MANF facilitates breast cancer cell survival under glucose-starvation conditions via PRKN-mediated mitophagy regulation.

Zhenchong Xiong, Lin Yang, Chao Zhang, Weiling Huang, Wenjing Zhong, Jiarong Yi, Jikun Feng, Xiazi Zouxu, Libing Song, Xi Wang
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Abstract

During tumor expansion, breast cancer (BC) cells often experience reactive oxygen species accumulation and mitochondrial damage because of glucose shortage. However, the mechanism by which BC cells deal with the glucose-shortage-induced oxidative stress remains unclear. Here, we showed that MANF (mesencephalic astrocyte derived neurotrophic factor)-mediated mitophagy facilitates BC cell survival under glucose-starvation conditions. MANF-mediated mitophagy also promotes fatty acid oxidation in glucose-starved BC cells. Moreover, during glucose starvation, SENP1-mediated de-SUMOylation of MANF increases cytoplasmic MANF expression through the inhibition of MANF's nuclear translocation and hence renders mitochondrial distribution of MANF. MANF mediates mitophagy by binding to PRKN (parkin RBR E3 ubiquitin protein ligase), a key mitophagy regulator, in the mitochondria. Under conditions of glucose starvation, protein oxidation inhibits PRKN activity; nevertheless, the CXXC motif of MANF alleviates protein oxidation in RING II-domain of PRKN and restores its E3 ligase activity. Furthermore, MANF-PRKN interactions are essential for BC tumor growth and metastasis. High MANF expression predicts poor outcomes in patients with BC. Our results highlight the prosurvival role of MANF-mediated mitophagy in BC cells during glucose starvation, suggesting MANF as a potential therapeutic target.Abbreviation: 2DG, 2-deoxy-D-glucose; 5TG, 5-thio-D-glucose; ACSL4/FACL4, acyl-CoA synthetase long chain family member 4; Baf A1, bafilomycin A1; BRCA, breast cancer; CHX, cycloheximide; DMF, distant metastasis-free; DMFS, distant metastasis-free survival; ECM, extracellular matrix; ER, endoplasmic reticulum; ERS, endoplasmic reticulum stress; F-1,6-BP, fructose-1,6-bisphosphate; FAO, fatty acid oxidation; GSH, reduced glutathione; GSVA, gene set variation analysis; HCC, hepatocellular carcinoma; ICC, intrahepatic cholangiocarcinoma; IF, immunofluorescence; MANF, mesencephalic astrocyte derived neurotrophic factor; Mdivi-1, mitochondrial division inhibitor 1; MFI, mean fluorescence intensity; NAC, N-acetyl-L-cysteine; OCR, oxygen-consumption rate; OS, overall survival; PMI, SQSTM1/p62-mediated mitophagy inducer; PPP, pentose phosphate pathway; PRKN, parkin RBR E3 ubiquitin protein ligase; RBR, RING in between RING; RFS, relapse-free survival; ROS, reactive oxygen species; SAPLIPs, saposin-like proteins; TCGA, The Cancer Genome Atlas; TNBC, triple-negative breast cancer; WT, wild type.

MANF通过prkn介导的有丝分裂调控促进乳腺癌细胞在葡萄糖饥饿条件下存活。
在肿瘤扩展过程中,乳腺癌(BC)细胞常常会因葡萄糖短缺而出现活性氧积累和线粒体损伤。然而,乳腺癌细胞应对葡萄糖短缺诱导的氧化应激的机制仍不清楚。在这里,我们发现MANF(间脑星形胶质细胞衍生神经营养因子)介导的有丝分裂促进了BC细胞在葡萄糖饥饿条件下的存活。MANF 介导的有丝分裂还能促进葡萄糖饥饿 BC 细胞的脂肪酸氧化。此外,在葡萄糖饥饿过程中,SENP1介导的MANF去SUMOylation通过抑制MANF的核转位增加了细胞质中MANF的表达,从而使MANF在线粒体中的分布变得更加均匀。MANF通过与线粒体中的关键有丝分裂调节因子PRKN(parkin RBR E3泛素蛋白连接酶)结合来介导有丝分裂。在葡萄糖饥饿条件下,蛋白质氧化会抑制PRKN的活性;然而,MANF的CXXC基团会减轻PRKN的RING II-结构域中的蛋白质氧化,并恢复其E3连接酶的活性。此外,MANF与PRKN之间的相互作用对BC肿瘤的生长和转移至关重要。MANF的高表达预示着BC患者的不良预后。我们的研究结果突显了MANF介导的有丝分裂在葡萄糖饥饿期间对BC细胞的促生存作用,表明MANF是一个潜在的治疗靶点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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