Scavenging of Labile Heme by Hemopexin Is a Key Checkpoint in Cancer Growth and Metastases.

Scavenging of Labile Heme by Hemopexin Is a Key Checkpoint in Cancer Growth and Metastases.
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DOI:
10.1016/j.celrep.2020.108181
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发表时间:
2020-09-22
期刊:
影响因子:
8.8
通讯作者:
Wegiel B
Wegiel B
中科院分区:
生物学1区
文献类型:
--
作者:
Canesin G;Di Ruscio A;Li M;Ummarino S;Hedblom A;Choudhury R;Krzyzanowska A;Csizmadia E;Palominos M;Stiehm A;Ebralidze A;Chen SY;Bassal MA;Zhao P;Tolosano E;Hurley L;Bjartell A;Tenen DG;Wegiel B

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Hemopexin (Hx) is a scavenger of labile heme. Herein, we present data defining the role of tumor stroma-expressed Hx in suppressing cancer progression. Labile heme and Hx levels are inversely correlated in the plasma of patients with prostate cancer (PCa). Further, low expression of Hx in PCa biopsies characterizes poorly differentiated tumors and correlates with earlier time to relapse. Significantly, heme promotes tumor growth and metastases in an orthotopic murine model of PCa, with the most aggressive phenotype detected in mice lacking Hx. Mechanistically, labile heme accumulates in the nucleus and modulates specific gene expression via interacting with guanine quadruplex (G4) DNA structures to promote PCa growth. We identify c-MYC as a heme:G4-regulated gene and a major player in heme-driven cancer progression. Collectively, these results reveal that sequestration of labile heme by Hx may block heme-driven tumor growth and metastases, suggesting a potential strategy to prevent and/or arrest cancer dissemination. Canesin et al. describe a role and mechanism for labile heme as a key player in regulating gene expression to promote carcinogenesis via binding to G-quadruplex in the c-MYC promoter. Hemopexin, a heme scavenger, may be used as a strategy to block progression of cancer.
前列腺癌的基因表达谱揭示了多个分子途径在转移过程中的参与。
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