2. Academic Validation
  3. ALOX5 Promotes Autophagy-dependent Ferroptosis by Activating the AMPK/mTOR Pathway in Melanoma

ALOX5 Promotes Autophagy-dependent Ferroptosis by Activating the AMPK/mTOR Pathway in Melanoma

  • Biochem Pharmacol. 2023 Apr 18;115554. doi: 10.1016/j.bcp.2023.115554.
Min Wang 1,  Guang Zeng 2,  Bingrui Xiong 3,  Xiaobin Zhu 4,  Jia Guo 5,  Danyang Chen 5,  Shanshan Zhang 6,  Min Luo 7,  Liang Guo 8,  Lin Cai 9
Affiliations

Affiliations

  • 1 Department of Spine Surgery and Musculoskeletal Tumor, Zhongnan Hospital of Wuhan University, Wuhan, China; Department of Plastic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, China.
  • 2 Department of Urology, Zhongnan Hospital of Wuhan University, Wuhan, China.
  • 3 Department of Anesthesiology, Zhongnan Hospital, Wuhan University, Wuhan, China.
  • 4 Department of Spine Surgery and Musculoskeletal Tumor, Zhongnan Hospital of Wuhan University, Wuhan, China.
  • 5 Department of Plastic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, China.
  • 6 Department of Biological Repositories, Zhongnan Hospital of Wuhan University, Wuhan, China.
  • 7 Department of Radiation and Medical Oncology, Zhongnan Hospital of Wuhan University,China. Electronic address: ZN003597@whu.edu.cn.
  • 8 Department of Plastic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, China. Electronic address: guolianghbwh@163.com.
  • 9 Department of Spine Surgery and Musculoskeletal Tumor, Zhongnan Hospital of Wuhan University, Wuhan, China. Electronic address: orthopedics@whu.edu.cn.
PMID: 37080437 DOI: 10.1016/j.bcp.2023.115554
Abstract

Background: Melanoma has become more common, and its therapeutic management has remained challenging in recent decades. The purpose of our study is to explore new prognostic therapeutic markers of melanoma and to find new therapeutic methods and therapeutic targets of novel drugs, which have great significance.

Method: First, the arachidonate 5-lipoxygenase (ALOX5) gene associated with both Autophagy and Ferroptosis was identified by R version 4.2.0. We used human melanoma and para-cancer tissues, human melanoma cell lines, and melanoma-bearing mouse tissues. We used qRT-PCR, Western blotting, immunohistochemistry, immunofluorescence staining, CCK-8, iron ion assay, GSH assay, and MDA assay. In vivo, the Ferroptosis activation and antitumor effects of recombinant human ALOX5 protein were evaluated using a xenograft model.

Result: We report that the downregulation of ALOX5 in melanoma is positively correlated with the prognosis of patients and is an independent prognostic factor. Elevated ALOX5 contributes to Autophagy and Ferroptosis in vitro and in vivo. At the same time, inhibition of Autophagy can reduce Ferroptosis enhanced by ALOX5, and Autophagy and ALOX5 have a synergistic effect. The results of the mechanistic study showed that the increase in ALOX5 could activate the AMPK/mTOR pathway and inhibit GPX4 expression, promoting the occurrence of autophagy-dependent Ferroptosis, while the decrease in p-AMPK/AMPK inhibited the occurrence of Ferroptosis.

Conclusion: ALOX5 deficiency was resistant to Autophagy and Ferroptosis by inhibiting the AMPK/mTOR pathway. Therefore, it can provide new targets and methods for melanoma drug development.

Keywords

ALOX5; AMPK-mTOR pathway; Autophagy; Ferroptosis; Melanoma.

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