ABCB5 promotes melanoma metastasis through enhancing NF-κB p65 protein stability.

Abstract

Melanoma is the most aggressive type of skin cancer. Melanoma has an extremely poor prognosis because of its high potential for vascular invasion, metastasis and recurrence. The mechanism of melanoma metastasis is not well understood. ATP-binding cassette sub-family B member 5 (ABCB5) plays a key role in melanoma growth. However, it is uncertain what function ABCB5 may exert in melanoma metastasis. In this report, we for the first time demonstrate ABCB5 as a crucial factor that promotes melanoma metastasis. ABCB5 positive (ABCB5+) malignant melanoma initiating cells (MMICs) display a higher metastatic potential compared with ABCB5 negative (ABCB5-) melanoma subpopulation. Knockdown of ABCB5 expression reduces melanoma cell migration and invasion in vitro and melanoma pulmonary metastasis in tumor xenograft mice. ABCB5 and NF-κB p65 expression levels are positively correlated in both melanoma tissues and cell lines. Consequently, ABCB5 activates the NF-κB pathway by inhibiting p65 ubiquitination to enhance p65 protein stability. Our finding highlights ABCB5 as a novel pro-metastasis factor and provides a potential therapeutic target for melanoma.

• Authors: Shenghao Wang, Li Tang, Junyu Lin, Zhongliang Shen, Yikun Yao, Wei Wang, Shuai Tao, Chenjian Gu, Jie Ma, Youhua Xie, Yanfeng Liu
• Journal: Biochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 492 Issue 1 Pg. 18-26 (10 07 2017) ISSN: 1090-2104 [Electronic] United States
• PMID: 28821433 (Publication Type: Journal Article)
• Copyright: Copyright © 2017 Elsevier Inc. All rights reserved.

Chemical References

• ABCB5 protein, human
• ATP Binding Cassette Transporter, Subfamily B
• ATP Binding Cassette Transporter, Subfamily B, Member 1
• Transcription Factor RelA

Topics

• ATP Binding Cassette Transporter, Subfamily B
• ATP Binding Cassette Transporter, Subfamily B, Member 1 (deficiency, genetics, metabolism)
• Animals
• Cell Movement
• Cells, Cultured
• Humans
• Male
• Melanoma (metabolism, pathology)
• Mice
• Mice, Inbred BALB C
• Mice, Nude
• Neoplasm Metastasis
• Neoplasms, Experimental (metabolism, pathology)
• Protein Stability
• Transcription Factor RelA (metabolism)