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Zhang Z, Liu D, Lv R, Zhao H, Li T, Huang Y, Tian Z, Gao X, Luo P, Li X. FBL Promotes LPS-Induced Neuroinflammation by Activating the NF-κB Signaling Pathway. J Inflamm Res 2024; 17:2217-2231. [PMID: 38623466 PMCID: PMC11018134 DOI: 10.2147/jir.s451049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 04/02/2024] [Indexed: 04/17/2024] Open
Abstract
Purpose Neuroinflammation occurs in response to central nervous system (CNS) injury, infection, stimulation by toxins, or autoimmunity. We previously analyzed the downstream molecular changes in HT22 cells (mouse hippocampal neurons) upon lipopolysaccharide (LPS) stimulation. We detected elevated expression of Fibrillarin (FBL), a nucleolar methyltransferase, but the associated proinflammatory mechanism was not systematically elucidated. The aim of this study was to investigate the underlying mechanisms by which FBL affects neuroinflammation. Methods RT-real-time PCR, Western blotting and immunofluorescence were used to assess the mRNA and protein expression of FBL in HT22 cells stimulated with LPS, as well as the cellular localization and fluorescence intensity of FBL. BAY-293 (a son of sevenless homolog 1 (SOS1) inhibitor), SR11302 (an activator protein-1 (AP-1) inhibitor) and KRA-533 (a KRAS agonist) were used to determine the molecular mechanisms underlying the effect of FBL. AP-1 was predicted to be the target protein of FBL by molecular docking analysis, and validation was performed with T-5224 (an AP-1 inhibitor). In addition, the downstream signaling pathways of FBL were identified by transcriptome sequencing and verified by RT-real-time PCR. Results LPS induced FBL mRNA and protein expression in HT22 cells. In-depth mechanistic studies revealed that when we inhibited c-Fos, AP-1, and SOS1, FBL expression decreased, whereas FBL expression increased when KRAS agonists were used. In addition, the transcript levels of inflammatory genes in the NF-kB signaling pathway (including CD14, MYD88, TNF, TRADD, and NFKB1) were elevated after the overexpression of FBL. Conclusion LPS induced the expression of FBL in HT22 cells through the RAS/MAPK signaling pathway, and FBL further activated the NF-kB signaling pathway, which promoted the expression of relevant inflammatory genes and the release of cytokines. The present study reveals the mechanism by which FBL promotes neuroinflammation and offers a potential target for the treatment of neuroinflammation.
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Affiliation(s)
- Zhuoyuan Zhang
- Biochemistry and Molecular Biology, College of Life Science, Northwest University, Xi’an, 710127, People’s Republic of China
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
| | - Dan Liu
- Biochemistry and Molecular Biology, College of Life Science, Northwest University, Xi’an, 710127, People’s Republic of China
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
| | - Rui Lv
- Biochemistry and Molecular Biology, College of Life Science, Northwest University, Xi’an, 710127, People’s Republic of China
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
| | - Haoyan Zhao
- Biochemistry and Molecular Biology, College of Life Science, Northwest University, Xi’an, 710127, People’s Republic of China
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
| | - Tianjing Li
- Biochemistry and Molecular Biology, College of Life Science, Northwest University, Xi’an, 710127, People’s Republic of China
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
| | - Yutao Huang
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
| | - Zhicheng Tian
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
| | - Xiangyu Gao
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
| | - Peng Luo
- Department of Neurosurgery, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
| | - Xin Li
- Department of Anesthesiology, Xijing Hospital, Fourth Military Medical University, Xi’an, 710032, People’s Republic of China
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Sun X, Gao C, Xu X, Li M, Zhao X, Wang Y, Wang Y, Zhang S, Yan Z, Liu X, Wu C. FBL promotes cancer cell resistance to DNA damage and BRCA1 transcription via YBX1. EMBO Rep 2023; 24:e56230. [PMID: 37489617 PMCID: PMC10481664 DOI: 10.15252/embr.202256230] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 06/27/2023] [Accepted: 07/04/2023] [Indexed: 07/26/2023] Open
Abstract
Fibrillarin (FBL) is a highly conserved nucleolar methyltransferase responsible for methylation of ribosomal RNA and proteins. Here, we reveal a role for FBL in DNA damage response and its impact on cancer proliferation and sensitivity to DNA-damaging agents. FBL is highly expressed in various cancers and correlates with poor survival outcomes in cancer patients. Knockdown of FBL sensitizes tumor cells and xenografts to DNA crosslinking agents, and leads to homologous recombination-mediated DNA repair defects. We identify Y-box-binding protein-1 (YBX1) as a key interacting partner of FBL, and FBL increases the nuclear accumulation of YBX1 in response to DNA damage. We show that FBL promotes the expression of BRCA1 by increasing the binding of YBX1 to the BRCA1 promoter. Our study sheds light on the regulatory mechanism of FBL in tumorigenesis and DNA damage response, providing potential therapeutic targets to overcome chemoresistance in cancer.
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Affiliation(s)
- Xiaorui Sun
- College of Life SciencesHebei UniversityBaodingChina
| | - Congwen Gao
- College of Life SciencesHebei UniversityBaodingChina
| | - Xin Xu
- College of Life SciencesHebei UniversityBaodingChina
| | - Mengyuan Li
- College of Life SciencesHebei UniversityBaodingChina
| | - Xinhua Zhao
- College of Life SciencesHebei UniversityBaodingChina
| | - Yanan Wang
- Affiliated Hospital of Hebei UniversityBaodingChina
| | - Yun Wang
- Affiliated Hospital of Hebei UniversityBaodingChina
| | - Shun Zhang
- Affiliated Hospital of Hebei UniversityBaodingChina
| | - Zhenzhen Yan
- College of Life SciencesHebei UniversityBaodingChina
| | - Xiuhua Liu
- College of Life SciencesHebei UniversityBaodingChina
| | - Chen Wu
- College of Life SciencesHebei UniversityBaodingChina
- The Key Laboratory of Zoological Systematics and ApplicationHebei UniversityBaodingChina
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Yi Y, Li Y, Chen K, Cao Q. Unveiling the non-canonical functions of EZH2 in prostate cancer. Oncotarget 2023; 14:127-128. [PMID: 36780304 PMCID: PMC9924823 DOI: 10.18632/oncotarget.28357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023] Open
Affiliation(s)
| | | | | | - Qi Cao
- Correspondence to:Qi Cao, Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA; Robert H. Lurie Comprehensive Cancer Center, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA email:
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Cavalcante LTDF, da Fonseca GC, Amado Leon LA, Salvio AL, Brustolini OJ, Gerber AL, Guimarães APDC, Marques CAB, Fernandes RA, Ramos Filho CHF, Kader RL, Pimentel Amaro M, da Costa Gonçalves JP, Vieira Alves-Leon S, Vasconcelos ATR. Buffy Coat Transcriptomic Analysis Reveals Alterations in Host Cell Protein Synthesis and Cell Cycle in Severe COVID-19 Patients. Int J Mol Sci 2022; 23:13588. [PMID: 36362378 PMCID: PMC9659271 DOI: 10.3390/ijms232113588] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 10/31/2022] [Accepted: 11/02/2022] [Indexed: 11/25/2023] Open
Abstract
Transcriptome studies have reported the dysregulation of cell cycle-related genes and the global inhibition of host mRNA translation in COVID-19 cases. However, the key genes and cellular mechanisms that are most affected by the severe outcome of this disease remain unclear. For this work, the RNA-seq approach was used to study the differential expression in buffy coat cells of two groups of people infected with SARS-CoV-2: (a) Mild, with mild symptoms; and (b) SARS (Severe Acute Respiratory Syndrome), who were admitted to the intensive care unit with the severe COVID-19 outcome. Transcriptomic analysis revealed 1009 up-regulated and 501 down-regulated genes in the SARS group, with 10% of both being composed of long non-coding RNA. Ribosome and cell cycle pathways were enriched among down-regulated genes. The most connected proteins among the differentially expressed genes involved transport dysregulation, proteasome degradation, interferon response, cytokinesis failure, and host translation inhibition. Furthermore, interactome analysis showed Fibrillarin to be one of the key genes affected by SARS-CoV-2. This protein interacts directly with the N protein and long non-coding RNAs affecting transcription, translation, and ribosomal processes. This work reveals a group of dysregulated processes, including translation and cell cycle, as key pathways altered in severe COVID-19 outcomes.
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Affiliation(s)
| | | | - Luciane Almeida Amado Leon
- Laboratório de Desenvolvimento Tecnológico em Virologia, Instituto Oswaldo Cruz/FIOCRUZ, Rio de Janeiro 21040-360, Brazil
| | - Andreza Lemos Salvio
- Laboratório de Neurociências Translacional, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro 20211-040, Brazil
| | - Otávio José Brustolini
- Laboratório de Bioinformática, Laboratório Nacional de Computação Científica, Petrópolis, Rio de Janeiro 25651-076, Brazil
| | - Alexandra Lehmkuhl Gerber
- Laboratório de Bioinformática, Laboratório Nacional de Computação Científica, Petrópolis, Rio de Janeiro 25651-076, Brazil
| | - Ana Paula de Campos Guimarães
- Laboratório de Bioinformática, Laboratório Nacional de Computação Científica, Petrópolis, Rio de Janeiro 25651-076, Brazil
| | - Carla Augusta Barreto Marques
- Laboratório de Neurociências Translacional, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro 20211-040, Brazil
- Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-617, Brazil
| | - Renan Amphilophio Fernandes
- Laboratório de Neurociências Translacional, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro 20211-040, Brazil
| | | | - Rafael Lopes Kader
- Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-617, Brazil
| | - Marisa Pimentel Amaro
- Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-617, Brazil
| | - João Paulo da Costa Gonçalves
- Laboratório de Neurociências Translacional, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro 20211-040, Brazil
- Yale New Haven Hospital, New Haven, CT 06510, USA
| | - Soniza Vieira Alves-Leon
- Laboratório de Neurociências Translacional, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro 20211-040, Brazil
- Hospital Universitário Clementino Fraga Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-617, Brazil
| | - Ana Tereza Ribeiro Vasconcelos
- Laboratório de Bioinformática, Laboratório Nacional de Computação Científica, Petrópolis, Rio de Janeiro 25651-076, Brazil
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