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Li W, Zhang Y, Cao Y, Zhao X, Xie J. Protective effects and regulatory mechanisms of Platycodin D against LPS-Induced inflammatory injury in BEAS-2B cells. Int Immunopharmacol 2024; 139:112782. [PMID: 39074416 DOI: 10.1016/j.intimp.2024.112782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Revised: 06/10/2024] [Accepted: 07/23/2024] [Indexed: 07/31/2024]
Abstract
Platycodin D (PLD), a major bioactive component of triterpene saponins found in Platycodon grandiflora, is renowned for its anti-inflammatory and antioxidant properties. This study aims to explore the protective effects and regulatory mechanisms of PLD in an LPS-induced inflammation injury model of BEAS-2B cells. Initially, PLD was identified from Platycodon grandiflora extracts utilizing UPLC-Q-TOF-MS/MS technology. The effects of PLD on the viability, morphology, ROS levels, and inflammatory factors of LPS-induced BEAS-2B cells were then investigated. The results showed that PLD significantly alleviated LPS-induced oxidative stress and inflammatory injury. Further analysis revealed that PLD positively influenced apoptosis levels, mitochondrial morphology, and related gene expression, indicating its potential to mitigate LPS-induced apoptosis and alleviate mitochondrial dysfunction. Using molecular docking technology, we predicted the binding sites of PLD with mitochondrial autophagy protein. Gene expression levels of autophagy-related proteins were measured to determine the impact of PLD on mitochondrial autophagy. Additionally, the study examined whether the mitochondrial autophagy agonists rapamycin (RAPA) could modulate the upregulation of inflammasome-related factors NLRP3 and Caspase-1 in LPS-induced BEAS-2B cells. This was done to evaluate the regulator mechanisms of PLD in pulmonary inflammatory injury. Our findings suggest that PLD's mechanism of action involves the regulation of mitochondrial autophagy, which in turn modulates inflammatory responses.
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Affiliation(s)
- Wei Li
- School of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin 300134, China; School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China
| | - Yanqing Zhang
- School of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin 300134, China.
| | - Yuxin Cao
- School of Biotechnology and Food Science, Tianjin University of Commerce, Tianjin 300134, China
| | - Xiaotong Zhao
- Department of Chemistry, Cleveland State University, Cleveland, OH 44115, USA
| | - Junbo Xie
- School of Chinese Materia Medica, Tianjin University of Traditional Chinese Medicine, Tianjin 301617, China.
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2
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Dong H, Hao Y, Gao P. Vitamin D level in COVID-19 patients has positive correlations with autophagy and negative correlations with disease severity. Front Pharmacol 2024; 15:1388348. [PMID: 38783947 PMCID: PMC11112027 DOI: 10.3389/fphar.2024.1388348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Accepted: 04/23/2024] [Indexed: 05/25/2024] Open
Abstract
Background and Objectives There is still incomplete understanding of the pathogenesis of COVID-19. Calcitriol, the main form of vitamin D in serum, regulates immune responses and increases resistance to pathogens, but the mechanism by which it protects against COVID-19 is uncertain. Autophagy has antiviral effects and helps to maintain homeostasis, but its specific role in COVID-19 is also uncertain. Both vitamin D and autophagy have important functions in the lung microenvironment. This study examined the relationship of serum vitamin D and autophagy-related proteins in patients with COVID-19 and evaluated their potential use as biomarkers. Methods Blood samples from COVID-19 patients at the Second Hospital of Jilin University were collected. The levels of vitamin D, autophagy-related proteins (Becline 1 [BECN1] and autophagy-related 7 [ATG7]), and inflammatory markers (TNF-α and IL-1β) were measured using enzyme-linked immunosorbent assays. Results We examined 25 patients with mild/moderate COVID-19 and 27 patients with severe/critical COVID-19. The group with severe/critical COVID-19 had more abnormalities in many laboratory indicators, including lower levels of autophagy markers (BECN1 and ATG7) and vitamin D, and higher levels of inflammatory markers (TNF-α and IL-1β). Partial correlation analysis showed that vitamin D had strong positive correlations with ATG7 (r = 0.819, p < 0.001) and BECN1 (r = 0.900, p < 0.001). Conclusion Our results demonstrated that the vitamin D level had significant negative correlations with COVID-19 severity and strong positive correlations with autophagy. These findings enhance our understanding of the pathogenesis of COVID-19, and provide a theoretical basis for clinical interventions that target autophagy and vitamin D.
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Affiliation(s)
| | | | - Peng Gao
- Department of Respiratory Medicine, The Second Hospital of Jilin University, Changchun, Jilin, China
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3
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Li S, Liu L, Luo G, Yuan Y, Hu D, Xiao F. The crosstalk between M1 macrophage polarization and energy metabolism disorder contributes to polystyrene nanoplastics-triggered testicular inflammation. Food Chem Toxicol 2023; 180:114002. [PMID: 37634612 DOI: 10.1016/j.fct.2023.114002] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 08/06/2023] [Accepted: 08/22/2023] [Indexed: 08/29/2023]
Abstract
Ubiquitous microplastics have become a threat to animal and human health, due to their potential toxicity, persistent nature and consequent bioaccumulation. Supporting evidence elucidates that polystyrene nanoplastics (PS-NPs) can destroy blood-testis barrier integrity, thus causing testicular hypoplasia and impairment of spermatogenesis. Nevertheless, how PS-NPs modulate macrophage polarization-energy metabolism crosstalk has not been fully investigated in testicular tissue. Here, we observed that polystyrene PS-NPs exposure contributes to severe vacuolization in the seminiferous tubules, accompanied by apoptosis of testicular tissue and infiltration of M1 macrophages. Meanwhile, we found that PS-NPs could trigger the M1 polarization phenotype, which activated ROS-macrophage migration inhibitory factor (MIF)/NF-κB signaling that in turn induced apoptosis of GC2 cells in the GC2-macrophage cell coculture model. Simultaneously, we confirmed that PS-NPs exposure increased 3-phospho-D-glycerate, phosphoenolpyruvate and lactate concentrations, accompanied by decreased pyruvate and adenosine triphosphate (ATP) production, likely due to downregulated pyruvate kinase M2 (PKM2) dimer expression. In conclusion, the mechanism of PS-NPs-induced testicular inflammation can be mediated by promoting the infiltration of M1 macrophages, thereby resulting in an ROS burst and subsequent induction of energy metabolism disorders. The current study will provide new insights into PS-NPs-induced male reproductive toxicity and highlight the context-specific roles of testicular macrophages.
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Affiliation(s)
- Siwen Li
- Xiangya School of Public Health, Central South University, Changsha, 410078, PR China
| | - Lemei Liu
- Xiangya School of Public Health, Central South University, Changsha, 410078, PR China
| | - Gang Luo
- Xiangya School of Public Health, Central South University, Changsha, 410078, PR China
| | - Yu Yuan
- Xiangya School of Public Health, Central South University, Changsha, 410078, PR China
| | - Die Hu
- Xiangya School of Public Health, Central South University, Changsha, 410078, PR China
| | - Fang Xiao
- Xiangya School of Public Health, Central South University, Changsha, 410078, PR China.
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Wang Y, Cheng B, Lin YJ, Wang R, Xuan J, Xu HM. Preliminary Study on the Effect and Molecular Mechanism of Tetrandrine in Alleviating Pulmonary Inflammation and Fibrosis Induced by Silicon Dioxide. TOXICS 2023; 11:765. [PMID: 37755775 PMCID: PMC10536946 DOI: 10.3390/toxics11090765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 09/02/2023] [Accepted: 09/06/2023] [Indexed: 09/28/2023]
Abstract
This study aims to explore the molecular mechanism of tetrandrine (Tet) in alleviating pulmonary inflammation and fibrosis induced by silica (SiO2) from the perspective of autophagy. C57BL/6J mice were selected as experimental animals, and SiO2 was exposed by intranasal instillation. Tet was intervened by oral gavage. The mice were euthanized on the 7th and 42nd day of SiO2 exposure, and lung tissues were collected for histopathological, molecular biological, immunological, and transmission electron microscopy analysis. The results showed that SiO2 exposure could lead to significant lung inflammation and fibrosis, while Tet could significantly reduce SiO2 exposure-induced lung inflammation and fibrosis. Molecular mechanism research indicated that, compared with SiO2 expose group, Tet intervention could significantly reduce the expression levels of inflammatory cytokines and fibrosis markers (TNF-α, IL-1β, MCP-1, TGF-β1, HYP, Col-I, and Fn), and regulate the expression of key molecules ATG7, microtubule-associated protein 1 light chain 3B (LC3B), and P62 in the autophagy pathway to improve the blocking of autophagic flux, promote the recovery of autophagic lysosomal system function, and inhibit apoptosis. In summary, Tet can alleviate silica-induced lung inflammation and fibrosis, which may be achieved by regulating the expression of key molecules in the autophagy process and associated apoptotic pathway.
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Affiliation(s)
- Yi Wang
- School of Public Health, Ningxia Medical University, Yinchuan 750004, China
- The Key Laboratory of Environmental Factors and Chronic Disease Control of Ningxia, Yinchuan 750004, China
| | - Bin Cheng
- School of Public Health, Ningxia Medical University, Yinchuan 750004, China
- The Key Laboratory of Environmental Factors and Chronic Disease Control of Ningxia, Yinchuan 750004, China
| | - Yu-Jia Lin
- School of Public Health, Ningxia Medical University, Yinchuan 750004, China
- The Key Laboratory of Environmental Factors and Chronic Disease Control of Ningxia, Yinchuan 750004, China
| | - Rui Wang
- School of Public Health, Ningxia Medical University, Yinchuan 750004, China
- The Key Laboratory of Environmental Factors and Chronic Disease Control of Ningxia, Yinchuan 750004, China
| | - Jie Xuan
- School of Public Health, Ningxia Medical University, Yinchuan 750004, China
- The Fifth People’s Hospital of the Ningxia Hui Autonomous Region, Shizuishan 753000, China
| | - Hai-Ming Xu
- School of Public Health, Ningxia Medical University, Yinchuan 750004, China
- The Key Laboratory of Environmental Factors and Chronic Disease Control of Ningxia, Yinchuan 750004, China
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Quach C, Helou DG, Li M, Hurrell BP, Howard E, Shafiei-Jahani P, Soroosh P, Ou JHJ, Razani B, Rehan V, Akbari O. Enhancing autophagy in CD11c + antigen-presenting cells as a therapeutic strategy for acute respiratory distress syndrome. Cell Rep 2023; 42:112990. [PMID: 37590140 PMCID: PMC10510741 DOI: 10.1016/j.celrep.2023.112990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 05/22/2023] [Accepted: 07/31/2023] [Indexed: 08/19/2023] Open
Abstract
Acute lung injury (ALI) and acute respiratory distress syndrome (ARDS) are severe clinical disorders that mainly develop from viral respiratory infections, sepsis, and chest injury. Antigen-presenting cells play a pivotal role in propagating uncontrolled inflammation and injury through the excess secretion of pro-inflammatory cytokines and recruitment of immune cells. Autophagy, a homeostatic process that involves the degradation of cellular components, is involved in many processes including lung inflammation. Here, we use a polyinosinic-polycytidylic acid (poly(I:C))-induced lung injury mouse model to mimic viral-induced ALI/ARDS and show that disruption of autophagy in macrophages exacerbates lung inflammation and injury, whereas autophagy induction attenuates this process. Therefore, induction of autophagy in macrophages can be a promising therapeutic strategy in ALI/ARDS.
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Affiliation(s)
- Christine Quach
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Doumet Georges Helou
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Meng Li
- USC Libraries Bioinformatics Service, University of Southern California, Los Angeles, CA 90089, USA
| | - Benjamin Pierre Hurrell
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Emily Howard
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Pedram Shafiei-Jahani
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Pejman Soroosh
- Janssen Research and Development, San Diego, CA 92121, USA
| | - Jing-Hsiung James Ou
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA
| | - Babak Razani
- University of Pittsburgh School of Medicine and UPMC, Pittsburgh, PA 15261, USA; Pittsburgh VA Medical Center, Pittsburgh, PA 15240, USA
| | - Virender Rehan
- Division of Neonatology, Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center, Torrance, CA 90502, USA
| | - Omid Akbari
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA 90033, USA.
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Zhu W, Zhu Y, Zhang S, Zhang W, Si Z, Bai Y, Wu Y, Fu Y, Zhang Y, Zhang L, Zhang X, Zhu X. 1,25-Dihydroxyvitamin D regulates macrophage activation through FBP1/PKR and ameliorates arthritis in TNF-transgenic mice. J Steroid Biochem Mol Biol 2023; 228:106251. [PMID: 36646150 DOI: 10.1016/j.jsbmb.2023.106251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 12/22/2022] [Accepted: 01/12/2023] [Indexed: 01/15/2023]
Abstract
1,25-Dihydroxyvitamin D (1,25(OH)2D3) has immunomodulatory activity and its deficiency correlates with rheumatoid arthritis (RA) incidence. Whether 1,25(OH)2D3 modulates macrophage activation or protects against RA remains unclear. We demonstrate that 1,25(OH)2D3 suppresses M1 macrophage polarization and CD80, IL-6, CXCL10, IFIT1, IFI44, and double-stranded RNA-dependent protein kinase R (PKR) expression in the macrophages of RA patients. In phorbol 12-myristate 13-acetate-induced THP-1 cells, 1,25(OH)2D3 upregulates fructose-1,6-bisphosphatase 1 (FBP1) expression through direct promoter interaction. FBP1 interacts with PKR and promotes PKR ubiquitination degradation. SiR-FBP1 transfection impairs 1,25(OH)2D3 action and suppresses IL-6, CXCL10, IFIT1, IFI27, and IFI44 expression in macrophages, whereas siR-PKR transfection impairs siR-FBP1 activity in 1,25(OH)2D3-treated macrophages. 1,25(OH)2D3 treatment ameliorates the clinical signs of arthritis in tumor necrosis factor-transgenic mice, inhibits M1 polarization and marker expression, and promotes FBP1 expression in mononuclear cells isolated from swollen joints; thus, 1,25(OH)2D3 suppresses M1 macrophage activation through FBP1/PKR and ameliorates arthritis by restoring the macrophage subtype.
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Affiliation(s)
- Wei Zhu
- Department of Immunology, Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China.
| | - Ye Zhu
- Department of Obstetrics and Gynecology, Peking University People's Hospital, Beijing 100044, China
| | - Shujun Zhang
- Department of Immunology, Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China; Department of Rehabilitation and Nursing, Heilongjiang Vocational Collage of Winter Sports, Harbin, Heilongjiang, 150028, China
| | - Weiting Zhang
- Department of Rheumatology, Hongqi Hospital of Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China
| | - Zihou Si
- Department of Immunology, Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China
| | - Yuxi Bai
- Department of Immunology, Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China
| | - Ying Wu
- Department of Pathology, Hongqi hospital of Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China
| | - Yao Fu
- Department of Pathology, Hongqi hospital of Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China
| | - Yang Zhang
- Department of Immunology, Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China
| | - Luyao Zhang
- Department of Immunology, Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China
| | - Xiaomin Zhang
- Department of Rheumatology, Hongqi Hospital of Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China
| | - Xiaodong Zhu
- Department of Immunology, Mudanjiang Medical University, Mudanjiang, Heilongjiang, 157011, China.
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7
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Wang T, Ou L, Li X, Zhang P, Miao Q, Niu R, Chen Y. Inhibition of Galectin-3 attenuates silica particles-induced silicosis via regulating the GSK-3β/β-catenin signal pathway-mediated epithelial-mesenchymal transition. Chem Biol Interact 2022; 368:110218. [DOI: 10.1016/j.cbi.2022.110218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 09/28/2022] [Accepted: 10/06/2022] [Indexed: 11/28/2022]
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8
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Liu C, Xiao K, Xie L. Progress in preclinical studies of macrophage autophagy in the regulation of ALI/ARDS. Front Immunol 2022; 13:922702. [PMID: 36059534 PMCID: PMC9433910 DOI: 10.3389/fimmu.2022.922702] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 08/03/2022] [Indexed: 12/12/2022] Open
Abstract
Acute lung injury (ALI)/acute respiratory distress syndrome (ARDS) is a critical clinical syndrome with high morbidity and mortality that poses a major challenge in critical care medicine. The development of ALI/ARDS involves excessive inflammatory response, and macrophage autophagy plays an important role in regulating the inflammatory response in ALI/ARDS. In this paper, we review the effects of autophagy in regulating macrophage function, discuss the roles of macrophage autophagy in ALI/ARDS, and highlight drugs and other interventions that can modulate macrophage autophagy in ALI/ARDS to improve the understanding of the mechanism of macrophage autophagy in ALI/ARDS and provide new ideas and further research directions for the treatment of ALI/ARDS.
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Affiliation(s)
- Chang Liu
- School of Medicine, Nankai University, Tianjin, China
- College of Pulmonary & Critical Care Medicine, 8th Medical Center, Chinese PLA General Hospital, Beijing, China
- Medical School of Chinese PLA, Beijing, China
| | - Kun Xiao
- College of Pulmonary & Critical Care Medicine, 8th Medical Center, Chinese PLA General Hospital, Beijing, China
- Medical School of Chinese PLA, Beijing, China
- *Correspondence: Kun Xiao, ; Lixin Xie,
| | - Lixin Xie
- School of Medicine, Nankai University, Tianjin, China
- College of Pulmonary & Critical Care Medicine, 8th Medical Center, Chinese PLA General Hospital, Beijing, China
- Medical School of Chinese PLA, Beijing, China
- *Correspondence: Kun Xiao, ; Lixin Xie,
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Chen B, Wu L, Tang X, Wang T, Wang S, Yu H, Wan G, Xie M, Zhang R, Xiao H, Deng W. Quercetin Inhibits Tumorigenesis of Colorectal Cancer Through Downregulation of hsa_circ_0006990. Front Pharmacol 2022; 13:874696. [PMID: 35662705 PMCID: PMC9158466 DOI: 10.3389/fphar.2022.874696] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Accepted: 04/07/2022] [Indexed: 11/17/2022] Open
Abstract
Quercetin can significantly inhibit the progression of colorectal cancer (CRC). However, its specific mechanism remains largely unclear. In this study, we aimed to explore the correlation among quercetin, tumour-associated macrophages (TAMs) and circular RNAs (circRNAs) in the progression of CRC and to present a novel strategy for the treatment of CRC. In this study, we revealed that quercetin could suppress the autophagy of M2-TAMs and induced their differentiation into M1-TAMs, by which quercetin significantly reversed the inhibition of M2-TAMS on CRC cell apoptosis and the promotion of M2-TAMS on CRC cell proliferation. Moreover, quercetin could promote the expression of downregulated hsa_circ_0006990 in CRC cells co-cultured with M2-TAMs, and the overexpression of hsa_circ_0006990 significantly reversed the anti-tumour effect of quercetin on CRC. Furthermore, we found quercetin can notably suppress the progression of CRC via mediation of the hsa_circ_0006990/miR-132-3p/MUC13 axis. In conclusion, our results suggested that quercetin inhibits the tumorigenesis of CRC via inhibiting the polarisation of M2 macrophages and downregulating hsa_circ_0006990. Our study provides useful insights for those exploring new methods of treating CRC.
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Affiliation(s)
- Bin Chen
- Department of Oncology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Linguangjin Wu
- Department of Oncology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Xiaoxia Tang
- Department of Oncology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Ting Wang
- Department of Oncology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Shuyun Wang
- Department of Oncology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Hongjie Yu
- Department of Oncology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Guangsheng Wan
- Department of Oncology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Manli Xie
- Department of Oncology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Ruijuan Zhang
- Department of Traditional Chinese Medicine, Putuo People's Hospital, Tongji University, Shanghai, China
| | - Haijuan Xiao
- Department of Oncology, Affiliated Hospital of Shaanxi University of Chinese Medicine, Xianyang, China
| | - Wanli Deng
- Department of Oncology, Putuo Hospital, Shanghai University of Traditional Chinese Medicine, Shanghai, China
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