Novel Action and Mechanism of Auranofin in Inhibition of Vascular Endothelial Growth Factor Receptor-3-Dependent Lymphangiogenesis

ISSN: 1875-5992 (Online)
ISSN: 1871-5206 (Print)


Volume 14, 10 Issues, 2014


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Anti-Cancer Agents in Medicinal Chemistry

Formerly: Current Medicinal Chemistry - Anti-Cancer Agents

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Editor-in-Chief:
Michelle Prudhomme
Universite Blaise Pascal - C.N.R.S
Aubiere Cedex
France


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Novel Action and Mechanism of Auranofin in Inhibition of Vascular Endothelial Growth Factor Receptor-3-Dependent Lymphangiogenesis

Author(s): Xiaodong Chen, Huanjiao Jenny Zhou, Qunhua Huang, Lin Lu and Wang Min

Affiliation: Interdepartmental Program in Vascular Biology and Therapeutics, Department of Pathology, Yale University School of Medicine, 10 Amistad St., New Haven, CT 06520.

Abstract

Auranofin is a gold compound initially developed for the treatment of rheumatoid arthritis. Recent data suggest that auranofin has promise in the treatment of other inflammatory and proliferative diseases. However, the mechanisms of action of auranofin have not been well defined. In the present study, we identify vascular endothelial growth factor receptor-3 (VEGFR3), an endothelial cell (EC) surface receptor essential for angiogiogenesis and lymphangiogenesis, as a novel target of auranofin. In both primary EC and EC cell lines, auranofin induces downregulation of VEGFR3 in a dose-dependent manner. Auranofin at high doses (≥1 µM) decreases cellular survival protein thioredoxin reductase (TrxR2), TrxR2-dependent Trx2 and transcription factor NF-κB whereas increases stress signaling p38MAPK, leading to EC apoptosis. However, auranofin at low doses (≤0.5 µM) specifically induces downregulation of VEGFR3 and VEGFR3-mediated EC proliferation and migration, two critical steps required for in vivo lymphangiogenesis. Mechanistically, we show that auranofin-induced VEGFR3 downregulation is blocked by antioxidant N-acetyl-L-cysteine (NAC) and lysosome inhibitor chloroquine, but is promoted by proteasomal inhibitor MG132. These results suggest that auranofin induces VEGFR3 degradation through a lysosome-dependent pathway. Auranofin may be a potent therapeutic agent for the treatment of lymphangiogenesis-dependent diseases such as lymphedema and cancer metastasis.

Keywords: Auranofin, lymphangiogenesis, thioredoxin reductase, vascular endothelial growth factor receptor-3.

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Article Details

Volume: 14
Issue Number: 7
First Page: 946
Last Page: 954
Page Count: 9
DOI: 10.2174/1871520614666140610102651
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