like molecule is a potent inhibitor for angiogenesis
Shinya Fukumoto1, Takeshi Sakaguchi, Myungio You
1Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Japan.
Abstract:
This is the first report identifying the anti-angiogenesis saliva molecule of the ixodid tick. In our previous study, we identified a troponin I-like molecule (HLTnI) of the ixodid hard tick Haemaphysalis longicornis, a vector for various pathogens. To investigate its potential inhibitory effects for angiogenesis, we expressed and purified recombinant HLTnI in Escherichia coli. In a vascular endothelial growth factor (VEGF) competitive angiogenesis assay, the recombinant HLTnI significantly inhibited the capillary formation of human vascular endothelial cells (HUVEC) in vitro. The inhibition was dose-dependent with an IC(50) of 18.95 nM. These results indicated that HLTnI is a potent angiogenesis inhibitor.
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