Cell Death Discovery
·
2024
·Vol. 10
·期 1
·1-11
·
IF 6.1
Zheng Guopei,Shi Jiahao,Li Qian,Jin Xiaoliang,Fang Yan,Zhang Zhe,Cao Qin,Zhu Lili,Shen Jianfeng
BRCA1-associated protein 1 (BAP1) acts as a tumor suppressor and can affect the cell cycle, tumor immunity, and cellular metabolism through multiple pathways. In melanoma, BAP1 mutations promote tumor cell glycolysis, leading to increased lactate production. The tumor microenvironment with high lactate levels is often associated with immunosuppression and tumor progression. The inhibitory effect of BAP1 on glycolysis has been found in a variety of tumors, but the specific mechanism by which BAP1 inhibits lactate production still needs to be elucidated. In this study, we show that BAP1 can interact directly with lactate dehydrogenase (LDHA), causing LDHA to accumulate in the nucleus. Conversely, BAP1 deletion leads to the accumulation of LDHA in the cytoplasm, catalyzing the production of lactate from pyruvate that results in increased lactate levels inside and outside the cell. By elucidating the interaction between BAP1 and LDHA and the subsequent effects on lactate production in melanoma cells, this work provides insights into the mechanism of BAP1-mediated metabolic regulation. Furthermore, it may provide novel directions for the clinical treatment of BAP1-mutant melanoma.
研究领域:
肿瘤学
·
分子生物学
·
细胞生物学
·
癌症代谢
✓ 已验证
DOI
PubMed
高影响因子
BIOCHEMICAL PHARMACOLOGY
·
2024
·
IF 5.3
Tingyu Qin,Yingnan Lv,Xiangying Xi,Zhipeng Wu
Diabetic retinopathy (DR) is a microvascular complication of diabetes mellitus, and its main clinical manifestation is retinal vascular dysfunction. DR causes blindness and is a problem with significant global health implications. However, treating DR is still challenging. In this study, we aimed to explore the role of polo-like kinase-3 (PLK-3) and the potential regulatory mechanism in DR. Sprague-Dawley rats were injected intraperitoneally with streptozotocin (STZ, 60 mg/kg) to induce a rat model of DR, and rat retinal microvascular endothelial cells (RRMECs) were treated with high glucose (HG, 25 mmol/L glucose) to develop a cell model of DR. We found that PLK-3 was significantly downregulated in the retinal tissues of STZ-induced diabetic rats and HG-induced RRMECs. Lentivirus-mediated PLK-3 overexpression alleviated the histological damages in DR rats. After HG stimulation, cell proliferation, migration, and angiogenesis in RRMECs were inhibited after PLK-3 upregulation. By using label-free proteomics, we identified 82 differentially expressed proteins downstream of PLK-3, including BRCA1-associated protein 1 (BAP1), which was significantly upregulated in PLK-3-overexpressed RRMECs compared to control cells under the HG condition. In vivo and in vitro assays indicated that the forced expression of PLK-3 increased the phosphorylation of BAP1 at serine 592 and caspase-8 expression. Detailed evidence showed that BAP1-shRNA-mediated knockdown restored the cell function in HG-treated RRMECs when PLK-3 was overexpressed. Collectively, this study shows that PLK-3 alleviates retinal vascular dysfunction in DR by inhibiting the phosphorylation of BAP1. Thus, PLK-3 may develop as a promising target for the therapy of DR.
研究领域:
糖尿病
·
眼科
·
分子生物学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELL DEATH AND DIFFERENTIATION
·
2025
·
IF 15.4
Fan Kexin,Zhou Shuting,Ren Yakun,Xiong Jingwen,Wang Hua,Fu Yaxin,Chen Yuhan,Wang Bobo,Fan Kun,Gao Min,Guo Tingli,Wei Xiaofeng,Jiao Lianying,Shi Jiejun,Ding Chenguang,Zhang Yilei
The tumor suppressor BRCA1-associated protein 1 (BAP1) encodes a nuclear deubiquitinase that specifically removes H2A monoubiquitination at Lys119 (H2Aub) and plays a crucial role in the epigenetic regulation of gene expression through cooperating with several transcriptional factors and chromatin-modifying enzymes. Our previous studies have confirmed that BAP1 represses SLC7A11-mediated cystine metabolism and promotes ferroptosis-dependent tumor suppression. However, how BAP1 regulates gene expression at the genome level and whether additional mechanisms are involved in the BAP1 regulation of ferroptosis remain unclear. Here, we integrate multi-omics analyses to explore the effects of BAP1-mediated H2Aub deubiquitination on the regulation of chromatin accessibility and gene transcription. Notably, we identified a novel target gene, ACSL4, which is positively regulated by BAP1 and contributes to BAP1-mediated ferroptosis. Importantly, genetic knockout or pharmacological inhibition of ACSL4 prevents the upregulation of lipid biosynthesis and ferroptotic cell death caused by BAP1. In addition, we demonstrated that BAP1-mediated regulation of gene expression and ferroptosis is dependent on ASXL family members instead of other BAP1-associated factors like FOXK1/2, HCFC1, and OGT. Together, our findings uncover a previously unappreciated epigenetic mechanism underlying the regulation of ACSL4 by H2A monoubiquitination, which connects ACSL4-mediated lipid metabolism to ferroptosis driven by BAP1, providing new insights into the understanding of metabolic regulation of BAP1-related diseases such as cancers.
研究领域:
癌症生物学
·
表观遗传学
·
细胞死亡
·
代谢
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）