1
|
Molecular Insights of Copper Sulfate Exposure-Induced Nephrotoxicity: Involvement of Oxidative and Endoplasmic Reticulum Stress Pathways. Biomolecules 2020; 10:biom10071010. [PMID: 32650488 PMCID: PMC7407214 DOI: 10.3390/biom10071010] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 06/23/2020] [Accepted: 07/06/2020] [Indexed: 12/12/2022] Open
Abstract
The precise pathogenic mechanism in Cu exposure-cause nephrotoxicity remains unclear. This study investigated the underlying molecular mechanism of copper sulfate (CuSO4)-induced nephrotoxicity. Mice were treated with CuSO4 at 50, 100, 200 mg/kg/day or co-treated with CuSO4 (200 mg/kg/day) and 4-phenylbutyric acid (4-PBA, 100 mg/kg/day) for 28 consecutive days. HEK293 cells were treated with CuSO4 (400 μM) with or without superoxide dismutase, catalase or 4-PBA for 24 h. Results showed that CuSO4 exposure can cause renal dysfunction and tubular necrosis in the kidney tissues of mice. CuSO4 exposure up-regulated the activities and mRNA expression of caspases-9 and -3 as well as the expression of glucose-regulated protein 78 (GRP78), GRP94, DNA damage-inducible gene 153 (GADD153/CHOP), caspase-12 mRNAs in the kidney tissues. Furthermore, superoxide dismutase and catalase pre-treatments partly inhibited CuSO4-induced cytotoxicity by decreasing reactive oxygen species (ROS) production, activities of caspases-9 and -3 and DNA fragmentations in HEK293 cells. 4-PBA co-treatment significantly improved CuSO4-induced cytotoxicity in HEK293 cells and inhibited CuSO4 exposure-induced renal dysfunction and pathology damage in the kidney tissues. In conclusion, our results reveal that oxidative stress and endoplasmic reticulum stress contribute to CuSO4-induced nephrotoxicity. Our study highlights that targeting endoplasmic reticulum and oxidative stress may offer an approach for Cu overload-caused nephrotoxicity.
Collapse
|
2
|
Dai C, Xiong J, Wang Y, Shen J, Velkov T, Xiao X. Nerve Growth Factor Confers Neuroprotection against Colistin-Induced Peripheral Neurotoxicity. ACS Infect Dis 2020; 6:1451-1459. [PMID: 32422040 DOI: 10.1021/acsinfecdis.0c00107] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Neurotoxicity is an unwanted side effect for patients when receiving parenteral colistin therapy. The development of effective neuroprotective agents that can be coadministered during colistin therapy remains a priority area in antimicrobial chemotherapy. The present study aimed to investigate the protective effect of nerve growth factor (NGF) against colistin-induced peripheral neurotoxicity using a murine model. C57BL/6 mice were randomly divided into the following 6 groups: (i) untreated control, (ii) NGF alone (36 μg/kg/day administered intraperitoneally), (iii) colistin alone (18 mg/kg/day administered intraperitoneally), and (iv-vi) colistin (18 mg/kg/day) plus NGF (9, 18, and 36 μg/kg/day). After treatment for 7 days, neurobehavioral and electrophysiology changes, histopathological assessments of sciatic nerve damage, and oxidative stress biomarkers were examined. The mRNA expression levels of Nrf2, HO-1, Akt, Bax, and caspase-3 and -9 were assessed using quantitative RT-PCR. The results showed that, across all the groups wherein NGF was coadministered with colistin, a marked attenuation of colistin-induced sciatic nerve damage and improved sensory and motor function were observed. In comparison to the colistin only treatment group, animals that received NGF displayed upregulated Nrf2 and HO-1 mRNA expression levels and downregulated Bax and caspase-3 and -9 mRNA expression levels. In summary, our study reveals that NGF coadministration protects against colistin-induced peripheral neurotoxicity via the activation of Akt and Nrf2/HO-1 pathways and inhibition of oxidative stress. This study highlights the potential clinical application of NGF as a neuroprotective agent for coadministration during colistin therapy.
Collapse
Affiliation(s)
- Chongshan Dai
- College of Veterinary Medicine, China Agricultural University, Beijing 100193, P. R. China
| | - Jianli Xiong
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan 471023, P. R. China
| | - Yang Wang
- College of Veterinary Medicine, China Agricultural University, Beijing 100193, P. R. China
| | - Jianzhong Shen
- College of Veterinary Medicine, China Agricultural University, Beijing 100193, P. R. China
| | - Tony Velkov
- Department of Pharmacology & Therapeutics, School of Biomedical Sciences, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Xilong Xiao
- College of Veterinary Medicine, China Agricultural University, Beijing 100193, P. R. China
| |
Collapse
|
3
|
Wang J, Shao W, Niu H, Yang T, Wang Y, Cai Y. Immunomodulatory Effects of Colistin on Macrophages in Rats by Activating the p38/MAPK Pathway. Front Pharmacol 2019; 10:729. [PMID: 31297059 PMCID: PMC6606943 DOI: 10.3389/fphar.2019.00729] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 06/05/2019] [Indexed: 01/25/2023] Open
Abstract
Objectives: Colistin has been identified in a Caenorhabditis elegans chemical screening as an immunostimulatory agent that activates the conserved p38/PMK-1 pathway and provides protection against pathogens. Here we aimed to extend those findings to a mammalian model and evaluate the immunomodulatory effects of colistin on rat macrophages. Methods: Macrophages were isolated from Sprague-Dawley (SD) rat. The effects of colistin on the cytokine secretion, phagocytic activity and protein expression were determined by enzyme-linked immunosorbent assay (ELISA), flow cytometry, and Western blotting analysis, respectively. The relative microRNA expression was determined by microarray, and Kyoto Encylopedia of Genes and Genomes (KEGG) was used to identify potential signaling pathways. Results: Our data showed that 5, 10, and 20 µg/ml colistin significantly increased the secretion of TNF-α, while 20 and 5 µg/ml colistin significantly increased the levels of IL-1β and IL-6, respectively. Flow cytometry results showed that the relative mean fluorescence intensity and percentage of phagocytosis in colistin treatment groups were significantly higher compared with the control group, while the increased phagocytosis phenomenon can be blocked by p38 inhibitor. The phagocytic ability of macrophages against Staphylococcus aureus was significantly increased after colistin treatment. Microarray and KEGG pathway analyses revealed that mitogen-activated protein kinase (MAPK), mammalian target of rapamycin (mTOR), chemokine, and B cell receptor were the main pathways involved in the colistin stimulation process. Western blotting analysis demonstrated that the phosphorylated p38 protein level of colistin treatment groups was increased in a dose dependent manner. Conclusions: Present study is the first to demonstrate that colistin had immunomodulatory effects on macrophages in mammals, and the p38/MAPK pathway was involved in such colistin-induced immunomodulatory effect.
Collapse
Affiliation(s)
- Jin Wang
- Center of Medicine Clinical Research, Department of Pharmacy, PLA General Hospital, Beijing, China
| | - Weili Shao
- Center of Medicine Clinical Research, Department of Pharmacy, PLA General Hospital, Beijing, China
| | - Hui Niu
- Center of Medicine Clinical Research, Department of Pharmacy, PLA General Hospital, Beijing, China
| | - Tianli Yang
- Center of Medicine Clinical Research, Department of Pharmacy, PLA General Hospital, Beijing, China
| | - Yuning Wang
- Clinical Surgery Division, PLA General Hospital, Beijing, China
| | - Yun Cai
- Center of Medicine Clinical Research, Department of Pharmacy, PLA General Hospital, Beijing, China
| |
Collapse
|
4
|
Dai C, Tang S, Biao X, Xiao X, Chen C, Li J. Colistin induced peripheral neurotoxicity involves mitochondrial dysfunction and oxidative stress in mice. Mol Biol Rep 2019; 46:1963-1972. [PMID: 30783935 DOI: 10.1007/s11033-019-04646-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 01/24/2019] [Indexed: 01/08/2023]
Abstract
Polymyxin is a critical antibiotic against the infection caused by multidrug-resistant gram-negative bacteria. Neurotoxicity is one of main dose-limiting factors. The present study aimed to investigate the underlying molecular mechanism on colistin induced peripheral neurotoxicity using a mouse model. Forty mice were divided into control, colistin 1-, 3- and 7-day groups, the mice were intravenously injected with saline or colistin (sulfate) at the dose of 15 mg/kg/day for 1, 3 and 7 days, respectively. The results showed that, colistin treatment for 7 days markedly resulted in the demyelination, axonal degeneration and mitochondria swelling in the mice's sciatic tissues. Colistin treatment induces oxidative stress as well as the increases of mitochondrial permeability transition, decreases of membrane potential (ΔΨm) and activities of mitochondrial respiratory chain in the mice's sciatic nerve tissues. Furthermore, in the colistin-7 day group, adenosine-triphosphate (ATP) level Na+/K+-ATPase activity decreased to 75.2% (p < 0.01) and 80.1% (p < 0.01), respectively. Meanwhile, colistin treatment down-regulates the expression of protein kinase B (Akt) and mammalian target of rapamycin (mTOR) mRNAs and up-regulates the expression of Bax and caspase-3 mRNAs. Our results reveal that colistin induced sciatic nerves damage involves oxidative stress, mitochondrial dysfunction and the inhibition of Akt/mTOR pathway.
Collapse
Affiliation(s)
- Chongshan Dai
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China.,College of Veterinary Medicine, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Shusheng Tang
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Xiang Biao
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Xilong Xiao
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Chunli Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China.
| | - Jichang Li
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China.
| |
Collapse
|
5
|
Edrees NE, Galal AA, Abdel Monaem AR, Beheiry RR, Metwally MM. Curcumin alleviates colistin-induced nephrotoxicity and neurotoxicity in rats via attenuation of oxidative stress, inflammation and apoptosis. Chem Biol Interact 2018; 294:56-64. [DOI: 10.1016/j.cbi.2018.08.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 07/13/2018] [Accepted: 08/15/2018] [Indexed: 12/29/2022]
|
6
|
Togashi S, Takahashi K, Tamura A, Toyota I, Hatakeyama S, Komatsuda A, Kudo I, Sasaki Kudoh E, Okamoto T, Haga A, Miyamoto A, Grave E, Sugawara T, Shimizu H, Itoh H. High dose of antibiotic colistin induces oligomerization of molecular chaperone HSP90. J Biochem 2017; 162:27-36. [PMID: 28201527 DOI: 10.1093/jb/mvw104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 12/15/2016] [Indexed: 11/12/2022] Open
Abstract
Colistin is an antimicrobial cationic peptide that belongs to the polymyxin family. Colistin was clinically used for the treatment of gram-negative infections but fell out of favour because of its significant side effects including neurotoxicity and nephrotoxicity. More recently, colistin has been regarded as one of the important options for nosocomial infections caused by multidrug resistant bacteria. Mechanisms of both the side effect onset of the drug and the side effect reduction are yet to be elucidated. In this study, we identified the specific binding protein of colistin using an affinity column chromatography. Colistin binds to the molecular chaperone HSP90. Although colistin slightly suppressed the chaperone activity of HSP90, there are no effects on the ATPase activity for a low concentration of colistin. Interestingly, colistin-induced aggregation of HSP90 via the N-domain. As for the cell viability of the SHSY5Y cell, the cell viability decreased to approximately 80% by the colistin 300 μM. However, the cell viability recovered to approximately 100% by adding ATP dosage. The same result was obtained by dot blot assay using anti-HSP90 antibody. Our results may help to understand the side effect mechanism of colistin.
Collapse
Affiliation(s)
- Shuntaro Togashi
- Department of Neurosurgery, Akita University Graduate School of Medicine, Akita 010-8543, Japan
| | - Kyosuke Takahashi
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| | - Arisa Tamura
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| | - Ikumi Toyota
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| | - Shiori Hatakeyama
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| | - Atsushi Komatsuda
- Department of Hematology, Nephrology, Rheumatology, Akita University Graduate School of Medicine, Akita 010-8543, Japan
| | - Ikuru Kudo
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| | - Erina Sasaki Kudoh
- Department of Neurosurgery, Akita University Graduate School of Medicine, Akita 010-8543, Japan
| | - Tomoya Okamoto
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| | - Asami Haga
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| | - Asuka Miyamoto
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| | - Ewa Grave
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| | - Taku Sugawara
- Department of Spinal cord and Spine Surgery, Research Institute for Brain and Blood Vessels-Akita, 010-0874 Akita, Japan
| | - Hiroaki Shimizu
- Department of Neurosurgery, Akita University Graduate School of Medicine, Akita 010-8543, Japan
| | - Hideaki Itoh
- Department of Life Science, Akita University Graduate School of Engineering Science, Akita 010-8502, Japan
| |
Collapse
|
7
|
Dai C, Li B, Zhou Y, Li D, Zhang S, Li H, Xiao X, Tang S. Curcumin attenuates quinocetone induced apoptosis and inflammation via the opposite modulation of Nrf2/HO-1 and NF-kB pathway in human hepatocyte L02 cells. Food Chem Toxicol 2016; 95:52-63. [DOI: 10.1016/j.fct.2016.06.025] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 06/18/2016] [Accepted: 06/25/2016] [Indexed: 01/06/2023]
|
8
|
Cho EJ, Doh KO, Park J, Hyun H, Wilson EM, Snyder PW, Tsifansky MD, Yeo Y. Zwitterionic chitosan for the systemic treatment of sepsis. Sci Rep 2016; 6:29739. [PMID: 27412050 PMCID: PMC4944199 DOI: 10.1038/srep29739] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Accepted: 06/23/2016] [Indexed: 12/29/2022] Open
Abstract
Severe sepsis and septic shock are life-threatening conditions, with Gram-negative organisms responsible for most sepsis mortality. Systemic administration of compounds that block the action of lipopolysaccharide (LPS), a constituent of the Gram-negative outer cell membrane, is hampered by their hydrophobicity and cationic charge, the very properties responsible for their interactions with LPS. We hypothesize that a chitosan derivative zwitterionic chitosan (ZWC), previously shown to suppress the production of pro-inflammatory cellular mediators in LPS-challenged macrophages, will have protective effects in an animal model of sepsis induced by systemic injection of LPS. In this study, we evaluate whether ZWC attenuates the fatal effect of LPS in C57BL/6 mice and investigate the mechanism by which ZWC counteracts the LPS effect using a PMJ2-PC peritoneal macrophage cell line. Unlike its parent compound with low water solubility, intraperitoneally administered ZWC is readily absorbed with no local residue or adverse tissue reaction at the injection site. Whether administered at or prior to the LPS challenge, ZWC more than doubles the animals' median survival time. ZWC appears to protect the LPS-challenged organisms by forming a complex with LPS and thus attenuating pro-inflammatory signaling pathways. These findings suggest that ZWC have utility as a systemic anti-LPS agent.
Collapse
Affiliation(s)
- Eun Jung Cho
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA
| | - Kyung-Oh Doh
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA
- Department of Physiology, College of Medicine, Yeungnam University, 317-1 Daemyung-dong, Daegu, Korea
| | - Jinho Park
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA
| | - Hyesun Hyun
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA
| | - Erin M. Wilson
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA
| | - Paul W. Snyder
- Department of Comparative Pathobiology, College of Veterinary Medicine, Purdue University, 625 Harrison Street, West Lafayette, IN 47907, USA
| | - Michael D. Tsifansky
- Department of Pediatrics and the Congenital Heart Center, College of Medicine, University of Florida, 1600 SW Archer Road, Gainesville, FL 32610, USA
| | - Yoon Yeo
- Department of Industrial and Physical Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, IN 47907, USA
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
| |
Collapse
|
9
|
Dai C, Tang S, Velkov T, Xiao X. Colistin-Induced Apoptosis of Neuroblastoma-2a Cells Involves the Generation of Reactive Oxygen Species, Mitochondrial Dysfunction, and Autophagy. Mol Neurobiol 2015; 53:4685-700. [PMID: 26316077 DOI: 10.1007/s12035-015-9396-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 08/11/2015] [Indexed: 12/22/2022]
Abstract
Neurotoxicity remains a poorly characterized adverse effect associated with colistin therapy. The aim of the present study was to investigate the mechanism of colistin-induced neurotoxicity using the mouse neuroblastoma2a (N2a) cell line. Colistin treatment (0-200 μM) of N2a neuronal cells induced apoptotic cell death in a dose-dependent manner. Colistin-induced neurotoxicity was associated with a significant increase of reactive oxygen species (ROS) levels, with a concomitant decrease in the activities of superoxide dismutase (SOD), catalase (CAT), and the glutathione (GSH) levels. Mitochondrial dysfunction was evident from the dissipation of membrane potential and the increase of Bax/Bcl-2, followed by the release of cytochrome c (CytC). Caspase-3/7, -8, and -9 activations were also detected. Colistin-induced neurotoxicity significantly increased the gene expression of p53 (1.6-fold), Bax (3.3-fold), and caspase-8 (2.2-fold) (all p < 0.01). The formation of autophagic vacuoles was evident with the significant increases (all p < 0.05 or 0.01) of both of Beclin 1 and LC3B following colistin treatment (50-200 μM). Furthermore, inhibition of autophagy by pretreatment with chloroquine diphosphate (CQ) enhanced colistin-induced apoptosis via caspase activation, which could be attenuated by co-treatment with the pan-caspase inhibitor Z-VAD-FMK. In summary, our study reveals that colistin-induced neuronal cell death involves ROS-mediated oxidative stress and mitochondrial dysfunction, followed by caspase-dependent apoptosis and autophagy. A knowledge base of the neuronal signaling pathways involved in colistin-induced neurotoxicity will greatly facilitate the discovery of neuroprotective agents for use in combination with colistin to prevent this undesirable side effect.
Collapse
Affiliation(s)
- Chongshan Dai
- College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Beijing, 100193, People's Republic of China
| | - Shusheng Tang
- College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Beijing, 100193, People's Republic of China
| | - Tony Velkov
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Victoria, 3052, Australia.
| | - Xilong Xiao
- College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Beijing, 100193, People's Republic of China.
| |
Collapse
|
10
|
Autophagy regulates colistin-induced apoptosis in PC-12 cells. Antimicrob Agents Chemother 2015; 59:2189-97. [PMID: 25645826 DOI: 10.1128/aac.04092-14] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Colistin is a cyclic cationic polypeptide antibiotic with activity against multidrug-resistant Gram-negative bacteria. Our recent study demonstrated that colistin induces apoptosis in primary chick cortex neurons and PC-12 cells. Although apoptosis and autophagy have different impacts on cell fate, there is a complex interaction between them. Autophagy plays an important role as a homeostasis regulator by removing excessive or unnecessary proteins and damaged organelles. The aim of the present study was to investigate the modulation of autophagy and apoptosis regulation in PC-12 cells in response to colistin treatment. PC-12 cells were exposed to colistin (125 to 250 μg/ml), and autophagy was detected by visualization of monodansylcadaverine (MDC)-labeled vacuoles, LC3 (microtubule-associated protein 1 light chain 3) immunofluorescence microscopic examination, and Western blotting. Apoptosis was measured by flow cytometry, Hoechst 33258 staining, and Western blotting. Autophagosomes were observed after treatment with colistin for 12 h, and the levels of LC3-II gene expression were determined; observation and protein levels both indicated that colistin induced a high level of autophagy. Colistin treatment also led to apoptosis in PC-12 cells, and the level of caspase-3 expression increased over the 24-h period. Pretreatment of cells with 3-methyladenine (3-MA) increased colistin toxicity in PC-12 cells remarkably. However, rapamycin treatment significantly increased the expression levels of LC3-II and beclin 1 and decreased the rate of apoptosis of PC-12 cells. Our results demonstrate that colistin induced autophagy and apoptosis in PC-12 cells and that the latter was affected by the regulation of autophagy. It is very likely that autophagy plays a protective role in the reduction of colistin-induced cytotoxicity in neurons.
Collapse
|
11
|
Lycopene attenuates colistin-induced nephrotoxicity in mice via activation of the Nrf2/HO-1 pathway. Antimicrob Agents Chemother 2014; 59:579-85. [PMID: 25385104 DOI: 10.1128/aac.03925-14] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Nephrotoxicity is the major dose-limiting factor for the clinical use of colistin against multidrug-resistant (MDR) Gram-negative bacteria. This study aimed to investigate the protective effect of lycopene on colistin-induced nephrotoxicity in a mouse model. Fifty mice were randomly divided into 5 groups: the control group (saline solution), the lycopene group (20 mg/kg of body weight/day administered orally), the colistin group (15 mg/kg/day administered intravenously), the colistin (15 mg/kg/day) plus lycopene (5 mg/kg/day) group, and the colistin (15 mg/kg/day) plus lycopene (20 mg/kg/day) group; all mice were treated for 7 days. At 12 h after the last dose, blood was collected for measurements of blood urea nitrogen (BUN) and serum creatinine levels. The kidney tissue samples were obtained for examination of biomarkers of oxidative stress and apoptosis, histopathological assessment, and quantitative reverse transcription-PCR (qRT-PCR) analysis. Colistin treatment significantly increased concentrations of BUN and serum creatinine, tubular apoptosis/necrosis, lipid peroxidation, and heme oxygenase 1 (HO-1) activity, while the treatment decreased the levels of endogenous antioxidant biomarkers glutathione (GSH), catalase (CAT), and superoxide dismutase (SOD). Notably, the changes in the levels of all biomarkers were attenuated in the kidneys of mice treated with colistin by lycopene (5 or 20 mg/kg). Lycopene treatment, especially in the colistin plus lycopene (20 mg/kg) group, significantly downregulated the expression of NF-κB mRNA (P < 0.01) but upregulated the expression of nuclear factor erythroid 2-related factor 2 (Nrf2) and HO-1 mRNA (both P < 0.01) in the kidney compared with the results seen with the colistin group. Our data demonstrated that coadministration of 20 mg/kg/day lycopene can protect against colistin-induced nephrotoxicity in mice. This effect may be attributed to the antioxidative property of lycopene and its ability to activate the Nrf2/HO-1 pathway.
Collapse
|
12
|
Rodriguez R, Barrios Steed D, Kawamata Y, Su S, Smith PA, Steed TC, Romesberg FE, Baran PS. Axinellamines as broad-spectrum antibacterial agents: scalable synthesis and biology. J Am Chem Soc 2014; 136:15403-13. [PMID: 25328977 PMCID: PMC4227811 DOI: 10.1021/ja508632y] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Indexed: 01/17/2023]
Abstract
Antibiotic-resistant bacteria present an ongoing challenge to both chemists and biologists as they seek novel compounds and modes of action to out-maneuver continually evolving resistance pathways, especially against Gram-negative strains. The dimeric pyrrole-imidazole alkaloids represent a unique marine natural product class with diverse primary biological activity and chemical architecture. This full account traces the strategy used to develop a second-generation route to key spirocycle 9, culminating in a practical synthesis of the axinellamines and enabling their discovery as broad-spectrum antibacterial agents, with promising activity against both Gram-positive and Gram-negative bacteria. While their detailed mode of antibacterial action remains unclear, the axinellamines appear to cause secondary membrane destabilization and impart an aberrant cellular morphology consistent with the inhibition of normal septum formation. This study serves as a rare example of a natural product initially reported to be devoid of biological activity surfacing as an active antibacterial agent with an intriguing mode of action.
Collapse
Affiliation(s)
- Rodrigo
A. Rodriguez
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Danielle Barrios Steed
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Yu Kawamata
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Shun Su
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Peter A. Smith
- RQx
Pharmaceuticals, Inc., 11099 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Tyler C. Steed
- School
of Medicine, University of California, San
Diego, 9500 Gilman Drive, San Diego, California 92093, United States
| | - Floyd E. Romesberg
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Phil S. Baran
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| |
Collapse
|
13
|
Colistin-induced nephrotoxicity in mice involves the mitochondrial, death receptor, and endoplasmic reticulum pathways. Antimicrob Agents Chemother 2014; 58:4075-85. [PMID: 24798292 DOI: 10.1128/aac.00070-14] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Nephrotoxicity is the dose-limiting factor for colistin, but the exact mechanism is unknown. This study aimed to investigate the roles of the mitochondrial, death receptor, and endoplasmic reticulum pathways in colistin-induced nephrotoxicity. Mice were intravenously administered 7.5 or 15 mg of colistin/kg of body weight/day (via a 3-min infusion and divided into two doses) for 7 days. Renal function, oxidative stress, and apoptosis were measured. Representative biomarkers involved in the mitochondrial, death receptor, and endoplasmic reticulum pathways were investigated, and the key markers involved in apoptosis and autophagy were examined. After 7-day colistin treatment, significant increase was observed with blood urea nitrogen, serum creatinine, and malondialdehyde, while activities of superoxide dismutase (SOD) and catalase decreased in the kidneys. Acute tubular necrosis and mitochondrial dysfunction were detected, and colistin-induced apoptosis was characterized by DNA fragmentation, cleavage of poly(ADP-ribose) polymerase (PARP-1), increase of 8-hydroxydeoxyguanosine (8-OHdG), and activation of caspases (caspase-8, -9, and -3). It was evident that colistin-induced apoptosis involved the mitochondrial pathway (downregulation of Bcl-2 and upregulation of cytochrome C [cytC] and Bax), death receptor pathway (upregulation of Fas, FasL, and Fas-associated death domain [FADD]), and endoplasmic reticulum pathway (upregulation of Grp78/Bip, ATF6, GADD153/CHOP, and caspase-12). In the 15-mg/kg/day colistin group, expression of the cyclin-dependent kinase 2 (CDK2) and phosphorylated JNK (p-JNK) significantly increased (P < 0.05), while in the 7.5-mg/kg/day colistin group, a large number of autophagolysosomes and classic autophagy were observed. Western blot results of Beclin-1 and LC3B indicated that autophagy may play a protective role in colistin-induced nephrotoxicity. In conclusion, this is the first study to demonstrate that all three major apoptosis pathways and autophagy are involved in colistin-induced nephrotoxicity.
Collapse
|