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Zhong T, Chen S, Deng K, Guan J, Zhang J, Lu F, Shichen M, Lv R, Liu Z, Liu Y, Chang P, Liu Z. Magnesium alleviates extracellular histone-induced apoptosis and defective bacterial phagocytosis in macrophages by regulating intracellular calcium signal. Int Immunopharmacol 2024; 132:111870. [PMID: 38547771 DOI: 10.1016/j.intimp.2024.111870] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 02/18/2024] [Accepted: 03/12/2024] [Indexed: 05/01/2024]
Abstract
Extracellular histones have been determined as important mediators of sepsis, which induce excessive inflammatory responses in macrophages and impair innate immunity. Magnesium (Mg2+), one of the essential nutrients of the human body, contributes to the proper regulation of immune function. However, no reports indicate whether extracellular histones affect survival and bacterial phagocytosis in macrophages and whether Mg2+ is protective against histone-induced macrophage damage. Our clinical data revealed a negative correlation between circulating histone and monocyte levels in septic patients, and in vitro experiments confirmed that histones induced mitochondria-associated apoptosis and defective bacterial phagocytosis in macrophages. Interestingly, our clinical data also indicated an association between lower serum Mg2+ levels and reduced monocyte levels in septic patients. Moreover, in vitro experiments demonstrated that Mg2+ attenuated histone-induced apoptosis and defective bacterial phagocytosis in macrophages through the PLC/IP3R/STIM-mediated calcium signaling pathway. Importantly, further animal experiments proved that Mg2+ significantly improved survival and attenuated histone-mediated lung injury and macrophage damage in histone-stimulated mice. Additionally, in a cecal ligation and puncture (CLP) + histone-induced injury mouse model, Mg2+ inhibited histone-mediated apoptosis and defective phagocytosis in macrophages and further reduced bacterial load. Overall, these results suggest that Mg2+ supplementation may be a promising treatment for extracellular histone-mediated macrophage damage in sepsis.
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Affiliation(s)
- Tao Zhong
- Department of Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Sainan Chen
- Department of Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Ke Deng
- Department of Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Jianbin Guan
- Department of Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Jiaqi Zhang
- Department of Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Furong Lu
- Department of Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Maoyou Shichen
- Department of Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Ronggui Lv
- Department of Intensive Care Unit, Shenzhen Hospital, Southern Medical University, Shenzhen, Guangdong, China
| | - Zhifeng Liu
- Department of Medicine Intensive Care Units, General Hospital of Southern Theatre Command of PLA, Guangzhou, Guangdong, China.
| | - Yong Liu
- Department of Intensive Care Unit, Shenzhen Hospital, Southern Medical University, Shenzhen, Guangdong, China.
| | - Ping Chang
- Department of Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China.
| | - Zhanguo Liu
- Department of Critical Care Medicine, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong, China.
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Guo ZL, Zhou J, Lin XJ, Yuan Q, Dong YL, Liu QB, Wang T. Regulation of the AGEs-induced inflammatory response in human periodontal ligament cells via the AMPK/NF-κB/ NLRP3 signaling pathway. Exp Cell Res 2024; 437:113999. [PMID: 38494067 DOI: 10.1016/j.yexcr.2024.113999] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/04/2024] [Accepted: 03/10/2024] [Indexed: 03/19/2024]
Abstract
The heightened prevalence and accelerated progression of periodontitis in individuals with diabetes is primarily attributed to inflammatory responses in human periodontal ligament cells (HPDLCs). This study is aimed at delineating the regulatory mechanism of nucleotide-binding oligomerization domain-like receptors (NLRs) in mediating inflammation incited by muramyl dipeptide (MDP) in HPDLCs, under the influence of advanced glycation end products (AGEs), metabolic by-products associated with diabetes. We performed RNA-seq in HPDLCs induced by AGEs treatment and delineated activation markers for the receptor of AGEs (RAGE). It showed that advanced glycation end products modulate inflammatory responses in HPDLCs by activating NLRP1 and NLRP3 inflammasomes, which are further regulated through the NF-κB signaling pathway. Furthermore, AGEs synergize with NOD2, NLRP1, and NLRP3 inflammasomes to augment MDP-induced inflammation significantly.
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Affiliation(s)
- Zhu-Ling Guo
- School of Dentistry, Hainan Medical University, Haikou, China; Department of Health Management Center, The First Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Jie Zhou
- School of Dentistry, Hainan Medical University, Haikou, China
| | - Xue-Jing Lin
- School of Dentistry, Hainan Medical University, Haikou, China
| | - Qing Yuan
- School of Dentistry, Hainan Medical University, Haikou, China
| | - Yu-Lei Dong
- School of Dentistry, Hainan Medical University, Haikou, China
| | - Qi-Bing Liu
- Engineering Research Center of Tropical Medicine Innovation and Transformation, Ministry of Education, The First Affiliated Hospital, Haikou, 571199, China; Department of Pharmacology, School of Basic Medicine and Life Sciences, Hainan Medical University, Haikou, 571199, China.
| | - Tao Wang
- Dental Medical Center, Hainan Affiliated Hospital of Hainan Medical University (Hainan General Hospital),19 Xiuhua Road, Haikou, 570311, Hainan, China.
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Yang Y, Yao Z, Zhang J, Shao W, Li B, Wu H, Tang W, Zhang J. Inhibiting Peptidoglycan Hydrolase Alleviates MRSA Pneumonia Through Autolysin-Mediated MDP-NOD2 Pathway. Infect Drug Resist 2024; 17:1231-1242. [PMID: 38560705 PMCID: PMC10981453 DOI: 10.2147/idr.s455339] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2023] [Accepted: 03/15/2024] [Indexed: 04/04/2024] Open
Abstract
Background Methicillin-resistant Staphylococcus aureus (MRSA) is a cause of staph infection that is difficult to treat because of resistance to some antibiotics. A recent study indicated that diarylurea ZJ-2 is a novel antibacterial agent against multi-drug resistant Enterococcus faecium. In this work, we refined the bactericidal mechanism of ZJ-2 as a peptidoglycan (PG) hydrolase by affecting AtlA-mediated PG homeostasis. Methods A wild-type strain (WT) and a mutant strain (ΔatlA) were used to investigate the effects of ZJ-2 on the cell wall, PG, and autolysin regulatory system by antimicrobial susceptibility testing, hemolytic toxin assay, microanalysis, autolysis assay, qRT-PCR, ELISA and mouse model of pneumonia. Results The results revealed that ZJ-2 down-regulated the expression of genes related to peptidoglycan hydrolase (PGH) (sprX, walR, atlA, and lytM), and reduced the levels of PG, muramyl dipeptide (MDP), cytokines, and hemolytic toxin, while ΔatlA interfered with the genes regulation and PG homeostasis. In the mouse MRSA pneumonia model, the same trend was observed in the nucleotide oligomerization domain protein 2 (NOD2) and relative proinflammatory factors. Conclusion ZJ-2 may act as a novel inhibitor of PG hydrolyse, disrupting autolysin-mediated PG homeostasis, and reducing inflammation by down-regulating the MDP-NOD2 pathway.
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Affiliation(s)
- Yang Yang
- School of Medicine, Anhui University of Science and Technology, Huainan, People’s Republic of China
- Anhui Province Key Laboratory of Occupational Health, Anhui No.2 Provincial People’s Hospital, Hefei, People’s Republic of China
| | - Zongze Yao
- School of Medicine, Anhui University of Science and Technology, Huainan, People’s Republic of China
| | - Jiazhen Zhang
- School of Medicine, Anhui University of Science and Technology, Huainan, People’s Republic of China
| | - Wei Shao
- School of Pharmacy, Anhui Medical University, Hefei, People’s Republic of China
| | - Bo Li
- Anhui Province Key Laboratory of Occupational Health, Anhui No.2 Provincial People’s Hospital, Hefei, People’s Republic of China
| | - Huihui Wu
- Anhui Province Key Laboratory of Occupational Health, Anhui No.2 Provincial People’s Hospital, Hefei, People’s Republic of China
| | - Wenjian Tang
- School of Pharmacy, Anhui Medical University, Hefei, People’s Republic of China
| | - Jing Zhang
- Anhui Province Key Laboratory of Occupational Health, Anhui No.2 Provincial People’s Hospital, Hefei, People’s Republic of China
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Tsoneva DK, Ivanov MN, Vinciguerra M. Liquid Liver Biopsy for Disease Diagnosis and Prognosis. J Clin Transl Hepatol 2023; 11:1520-1541. [PMID: 38161500 PMCID: PMC10752811 DOI: 10.14218/jcth.2023.00040] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 05/24/2023] [Accepted: 06/07/2023] [Indexed: 01/03/2024] Open
Abstract
Liver diseases are a major burden worldwide, the scope of which is expected to further grow in the upcoming years. Clinically relevant liver dysfunction-related blood markers such as alanine aminotransferase and aspartate aminotransferase have limited accuracy. Nowadays, liver biopsy remains the gold standard for several liver-related pathologies, posing a risk of complication due to its invasive nature. Liquid biopsy is a minimally invasive approach, which has shown substantial potential in the diagnosis, prognosis, and monitoring of liver diseases by detecting disease-associated particles such as proteins and RNA molecules in biological fluids. Histones are the core components of the nucleosomes, regulating essential cellular processes, including gene expression and DNA repair. Following cell death or activation of immune cells, histones are released in the extracellular space and can be detected in circulation. Histones are stable in circulation, have a long half-life, and retain their post-translational modifications. Here, we provide an overview of the current research on histone-mediated liquid biopsy methods for liver diseases, with a focus on the most common detection methods.
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Affiliation(s)
- Desislava K. Tsoneva
- Department of Medical Genetics, Medical University of Varna, Varna, Bulgaria
- Department of Stem Cell Biology and Transplantology, Research Institute, Medical University of Varna, Varna, Bulgaria
| | - Martin N. Ivanov
- Department of Stem Cell Biology and Transplantology, Research Institute, Medical University of Varna, Varna, Bulgaria
- Department of Anatomy and Cell Biology, Research Institute, Medical University of Varna, Varna, Bulgaria
| | - Manlio Vinciguerra
- Department of Stem Cell Biology and Transplantology, Research Institute, Medical University of Varna, Varna, Bulgaria
- Faculty of Health, Liverpool John Moores University, Liverpool, United Kingdom
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Wu X, Zhang X, Liu P, Wang Y. Involvement of Ataxin-3 (ATXN3) in the malignant progression of pancreatic cancer via deubiquitinating HDAC6. Pancreatology 2023; 23:630-641. [PMID: 37460341 DOI: 10.1016/j.pan.2023.06.011] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 06/15/2023] [Accepted: 06/19/2023] [Indexed: 09/11/2023]
Abstract
BACKGROUND Pancreatic cancer is a common digestive system cancer and one of the most lethal malignancies worldwide. Ataxin-3 (ATXN3) protein is a deubiquitinating enzyme implicated in the occurrence of diverse human cancers. The potential role of ATXN3 in pancreatic cancer still remains unclear. METHODS ATXN3 was screened from differentially-upregulated genes of GSE71989, GSE27890 and GSE40098 datasets. The mRNA and protein levels of ATXN3 was evaluated in pancreatic cancer samples and cell lines. Through the gain- and loss-of-function experiments, the effects of ATXN3 on cell proliferation, migration and invasion were evaluated using cell counting kit-8 (CCK-8), 5-ethynyl-2'-deoxyuridine (EdU) staining, wound healing and Transwell assays. Subsequently, the interaction between ATXN3 and HDAC6 was confirmed using double immunofluorescence staining, co-immunoprecipitation (co-IP) and proximity ligation assay (PLA). The underlying mechanism of ATXN3 was determined by knockdown of HDAC6 in ATXN3-upregulated pancreatic cancer cells. The function of ATXN3 in vivo was verified through xenograft assay. RESULTS High expression of ATXN3 was found in pancreatic cancer tissues. Increased ATXN3 expression dramatically promoted cell proliferation, migration, and invasion. The malignant phenotypes were suppressed in ATXN3-silenced pancreatic cancer cells. ATXN3 was proved to interact with HDAC6 and regulate its degradation through deubiquitination. Downregulation of HDAC6 inhibited ATXN3-induced development of pancreatic cancer cells through regulating the expression of PCNA, vimentin and E-cadherin. ATXN3 facilitated tumor growth of pancreatic cancer and increased HDAC6 expression in vivo. CONCLUSIONS This study confirmed that ATXN3 facilitated malignant phenotypes of pancreatic cancer via reducing the ubiquitination of HDAC6.
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Affiliation(s)
- Xin Wu
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning, PR China
| | - Xin Zhang
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning, PR China
| | - Peng Liu
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning, PR China
| | - Yao Wang
- Department of Ultrasound, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning, PR China.
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Zhang YQ, Shi CX, Zhang DM, Zhang LY, Wang LW, Gong ZJ. Sulforaphane, an NRF2 agonist, alleviates ferroptosis in acute liver failure by regulating HDAC6 activity. J Integr Med 2023; 21:464-473. [PMID: 37620223 DOI: 10.1016/j.joim.2023.08.002] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 06/01/2023] [Indexed: 08/26/2023]
Abstract
OBJECTIVE Acute liver failure (ALF) is characterized by severe liver dysfunction, rapid progression and high mortality and is difficult to treat. Studies have found that sulforaphane (SFN), a nuclear factor E2-related factor 2 (NRF2) agonist, has anti-inflammatory, antioxidant and anticancer effects, and has certain protective effects on neurodegenerative diseases, cancer and liver fibrosis. This paper aimed to explore the protective effect of SFN in ALF and it possible mechanisms of action. METHODS Lipopolysaccharide and D-galactosamine were used to induce liver injury in vitro and in vivo. NRF2 agonist SFN and histone deacetylase 6 (HDAC6) inhibitor ACY1215 were used to observe the protective effect and possible mechanisms of SFN in ALF, respectively. Cell viability, lactate dehydrogenase (LDH), Fe2+, glutathione (GSH) and malondialdehyde (MDA) were detected. The expression of HDAC6, NRF2, glutathione peroxidase 4 (GPX4), acyl-CoA synthetase long-chain family member 4 (ACSL4) and solute carrier family 7 member 11 (SLC7A11) were detected by Western blotting and immunofluorescence. RESULTS Our results show that NRF2 was activated by SFN. LDH, Fe2+, MDA and ACSL4 were downregulated, while GSH, GPX4 and SLC7A11 were upregulated by SFN in vitro and in vivo, indicating the inhibitory effect of SFN on ferroptosis. Additionally, HDAC6 expression was decreased in the SFN group, indicating that SFN could downregulate the expression of HDAC6 in ALF. After using the HDAC6 inhibitor, ACY1215, SFN further reduced HDAC6 expression and inhibited ferroptosis, indicating that SFN may inhibit ferroptosis by regulating HDAC6 activity. CONCLUSION SFN has a protective effect on ALF, and the mechanism may include reduction of ferroptosis through the regulation of HDAC6. Please cite this article as: Zhang YQ, Shi CX, Zhang DM, Zhang LY, Wang LW, Gong ZJ. Sulforaphane, an NRF2 agonist, alleviates ferroptosis in acute liver failure by regulating HDAC6 activity. J Integr Med. 2023; 21(5): 464-473.
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Affiliation(s)
- Yan-Qiong Zhang
- Department of Infectious Diseases, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, China
| | - Chun-Xia Shi
- Department of Infectious Diseases, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, China
| | - Dan-Mei Zhang
- Department of Infectious Diseases, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, China
| | - Lu-Yi Zhang
- Department of Infectious Diseases, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, China
| | - Lu-Wen Wang
- Department of Infectious Diseases, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, China
| | - Zuo-Jiong Gong
- Department of Infectious Diseases, Renmin Hospital of Wuhan University, Wuhan 430060, Hubei Province, China.
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Ji HZ, Chen L, Ren M, Li S, Liu TY, Chen HJ, Yu HH, Sun Y. CXCL8 Promotes Endothelial-to-Mesenchymal Transition of Endothelial Cells and Protects Cells from Erastin-Induced Ferroptosis via CXCR2-Mediated Activation of the NF-κB Signaling Pathway. Pharmaceuticals (Basel) 2023; 16:1210. [PMID: 37765018 PMCID: PMC10536478 DOI: 10.3390/ph16091210] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/07/2023] [Accepted: 08/18/2023] [Indexed: 09/29/2023] Open
Abstract
CXCL8-CXCR1/CXCR2 signaling pathways might form complex crosstalk among different cell types within the ovarian tumor microenvironment, thereby modulating the behaviors of different cells. This study aimed to investigate the expression pattern of CXCL8 in the ovarian tumor microenvironment and its impact on both endothelial-to-mesenchymal transition (EndMT) and ferroptosis of endothelial cells. The human monocytic cell line THP-1 and the human umbilical vein endothelial cell line PUMC-HUVEC-T1 were used to conduct in vitro studies. Erastin was used to induce ferroptosis. Results showed that tumor-associated macrophages are the major source of CXCL8 in the tumor microenvironment. CXCL8 treatment promoted the nucleus entrance of NF-κB p65 and p65 phosphorylation via CXCR2 in endothelial cells, suggesting activated NF-κB signaling. Via the NF-κB signaling pathway, CXCL8 enhanced TGF-β1-induced EndMT of PUMC-HUVEC-T1 cells and elevated their expression of SLC7A11 and GPX4. These trends were drastically weakened in groups with CXCR2 knockdown or SB225002 treatment. TPCA-1 reversed CXCL8-induced upregulation of SLC7A11 and GPX4. CXCL8 protected endothelial cells from erastin-induced ferroptosis. However, these protective effects were largely canceled when CXCR2 was knocked down. In summary, CXCL8 can activate the NF-κB signaling pathway in endothelial cells in a CXCR2-dependent manner. The CXCL8-CXCR2/NF-κB axis can enhance EndMT and activate SLC7A11 and GPX4 expression, protecting endothelial cells from ferroptosis.
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Affiliation(s)
- Hai-zhou Ji
- Department of Gynecology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou 350014, China; (H.-z.J.); (L.C.); (S.L.); (T.-y.L.); (H.-j.C.); (H.-h.Y.)
| | - Li Chen
- Department of Gynecology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou 350014, China; (H.-z.J.); (L.C.); (S.L.); (T.-y.L.); (H.-j.C.); (H.-h.Y.)
| | - Mi Ren
- Department of Oncological Nursing, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou 350014, China;
| | - Sang Li
- Department of Gynecology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou 350014, China; (H.-z.J.); (L.C.); (S.L.); (T.-y.L.); (H.-j.C.); (H.-h.Y.)
| | - Tong-yu Liu
- Department of Gynecology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou 350014, China; (H.-z.J.); (L.C.); (S.L.); (T.-y.L.); (H.-j.C.); (H.-h.Y.)
| | - Hong-ju Chen
- Department of Gynecology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou 350014, China; (H.-z.J.); (L.C.); (S.L.); (T.-y.L.); (H.-j.C.); (H.-h.Y.)
| | - Hui-hui Yu
- Department of Gynecology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou 350014, China; (H.-z.J.); (L.C.); (S.L.); (T.-y.L.); (H.-j.C.); (H.-h.Y.)
| | - Yang Sun
- Department of Gynecology, Clinical Oncology School of Fujian Medical University, Fujian Cancer Hospital, Fuzhou 350014, China; (H.-z.J.); (L.C.); (S.L.); (T.-y.L.); (H.-j.C.); (H.-h.Y.)
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Liu S, Zhang HL, Li J, Ye ZP, Du T, Li LC, Guo YQ, Yang D, Li ZL, Cao JH, Hu BX, Chen YH, Feng GK, Li ZM, Deng R, Huang JJ, Zhu XF. Tubastatin A potently inhibits GPX4 activity to potentiate cancer radiotherapy through boosting ferroptosis. Redox Biol 2023; 62:102677. [PMID: 36989572 PMCID: PMC10074938 DOI: 10.1016/j.redox.2023.102677] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 02/28/2023] [Accepted: 03/14/2023] [Indexed: 03/19/2023] Open
Abstract
Ferroptosis, an iron-dependent lipid peroxidation-driven programmed cell death, is closely related to cancer therapy. The development of druggable ferroptosis inducers and their rational application in cancer therapy are critical. Here, we identified Tubastatin A, an HDAC6 inhibitor as a novel druggable ferroptosis inducer through large-scale drug screening. Tubastatin A directly bonded to GPX4 and inhibited GPX4 enzymatic activity through biotin-linked Tubastatin A putdown and LC/MS analysis, which is independent of its inhibition of HDAC6. In addition, our results showed that radiotherapy not only activated Nrf2-mediated GPX4 transcription but also inhibited lysosome-mediated GPX4 degradation, subsequently inducing ferroptosis tolerance and radioresistance in cancer cells. Tubastatin A overcame ferroptosis resistance and radioresistance of cancer cells by inhibiting GPX4 enzymatic activity. More importantly, Tubastatin A has excellent bioavailability, as demonstrated by its ability to significantly promote radiotherapy-induced lipid peroxidation and tumour suppression in a mouse xenograft model. Our findings identify a novel druggable ferroptosis inducer, Tubastatin A, which enhances radiotherapy-mediated antitumor effects. This work provides a compelling rationale for the clinical evaluation of Tubastatin A, especially in combination with radiotherapy.
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