Regulation of the adaptation to ER stress by KLF4 facilitates melanoma cell metastasis via upregulating NUCB2 expression

Journal of Experimental & Clinical Cancer Research

Jingrong Lin¹  Binbin Ma²  Lu Zhang²  Wenzhi Zhao²  Na Li³  Lei Jin⁴  Dongmei Zhang⁴  Chuanchun Han⁴  Ruiping He⁴  Yulin Chao⁴ 

[1] Department of Dermatology, the First Affiliated Hospital, Dalian Medical University;Department of Orthopedics, Second Affiliated Hospital, Dalian Medical University;Department of Physiology, College of Basic Medical Sciences, Dalian Medical University;Institute of Cancer Stem Cell, Dalian Medical University;

关键词: Melanoma;    ER stress;    Apoptosis;    KLF4;    Metastasis;   

DOI  :  10.1186/s13046-018-0842-z

来源: DOAJ

【 摘 要 】

Abstract Background Adaptation to ER stress has been indicated to play an important role in resistance to therapy in human melanoma. However, the relationship between adaptation to ER stress and cell metastasis in human melanoma remains unclear. Methods The relationship of adaptation to ER stress and cell metastasis was investigated using transwell and mouse metastasis assays. The potential molecular mechanism of KLF4 in regulating the adaptation to ER stress and cell metastasis was investigated using RNA sequencing analysis, q-RT-PCR and western blot assays. The transcriptional regulation of nucleobindin 2 (NUCB2) by KLF4 was identified using bioinformatic analysis, luciferase assay, and chromatin immunoprecipitation (ChIP). The clinical significance of KLF4 and NUCB2 was based on human tissue microarray (TMA) analysis. Results Here, we demonstrated that KLF4 was induced by ER stress in melanoma cells, and increased KLF4 inhibited cell apoptosis and promoted cell metastasis. Further mechanistic studies revealed that KLF4 directly bound to the promoter of NUCB2, facilitating its transcription. Additionally, an increase in KLF4 promoted melanoma ER stress resistance, tumour growth and cell metastasis by regulating NCUB2 expression in vitro and in vivo. Elevated KLF4 was found in human melanoma tissues, which was associated with NUCB2 expression. Conclusion Our data revealed that the promotion of ER stress resistance via the KLF4-NUCB2 axis is essential for melanoma cell metastasis, and KLF4 may be a promising specific target for melanoma therapy.

【 授权许可】

Unknown