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DUSP3 modulates IRES-dependent translation of mRNAs through dephosphorylation of the HNRNPC protein in cells under genotoxic stimulus 在基因毒性刺激下,DUSP3通过使细胞中的HNRNPC蛋白去磷酸化来调节依赖于IRES的mRNA翻译。
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2024-03-27 DOI: 10.1111/boc.202300128
Pault Y. M. Ferruzo, Viktor K. Boell, Lilian C. Russo, Carla C. Oliveira, Fabio L. Forti

Background Information

The dual-specificity phosphatase 3 (DUSP3) regulates cell cycle progression, proliferation, senescence, and DNA repair pathways under genotoxic stress. This phosphatase interacts with HNRNPC protein suggesting an involvement in the regulation of HNRNPC-ribonucleoprotein complex stability. In this work, we investigate the impact of DUSP3 depletion on functions of HNRNPC aiming to suggest new roles for this enzyme.

Results

The DUSP3 knockdown results in the tyrosine hyperphosphorylation state of HNRNPC increasing its RNA binding ability. HNRNPC is present in the cytoplasm where it interacts with IRES trans-acting factors (ITAF) complex, which recruits the 40S ribosome on mRNA during protein synthesis, thus facilitating the translation of mRNAs containing IRES sequence in response to specific stimuli. In accordance with that, we found that DUSP3 is present in the 40S, monosomes and polysomes interacting with HNRNPC, just like other previously identified DUSP3 substrates/interacting partners such as PABP and NCL proteins. By downregulating DUSP3, Tyr-phosphorylated HNRNPC preferentially binds to IRES-containing mRNAs within ITAF complexes preferentially in synchronized or stressed cells, as evidenced by the higher levels of proteins such as c-MYC and XIAP, but not their mRNAs such as measured by qPCR. Under DUSP3 absence, this increased phosphorylated-HNRNPC/RNA interaction reduces HNRNPC-p53 binding in presence of RNAs releasing p53 for specialized cellular responses. Similarly, to HNRNPC, PABP physically interacts with DUSP3 in an RNA-dependent manner.

Conclusions and Significance

Overall, DUSP3 can modulate cellular responses to genotoxic stimuli at the translational level by maintaining the stability of HNRNPC-ITAF complexes and regulating the intensity and specificity of RNA interactions with RRM-domain proteins.

背景信息双特异性磷酸酶 3(DUSP3)调节细胞周期的进展、增殖、衰老以及基因毒性应激下的 DNA 修复途径。这种磷酸酶与 HNRNPC 蛋白相互作用,表明它参与了 HNRNPC 核蛋白复合物稳定性的调控。在这项工作中,我们研究了 DUSP3 缺失对 HNRNPC 功能的影响,旨在为这种酶提出新的作用:结果:敲除 DUSP3 会导致 HNRNPC 处于酪氨酸过度磷酸化状态,从而增强其 RNA 结合能力。HNRNPC存在于细胞质中,它与IRES反式作用因子(ITAF)复合物相互作用,后者在蛋白质合成过程中将40S核糖体募集到mRNA上,从而在特定刺激下促进含有IRES序列的mRNA的翻译。据此,我们发现 DUSP3 存在于 40S、单体和多聚体中,与 HNRNPC 相互作用,就像之前发现的其他 DUSP3 底物/相互作用伙伴(如 PABP 和 NCL 蛋白)一样。通过下调 DUSP3,Tyr 磷酸化的 HNRNPC 在同步或受压细胞中会优先与 ITAF 复合物内含 IRES 的 mRNA 结合,这体现在 c-MYC 和 XIAP 等蛋白质的水平较高,但通过 qPCR 测定,它们的 mRNA 水平并不高。在 DUSP3 缺失的情况下,磷酸化-HNRNPC/RNA 相互作用的增加减少了 HNRNPC-p53 与 RNA 的结合,从而释放出 p53 用于专门的细胞反应。与 HNRNPC 类似,PABP 也以 RNA 依赖性方式与 DUSP3 发生物理相互作用:总之,DUSP3 可通过维持 HNRNPC-ITAF 复合物的稳定性以及调节 RNA 与 RRM 域蛋白相互作用的强度和特异性,在翻译水平上调节细胞对基因毒性刺激的反应。
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引用次数: 0
Deletion of Dictyostelium tpc2 gene forms multi-tipped structures, regulates autophagy and cell-type patterning 竹荪 tpc2 基因缺失会形成多尖端结构,调节自噬和细胞类型模式化。
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2024-03-27 DOI: 10.1111/boc.202300067
Madhubala Rathore, Ashima Thakur, Shweta Saran

Background Information

Two pore channels (TPCs) are voltage-gated ion channel superfamily members that release Ca2+ from acidic intracellular stores and are ubiquitously present in both animals and plants. Starvation initiates multicellular development in Dictyostelium discoideum. Increased intracellular calcium levels bias Dictyostelium cells towards the stalk pathway and thus we decided to analyze the role of TPC2 in development, differentiation, and autophagy.

Results

We showed TPC2 protein localizes in lysosome-like acidic vesicles and the in situ data showed stalk cell biasness. Deletion of tpc2 showed defective and delayed development with formation of multi-tipped structures attached to a common base, while tpc2OE cells showed faster development with numerous small-sized aggregates and wiry fruiting bodies. The tpc2OE cells showed higher intracellular cAMP levels as compared to the tpc2 cells while pinocytosis was found to be higher in the tpc2 cells. Also, TPC2 regulates cell-substrate adhesion and cellular morphology. Under nutrient starvation, deletion of tpc2 reduced autophagic flux as compared to Ax2. During chimera formation, tpc2 cells showed a bias towards the prestalk/stalk region while tpc2OE cells showed a bias towards the prespore/spore region. tpc2 deficient strain exhibits aberrant cell-type patterning and loss of distinct boundary between the prestalk/prespore regions.

Conclusion

TPC2 is required for effective development and differentiation in Dictyostelium and supports autophagic cell death and cell-type patterning.

Significance

Decreased calcium due to deletion of tpc2 inhibit autophagic flux.

背景信息:双孔通道(TPCs)是电压门控离子通道超家族成员,可从酸性细胞内贮存释放 Ca2+,在动物和植物中普遍存在。饥饿启动了盘基竹荪的多细胞发育。细胞内钙含量的增加会使竹荪细胞偏向茎途径,因此我们决定分析 TPC2 在发育、分化和自噬中的作用:结果:我们发现TPC2蛋白定位于溶酶体样酸性囊泡中,原位数据显示了柄细胞的偏向性。缺失 tpc2 的细胞发育缺陷和延迟,会形成连接到一个共同基部的多尖结构,而 tpc2OE 细胞则发育较快,会形成许多小尺寸的聚集体和毛状子实体。与 tpc2-细胞相比,tpc2OE 细胞显示出更高的细胞内 cAMP 水平,同时发现 tpc2-细胞的针状细胞增多。此外,TPC2 还调节细胞与基质的粘附和细胞形态。在营养饥饿条件下,与Ax2相比,缺失tpc2会降低自噬通量。在嵌合体形成过程中,tpc2-细胞偏向于前柄/柄区,而tpc2OE细胞偏向于前孢子/孢子区:结论:TPC2 是竹荪有效发育和分化所必需的,并支持自噬细胞死亡和细胞类型模式化:意义:tpc2缺失导致的钙质减少会抑制自噬通量。
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引用次数: 0
BRCA1 deficiency enhances the aggressiveness of breast cancer cells expressing HPV16 oncoproteins BRCA1 缺乏会增强表达 HPV16 肿瘤蛋白的乳腺癌细胞的侵袭性。
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2024-03-21 DOI: 10.1111/boc.202300072
Jariya Sangthong, Chanitra Thuwajit, Laran T. Jensen, Waraporn Komyod, Jirundon Yuvaniyama, Mathurose Ponglikitmongkol

Background Information

The precise etiology of breast cancer is not completely understood, although women with BRCA1 gene mutations have a significantly increased risk of developing the disease. In addition, sporadic breast cancer is frequently associated with decreased BRCA1 gene expression. Growing evidence of Human papillomaviruses (HPVs) infections in breast tumors has raised the possibility of the involvement of HPVs in the pathogenesis of breast cancer. We investigated whether the effects of HPV oncoproteins E6 and E7 were influenced by the expression levels of BRCA1. HPV16E6E7 (prototype or E6D25E/E7N29S Asian variant type) were stably expressed in MDA-MB231 breast cancer cells, wild type for BRCA1, or with BRCA1 knocked down.

Results

Expression of HPV16E6E7 oncogenes did not affect BRCA1 levels and the abundance of HPV16E6E7 was not altered by BRCA1 knockdown. BRCA1 levels did not alter HPV16E6E7-dependent degradation of G1-S cell cycle proteins p53 and pRb. However, we found that the expression of G2-M cell cycle protein cyclin B1 enhanced by HPV16E6E7 was impacted by BRCA1 levels. Especially, we found the correlation between BRCA1 and cyclin B1 expression and this was also confirmed in breast cancer samples from a Thai cohort. We further demonstrated that the combination of HPV oncoproteins and low levels of BRCA1 protein appears to enhance proliferation and invasion. Transactivation activities of HPV16E6E7 on genes regulating cell proliferation and invasion (TGF-β and vimentin) were significantly increased in BRCA1-deficient cells.

Conclusions

Our results indicate that a deficiency of BRCA1 promotes the transactivation activity of HPV16E6E7 leading to increase of cell proliferation and invasion.

Significance

HPV infection appears to have the potential to enhance the aggressiveness of breast cancers, especially those deficient in BRCA1.

背景信息虽然 BRCA1 基因突变的妇女患病风险显著增加,但乳腺癌的确切病因尚未完全明了。此外,散发性乳腺癌常常与 BRCA1 基因表达减少有关。越来越多的证据表明,乳腺肿瘤中存在人乳头状瘤病毒(HPV)感染,这就提出了 HPV 参与乳腺癌发病机制的可能性。我们研究了 HPV 肿瘤蛋白 E6 和 E7 的作用是否受 BRCA1 表达水平的影响。HPV16E6E7(原型或 E6D25E/E7N29S 亚洲变异型)在 BRCA1 野生型或 BRCA1 被敲除的 MDA-MB231 乳腺癌细胞中稳定表达:结果:HPV16E6E7 致癌基因的表达不会影响 BRCA1 的水平,BRCA1 基因敲除也不会改变 HPV16E6E7 的丰度。BRCA1水平不会改变HPV16E6E7依赖的G1-S细胞周期蛋白p53和pRb的降解。然而,我们发现,HPV16E6E7增强的G2-M细胞周期蛋白细胞周期蛋白B1的表达受BRCA1水平的影响。特别是,我们发现 BRCA1 和细胞周期蛋白 B1 的表达之间存在相关性,这一点在泰国队列的乳腺癌样本中也得到了证实。我们进一步证明,HPV 癌蛋白与低水平的 BRCA1 蛋白结合似乎会增强增殖和侵袭。在 BRCA1 缺乏的细胞中,HPV16E6E7 对细胞增殖和侵袭调控基因(TGF-β 和波形蛋白)的反式激活活性显著增加:我们的研究结果表明,BRCA1的缺乏会促进HPV16E6E7的转录活性,从而导致细胞增殖和侵袭的增加:HPV感染似乎有可能增强乳腺癌的侵袭性,尤其是那些缺乏BRCA1的乳腺癌。
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引用次数: 0
Editorial for the “Cell Energetics & Cell Mechanics” themed issues 为 "细胞能量学与细胞力学 "主题刊物撰写编辑文章。
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2024-03-17 DOI: 10.1111/boc.202400026
René Marc Mège, Geri Kreitzer
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引用次数: 0
Testicular niche repair after gonadotoxic treatments: Current knowledge and future directions 性腺毒素治疗后的睾丸龛修复:现有知识和未来方向
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2024-03-12 DOI: 10.1111/boc.202300123
Amirhossein Mohammadi, Zahra Bashiri, Sara Rafiei, Hamidreza Asgari, Ronak Shabani, SeyedJamal Hosseini, Morteza Koruji

The testicular niche, which includes the germ cells, somatic cells, and extracellular matrix, plays a crucial role in maintaining the proper functions of the testis. Gonadotoxic treatments, such as chemotherapy and radiation therapy, have significantly improved the survival rates of cancer patients but have also been shown to have adverse effects on the testicular microenvironment. Therefore, repairing the testicular niche after gonadotoxic treatments is essential to restore its function. In recent years, several approaches, such as stem cell transplantation, gene therapy, growth factor therapy, and pharmacological interventions have been proposed as potential therapeutic strategies to repair the testicular niche. This comprehensive review aims to provide an overview of the current understanding of testis damage and repair mechanisms. We will cover a range of topics, including the mechanism of gonadotoxic action, repair mechanisms, and treatment approaches. Overall, this review highlights the importance of repairing the testicular niche after gonadotoxic treatments and identifies potential avenues for future research to improve the outcomes for cancer survivors.

睾丸微环境包括生殖细胞、体细胞和细胞外基质,在维持睾丸正常功能方面发挥着至关重要的作用。化疗和放疗等性腺毒性治疗显著提高了癌症患者的生存率,但也显示出对睾丸微环境的不利影响。因此,在性腺毒性治疗后修复睾丸生态位对于恢复其功能至关重要。近年来,干细胞移植、基因治疗、生长因子治疗和药物干预等几种方法被提出作为修复睾丸龛的潜在治疗策略。本综述旨在概述目前对睾丸损伤和修复机制的认识。我们将讨论一系列主题,包括性腺毒性作用机制、修复机制和治疗方法。总之,本综述强调了性腺毒性治疗后修复睾丸生态位的重要性,并确定了未来研究的潜在途径,以改善癌症幸存者的预后。
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引用次数: 0
Cells flowing to attain functionality 细胞为实现功能而流动。
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2024-03-05 DOI: 10.1111/boc.202300120
Martín G. Bellino

Unraveling the fundamental biological processes underpinning cell functions and behavior remains a key challenge. Researchers working on cell biological processes might want to take a look at microscale cell flow as functionality genesis. This Commentary provides an outlook on how cell-microcirculation interplay promises to lead to exciting insights into the cell biology complexity.

揭示细胞功能和行为的基本生物过程仍然是一项关键挑战。研究细胞生物学过程的科研人员不妨将微尺度细胞流动视为功能的起源。这篇评论展望了细胞与微循环之间的相互作用如何有望为细胞生物学的复杂性带来令人兴奋的启示。
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引用次数: 0
Diosgenyl glucosamine conjugates increase pro-apoptotic and selective activities in cancer cell lines 二异源葡糖胺共轭物提高了癌细胞株的促凋亡活性和选择性活性。
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2024-02-26 DOI: 10.1111/boc.202300052
Martínez Mata Sergio Iván, Escobar Sánchez María Luisa, López Muñoz Hugo, Hilario Martínez Jazmín Ciciolil, Sandoval Ramírez Jesús, Aparicio Sánchez Uriel Yair, Sánchez Sánchez Luis

Background Information

Antiproliferative and apoptotic activities have been attributed to the phytosteroid diosgenin ((25R)-spirost-5-en-3β-ol; 1). It is known that combining glucose with two rhamnoses (the chacotrioside framework) linked to diosgenin increases its apoptotic activity. However, the effects of diosgenin glucosamine glycosides on different cancer cell types and cell death have not been entirely explored.

Results

This study reports the antiproliferative, cytotoxic, and apoptotic activities of diosgenin and its glycosylated derivative ((25R)-spirost-5-en-3β-yl β-D-glucopyranoside; 2). It also explores the effects of two diosgenin glucosamine derivates, diosgenin 2-acetamido-2-deoxy-β-D-glucopyranoside (3), and diosgenin 2-amino-2-deoxy-β-D-glucopyranoside hydrochloride (4), on different cancer cell lines. We found that all the compounds affected proliferative activity with minimal toxicity. In addition, all cancer cell lines showed morphological and biochemical characteristics corresponding to an apoptotic process. Apoptotic cell death was higher in all cell lines treated with compounds 2, 3 and 4 than in those treated with diosgenin. Moreover, compounds 3 and 4 induced apoptosis better than compounds 1 and 2. These results suggest that combining glucosamine with modified glucosamine attached to diosgenin has a greater apoptotic effect than diosgenin or its glycosylated derivative (compound 2). Furthermore, diosgenin and the abovementioned glycosides had a selective effect on tumour cells since the proliferative capacity of human lymphocytes, keratinocytes (HaCaT) and epithelial cells (CCD841) was not significantly affected.

Conclusions

Altogether, these results demonstrate that diosgenin glucosamine compounds exert an antiproliferative effect on cancer cell lines and induce apoptotic effects more efficiently than diosgenin alone without affecting non-tumour cells.

Significance

This study evidences the pro-apoptotic and selective activities of diosgenyl glucosamine compounds in cancer cell lines.

背景信息:植物类固醇 diosgenin((25R)-螺甾-5-烯-3β-醇;1)具有抗增殖和细胞凋亡活性。众所周知,将葡萄糖与与薯蓣皂苷相连的两个鼠李糖(查考三糖苷框架)结合在一起可增加其凋亡活性。然而,有关薯蓣皂苷葡萄糖胺苷对不同癌细胞类型和细胞死亡的影响尚未完全探明:本研究报告了薯蓣皂苷及其糖基化衍生物((25R)-螺甾-5-烯-3β-基 β-D-吡喃葡萄糖苷;2)的抗增殖、细胞毒性和细胞凋亡活性。本研究还探讨了两种薯蓣皂苷氨基葡萄糖衍生物,即薯蓣皂苷 2-乙酰氨基-2-脱氧-β-D-吡喃葡萄糖苷(3)和薯蓣皂苷 2-氨基-2-脱氧-β-D-吡喃葡萄糖苷盐酸盐(4)对不同癌细胞株的影响。我们发现,所有化合物都能影响细胞的增殖活性,且毒性极低。此外,所有癌细胞株都表现出与凋亡过程相应的形态和生化特征。与使用薯蓣皂苷处理的细胞株相比,使用化合物 2、3 和 4 处理的细胞株凋亡率更高。此外,化合物 3 和 4 比化合物 1 和 2 更能诱导细胞凋亡。这些结果表明,将氨基葡萄糖与附着于二缩二烯醇的改性氨基葡萄糖相结合,比二缩二烯醇或其糖基化衍生物(化合物 2)具有更强的凋亡效应。此外,薯蓣皂苷和上述苷类对肿瘤细胞具有选择性作用,因为人类淋巴细胞、角质细胞(HaCaT)和上皮细胞(CCD841)的增殖能力没有受到明显影响:总之,这些结果表明,双歧因子氨基葡萄糖化合物对癌细胞株具有抗增殖作用,并且比单独使用双歧因子更有效地诱导细胞凋亡,而不影响非肿瘤细胞:这项研究证明了双歧氨基葡萄糖化合物对癌细胞株的促凋亡和选择性活性。
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引用次数: 0
Lamin A K97E leads to NF-κB-mediated dysfunction of inflammatory responses in dilated cardiomyopathy Lamin A K97E导致扩张型心肌病中NF-κB介导的炎症反应功能障碍。
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2024-02-25 DOI: 10.1111/boc.202300094
Duhita Sengupta, Kaushik Sengupta

Background Information

Lamins are type V intermediate filament proteins underlying the inner nuclear membrane which provide structural rigidity to the nucleus, tether the chromosomes, maintain nuclear homeostasis, and remain dynamically associated with developmentally regulated regions of the genome. A large number of mutations particularly in the LMNA gene encoding lamin A/C results in a wide array of human diseases, collectively termed as laminopathies. Dilated Cardiomyopathy (DCM) is one such laminopathic cardiovascular disease which is associated with systolic dysfunction of left or both ventricles leading to cardiac arrhythmia which ultimately culminates into myocardial infarction.

Results

In this work, we have unraveled the epigenetic landscape to address the regulation of gene expression in mouse myoblast cell line in the context of the missense mutation LMNA 289A<G (Lys97Glu) that is found in DCM-afflicted patient with severe symptoms. Significant changes in H3-specific epigenetic modifications indicated a dysregulation in transcription machinery which was investigated by RNA sequencing analysis. The major pathways involved in IL-17 signaling, cellular response to interferon-beta and gamma, cytokine production, and related pathways are found to be downregulated. Analysis of the promoter sequences of the genes in the abovementioned pathways led us to the master regulator NF-κB and its regulatory network.

Conclusions

We report here for the first time that there is a significant downregulation of the NF-κB pathway, which has been implicated in cardio-protection elsewhere.

Significance

This provides a new pathophysiological explanation that correlates an LMNA mutation and dilated cardiomyopathy.

背景信息片层蛋白是核内膜底层的 V 型中间丝蛋白,它为细胞核提供结构刚度,拴住染色体,维持核平衡,并与基因组中受发育调控的区域保持动态关联。大量基因突变,尤其是编码片层蛋白 A/C的 LMNA 基因突变,导致了一系列人类疾病,统称为片层蛋白病。扩张型心肌病(DCM)就是这样一种板层病心血管疾病,它与左心室或双心室收缩功能障碍有关,导致心律失常,最终导致心肌梗死:在这项工作中,我们揭开了表观遗传学的面纱,研究了小鼠成肌细胞系在LMNA 289AC错义突变背景下的基因表达调控:我们在此首次报告了NF-κB通路的显著下调,该通路在其他地方被认为与心脏保护有关:意义:这提供了一种新的病理生理学解释,将 LMNA 突变与扩张型心肌病联系起来。
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引用次数: 0
To squeeze or not: Regulation of cell size by mechanical forces in development and human diseases 挤压或不挤压:发育和人类疾病中机械力对细胞大小的调节。
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-12-07 DOI: 10.1111/boc.202200101
Aurore Claude-Taupin, Nicolas Dupont

Physical constraints, such as compression, shear stress, stretching and tension play major roles during development and tissue homeostasis. Mechanics directly impact physiology, and their alteration is also recognized as having an active role in driving human diseases. Recently, growing evidence has accumulated on how mechanical forces are translated into a wide panel of biological responses, including metabolism and changes in cell morphology. The aim of this review is to summarize and discuss our knowledge on the impact of mechanical forces on cell size regulation. Other biological consequences of mechanical forces will not be covered by this review. Moreover, wherever possible, we also discuss mechanosensors and molecular and cellular signaling pathways upstream of cell size regulation. We finally highlight the relevance of mechanical forces acting on cell size in physiology and human diseases.

物理约束,如压缩、剪切应力、拉伸和张力在发育和组织稳态中起着重要作用。力学直接影响生理学,其改变也被认为在驱动人类疾病中具有积极作用。最近,越来越多的证据表明,机械力是如何转化为广泛的生物反应的,包括代谢和细胞形态的变化。这篇综述的目的是总结和讨论我们对机械力对细胞大小调节的影响的知识。机械力的其他生物学后果将不在本综述中讨论。此外,在可能的情况下,我们还讨论了机械传感器以及细胞大小调节上游的分子和细胞信号通路。我们最后强调了机械力在生理和人类疾病中作用于细胞大小的相关性。这篇文章受版权保护。版权所有。
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引用次数: 0
DDX5 enhances HIF-1 activity by promoting the interaction of HIF-1α with HIF-1β and recruiting the resulting heterodimer to its target gene loci DDX5通过促进HIF-1α与HIF-1β的相互作用,并将产生的异源二聚体募集到其靶基因位点,从而增强HIF-1的活性。
IF 2.7 4区 生物学 Q2 Biochemistry, Genetics and Molecular Biology Pub Date : 2023-11-30 DOI: 10.1111/boc.202300077
Yukari Shirai, Tatsuya Suwa, Minoru Kobayashi, Sho Koyasu, Hiroshi Harada

Background Information

Cancer cells acquire malignant characteristics and therapy resistance by employing the hypoxia-inducible factor 1 (HIF-1)-dependent adaptive response to hypoxic microenvironment in solid tumors. Since the underlying molecular mechanisms remain unclear, difficulties are associated with establishing effective therapeutic strategies.

Results

We herein identified DEAD-box helicase 5 (DDX5) as a novel activator of HIF-1 and found that it enhanced the heterodimer formation of HIF-1α and HIF-1β and facilitated the recruitment of the resulting HIF-1 to its recognition sequence, hypoxia-response element (HRE), leading to the expression of a subset of cancer-related genes under hypoxia.

Conclusions

This study reveals that the regulation of HIF-1 recruitment to HRE is an important regulatory step in the control of HIF-1 activity.

Significance

The present study provides novel insights for the development of strategies to inhibit the HIF-1-dependent expression of cancer-related genes.

在实体瘤中,癌细胞通过缺氧诱导因子1 (HIF-1)依赖性的适应性反应获得恶性特征和治疗耐药性。由于潜在的分子机制尚不清楚,因此建立有效的治疗策略存在困难。我们在此发现DEAD-box解旋酶5 (DDX5)是HIF-1的一种新的激活剂,发现它增强了HIF-1α和HIF-1β异源二聚体的形成,并促进了由此产生的HIF-1的募集到其识别方法:序列,缺氧反应元件(HRE),导致缺氧下癌症相关基因亚群的表达。本研究揭示了HIF-1激活的分子机制,并为开发抑制HIF-1依赖性癌症相关基因表达的策略提供了新的见解。这篇文章受版权保护。版权所有。
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引用次数: 0
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