Abstract
Solid tumors supply oxygen and nutrients required for angiogenesis by producing vascular endothelial growth factor (VEGF). Thus, inhibitors of VEGF signaling abrogate tumor angiogenesis, resulting in the suppression of tumor growth and metastasis. We here investigated the effects of tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) on VEGF-induced angiogenesis. TRAIL inhibited VEGF-induced in vitro angiogenesis of human umbilical vein endothelial cells (HUVECs) and in vivo neovascularization in chicken embryos and mice. TRAIL blocked VEGF-induced angiogenic signaling by inhibiting ERK, Src, FAK, paxillin, Akt, and eNOS. Further, TRAIL blocked intracellular Ca2+ elevation and actin reorganization in HUVECs stimulated with VEGF, without inhibiting VEGF receptor-2 tyrosine phosphorylation. TRAIL increased caspase-8 activity, without inducing caspase-9/-3 activation and apoptosis. Moreover, TRAIL resulted in cleavage of FAK into FAK-related non-kinase-like fragments in VEGF-stimulated HUVECs, which was blocked by a caspase-8 inhibitor and cellular caspase-8-like inhibitory protein. Biochemical and pharmacological inhibition of caspase-8 and FAK blocked the inhibitory effects of TRAIL on VEGF-stimulated anti-angiogenic signaling and events. In addition, caspase-8 knockdown also suppressed VEGF-mediated signaling and angiogenesis, suggesting that procaspase-8 plays a role of a non-apoptotic modulator in VEGF-induced angiogenic signaling. These results suggest that TRAIL inhibits VEGF-induced angiogenesis by increasing caspase-8 activity and subsequently decreasing non-apoptotic signaling functions of procaspase-8, without inducing caspase-3 activation and endothelial cell cytotoxicity. These data indicate that caspase-8 may be used as an anti-angiogenic drug for solid tumors resistant to TRAIL and anti-tumor drugs.
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Abbreviations
- TRAIL:
-
Tumor necrosis factor-related apoptosis inducing ligand
- VEGF:
-
Vascular endothelial growth factor
- HUVECs:
-
Human umbilical vein endothelial cells
- FRNK:
-
FAK-related non-kinase
- cFLIP:
-
Cellular FLICE-inhibitory protein
- DEVDase:
-
Caspase-3-like protease
- IETDase:
-
Caspase-8-like protease
- FBS:
-
Fetal bovine serum
- SDS-PAGE:
-
Sodium dodecyl sulfate-polyacrylamide gel electrophoresis
- bFGF:
-
Basic fibroblast growth factor
- CAM:
-
Chick chorioallantoic membrane
- eNOS:
-
Endothelial nitric oxide synthase
- NO:
-
Nitric oxide
- DAF-FM:
-
3-Amino-4-(N-methylamino)-2′,7′-difluorofluorescein
- PMSF:
-
Phenylmethylsulfonyl fluoride
- DED:
-
Death effector domain
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Acknowledgments
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF-2011-0028790). We thank Dr. Elaine Por for helpful comments and critical reading of this manuscript.
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The authors declare no conflict of interest.
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Hee-Jun Na and Jong-Yun Hwang have contributed equally to this study.
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Na, HJ., Hwang, JY., Lee, KS. et al. TRAIL negatively regulates VEGF-induced angiogenesis via caspase-8-mediated enzymatic and non-enzymatic functions. Angiogenesis 17, 179–194 (2014). https://doi.org/10.1007/s10456-013-9387-0
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DOI: https://doi.org/10.1007/s10456-013-9387-0