1
|
Lian Z, Ke G, Zhang H, Dou C, Chen X, Li B, Zhang F, Wen S, Wu Q, Xia Y, Jiang N, Li Z, Li S, Zhao X, Ma J, Lin T, Wen F, Xu L, Li Z, Liang H, Dong W, Chen Y, Li R, Ye Z, Wang W, Liang X, Shi W, Zhang L, Liu S. GAP-43 ameliorates Podocyte injury by decreasing nuclear NFATc1 expression. Biochem Biophys Rep 2021; 28:101145. [PMID: 34746448 PMCID: PMC8551842 DOI: 10.1016/j.bbrep.2021.101145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 09/27/2021] [Accepted: 09/28/2021] [Indexed: 10/25/2022] Open
Abstract
Podocyte injury is sufficient to cause glomerulosclerosis and proteinuria, eventually leading to kidney failure. Previous studies found that podocytes and neurons had similar biological characteristics. Growth-associated protein-43 (GAP-43) is a growth cone protein in neurons, and a marker of axonal and synaptic growth. However, it is not known whether GAP-43 is expressed in podocytes. Compared with normal glomerular podocytes, GAP-43 was significantly reduced in patients with glomerular diseases. GAP-43 also significantly reduced in lipopolysaccharide (LPS)-treated podocytes. We found that the decreased expression of nephrin, the cell marker of the podocyte, was significantly recovered with GAP-43 overexpression. In contrast, the migration ability in LPS-treated podocyte was reduction after GAP-43 overexpressing. Moreover, overexpression of GAP-43 attenuated podocyte apoptosis by up-regulating the ratio of Bcl-2/Bax with LPS treatment. Finally, Plaue and Rcan1 which are downstream target gene of NFATc1 decreased with overexpression of GAP-43 podocytes. We concluded that GAP-43 attenuated podocyte injury by inhibiting calcineurin/NFATc1 signaling. The findings may provide a promising treatment for podocyte injury-related diseases.
Collapse
Affiliation(s)
- Zhiwen Lian
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,Department of Nephrology, Foshan First People's Hospital, Foshan, China
| | - Guibao Ke
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,Department of Nephrology, The First Affiliated Hospital of Guangzhou Medical University, Guangdong, China
| | - Hong Zhang
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Caoshuai Dou
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Xueqin Chen
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,School of Medicine, South China University of Technology, Guangzhou, Guangdong, China
| | - Bohou Li
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, 510080, China
| | - Fengxia Zhang
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, 510080, China
| | - Shichun Wen
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,School of Medicine, South China University of Technology, Guangzhou, Guangdong, China
| | - Qiong Wu
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, 510080, China
| | - Yubin Xia
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, 510080, China
| | - Nan Jiang
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, 510080, China
| | - Zhuo Li
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Sijia Li
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Xingchen Zhao
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Jianchao Ma
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Ting Lin
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Feng Wen
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Lixia Xu
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Zhilian Li
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Huabang Liang
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Wei Dong
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Yuanhan Chen
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Ruizhao Li
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Zhiming Ye
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Wenjian Wang
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Xinling Liang
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Wei Shi
- Department of Nephrology, The People's Hospital of Gaozhou, Maoming, Guangdong, China
| | - Li Zhang
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China
| | - Shuangxin Liu
- Department of Nephrology, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Guangzhou, 510080, China.,School of Medicine, South China University of Technology, Guangzhou, Guangdong, China.,The Second School of Clinical Medicine, Southern Medical University, Guangzhou, 510080, China
| |
Collapse
|
2
|
Zhu L, Yuan Q, Zeng Z, Zhou R, Luo R, Zhang J, Tsang CK, Bi W. Rifampicin Suppresses Amyloid-β Accumulation Through Enhancing Autophagy in the Hippocampus of a Lipopolysaccharide-Induced Mouse Model of Cognitive Decline. J Alzheimers Dis 2021; 79:1171-1184. [PMID: 33386800 DOI: 10.3233/jad-200690] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND Alzheimer's disease (AD) is characterized by amyloid-β (Aβ) deposition. The metabolism of Aβ is critically affected by autophagy. Although rifampicin is known to mediate neuroinflammation, the underlying mechanism by which rifampicin regulates the cognitive sequelae remains unknown. OBJECTIVE Based on our previous findings that rifampicin possesses neuroprotective effects on improving cognitive function after neuroinflammation, we aimed to examine in this study whether rifampicin can inhibit Aβ accumulation by enhancing autophagy in a mouse model of lipopolysaccharide (LPS)-induced cognitive impairment. METHODS Adult C57BL/6 mice were intraperitoneally injected with rifampicin, chloroquine, and/or LPS every day for 7 days. Pathological and biochemical assays and behavioral tests were performed to determine the therapeutic effect and mechanism of rifampicin on the hippocampus of LPS-induced mice. RESULTS We found that rifampicin ameliorated cognitive impairments in the LPS-induced mice. In addition, rifampicin attenuated the inhibition of autophagosome formation, suppressed the accumulation of Aβ1-42, and protected the hippocampal neurons against LPS-induced damage. Our results further demonstrated that rifampicin improved the neurological function by promoting autophagy through the inhibition of Akt/mTOR/p70S6K signaling pathway in the hippocampus of LPS-induced mice. CONCLUSION Rifampicin ameliorates cognitive impairment by suppression of Aβ1-42 accumulation through inhibition of Akt/mTOR/p70S6K signaling and enhancement of autophagy in the hippocampus of LPS-induced mice.
Collapse
Affiliation(s)
- Lihong Zhu
- Department of Pathophysiology, School of Medicine, Jinan University, Guangzhou, PR China
| | - Qiongru Yuan
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, PR China
| | - Zhaohao Zeng
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, PR China
| | - Ruiyi Zhou
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, PR China
| | - Rixin Luo
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, PR China
| | - Jiawei Zhang
- Department of Pathophysiology, School of Medicine, Jinan University, Guangzhou, PR China
| | - Chi Kwan Tsang
- Clinical Neuroscience Institute, The First Affiliated Hospital of Jinan University, Guangzhou, PR, China
| | - Wei Bi
- Department of Neurology, The First Affiliated Hospital of Jinan University, Guangzhou, PR China.,Clinical Neuroscience Institute, The First Affiliated Hospital of Jinan University, Guangzhou, PR, China
| |
Collapse
|
3
|
Sun Y, Qin H, Zhang H, Feng X, Yang L, Hou DX, Chen J. Fisetin inhibits inflammation and induces autophagy by mediating PI3K/AKT/mTOR signaling in LPS-induced RAW264.7 cells. Food Nutr Res 2021; 65:6355. [PMID: 33841067 PMCID: PMC8009086 DOI: 10.29219/fnr.v65.6355] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 01/21/2021] [Accepted: 01/24/2021] [Indexed: 12/11/2022] Open
Abstract
Background Fisetin, a natural potent flavonoid, has various beneficial, pharmacological activities. In this study, we investigated expression changes of the fisetin regulating genes in lipopolysaccharide (LPS)-treated RAW264.7 cells and explored the role of fisetin in inflammation and autophagy. Methods and results Microarray analysis identified 1,071 genes that were regulated by fisetin in LPS-treated RAW264.7 cells, and these genes were mainly related to the process of immune system response. Quantitative real-time polymerase chain reaction and Bio-Plex analysis indicated that fisetin decreased the expression and secretion of several inflammatory cytokines in cells administered with LPS. Western blot analysis and immunofluorescence assay showed that fisetin decreased microtubule-associated protein 1 light-chain 3B (LC3B) and lysosome-associated membrane protein 1 (LAMP1) expression in LPS-treated cells, while the autophagy inhibitor chloroquine (CQ) could partially reverse this effect. In addition, fisetin reduced the elevated expression of p-PI3K, p-AKT and p-mTOR induced by LPS in a concentration-dependent manner. Conclusions Fisetin diminished the expression and secretion of inflammatory cytokines and facilitated autophagosome-lysosome fusion and degradation in LPS-treated RAW264.7 cells via inhibition of the PI3K/AKT/mTOR signaling pathway. Overall, the results of this study provide new clues for the anti-inflammatory mechanism of fisetin and explain the crosstalk between autophagy and inflammation to some extent.
Collapse
Affiliation(s)
- Yue Sun
- Xiangya School of Public Health, Central South University, Changsha, China.,Inspecting Agency, Shanghai Municipal Health Commission, Shanghai, China
| | - Hong Qin
- Xiangya School of Public Health, Central South University, Changsha, China
| | - Huihui Zhang
- Xiangya School of Public Health, Central South University, Changsha, China
| | - Xiangling Feng
- Xiangya School of Public Health, Central South University, Changsha, China
| | - Lina Yang
- Xiangya School of Public Health, Central South University, Changsha, China
| | - De-Xing Hou
- Course of Biological Science and Technology, The United Graduate School of Agricultural Sciences, Department of Food Science and Biotechnology, Faculty of Agriculture, Kagoshima University, Kagoshima, Japan
| | - Jihua Chen
- Xiangya School of Public Health, Central South University, Changsha, China
| |
Collapse
|
4
|
Lin Q, Banu K, Ni Z, Leventhal JS, Menon MC. Podocyte Autophagy in Homeostasis and Disease. J Clin Med 2021; 10:jcm10061184. [PMID: 33809036 PMCID: PMC7998595 DOI: 10.3390/jcm10061184] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Revised: 02/16/2021] [Accepted: 02/18/2021] [Indexed: 12/19/2022] Open
Abstract
Autophagy is a protective mechanism that removes dysfunctional components and provides nutrition for cells. Podocytes are terminally differentiated specialized epithelial cells that wrap around the capillaries of the glomerular filtration barrier and show high autophagy level at the baseline. Here, we provide an overview of cellular autophagy and its regulation in homeostasis with specific reference to podocytes. We discuss recent data that have focused on the functional role and regulation of autophagy during podocyte injury in experimental and clinical glomerular diseases. A thorough understanding of podocyte autophagy could shed novel insights into podocyte survival mechanisms with injury and offer potential targets for novel therapeutics for glomerular disease.
Collapse
Affiliation(s)
- Qisheng Lin
- Division of Nephrology, Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (Q.L.); (K.B.); (J.S.L.)
- Department of Nephrology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China;
| | - Khadija Banu
- Division of Nephrology, Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (Q.L.); (K.B.); (J.S.L.)
- Division of Nephrology, Yale School of Medicine, New Haven, CT 06510, USA
| | - Zhaohui Ni
- Department of Nephrology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200127, China;
| | - Jeremy S. Leventhal
- Division of Nephrology, Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (Q.L.); (K.B.); (J.S.L.)
| | - Madhav C. Menon
- Division of Nephrology, Medicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; (Q.L.); (K.B.); (J.S.L.)
- Division of Nephrology, Yale School of Medicine, New Haven, CT 06510, USA
- Correspondence:
| |
Collapse
|
5
|
Wang L, Huang B, Li C, Yang B, Jia X, Feng L. The combination of HPLC and biological analysis to determine the quality markers and its structural composition of Eclipta prostrata L. PHYTOCHEMICAL ANALYSIS : PCA 2020; 31:968-981. [PMID: 32640489 DOI: 10.1002/pca.2969] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Revised: 06/01/2020] [Accepted: 06/03/2020] [Indexed: 06/11/2023]
Abstract
INTRODUCTION The diversity and complexity of components are important reasons for the unstable efficacy and safety of Chinese materia medica (CMM) in quality control. The good and stable quality control may be related to the quality markers with structural composition of multi-components. OBJECTIVE In the present study, we take Eclipta prostrata L. as a representative example. The 11 samples were collected from the different areas in China, and the discrepancy in bioactivity and chemical composition of these samples were compared. DOX (doxorubicin hydrochloride)-induced ICR mice were established for in vivo nephrotic syndrome experiments. The biochemical indicators including 24-h urine protein, triglyceride (TG), etc. were measured and the pathological change of kidney tissue was observed. MPC-5 cells damage model was induced to compare the difference of these samples in bio-activity. High-performance liquid chromatography (HPLC) method for 11 EEP (extract of Eclipta prostrata L.) samples were performed to analyse the content of the quality markers. RESULTS In vivo experiments, EEP could mitigate the content or activity of urine protein, TG, etc. compared with the positive group (TG content was 2.53 ± 0.39 mmol/L, urinary protein quantification on 35th day was 16.79 ± 2.32 mg). In vitro experiments, CCE (coumestans component of Ecliptae) and EEP had equivalent effects on biochemical indicators such as cell viability, etc. According to the HPLC analysis, the content of wedelolactone was 45.88% and demethylwedelolactone was 23.74% in CCE. CONCLUSION The CCE with a ratio of 2:1 can be considered as a quality marker of Eclipta prostrata L.. This research may provide a perspective for quality control of CMM.
Collapse
Affiliation(s)
| | | | | | - Bin Yang
- State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, P. R. China
| | - Xiaobin Jia
- State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, P. R. China
| | - Liang Feng
- State Key Laboratory of Natural Medicines, School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, P. R. China
| |
Collapse
|
6
|
Chen Y, Wang Z, Li Q, Yu L, Zhu Y, Wang J, Sun S. oxLDL promotes podocyte migration by regulating CXCL16, ADAM10 and ACTN4. Mol Med Rep 2020; 22:1976-1984. [PMID: 32705248 PMCID: PMC7411416 DOI: 10.3892/mmr.2020.11292] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Accepted: 05/22/2020] [Indexed: 01/19/2023] Open
Abstract
Nephrotic syndrome (NS) is one of the most common causes of chronic kidney disease in the pediatric population. Hyperlipidemia is one of the main features of NS. The present study investigated the role of CXC motif chemokine ligand 16 (CXCL16) and ADAM metallopeptidase domain 10 (ADAM10) in oxidized low-density lipoprotein (oxLDL)-stimualted podocytes and the underlying mechanisms. CXCL16 and ADAM10 expression levels in oxLDL-treated podocytes were measured via reverse transcription-quantitative PCR and western blotting. Cell migration assays were conducted to assess the migration of oxLDL-treated podocytes. CXCL16 or ADAM10 overexpression and knockdown assays were conducted. The results indicated that oxLDL stimulation increased ADAM10 and CXCL16 expression levels, and enhanced podocyte migration compared with the control group. Moreover, CXCL16 and ADAM10 overexpression significantly increased podocyte migration and the expression of actinin-α4 (ACTN4) compared with the control groups. By contrast, CXCL16 and ADAM10 knockdown significantly reduced podocyte migration and the expression of ACTN4 compared with the control groups. The results suggested that oxLDL promoted podocyte migration by regulating CXCL16 and ADAM10 expression, as well as by modulating the actin cytoskeleton. Therefore, CXCL16 and ADAM10 may serve as novel therapeutic targets for primary nephrotic syndrome in children.
Collapse
Affiliation(s)
- Yuan Chen
- Department of Pediatrics, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, P.R. China
| | - Zhiyi Wang
- Department of Hepatobiliary Surgery, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, P.R. China
| | - Qian Li
- Department of Pediatrics, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, P.R. China
| | - Lichun Yu
- Department of Pediatrics, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, P.R. China
| | - Yanji Zhu
- Department of Pediatrics, People's Hospital of Rizhao, Rizhao, Shandong 276800, P.R. China
| | - Jing Wang
- Department of Pediatrics, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong 250021, P.R. China
| | - Shuzhen Sun
- Department of Pediatrics, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, P.R. China
| |
Collapse
|
7
|
Li X, Ma A, Liu K. Geniposide alleviates lipopolysaccharide-caused apoptosis of murine kidney podocytes by activating Ras/Raf/MEK/ERK-mediated cell autophagy. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2019; 47:1524-1532. [PMID: 30982359 DOI: 10.1080/21691401.2019.1601630] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Proteinuria is one of the most important clinical features of nephrotic syndrome (NS). Injury of podocyte has been proved to contribute to the occurrence of proteinuria. This study explored the effects of geniposide (GEN) on lipopolysaccharide (LPS)-caused murine kidney podocyte MPC5 apoptosis and autophagy. Viability and apoptosis of MPC5 cells were respectively detected with the help of CCK-8 assay and Guava Nexin assay. 3-Methyladenine (3-MA) was used as an autophagy inhibitor, while rapamycin as autophagy activator. Si-Beclin-1 was transfected in MPC5 cells to down-regulate the expression of Beclin-1. We found that LPS stimulation significantly caused MPC5 cell viability reduction, apoptosis and autophagy (P < .05 or P < .01). GEN treatment remarkably alleviated the LPS-caused MPC5 cell viability reduction and apoptosis, but promoted cell autophagy (P < .05). Moreover, 3-MA incubation or si-Beclin-1 transfection notably weakened the effects of GEN on LPS-caused MPC5 cell apoptosis and autophagy (P < .05), while rapamycin had opposite effects (P < .05). Furthermore, GEN activated Ras/Raf/MEK/ERK pathway in LPS-treated MPC5 cells (P < .05). In conclusion, this research verified the protective effects of GEN on podocytes damage. GEN alleviates LPS-caused apoptosis of murine kidney podocytes by activating Ras/Raf/MEK/ERK-mediated cell autophagy. Highlights: LPS causes podocyte MPC5 apoptosis and autophagy. GEN alleviates LPS-caused MPC5 cell apoptosis, but promotes cell autophagy. 3-MA or si-Beclin-1 weakens the effects of GEN on LPS-treated MPC5 cells. Rapamycin strengthens the effects of GEN on LPS-treated MPC5 cells. GEN activates Ras/Raf/MEK/ERK pathway in LPS-treated MPC5 cells.
Collapse
Affiliation(s)
- Xia Li
- a Department of Nephrology , Jining No.1 People's Hospital , Jining , China.,b Affiliated Jining No.1 People's Hospital of Jining Medical University, Jining Medical University , Jining , China
| | - Aijing Ma
- c Department of Nephrology , The Ninth People's Hospital of Chongqing , Chongqing , China
| | - Kun Liu
- a Department of Nephrology , Jining No.1 People's Hospital , Jining , China
| |
Collapse
|
8
|
Zhao D, Liu Z, Zhang H. The protective effect of the TUG1/miR‑197/MAPK1 axis on lipopolysaccharide‑induced podocyte injury. Mol Med Rep 2019; 20:49-56. [PMID: 31115515 DOI: 10.3892/mmr.2019.10216] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 01/16/2019] [Indexed: 01/02/2023] Open
Abstract
The podocyte, a type of glomerular epithelial cell, is the key constituent of the filtration barrier layer in the kidney. Previous studies have shown that long non‑coding RNA (lncRNA)‑taurine‑upregulated gene 1 (TUG1) served a protective role in diabetes‑induced podocyte damage. The aim of the present study was to investigate the potential role of TUG1 in the progress of podocyte injury induced by lipopolysaccharide (LPS), and explore the underlying mechanisms. The results showed that TUG1 expression was suppressed in LPS‑induced podocytes. Enhanced TUG1 expression by exogenous recombinant vector regulated the expression of podocyte associated proteins [Nephrin, Podocin and CCAAT/enhancer‑binding protein (CHOP)]. A marked decrease was observed in the level the albumin influx in cells transfected with TUG1. Further study indicated that microRNA (miR)‑197 is a potential target of TUG1. The enhanced level of miR‑197 induced by LPS was inhibited in cells transfected with TUG1. The decreased Nephrin and Podocin expression, upregulated CHOP expression and the increased albumin influx were slightly enhanced by miR‑197 mimic transfection, while markedly suppressed by miR‑197 inhibitor transfection in LPS‑induced podocytes. Mitogen‑activated protein kinase (MAPK) protein was predicted as a potential target of miR‑197. The downregulated expression of phosphorylated‑MAPK/MAPK induced by LPS was significantly suppressed by TUG1 transfection in podocytes. In addition to this, autophagy was promoted by TUG1 transfection via the elevation of the Beclin1 and light chain (LC)3 II/LC3 I levels, and suppressing p62 expression. However, the p38 MAPK inhibitor SB203580 reversed the changes that TUG1 induced in the levels of Beclin1, LC3 II/LC3 I and p62. Taken together, these results demonstrated that LPS‑induced podocyte injury could be alleviated by the TUG1/miR‑197/MAPK1 axis.
Collapse
Affiliation(s)
- Dong Zhao
- Department of Nephrology, Jining No. 1 People's Hospital, Jining, Shandong 272011, P.R. China
| | - Zheng Liu
- Department of Nephropathy and Diabetes Mellitus, Baoji Central Hospital, Baoji, Shaanxi 721008, P.R. China
| | - Heng Zhang
- Department of Urology, Southwest Hospital, Third Military Medical University, Chongqing 400038, P.R. China
| |
Collapse
|
9
|
Chen Y, Zhao X, Li J, Zhang L, Li R, Zhang H, Liao R, Liu S, Shi W, Liang X. Amino acid starvation promotes podocyte autophagy through mammalian target of rapamycin inhibition and transcription factor EB activation. Mol Med Rep 2018; 18:4342-4348. [PMID: 30221708 PMCID: PMC6172392 DOI: 10.3892/mmr.2018.9438] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 06/06/2018] [Indexed: 02/06/2023] Open
Abstract
Autophagy is important for maintaining normal physiological functions and podocyte cell homeostasis. Amino acid signaling is an important upstream signaling pathway for autophagy regulation. However, the function and the associated mechanism of amino acid signaling in podocyte autophagy is unclear. The present study used normal culture medium and amino acid deprivation medium to culture podocytes in vitro. Multiple methods were utilized to detect autophagic activity including western blot analysis to measure the levels of microtubule-associated protein 1 light chain 3 (LC3) II and beclin1, reverse transcription-quantitative polymerase chain reaction was performed to evaluate the levels of LC3 mRNA and transmission electron microscopy was conducted to observe autophagosomes. In addition, tandem green fluorescent protein (GFP)-monomeric red fluorescent protein (mRFP)-LC3 adenoviruses were employed to transduce podocytes to observe autophagic flux. Furthermore, the present study examined the effects of amino acid signaling on mammalian target of rapamycin (mTOR) activity and the nuclear translocation of transcription factor EB (TFEB), a core regulator of autophagy, using western blotting and immunofluorescence. The results revealed that amino acid starvation promoted the expression of LC3II and beclin1, and increased the number of autophagosomes and autolysosomes. Amino acid starvation inhibited mTOR activity, and promoted nuclear translocation and TFEB activity. Inhibition of TFEB blocked amino acid starvation-induced autophagy. These results indicated that amino acid starvation stimulated podocyte autophagy, and thus suggested that mTOR suppression and TFEB activation may mediate amino acid starvation-induced autophagy in podocytes.
Collapse
Affiliation(s)
- Yuanhan Chen
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong 510080, P.R. China
| | - Xingchen Zhao
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong 510080, P.R. China
| | - Jiaxin Li
- Cardiac Surgical Intensive Care Unit, Guangdong Cardiovascular Institute, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong 510080, P.R. China
| | - Li Zhang
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Geriatrics Institute, Guangzhou, Guangdong 510080, P.R. China
| | - Ruizhao Li
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Geriatrics Institute, Guangzhou, Guangdong 510080, P.R. China
| | - Hong Zhang
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Geriatrics Institute, Guangzhou, Guangdong 510080, P.R. China
| | - Ruyi Liao
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Geriatrics Institute, Guangzhou, Guangdong 510080, P.R. China
| | - Shuangxin Liu
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Geriatrics Institute, Guangzhou, Guangdong 510080, P.R. China
| | - Wei Shi
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong 510080, P.R. China
| | - Xinling Liang
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Geriatrics Institute, Guangzhou, Guangdong 510080, P.R. China
| |
Collapse
|
10
|
Zhao X, Chen Y, Tan X, Zhang L, Zhang H, Li Z, Liu S, Li R, Lin T, Liao R, Zhang Q, Dong W, Shi W, Liang X. Advanced glycation end-products suppress autophagic flux in podocytes by activating mammalian target of rapamycin and inhibiting nuclear translocation of transcription factor EB. J Pathol 2018; 245:235-248. [PMID: 29570219 PMCID: PMC5969319 DOI: 10.1002/path.5077] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Revised: 02/12/2018] [Accepted: 03/14/2018] [Indexed: 12/24/2022]
Abstract
Insufficient autophagy in podocytes is related to podocyte injury in diabetic nephropathy (DN). Advanced glycation end‐products (AGEs) are major factors of podocyte injury in DN. However, the role and mechanism of AGEs in autophagic dysfunction remain unknown. We investigated autophagic flux in AGE‐stimulated cultured podocytes using multiple assays: western blotting, reverse transcription–quantitative PCR, immunofluorescence staining, and electron microscopy. We also utilized chloroquine and a fluorescent probe to monitor the formation and turnover of autophagosomes. Mice of the db/db strain were used to model diabetes mellitus (DM) with high levels of AGEs. To mimic DM with normal levels of AGEs as a control, we treated db/db mice with pyridoxamine to block AGE formation. AGEs impaired autophagic flux in the cultured podocytes. Compared with db/db mice with normal AGEs but high glucose levels, db/db mice with high AGEs and high glucose levels exhibited lower autophagic activity. Aberrant autophagic flux was related to hyperactive mammalian target of rapamycin (mTOR), a major suppressor of autophagy. Pharmacologic inhibition of mTOR activity restored impaired autophagy. AGEs inhibited the nuclear translocation and activity of the pro‐autophagic transcription factor EB (TFEB) and thus suppressed transcription of its several autophagic target genes. Conversely, TFEB overexpression prevented AGE‐induced autophagy insufficiency. Attenuating mTOR activity recovered TFEB nuclear translocation under AGE stimulation. Co‐immunoprecipitation assays further demonstrated the interaction between mTOR and TFEB in AGE‐stimulated podocytes and in glomeruli from db/db mice. In conclusion, AGEs play a crucial part in suppressing podocyte autophagy under DM conditions. AGEs inhibited the formation and turnover of autophagosomes in podocytes by activating mTOR and inhibiting the nuclear translocation of TFEB. © 2018 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland.
Collapse
Affiliation(s)
- Xingchen Zhao
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong, PR China.,Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Yuanhan Chen
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong, PR China.,Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Xiaofan Tan
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China.,Division of Nephrology, Zhongshan City People's Hospital, Zhongshan Hospital of Sun Yat-sen University, Zhongshan, Guangdong, PR China
| | - Li Zhang
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Hong Zhang
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Zhilian Li
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Shuangxin Liu
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Ruizhao Li
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Ting Lin
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Ruyi Liao
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Qianmei Zhang
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Wei Dong
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Wei Shi
- The Second School of Clinical Medicine, Southern Medical University, Guangzhou, Guangdong, PR China.,Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| | - Xinling Liang
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangdong Provincial Institute of Geriatrics, Guangzhou, Guangdong, PR China
| |
Collapse
|
11
|
Baluchnejadmojarad T, Zeinali H, Roghani M. Scutellarin alleviates lipopolysaccharide-induced cognitive deficits in the rat: Insights into underlying mechanisms. Int Immunopharmacol 2018; 54:311-319. [DOI: 10.1016/j.intimp.2017.11.033] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 11/17/2017] [Accepted: 11/23/2017] [Indexed: 12/11/2022]
|