1
|
Yang X, Zhang J, Li Y, Hu H, Li X, Ma T, Zhang B. Si-Ni-San promotes liver regeneration by maintaining hepatic oxidative equilibrium and glucose/lipid metabolism homeostasis. JOURNAL OF ETHNOPHARMACOLOGY 2024; 326:117918. [PMID: 38382654 DOI: 10.1016/j.jep.2024.117918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 02/08/2024] [Accepted: 02/13/2024] [Indexed: 02/23/2024]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE The efficacy of clinical treatments for various liver diseases is intricately tied to the liver's regenerative capacity. Insufficient or failed liver regeneration is a direct cause of mortality following fulminant hepatic failure and extensive hepatectomy. Si-Ni-San (SNS), a renowned traditional Chinese medicine prescription for harmonizing liver and spleen functions, has shown clinical efficacy in the alleviation of liver injury for thousands of years. However, the precise molecular pharmacological mechanisms underlying its effects remain unclear. AIMS OF THE STUDY This study aimed to investigate the effects of SNS on liver regeneration and elucidate the underlying mechanisms. MATERIALS AND METHODS A mouse model of 70% partial hepatectomy (PHx) was used to analyze the effects of SNS on liver regeneration. Aquaporin-9 knockout mice (AQP9-/-) were used to demonstrate that SNS-mediated enhancement of liver regeneration was AQP9-targeted. A tandem dimer-Tomato-tagged AQP9 transgenic mouse line (AQP9-RFP) was utilized to determine the expression pattern of AQP9 protein in hepatocytes. Immunoblotting, quantitative real-time PCR, staining techniques, and biochemical assays were used to further explore the underlying mechanisms of SNS. RESULTS SNS treatment significantly enhanced liver regeneration and increased AQP9 protein expression in hepatocytes of wild-type mice (AQP9+/+) post 70% PHx, but had no significant effects on AQP9-/- mice. Following 70% PHx, SNS helped maintain hepatic oxidative equilibrium by increasing the levels of reactive oxygen species scavengers glutathione and superoxide dismutase and reducing the levels of oxidative stress molecules H2O2 and malondialdehyde in liver tissues, thereby preserving this crucial process for hepatocyte proliferation. Simultaneously, SNS augmented glycerol uptake by hepatocytes, stimulated gluconeogenesis, and maintained glucose/lipid metabolism homeostasis, ensuring the energy supply required for liver regeneration. CONCLUSIONS This study provides the first evidence that SNS maintains liver oxidative equilibrium and glucose/lipid metabolism homeostasis by upregulating AQP9 expression in hepatocytes, thereby promoting liver regeneration. These findings offer novel insights into the molecular pharmacological mechanisms of SNS in promoting liver regeneration and provide guidance for its clinical application and optimization in liver disease treatment.
Collapse
Affiliation(s)
- Xu Yang
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Junqi Zhang
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Yanghao Li
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Huiting Hu
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Xiang Li
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Tonghui Ma
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China.
| | - Bo Zhang
- School of Medicine & Holistic Integrative Medicine, Nanjing University of Chinese Medicine, Nanjing, 210023, China.
| |
Collapse
|
2
|
Li Y, Yang X, Bao T, Sun X, Li X, Zhu H, Zhang B, Ma T. Radix Astragali decoction improves liver regeneration by upregulating hepatic expression of aquaporin-9. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 122:155166. [PMID: 37918281 DOI: 10.1016/j.phymed.2023.155166] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 10/09/2023] [Accepted: 10/24/2023] [Indexed: 11/04/2023]
Abstract
BACKGROUND The therapeutic efficacy of liver injuries heavily relies on the liver's remarkable regenerative capacity, necessitating the maintenance of glycose/lipids homeostasis and oxidative eustasis during the recovery process. Astragali Radix, an herbal tonic widely used in China and many other countries, is believed to have many positive effects, including immune stimulation, nourishing, antioxidant, liver protection, diuresis, anti-diabetes, anti-cancer and expectorant. Astragali Radix is widely integrated into hepatoprotective formulas as it is believed to facilitate liver regeneration. Nevertheless, the precise molecular pharmacological mechanisms underlying this hepatoprotective effect remain elusive. PURPOSE To investigate the improving effects of Astragali Radix on liver regeneration and the underlying mechanisms. METHODS A mouse model of 70% partial hepatectomy (PHx) was employed to investigate the impact of Radix Astragali decoction (HQD) on liver regeneration. HQD was orally administered for 7 days before the PHx procedure and throughout the experiment. N-acetylcysteine (NAC) was used as a positive control for liver regeneration. Liver regeneration was assessed by evaluating the liver-to-body weight ratio (LW/BW) and the expression of representative cell proliferation marker proteins. Oxidative stress and glucose metabolism were analyzed using biochemical assays, Western blotting, dihydroethidium (DHE) fluorescence, and periodic acid-Schiff (PAS) staining methods. To understand the role of AQP9 as a potential molecular target of HQD in promoting liver regeneration, td-Tomato-tagged AQP9 transgenic mice (AQP9-RFP) were employed to determine the expression pattern of AQP9 protein. AQP9 knockout mice (AQP9-/-) were used to assess the specific targeting of AQP9 in the promotion of liver regeneration by HQD. RESULTS HQD significantly upregulated hepatic AQP9 expression, alleviated liver injury and promoted liver regeneration in wild-type (AQP9+/+) mice after 70% PHx. However, the beneficial impact of HQD on liver regeneration was absent in AQP9 gene knockout (AQP9-/-) mice. Moreover, HQD facilitated the uptake of glycerol by hepatocytes, enhanced gluconeogenesis, and concurrently reduced H2O2 content and oxidative stress levels in AQP9+/+ but not AQP9-/- mouse livers. Additionally, main active substance of Radix Astragali, astragaloside IV (AS-IV) and cycloastragenol (CAG), demonstrated substantial upregulation of AQP9 expression and promoted liver regeneration in AQP9+/+ but not AQP9-/- mice. CONCLUSION This study is the first to demonstrate that Radix Astragali and its main active constituents (AS-IV and CAG) improve liver regeneration by upregulating the expression of AQP9 in hepatocytes to increase gluconeogenesis and reduce oxidative stress. The study revealed novel molecular pharmacological mechanisms of Radix Astragali and provided a promising therapeutic target of liver diseases.
Collapse
Affiliation(s)
- Yanghao Li
- School of Medicine & Holistic Integrative Medicine, Department of Pathology and Pathophysiology, Nanjing University of Chinese Medicine, Xianlin Avenue 138, Nanjing, Jiangsu 210023, China
| | - Xu Yang
- School of Medicine & Holistic Integrative Medicine, Department of Pathology and Pathophysiology, Nanjing University of Chinese Medicine, Xianlin Avenue 138, Nanjing, Jiangsu 210023, China
| | - Tiantian Bao
- School of Medicine & Holistic Integrative Medicine, Department of Pathology and Pathophysiology, Nanjing University of Chinese Medicine, Xianlin Avenue 138, Nanjing, Jiangsu 210023, China
| | - Xiaojuan Sun
- School of Medicine & Holistic Integrative Medicine, Department of Pathology and Pathophysiology, Nanjing University of Chinese Medicine, Xianlin Avenue 138, Nanjing, Jiangsu 210023, China
| | - Xiang Li
- School of Medicine & Holistic Integrative Medicine, Department of Pathology and Pathophysiology, Nanjing University of Chinese Medicine, Xianlin Avenue 138, Nanjing, Jiangsu 210023, China
| | - Huilin Zhu
- School of Medicine & Holistic Integrative Medicine, Department of Pathology and Pathophysiology, Nanjing University of Chinese Medicine, Xianlin Avenue 138, Nanjing, Jiangsu 210023, China
| | - Bo Zhang
- School of Medicine & Holistic Integrative Medicine, Department of Pathology and Pathophysiology, Nanjing University of Chinese Medicine, Xianlin Avenue 138, Nanjing, Jiangsu 210023, China.
| | - Tonghui Ma
- School of Medicine & Holistic Integrative Medicine, Department of Pathology and Pathophysiology, Nanjing University of Chinese Medicine, Xianlin Avenue 138, Nanjing, Jiangsu 210023, China.
| |
Collapse
|
3
|
Dong J, Qiu X, Huang M, Chen X, Li Y. G-quadruplex-hemin DNAzyme functionalized nanopipettes: Fabrication and sensing application. Talanta 2023; 257:124384. [PMID: 36812658 DOI: 10.1016/j.talanta.2023.124384] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 02/15/2023] [Accepted: 02/17/2023] [Indexed: 02/21/2023]
Abstract
Solid-nanopores/nanopipettes have the exquisite ability to reveal the changes in molecular volume due to the advantages of adjustable size, good rigidity and low noise. Herein, a new platform for sensing application was established based on G-quadruplex-hemin DNAzyme (GQH) functionalized gold-coated nanopipettes. In this method, GQH was immobilized on gold-coated nanopipette, which could be used as a catalyst for the reaction of H2O2 with 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) to promote the conversion of ABTS to ABTS+ ions inside gold-coated nanopipette, and the change of transmembrane ion current could be monitored in real time. At the optimal conditions, there was a correlation between the ion current and the concentration of H2O2 in a certain range, which could be used for the hydrogen peroxide sensing. The GQH immobilized nanopipette provides a useful platform to investigate enzymatic catalysis in confined environment, which can be used in electrocatalysis, sensing and fundamental electrochemistry.
Collapse
Affiliation(s)
- Jingyi Dong
- Key Laboratory of Functional Molecular Solids (Ministry of Education), Anhui Key Laboratory of Chemo/Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China
| | - Xia Qiu
- Key Laboratory of Functional Molecular Solids (Ministry of Education), Anhui Key Laboratory of Chemo/Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China
| | - Mimi Huang
- Key Laboratory of Functional Molecular Solids (Ministry of Education), Anhui Key Laboratory of Chemo/Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China
| | - Xiaohu Chen
- Key Laboratory of Functional Molecular Solids (Ministry of Education), Anhui Key Laboratory of Chemo/Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China
| | - Yongxin Li
- Key Laboratory of Functional Molecular Solids (Ministry of Education), Anhui Key Laboratory of Chemo/Biosensing, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, PR China.
| |
Collapse
|
4
|
Yang CY, Yang CF, Tang XF, Machado LESF, Singh JP, Peti W, Chen CS, Meng TC. Active-site cysteine 215 sulfonation targets protein tyrosine phosphatase PTP1B for Cullin1 E3 ligase-mediated degradation. Free Radic Biol Med 2023; 194:147-159. [PMID: 36462629 DOI: 10.1016/j.freeradbiomed.2022.11.041] [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: 09/20/2022] [Revised: 11/14/2022] [Accepted: 11/29/2022] [Indexed: 12/03/2022]
Abstract
Reactive oxygen species (ROS), released as byproducts of mitochondrial metabolism or as products of NADPH oxidases and other processes, can directly oxidize the active-site cysteine (Cys) residue of protein tyrosine phosphatases (PTPs) in a mammalian cell. Robust degradation of irreversibly oxidized PTPs is essential for preventing accumulation of these permanently inactive enzymes. However, the mechanism underlying the degradation of these proteins was unknown. In this study, we found that the active-site Cys215 of endogenous PTP1B is sulfonated in H9c2 cardiomyocytes under physiological conditions. The sulfonation of Cys215 led PTP1B to exhibit a conformational change, and drive the subsequent ubiquitination and degradation of this protein. We then discovered that Cullin1, an E3 ligase, interacts with the Cys215-sulfonated PTP1B. The functional impairment of Cullin1 prevented PTP1B from oxidation-dependent ubiquitination and degradation in H9c2 cells. Moreover, delivery of the terminally oxidized PTP1B resulted in proteotoxicity-caused injury in the affected cells. In conclusion, we elucidate how sulfonation of the active-site Cys215 can direct turnover of endogenous PTP1B through the engagement of ubiquitin-proteasome system. These data highlight a novel mechanism that maintains PTP homeostasis in cardiomyocytes with constitutive ROS production.
Collapse
Affiliation(s)
- Chun-Yi Yang
- Institute of Biological Chemistry, Academia Sinica, Taipei, 115, Taiwan; Institute of Biochemical Sciences, National Taiwan University, Taipei, 115, Taiwan
| | - Chiu-Fen Yang
- Institute of Biological Chemistry, Academia Sinica, Taipei, 115, Taiwan; Department of Cardiology, Cardiovascular Research Center, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, 970, Taiwan
| | - Xiao-Fang Tang
- Graduate Institute of Systems Biology and Bioinformatics, National Central University, 300 Jhongda Road, Jhongli, 320, Taiwan
| | - Luciana E S F Machado
- Department of Genetics and Evolutionary Biology, Institute of Biosciences, University of São Paulo, São Paulo, SP, 05508-090, Brazil
| | - Jai Prakash Singh
- Institute of Biological Chemistry, Academia Sinica, Taipei, 115, Taiwan
| | - Wolfgang Peti
- Department of Molecular Biology and Biophysics, University of Connecticut Health Center, Farmington, CT, 06030, USA
| | - Chien-Sheng Chen
- Graduate Institute of Systems Biology and Bioinformatics, National Central University, 300 Jhongda Road, Jhongli, 320, Taiwan; Department of Biomedical Science and Engineering, National Central University, Jongli District, Taoyuan City, 32001, Taiwan; Department of Food Safety / Hygiene and Risk Management, National Cheng Kung University, Tainan, Taiwan
| | - Tzu-Ching Meng
- Institute of Biological Chemistry, Academia Sinica, Taipei, 115, Taiwan; Institute of Biochemical Sciences, National Taiwan University, Taipei, 115, Taiwan.
| |
Collapse
|
5
|
Impact of various factors on the kinetics of non-enzymatic fragmentation of a monoclonal antibody. Eur J Pharm Biopharm 2022; 178:131-139. [PMID: 35961566 DOI: 10.1016/j.ejpb.2022.08.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 08/03/2022] [Accepted: 08/07/2022] [Indexed: 11/22/2022]
Abstract
Non-enzymatic hinge fragmentation of monoclonal antibodies (mAb) is considered a critical quality attribute since it changes the primary sequence of the proteins, thereby leading to structural changes which can affect stability, function, and efficacy. While peptide bonds are exceptionally stable under physiological conditions, reactive side chains of a few residues, the flexibility of the backbone, and physicochemical parameters such as pH, temperature, and the reaction of radicals and metal ions can promote the cleavage of peptide bonds. In this study, the relative extent and rate of fragmentation are compared with respect to the presence of several different factors (including hydrogen peroxide, metal ion, and temperature) as measured by size exclusion chromatography. A kinetic model of monomer degradation as a function of time (mAb only) is created. In the presence of either H2O2 or Cu2+, or both, the reaction kinetics follow different orders depending on the reaction conditions. The half-life for peptide bond cleavage of the mAb hinge region was 385 days at 40 °C and decreases to 250, 48, and 45 days in the presence of H2O2, Cu2+, and a combination of H2O2 and Cu2+, respectively. A temperature dependence of peptide bond cleavage at 35 °C, 40 °C, 45 °C, and 50 °C showed Arrhenius behavior with an apparent activation energy of 76.9±16.4 kJ/mol. The reaction rates obtained from the Arrhenius equation were then extrapolated to predict fragmentation rates under real storage conditions (e.g., at 2-8 °C). We demonstrate that trace levels of impurities including peroxide left after surface sterilization or degradation of non-ionic surfactants or metal ions from the buffer components can significantly affect the stability of a mAb.
Collapse
|
6
|
Zhang B, Lv D, Chen Y, Nie W, Jiao Y, Zhang J, Zhou X, Wu X, Chen S, Ma T. Aquaporin-9 facilitates liver regeneration following hepatectomy. Redox Biol 2022; 50:102246. [PMID: 35086002 PMCID: PMC8802049 DOI: 10.1016/j.redox.2022.102246] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/06/2022] [Accepted: 01/19/2022] [Indexed: 12/12/2022] Open
Abstract
Aquaporin-9 (AQP9) is an aquaglyceroporin strongly expressed in the basolateral membrane of hepatocytes facing the sinusoids. AQP9 is permeable to hydrogen peroxide (H2O2) and glycerol as well as to water. Here, we report impaired liver regeneration in AQP9−/− mice which involves altered steady-state H2O2 concentration and glucose metabolism in hepatocytes. AQP9−/− mice showed remarkably delayed liver regeneration and increased mortality following 70% or 90% partial hepatectomy. Compared to AQP9+/+ littermates, AQP9−/− mice showed significantly greater hepatic H2O2 concentration and more severe liver injury. Fluorescence measurements indicated impaired H2O2 transport across plasma membrane of primary cultured hepatocytes from AQP9−/− mice, supporting the hypothesis that AQP9 deficiency results in H2O2 accumulation and oxidative injury in regenerating liver because of reduced export of intracellular H2O2 from hepatocytes. The H2O2 overload in AQP9−/− hepatocytes reduced PI3K-Akt and insulin signaling, inhibited autophagy and promoted apoptosis, resulting in impaired proliferation and increased cell death. In addition, hepatocytes from AQP9−/− mice had low liver glycerol and high blood glycerol levels, suggesting decreased glycerol uptake and gluconeogenesis in AQP9−/− hepatocytes. Adeno-associated virus (AAV)-mediated expression of hepatic expression of aquaglyceroporins AQP9 and AQP3 in AQP9−/− mice, but not water-selective channel AQP4, fully rescued the impaired liver regeneration phenotype as well as the oxidative injury and abnormal glucose metabolism. Our data revealed a pivotal role of AQP9 in liver regeneration by regulating hepatocyte H2O2 homeostasis and glucose metabolism, suggesting AQP9 as a novel target to enhance liver regeneration following injury, surgical resection or transplantation. AQP9 mediates H2O2 and glycerol transport across hepatocytes plasma membrane AQP9−/− mice exhibit retained liver regeneration and higher mortality after PH Elevated H2O2 and reduced glucose levels appear in AQP9−/− regenerating liver Replacement of aquaglyceroporin rescued impaired AQP9−/− mouse liver regeneration AQP9 may become a novel target to improve liver regeneration
Collapse
|
7
|
Ruby, Aryan, Mehata MS. Surface plasmon resonance allied applications of silver nanoflowers synthesized from Breynia vitis-idaea leaf extract. Dalton Trans 2022; 51:2726-2736. [PMID: 35080554 DOI: 10.1039/d1dt03592d] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
An environmentally friendly, green synthesis process has been adopted to synthesize silver nanoparticles (AgNPs) in an aqueous solution from a new remedial plant. Breynia vitis-idaea leaves act like natural capping and reducing agents. The resulting AgNPs were characterized and analyzed using different characterization techniques, such as UV-Vis spectroscopy, X-ray diffraction, zeta potential, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The UV-Vis absorption spectrum showed high stability and a surface plasmon resonance (SPR) peak around 430 nm. The effects of several processing variables, such as reaction time, temperature, concentration and pH, were analyzed. High temperature and alkaline pH intensify the ability to form flower-shaped AgNPs with enhanced properties. AgNPs were investigated for antibacterial activity against Gram-negative E. coli bacterial strains with a 10 mm zone of inhibition. These AgNPs showed dye degradation up to 88% when an aqueous crystal violet dye solution was mixed with AgNPs as the catalyst. Further, AgNPs alone were effectively used in the detection of hydrogen peroxide (H2O2) in an aqueous medium with a LOD (limit of detection) of 21 μM, limit of quantification (LOQ) of 64 μM and a decrease in absorption intensity up to 89%. Based on these results, these AgNPs were effectively used in numerous fields, such as biomedical, water purification, antibacterial and sensing of H2O2.
Collapse
Affiliation(s)
- Ruby
- Laser-Spectroscopy Laboratory, Department of Applied Physics, Delhi Technological University, Bawana Road, Delhi 110042, India.
| | - Aryan
- Laser-Spectroscopy Laboratory, Department of Applied Physics, Delhi Technological University, Bawana Road, Delhi 110042, India.
| | - Mohan Singh Mehata
- Laser-Spectroscopy Laboratory, Department of Applied Physics, Delhi Technological University, Bawana Road, Delhi 110042, India.
| |
Collapse
|
8
|
Hu XB, Shang N, Chen XH, Jin ZH, He MY, Gan T, Liu YM. Culture and in situ H 2O 2-mediated electrochemical study of cancer cells using three-dimensional scaffold based on graphene foam coated with Fe 3O 4 nanozyme. Mikrochim Acta 2022; 189:89. [PMID: 35129701 DOI: 10.1007/s00604-022-05203-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 01/25/2022] [Indexed: 11/29/2022]
Abstract
For real-time evaluation of the cell behavior and function under in vivo-like 3D environment, the 3D functionalized scaffolds simultaneously integrate the function of 3D cell culture, and electrochemical sensing is a convincing candidate. Herein, Fe3O4 nanoparticles as the nanozyme (peroxide oxidase mimics) were modified on graphene foam scaffold to construct a 3D integrated platform. The platform displayed a wide linear range of 100 nM to 20 μM and a high sensitivity of 53.2 nA μM-1 toward detection of hydrogen peroxide (H2O2) under the working potential of + 0.6 V (vs. Ag/AgCl). The obtained 3D scaffold also displayed satisfactory selectivity toward the possible interferents that appeared in the cell culture environment. Furthermore, the cells still maintained high cell viability (almost 100%) after their growth and proliferation on the scaffold for 7 days. With the superior performance on cell culture and electrochemical monitoring, the functions on the 3D culture of MCF-7 or HeLa cells and in situ monitoring of cell-released H2O2 was easily achieved on this 3D platform, which show its great application prospects on further cancer-related disease diagnosis or drug screening. A nanozyme-based three-dimensional graphene scaffold was successfully constructed for cell culture and identification of cancer cells through in situ electrochemical monitoring of the cell-released H2O2.
Collapse
Affiliation(s)
- Xue-Bo Hu
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Xinyang Normal University, Xinyang, 464000, People's Republic of China.
| | - Ning Shang
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Xiao-Hui Chen
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Zi-He Jin
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Meng-Yuan He
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Tian Gan
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| | - Yan-Ming Liu
- College of Chemistry and Chemical Engineering, Xinyang Key Laboratory of Functional Nanomaterials for Bioanalysis, Xinyang Normal University, Xinyang, 464000, People's Republic of China
| |
Collapse
|
9
|
Zachut M, Contreras GA. Symposium review: Mechanistic insights into adipose tissue inflammation and oxidative stress in periparturient dairy cows. J Dairy Sci 2022; 105:3670-3686. [DOI: 10.3168/jds.2021-21225] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 12/21/2021] [Indexed: 12/15/2022]
|
10
|
Redox Regulation of Lipid Mobilization in Adipose Tissues. Antioxidants (Basel) 2021; 10:antiox10071090. [PMID: 34356323 PMCID: PMC8301038 DOI: 10.3390/antiox10071090] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/30/2021] [Accepted: 07/01/2021] [Indexed: 12/14/2022] Open
Abstract
Lipid mobilization in adipose tissues, which includes lipogenesis and lipolysis, is a paramount process in regulating systemic energy metabolism. Reactive oxygen and nitrogen species (ROS and RNS) are byproducts of cellular metabolism that exert signaling functions in several cellular processes, including lipolysis and lipogenesis. During lipolysis, the adipose tissue generates ROS and RNS and thus requires a robust antioxidant response to maintain tight regulation of redox signaling. This review will discuss the production of ROS and RNS within the adipose tissue, their role in regulating lipolysis and lipogenesis, and the implications of antioxidants on lipid mobilization.
Collapse
|
11
|
Hu XB, Qin Y, Fan WT, Liu YL, Huang WH. A Three-Dimensional Electrochemical Biosensor Integrated with Hydrogel Enables Real-Time Monitoring of Cells under Their In Vivo-like Microenvironment. Anal Chem 2021; 93:7917-7924. [PMID: 34019392 DOI: 10.1021/acs.analchem.1c00621] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Three-dimensional (3D) cell culture can better reproduce the in vivo cell environment and has been extensively used in fields such as tissue engineering, drug screening, and pathological research. Despite the tremendous advancement of 3D cultures, an analysis technique that could collect real-time information of the biological processes therein is sorely lacking. Electrochemical sensing with fast response and high sensitivity has played a vital role in real-time monitoring of living cells, but most current sensors are based on planar electrodes and fail to perfectly match the 3D cell culture matrix. Herein, we developed a robust 3D electrochemical sensor based on functionalized graphene foam (GF), which could be integrated with hydrogels for the 3D culture and in situ monitoring of cells for the first time. Specifically, platinum nanoparticles (Pt NPs) electrodeposited on GF (GF/Pt NPs) conferred the prominent electrochemical sensing performance, and the anti-fouling coating of poly(3,4-ethylenedioxythiophene) (PEDOT) endowed the GF/Pt NPs electrode with greatly improved stability. As a proof of concept, collagen hydrogel with microglia seeded in was filled into the interspace of the 3D GF/Pt NPs/PEDOT sensor to establish an integrated platform, which allowed the successful real-time monitoring of reactive oxygen species released from microglia in the collagen matrix. Given the versatility, our proposed biosensor in conjunction with various 3D culture models will serve as an excellent tool to provide biochemical information of cells under their in vivo-like microenvironment.
Collapse
Affiliation(s)
- Xue-Bo Hu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.,College of Chemistry and Chemical Engineering, Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang 464000, China
| | - Yu Qin
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Wen-Ting Fan
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Yan-Ling Liu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Wei-Hua Huang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| |
Collapse
|
12
|
Liu Y, Lopes RP, Lüdtke T, Di Silvio D, Moya S, Hamon JR, Astruc D. “Click” dendrimer-Pd nanoparticle assemblies as enzyme mimics: catalytic o-phenylenediamine oxidation and application in colorimetric H2O2 detection. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00427a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
“Click” dendrimer-Pd NPs as peroxidase enzyme mimics of H2O2 sensing using o-phenylenediamine oxidation by H2O2 to 2,3-diaminophenazine.
Collapse
Affiliation(s)
- Yue Liu
- ISM
- UMR CNRS No 5255
- Univ. Bordeaux
- 33405 Talence Cedex
- France
| | | | - Tanja Lüdtke
- Soft Matter Nanotechnology Lab
- CIC biomaGUNE
- 20014 Donostia-San Sebastián
- Spain
| | - Desire Di Silvio
- Soft Matter Nanotechnology Lab
- CIC biomaGUNE
- 20014 Donostia-San Sebastián
- Spain
| | - Sergio Moya
- Soft Matter Nanotechnology Lab
- CIC biomaGUNE
- 20014 Donostia-San Sebastián
- Spain
| | - Jean-René Hamon
- Univ Rennes
- CNRS
- ISCR (Institut des Sciences Chimiques de Rennes) – UMR 6226
- F-35000 Rennes
- France
| | - Didier Astruc
- ISM
- UMR CNRS No 5255
- Univ. Bordeaux
- 33405 Talence Cedex
- France
| |
Collapse
|
13
|
Mohammad A, Saini RV, Kumar R, Sharma D, Saini NK, Gupta A, Thakur P, Winterbourn CC, Saini AK. A curious case of cysteines in human peroxiredoxin I. Redox Biol 2020; 37:101738. [PMID: 33011678 PMCID: PMC7530344 DOI: 10.1016/j.redox.2020.101738] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 09/08/2020] [Accepted: 09/19/2020] [Indexed: 01/06/2023] Open
Abstract
Peroxiredoxins (Prxs) are antioxidant proteins that are involved in cellular defence against reactive oxygen species and reactive nitrogen species. Humans have six peroxiredoxins, hPrxI-VI, out of which hPrxI and hPrxII belongs to the typical 2-Cys class sharing 90% conservation in their amino acid sequence including catalytic residues required to carry out their peroxidase and chaperone activities. Despite the high conservation between hPrxI and hPrxII, hPrxI behaves differently from hPrxII in its peroxidase and chaperone activity. We recently showed in yeast that in the absence of Tsa1 and Tsa2 (orthologs of hPrx) hPrxI protects the cells against different stressors whereas hPrxII does not. To understand this difference, we expressed catalytic mutants of hPrxI in yeast cells lacking the orthologs of hPrxI/II. We found that the catalytic mutants lacking peroxidase function including hPrxIC52S, hPrxIC173S, hPrxIT49A, hPrxIP45A and hPrxIR128A were not able to grow on media with nitrosative stressor (sodium nitroprusside) and unable to withstand heat stress, but surprisingly they were able to grow on an oxidative stressor (H2O2). Interestingly, we found that hPrxI increases the expression of antioxidant genes, GPX1 and SOD1, and this is also seen in the case of a catalytic mutant, indicating hPrxI can indirectly reduce oxidative stress independently of its own peroxidase function and thus suggesting a novel role of hPrxI in altering the expression of other antioxidant genes. Furthermore, hPrxIC83T was resistant to hyperoxidation and formation of stable high molecular weight oligomers, which is suggestive of impaired chaperone activity. Our results suggest that the catalytic residues of hPrxI are essential to counter the nitrosative stress whereas Cys83 in hPrxI plays a critical role in hyperoxidation of hPrxI.
Collapse
Affiliation(s)
- Ashu Mohammad
- Department of Biotechnology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India; Faculty of Applied Science and Biotechnology, Shoolini University, Solan, 173229, India
| | - Reena V Saini
- Department of Biotechnology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India
| | - Rakesh Kumar
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Chandigarh, India
| | - Deepak Sharma
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Chandigarh, India
| | - Neeraj K Saini
- Department of Biotechnology, Jawaharlal Nehru University, Delhi, 110067, India
| | - Arpit Gupta
- Council of Scientific and Industrial Research-Institute of Microbial Technology, Chandigarh, India
| | - Priyanka Thakur
- Faculty of Sciences, Shoolini University, Solan, 173229, India
| | - Christine C Winterbourn
- Centre for Free Radical Research, Department of Pathology and Biomedical Science, University of Otago, Christchurch, New Zealand
| | - Adesh K Saini
- Department of Biotechnology and Central Research Cell, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, 133207, India; Maharishi Markandeshwar (Deemed to Be University), Solan, HP, 173212, India.
| |
Collapse
|
14
|
Zhang Q, Li F, Lin L, Peng J, Zhang W, Chen W, Xiang Q, Shi F, Shang W, Tao P, Song C, Huang R, Zhu H, Deng T, Wu J. Boosting Oxygen and Peroxide Reduction Reactions on PdCu Intermetallic Cubes. ChemElectroChem 2020. [DOI: 10.1002/celc.202000381] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Qingfeng Zhang
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Fan Li
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Lina Lin
- Key Laboratory of Polar Materials and Devices (MOE) and Department of ElectronicsEast China Normal University Shanghai 200062 China
| | - Jiaheng Peng
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Wencong Zhang
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Wenlong Chen
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Qian Xiang
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Fenglei Shi
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Wen Shang
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Peng Tao
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Chengyi Song
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
| | - Rong Huang
- Key Laboratory of Polar Materials and Devices (MOE) and Department of ElectronicsEast China Normal University Shanghai 200062 China
| | - Hong Zhu
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
- University of Michigan – Shanghai Jiao Tong University Joint InstituteShanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
- Materials Genome Initiative CenterShanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
| | - Tao Deng
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
- Materials Genome Initiative CenterShanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
- Center of Hydrogen ScienceShanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
| | - Jianbo Wu
- State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong University 800 Dongchuan Rd Shanghai 200240 China
- Materials Genome Initiative CenterShanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
- Center of Hydrogen ScienceShanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China
| |
Collapse
|
15
|
Shin JW, Lee JC. Roles of microglial membranes in Alzheimer's disease. CURRENT TOPICS IN MEMBRANES 2020; 86:301-314. [PMID: 33837697 PMCID: PMC8082413 DOI: 10.1016/bs.ctm.2020.08.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The majority of Alzheimer's disease (AD) risk genes are highly and selectively expressed by microglia in the brain. Several of these genes are related to lipid and cholesterol metabolism, lipid synthesis, lipid transport, endocytosis, exocytosis and phagocytosis. Therefore, studying the roles of cellular membrane biophysics in microglial function should improve our understanding of the AD pathology. In this chapter, we discuss how lipid rafts and membrane-cytoskeleton adhesion impact microglial-mediated oxidative stress and clearance of amyloid-β peptide (Aβ). We also discuss potential roles of lipid membrane-bound extracellular vesicles as carriers of pathological factors to promote inflammation and cytotoxicity.
Collapse
Affiliation(s)
- Jae-Won Shin
- Department of Bioengineering, University of Illinois at Chicago, College of Medicine, Chicago, IL, United States; Department of Pharmacology, University of Illinois at Chicago, College of Medicine, Chicago, IL, United States
| | - James C Lee
- Department of Bioengineering, University of Illinois at Chicago, College of Medicine, Chicago, IL, United States.
| |
Collapse
|
16
|
Fang H, Chen J, Lin L, Liu F, Tian H, Chen X. A Strategy of Killing Three Birds with One Stone for Cancer Therapy through Regulating the Tumor Microenvironment by H 2O 2-Responsive Gene Delivery System. ACS APPLIED MATERIALS & INTERFACES 2019; 11:47785-47797. [PMID: 31773940 DOI: 10.1021/acsami.9b18144] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Constructing an efficient in vivo gene delivery system has always been extremely challenging. Herein, a highly efficient H2O2-responsive in vivo polycationic gene delivery system is developed for the first time. The efficient vector PLL-RT (i.e., polylysine grafted with p-tosyl-l-arginine) is used to mediate plasmid DNA (pDNA) delivery, and H2O2-responsive thioketal dipropanedioic acid-modified dextran (TDPAD) is used as a shielding system for effectively coating vector/pDNA polyplexes. The constructed gene delivery system exhibits a prolonged circulatory half-life in vivo and accelerates the accumulation of vector/DNA polyplexes in tumor tissue by the enhanced permeability and retention (EPR) effect. Moreover, this gene delivery system exhibits highly efficient and synergistic antitumor effects through a strategy of killing three birds with one stone. First, upon the arrival of TDPAD/PLL-RT/pDNA [abbreviated as T(PD)] at the tumor site by the EPR effect, TDPAD reacts with excess H2O2 in tumor tissue, contributing to the detachment of TDPAD, and PLL-RT then mediates the enhanced endocytosis of pDNA encoding shVEGF and significantly downregulates the expression of vascular endothelial growth factor (VEGF) in tumor tissue, exhibiting an outstanding antitumor effect. Second, the H2O2 consumption by TDPAD significantly decreases the H2O2 level in tumor tissue, which synergistically suppresses tumor growth. Third, small-molecule product mercaptopropionic acid, generated by the reaction of TDPAD with H2O2, can induce cancer cell apoptosis and exert pronounced antitumor efficacy. This polycationic gene delivery system shows negligible toxicity in vitro and in vivo. This strategy provides an ideal platform for constructing an efficient in vivo gene delivery system and has bright prospects for cancer therapy.
Collapse
Affiliation(s)
- Huapan Fang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , China
- University of Science and Technology of China , Hefei 230026 , China
- Jilin Biomedical Polymers Engineering Laboratory , Changchun 130022 , China
| | - Jie Chen
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , China
- University of Science and Technology of China , Hefei 230026 , China
- Jilin Biomedical Polymers Engineering Laboratory , Changchun 130022 , China
| | - Lin Lin
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , China
- University of Science and Technology of China , Hefei 230026 , China
- Jilin Biomedical Polymers Engineering Laboratory , Changchun 130022 , China
| | - Feng Liu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , China
- Jilin Biomedical Polymers Engineering Laboratory , Changchun 130022 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Huayu Tian
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , China
- University of Science and Technology of China , Hefei 230026 , China
- Jilin Biomedical Polymers Engineering Laboratory , Changchun 130022 , China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , China
- University of Science and Technology of China , Hefei 230026 , China
- Jilin Biomedical Polymers Engineering Laboratory , Changchun 130022 , China
| |
Collapse
|
17
|
Abdelwahab AA, Abdel‐Hakim M, Abdelmottaleb M, Elshahawy AS. Palladium Nanoclusters Uniformly Enveloped Electrochemically Activated Graphene for Highly Sensitive Hydrogen Peroxide Sensor. ELECTROANAL 2019. [DOI: 10.1002/elan.201900119] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Adel A. Abdelwahab
- Chemistry Department, Faculty of Science and ArtsJouf University Qurayyat 75911 Saudi Arabia E-mail: aabdelwahab
- Chemistry Department, Faculty of ScienceAl-Azhar University Assiut 71524 Egypt
| | - M. Abdel‐Hakim
- Chemistry Department, Faculty of ScienceAl-Azhar University Assiut 71524 Egypt
| | | | - Anwar S. Elshahawy
- Chemistry Department, Faculty of ScienceAssiut University Assiut 71524 Egypt
| |
Collapse
|
18
|
Della Noce B, Carvalho Uhl MVD, Machado J, Waltero CF, de Abreu LA, da Silva RM, da Fonseca RN, de Barros CM, Sabadin G, Konnai S, da Silva Vaz I, Ohashi K, Logullo C. Carbohydrate Metabolic Compensation Coupled to High Tolerance to Oxidative Stress in Ticks. Sci Rep 2019; 9:4753. [PMID: 30894596 PMCID: PMC6427048 DOI: 10.1038/s41598-019-41036-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 02/26/2019] [Indexed: 01/01/2023] Open
Abstract
Reactive oxygen species (ROS) are natural byproducts of metabolism that have toxic effects well documented in mammals. In hematophagous arthropods, however, these processes are not largely understood. Here, we describe that Rhipicephalus microplus ticks and embryonic cell line (BME26) employ an adaptive metabolic compensation mechanism that confers tolerance to hydrogen peroxide (H2O2) at concentrations too high for others organisms. Tick survival and reproduction are not affected by H2O2 exposure, while BME26 cells morphology was only mildly altered by the treatment. Furthermore, H2O2-tolerant BME26 cells maintained their proliferative capacity unchanged. We evaluated several genes involved in gluconeogenesis, glycolysis, and pentose phosphate pathway, major pathways for carbohydrate catabolism and anabolism, describing a metabolic mechanism that explains such tolerance. Genetic and catalytic control of the genes and enzymes associated with these pathways are modulated by glucose uptake and energy resource availability. Transient increase in ROS levels, oxygen consumption, and ROS-scavenger enzymes, as well as decreased mitochondrial superoxide levels, were indicative of cell adaptation to high H2O2 exposure, and suggested a tolerance strategy developed by BME26 cells to cope with oxidative stress. Moreover, NADPH levels increased upon H2O2 challenge, and this phenomenon was sustained mainly by G6PDH activity. Interestingly, G6PDH knockdown in BME26 cells did not impair H2O2 tolerance, but generated an increase in NADP-ICDH transcription. In agreement with the hypothesis of a compensatory NADPH production in these cells, NADP-ICDH knockdown increased G6PDH relative transcript level. The present study unveils the first metabolic evidence of an adaptive mechanism to cope with high H2O2 exposure and maintain redox balance in ticks.
Collapse
Affiliation(s)
- Bárbara Della Noce
- Laboratório Integrado de Bioquímica Hatisaburo Masuda and Laboratório Integrado de Morfologia, NUPEM-UFRJ, Macaé, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, Rio de Janeiro, RJ, Brazil
| | - Marcelle Vianna de Carvalho Uhl
- Laboratório Integrado de Bioquímica Hatisaburo Masuda and Laboratório Integrado de Morfologia, NUPEM-UFRJ, Macaé, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, Rio de Janeiro, RJ, Brazil
| | - Josias Machado
- Laboratório Integrado de Bioquímica Hatisaburo Masuda and Laboratório Integrado de Morfologia, NUPEM-UFRJ, Macaé, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, Rio de Janeiro, RJ, Brazil
| | - Camila Fernanda Waltero
- Laboratório Integrado de Bioquímica Hatisaburo Masuda and Laboratório Integrado de Morfologia, NUPEM-UFRJ, Macaé, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, Rio de Janeiro, RJ, Brazil
| | - Leonardo Araujo de Abreu
- Laboratório Integrado de Bioquímica Hatisaburo Masuda and Laboratório Integrado de Morfologia, NUPEM-UFRJ, Macaé, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, Rio de Janeiro, RJ, Brazil
| | - Renato Martins da Silva
- Laboratory of Infectious Diseases, Hokkaido University, Sapporo, 060-0818, Japan
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, Rio de Janeiro, RJ, Brazil
| | - Rodrigo Nunes da Fonseca
- Laboratório Integrado de Bioquímica Hatisaburo Masuda and Laboratório Integrado de Morfologia, NUPEM-UFRJ, Macaé, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, Rio de Janeiro, RJ, Brazil
| | - Cintia Monteiro de Barros
- Laboratório Integrado de Bioquímica Hatisaburo Masuda and Laboratório Integrado de Morfologia, NUPEM-UFRJ, Macaé, RJ, Brazil
| | - Gabriela Sabadin
- Centro de Biotecnologia and Faculdade de Veterinária - UFRGS, Porto Alegre, RS, Brazil
| | - Satoru Konnai
- Laboratory of Infectious Diseases, Hokkaido University, Sapporo, 060-0818, Japan
| | | | - Kazuhiko Ohashi
- Laboratory of Infectious Diseases, Hokkaido University, Sapporo, 060-0818, Japan
| | - Carlos Logullo
- Laboratório Integrado de Bioquímica Hatisaburo Masuda and Laboratório Integrado de Morfologia, NUPEM-UFRJ, Macaé, RJ, Brazil.
- Instituto de Bioquímica Médica Leopoldo de Meis, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
- Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, Rio de Janeiro, RJ, Brazil.
| |
Collapse
|
19
|
Qiao Y, Zhao R, Zhang M, Zhang H, Wang Y, Hu P. Phenylboronic acid derivative-modified (6,5) single-wall carbon nanotube probes for detecting glucose and hydrogen peroxide. RSC Adv 2019; 9:2258-2267. [PMID: 35516097 PMCID: PMC9059849 DOI: 10.1039/c8ra09272a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 12/21/2018] [Indexed: 11/21/2022] Open
Abstract
In this paper, we presented a new method for constructing near-infrared fluorescence probes and their applications in detecting glucose and hydrogen peroxide (H2O2).
Collapse
Affiliation(s)
- Yunfan Qiao
- Shanghai Key Laboratory of Functional Materials Chemistry
- School of Chemistry and Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Rushi Zhao
- Shanghai Key Laboratory of New Drug Design
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Min Zhang
- Shanghai Key Laboratory of New Drug Design
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Hongyang Zhang
- Shanghai Key Laboratory of Functional Materials Chemistry
- School of Chemistry and Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Yuerong Wang
- Shanghai Key Laboratory of Functional Materials Chemistry
- School of Chemistry and Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Ping Hu
- Shanghai Key Laboratory of Functional Materials Chemistry
- School of Chemistry and Molecular Engineering
- East China University of Science and Technology
- Shanghai 200237
- China
| |
Collapse
|
20
|
Nordzieke DE, Medraño-Fernandez I. The Plasma Membrane: A Platform for Intra- and Intercellular Redox Signaling. Antioxidants (Basel) 2018; 7:antiox7110168. [PMID: 30463362 PMCID: PMC6262572 DOI: 10.3390/antiox7110168] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 11/15/2018] [Accepted: 11/17/2018] [Indexed: 02/06/2023] Open
Abstract
Membranes are of outmost importance to allow for specific signal transduction due to their ability to localize, amplify, and direct signals. However, due to the double-edged nature of reactive oxygen species (ROS)—toxic at high concentrations but essential signal molecules—subcellular localization of ROS-producing systems to the plasma membrane has been traditionally regarded as a protective strategy to defend cells from unwanted side-effects. Nevertheless, specialized regions, such as lipid rafts and caveolae, house and regulate the activated/inhibited states of important ROS-producing systems and concentrate redox targets, demonstrating that plasma membrane functions may go beyond acting as a securing lipid barrier. This is nicely evinced by nicotinamide adenine dinucleotide phosphate (NADPH)-oxidases (NOX), enzymes whose primary function is to generate ROS and which have been shown to reside in specific lipid compartments. In addition, membrane-inserted bidirectional H2O2-transporters modulate their conductance precisely during the passage of the molecules through the lipid bilayer, ensuring time-scaled delivery of the signal. This review aims to summarize current evidence supporting the role of the plasma membrane as an organizing center that serves as a platform for redox signal transmission, particularly NOX-driven, providing specificity at the same time that limits undesirable oxidative damage in case of malfunction. As an example of malfunction, we explore several pathological situations in which an inflammatory component is present, such as inflammatory bowel disease and neurodegenerative disorders, to illustrate how dysregulation of plasma-membrane-localized redox signaling impacts normal cell physiology.
Collapse
Affiliation(s)
- Daniela E Nordzieke
- Institute of Microbiology and Genetics, Department of Genetics of Eukaryotic Microorganisms, Georg August University Göttingen, Grisebachstr. 8, D-37077 Göttingen, Germany.
| | - Iria Medraño-Fernandez
- Protein Transport and Secretion Unit, Division of Genetics and Cell Biology, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Ospedale San Raffaele, Università Vita-Salute San Raffaele, 20132 Milan, Italy.
| |
Collapse
|
21
|
Scalcon V, Bindoli A, Rigobello MP. Significance of the mitochondrial thioredoxin reductase in cancer cells: An update on role, targets and inhibitors. Free Radic Biol Med 2018; 127:62-79. [PMID: 29596885 DOI: 10.1016/j.freeradbiomed.2018.03.043] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/21/2018] [Accepted: 03/24/2018] [Indexed: 12/26/2022]
Abstract
Thioredoxin reductase 2 (TrxR2) is a key component of the mitochondrial thioredoxin system able to transfer electrons to peroxiredoxin 3 (Prx3) in a reaction mediated by thioredoxin 2 (Trx2). In this way, both the level of hydrogen peroxide and thiol redox state are modulated. TrxR2 is often overexpressed in cancer cells conferring apoptosis resistance. Due to their exposed flexible arm containing selenocysteine, both cytosolic and mitochondrial TrxRs are inhibited by a large number of molecules. The various classes of inhibitors are listed and the molecules acting specifically on TrxR2 are extensively described. Particular emphasis is given to gold(I/III) complexes with phosphine, carbene or other ligands and to tamoxifen-like metallocifens. Also chemically unrelated organic molecules, including natural compounds and their derivatives, are taken into account. An important feature of many TrxR2 inhibitors is provided by their nature of delocalized lipophilic cations that allows their accumulation in mitochondria exploiting the organelle membrane potential. The consequences of TrxR2 inhibition are presented focusing especially on the impact on mitochondrial pathophysiology. Inhibition of TrxR2, by hindering the activity of Trx2 and Prx3, increases the mitochondrial concentration of reactive oxygen species and shifts the thiol redox state toward a more oxidized condition. This is reflected by alterations of specific targets involved in the release of pro-apoptotic factors such as cyclophilin D which acts as a regulator of the mitochondrial permeability transition pore. Therefore, the selective inhibition of TrxR2 could be utilized to induce cancer cell apoptosis.
Collapse
Affiliation(s)
- Valeria Scalcon
- Department of Biomedical Sciences, University of Padova, Via Ugo Bassi 58/b, 35131 Padova, Italy.
| | - Alberto Bindoli
- Department of Biomedical Sciences, University of Padova, Via Ugo Bassi 58/b, 35131 Padova, Italy; Institute of Neuroscience (CNR), Padova Section, c/o Department of Biomedical Sciences, Viale G. Colombo 3, 35131 Padova, Italy
| | - Maria Pia Rigobello
- Department of Biomedical Sciences, University of Padova, Via Ugo Bassi 58/b, 35131 Padova, Italy.
| |
Collapse
|
22
|
Zhang Q, Reinhard BM. Ligand Density and Nanoparticle Clustering Cooperate in the Multivalent Amplification of Epidermal Growth Factor Receptor Activation. ACS NANO 2018; 12:10473-10485. [PMID: 30289688 PMCID: PMC6252274 DOI: 10.1021/acsnano.8b06141] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Multivalent presentation of ligands on nanoparticles (NPs) is considered a general strategy for enhancing receptor binding and activation through amplification of ligand-receptor interactions within the footprint of the individual NPs. The spatial clustering of ligand-functionalized NPs represents an additional, less well understood mechanism for increasing local ligand-receptor interactions, especially for receptors that form higher-order assemblies, such as the epidermal growth factor (EGF) receptor (EGFR). To shed light on the interplay between ligand density ( i.e., multivalency) and NP clustering in signal amplification, we apply EGF-functionalized 72 ± 1 nm gold nanoparticles (NP-EGF) with known ligand loading (10-200 EGF/NP) as quantifiable and experimentally tractable units of EGFR activation and characterize the NP-mediated amplification of EGFR phosphorylation as a function of both EGF surface density and NP-EGF clustering for two cancer cell lines (HeLa and MDA-MB-468). The measurements confirm a strong multivalent amplification of EGFR phosphorylation through NP-EGF on the cellular level that results in EGF-loading-dependent maximum EGFR phosphorylation levels. A microscopic analysis of NP-EGF-induced EGFR phosphorylation reveals a heterogeneous spatial distribution of EGFR activation across the cell surface. Clustering of multivalent NP-EGF on sub-diffraction-limited length scales is found to result in a local enhancement of EGFR phosphorylation in signaling "hot spots" from where the signal can spread laterally in an EGF-independent fashion. Increasing EGF loadings of the NP enhances NP-EGF clustering and intensifies EGFR phosphorylation. These observations suggest that NP-EGF clustering and the associated local enhancement of ligand-receptor interactions are intrinsic components of the multivalent amplification of phosphorylation for the heterogeneously distributed EGFR through NP-EGF.
Collapse
Affiliation(s)
- Qianyun Zhang
- Department of Chemistry and The Photonics Center , Boston University , Boston , Massachusetts 02215 , United States
| | - Björn M Reinhard
- Department of Chemistry and The Photonics Center , Boston University , Boston , Massachusetts 02215 , United States
| |
Collapse
|
23
|
|
24
|
Chen J, Shu Y, Li H, Xu Q, Hu X. Nickel metal-organic framework 2D nanosheets with enhanced peroxidase nanozyme activity for colorimetric detection of H 2O 2. Talanta 2018; 189:254-261. [PMID: 30086915 DOI: 10.1016/j.talanta.2018.06.075] [Citation(s) in RCA: 109] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 06/14/2018] [Accepted: 06/24/2018] [Indexed: 12/28/2022]
Abstract
A two-dimensional (2D) Ni based metal-organic framework (MOF) nanosheets were synthesized using a one-step solvent-thermal method. The as-prepared nanosheets were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), powder X-ray diffraction (XRD) and energy disperse spectroscopy (EDS) mapping. Ni-MOF nanosheet was first time found to used as a peroxidase mimetic with catalytic activities and could catalyze the oxidation of the substrate 3,3,5,5-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H2O2). Catalytic mechanism analysis suggested the enzymatic kinetics of Ni-MOF nanosheets followed typical Michaelis-Menten theory and Ni-MOF nanosheets possess a higher affinity for two substrates (TMB and H2O2) than horseradish peroxidase (HRP). Furthermore, Ni-MOF nanosheet was applied to establish an H2O2 colorimetric sensor which deserves a wide linear range of 0.04 ~ 160 μM and a low detection limit of 8 nM. Also the application of this sensor for H2O2 detection in human serum and disinfectant was demonstrated and satisfactory results were obtained. Thus, the simple and sensitive Ni-MOF/TMB/H2O2 colorimetric system has great promising applications in clinical medicine and food environment analysis.
Collapse
Affiliation(s)
- Jingyuan Chen
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Yun Shu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| | - Huilei Li
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Qin Xu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China
| | - Xiaoya Hu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China.
| |
Collapse
|
25
|
Sakanyan V. Reactive Chemicals and Electrophilic Stress in Cancer: A Minireview. High Throughput 2018; 7:ht7020012. [PMID: 29702613 PMCID: PMC6023294 DOI: 10.3390/ht7020012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 04/19/2018] [Accepted: 04/26/2018] [Indexed: 12/11/2022] Open
Abstract
Exogenous reactive chemicals can impair cellular homeostasis and are often associated with the development of cancer. Significant progress has been achieved by studying the macromolecular interactions of chemicals that possess various electron-withdrawing groups and the elucidation of the protective responses of cells to chemical interventions. However, the formation of electrophilic species inside the cell and the relationship between oxydative and electrophilic stress remain largely unclear. Derivatives of nitro-benzoxadiazole (also referred as nitro-benzofurazan) are potent producers of hydrogen peroxide and have been used as a model to study the generation of reactive species in cancer cells. This survey highlights the pivotal role of Cu/Zn superoxide dismutase 1 (SOD1) in the production of reactive oxygen and electrophilic species in cells exposed to cell-permeable chemicals. Lipophilic electrophiles rapidly bind to SOD1 and induce stable and functionally active dimers, which produce excess hydrogen peroxide leading to aberrant cell signalling. Moreover, reactive oxygen species and reactive electrophilic species, simultaneously generated by redox reactions, behave as independent entities that attack a variety of proteins. It is postulated that the binding of the electrophilic moiety to multiple proteins leading to impairing different cellular functions may explain unpredictable side effects in patients undergoing chemotherapy with reactive oxygen species (ROS)-inducing drugs. The identification of proteins susceptible to electrophiles at early steps of oxidative and electrophilic stress is a promising way to offer rational strategies for dealing with stress-related malignant tumors.
Collapse
Affiliation(s)
- Vehary Sakanyan
- Faculté de Pharmacie, Faculté des Sciences et des Techniques, IICiMed, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France.
| |
Collapse
|
26
|
Lee SH, Suk K. Identification of glia phenotype modulators based on select glial function regulatory signaling pathways. Expert Opin Drug Discov 2018; 13:627-641. [DOI: 10.1080/17460441.2018.1465925] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Sun-Hwa Lee
- New Drug Development Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, Republic of Korea
| | - Kyoungho Suk
- Department of Pharmacology, Brain Science & Engineering Institute, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| |
Collapse
|
27
|
Khanehzar A, Fraire JC, Xi M, Feizpour A, Xu F, Wu L, Coronado EA, Reinhard BM. Nanoparticle-cell interactions induced apoptosis: a case study with nanoconjugated epidermal growth factor. NANOSCALE 2018; 10:6712-6723. [PMID: 29589623 PMCID: PMC6035871 DOI: 10.1039/c8nr01106k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
In addition to the intrinsic toxicity associated with the chemical composition of nanoparticles (NP) and their ligands, biofunctionalized NP can perturb specific cellular processes through NP-cell interactions and induce programmed cell death (apoptosis). In the case of the epidermal growth factor (EGF), nanoconjugation has been shown to enhance the apoptotic efficacy of the ligand, but the critical aspects of the underlying mechanism and its dependence on the NP morphology remain unclear. In this manuscript we characterize the apoptotic efficacy of nanoconjugated EGF as a function of NP size (with sphere diameters in the range 20-80 nm), aspect ratio (A.R., in the range of 4.5 to 8.6), and EGF surface loading in EGFR overexpressing MDA-MB-468 cells. We demonstrate a significant size and morphology dependence in this relatively narrow parameter space with spherical NP with a diameter of approx. 80 nm being much more efficient in inducing apoptosis than smaller spherical NP or rod-shaped NP with comparable EGF loading. The nanoconjugated EGF is found to trigger an EGFR-dependent increase in cytoplasmic reactive oxygen species (ROS) levels but no indications of increased mitochondrial ROS levels or mitochondrial membrane damage are detected at early time points of the apoptosis induction. The increase in cytoplasmic ROS is accompanied by a perturbation of the intracellular glutathione homeostasis, which represents an important check-point for NP-EGF mediated apoptosis. Abrogation of the oxidative stress through the inhibition of EGFR signaling by the EGFR inhibitor AG1478 or addition of antioxidants N-acetyl cysteine (NAC) or tempol, but not trolox, successfully suppressed the apoptotic effect of nanoconjugated EGF. A model to account for the observed morphology dependence of EGF nanoconjugation enhanced apoptosis and the underlying NP-cell interactions is discussed.
Collapse
Affiliation(s)
- Ali Khanehzar
- Department of Chemistry and the Photonics Center, Boston University, Boston, Massachusetts 02215, USA.
| | | | | | | | | | | | | | | |
Collapse
|
28
|
Ganapathy S, Peng B, Shen L, Yu T, Lafontant J, Li P, Xiong R, Makriyannis A, Chen C. Suppression of PKC causes oncogenic stress for triggering apoptosis in cancer cells. Oncotarget 2018; 8:30992-31002. [PMID: 28415683 PMCID: PMC5458183 DOI: 10.18632/oncotarget.16047] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 02/28/2017] [Indexed: 12/22/2022] Open
Abstract
Gain of functional mutations in ras occurs in more than 30% of human malignancies and in particular 90% of pancreatic cancer. Mutant ras, via activating multiple effector pathways, not only promote cell growth or survival, but also apoptosis, depending upon cell types or circumstances. In order to further study the mechanisms of apoptosis induced by oncogenic ras, we employed the ras loop mutant genes and demonstrated that Akt functioned downstream of Ras in human pancreatic cancer or HPNE cells ectopically expressing mutated K-ras for the induction of apoptosis after the concurrent suppression of PKC α and β. In this apoptotic process, the redox machinery was aberrantly switched on in the pancreatic cancer cells as well as prostate cancer DU145 cells. p73 was phosphorylated and translocated to the nucleus, accompanied with UPR activation and induction of apoptosis. The in vitro results were corroborated by the in vivo data. Thus, our study indicated that PKC α and β appeared coping with oncogenic Ras or mutated Akt to maintain the balance of the homeostasis in cancer cells. Once these PKC isoforms were suppressed, the redox state in the cancer cells was disrupted, which elicited persistent oncogenic stress and subsequent apoptotic crisis.
Collapse
Affiliation(s)
| | - Bo Peng
- Center for Drug Discovery, Northeastern University, Boston, MA, USA
| | - Ling Shen
- Center for Drug Discovery, Northeastern University, Boston, MA, USA
| | - Tianqi Yu
- Center for Drug Discovery, Northeastern University, Boston, MA, USA
| | - Jean Lafontant
- Center for Drug Discovery, Northeastern University, Boston, MA, USA
| | - Ping Li
- The First Affiliated Hospital, Zhengzhou University, Zhengzhou, China.,The Institute of Clinic Sciences, Sahlgrenska Academy, Gothenburg, Sweden
| | - Rui Xiong
- The Institute of Clinic Sciences, Sahlgrenska Academy, Gothenburg, Sweden
| | | | - Changyan Chen
- Center for Drug Discovery, Northeastern University, Boston, MA, USA
| |
Collapse
|
29
|
Recent advances in transition-metal dichalcogenides based electrochemical biosensors: A review. Biosens Bioelectron 2017; 97:305-316. [DOI: 10.1016/j.bios.2017.06.011] [Citation(s) in RCA: 236] [Impact Index Per Article: 33.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Revised: 05/25/2017] [Accepted: 06/07/2017] [Indexed: 11/22/2022]
|
30
|
Rodic S, Vincent MD. Reactive oxygen species (ROS) are a key determinant of cancer's metabolic phenotype. Int J Cancer 2017; 142:440-448. [PMID: 28940517 DOI: 10.1002/ijc.31069] [Citation(s) in RCA: 113] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 08/28/2017] [Accepted: 09/11/2017] [Indexed: 12/21/2022]
Abstract
Cancer cells exhibit a wide range of metabolic phenotypes, ranging from strict aerobic glycolysis to increased mitochondrial respiration. The cause and utility of this metabolic variation is poorly understood. Given that cancer cells experience heavy selection within their microenvironment, survival requires metabolic adaptation to both extracellular and intracellular conditions. Herein, we suggest that reactive oxygen species (ROS) are a key determinant of cancer's metabolic phenotype. Intracellular ROS levels can be modified by an assortment of critical parameters including oxygenation, glucose availability and growth factors. ROS act as integrators of environmental information as well as downstream effectors of signaling pathways. Maintaining ROS within a narrow range allows malignant cells to enhance growth and invasion while limiting their apoptotic susceptibility. Cancer cells actively modify their metabolism to optimize intracellular ROS levels and thereby improve survival. Furthermore, we highlight distinct metabolic phenotypes in response to oxidative stress and their tumorigenic drivers.
Collapse
Affiliation(s)
- Stefan Rodic
- Schulich School of Medicine and Dentistry, 1151 Richmond St, Western University, London, ON, Canada
| | - Mark David Vincent
- Schulich School of Medicine and Dentistry, 1151 Richmond St, Western University, London, ON, Canada.,Department of Medical Oncology, London Regional Cancer Program, 800 Commissioners Road East, London, ON, Canada
| |
Collapse
|
31
|
Wang J, Zhang Y, Archibong E, Ligler FS, Gu Z. Leveraging H 2 O 2 Levels for Biomedical Applications. ACTA ACUST UNITED AC 2017; 1:e1700084. [PMID: 32646189 DOI: 10.1002/adbi.201700084] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 05/31/2017] [Indexed: 12/21/2022]
Abstract
Hydrogen peroxide (H2 O2 )-responsive materials have been employed as drug delivery or diagnostic systems to treat or detect diseases with abnormal oxidative stress. A number of H2 O2 -responsive systems have been developed, and they have achieved great progress in controlled drug delivery for disease treatment. However, pathological sites with elevated H2 O2 level, such as cancer and inflammation, have their own characteristics; therefore the material structures and the subsequent formulations should be reasonably designed to acquire maximized therapeutic effects. In this progress report, we overview the development of H2 O2 -responsive functional groups for constructing H2 O2 -responsive formulations, as well as the guidance for designing suitable formulations to treat each specific pathological condition. The challenges and perspectives in this field are also discussed.
Collapse
Affiliation(s)
- Jinqiang Wang
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC, 27695, USA.,Division of Pharmacoengineering and Molecular Pharmaceutics and Center for Nanotechnology in Drug Delivery, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Yuqi Zhang
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC, 27695, USA.,Division of Pharmacoengineering and Molecular Pharmaceutics and Center for Nanotechnology in Drug Delivery, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Edikan Archibong
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC, 27695, USA.,Division of Pharmacoengineering and Molecular Pharmaceutics and Center for Nanotechnology in Drug Delivery, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Frances S Ligler
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC, 27695, USA
| | - Zhen Gu
- Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Raleigh, NC, 27695, USA.,Division of Pharmacoengineering and Molecular Pharmaceutics and Center for Nanotechnology in Drug Delivery, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.,Department of Medicine, University of North Carolina, School of Medicine, Chapel Hill, NC, 27599, USA
| |
Collapse
|
32
|
Bishayi B, Nandi A, Dey R, Adhikary R. Expression of CXCR1 (IL-8 receptor A) in splenic, peritoneal macrophages and resident bone marrow cells after acute live or heat killed Staphylococcus aureus stimulation in mice. Microb Pathog 2017; 109:131-150. [PMID: 28552636 DOI: 10.1016/j.micpath.2017.05.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 05/15/2017] [Accepted: 05/19/2017] [Indexed: 10/19/2022]
Abstract
Literature reveals that interaction with live Staphylococcus aureus (S. aureus) or heat killed S. aureus (HKSA) promotes secretion of CXCL-8 or interleukin-8 (IL-8) from leukocytes, however, the expressions of CXCR1 in murine splenic (SPM), peritoneal macrophages (PM) and resident fresh bone marrow cells (FBMC) have not been identified. Currently, very few studies are available on the functional characterization of CXCR1 in mouse macrophage subtypes and its modulation in relation to acute S. aureus infection. SPM, PM and FBMCs were infected with viable S. aureus or stimulated with HKSA in presence and absence of anti-CXCR1 antibody in this study. We reported here that CXCR1 was not constitutively expressed by macrophage subtypes and the receptor was induced only after S. aureus stimulation. The CXCR1 band was found specific as we compared with human polymorphonuclear neutrophils (PMNs) as a positive control (data not shown). Although, we did not show that secreted IL-8 from S. aureus-infected macrophages promotes migration of PMNs. Blocking of cell surface CXCR1 decreases the macrophage's ability to clear staphylococcal infection, attenuates proinflammatory cytokine production and the increased catalase and decreased superoxide dismutase (SOD) enzymes of the bacteria might indicate their role in scavenging macrophage derived hydrogen peroxide (H2O2). The decreased levels of cytokines due to CXCR1 blockade before S. aureus infection appear to regulate the killing of bacteria by destroying H2O2 and nitric oxide (NO). Moreover, functional importance of macrophage subpopulation heterogeneity might be important in designing new effective approaches to limit S. aureus infection induced inflammation and cytotoxicity.
Collapse
Affiliation(s)
- Biswadev Bishayi
- Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta 700009, West Bengal, India.
| | - Ajeya Nandi
- Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta 700009, West Bengal, India
| | - Rajen Dey
- Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta 700009, West Bengal, India
| | - Rana Adhikary
- Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta 700009, West Bengal, India
| |
Collapse
|
33
|
The synthesis of a lanthanum metal–organic framework and its sensitivity electrochemical detection of H2O2. CHEMICAL PAPERS 2017. [DOI: 10.1007/s11696-016-0011-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
34
|
Ganapathy S, Li P, Lafontant J, Xiong R, Yu T, Zhang G, Chen C. Chromium IV exposure, via Src/Ras signaling, promotes cell transformation. Mol Carcinog 2017; 56:1808-1815. [PMID: 28218450 DOI: 10.1002/mc.22639] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Revised: 02/13/2017] [Accepted: 02/16/2017] [Indexed: 01/01/2023]
Abstract
Hexavalent chromium [Cr(VI)] is a well-known environment carcinogen. The exposure of Cr(VI) through contaminated soil, air particles, and drinking water is a strong concern for the public health worldwide. While many studies have been done, it remains unclear which intracellular molecules transduce Cr(VI)-mediated carcinogenic signaling in cells to promote cancer. In this study, we demonstrated that upon Cr(VI) treatment, the intracellular receptor src was activated, which further upregulated Ras activity, leading to the augmentation of ROS and onset of ER stress in human lung epithelial BEAS-2B or keratinocytes. These cells were formed colonies in soft agar cultures following the persistent Cr(VI) treatment. Furthermore, anti-apoptotic factor Bcl-2 was upregulated and activated in the colonies. Thus, our study suggests that Cr(VI), though activating the src and Ras signaling axis, perturbs redox state and invokes ER stress for the establishment of carcinogenic actions in the cells. In this process, Bcl-2 appears playing an important role. By uncovering these intracellular targets, our study may help developing novel strategies for better environmental protection, especially in areas contaminated or polluted by Cr(VI) as well as for effective cancer treatments.
Collapse
Affiliation(s)
- Suthakar Ganapathy
- Center for Drug Development, Northeastern University, Boston, Massachusetts
| | - Ping Li
- The First Affiliated Hospital, Zhengzhou University, Zhengzhou, China.,The Institute of Clinic Sciences, Sahlgrenska Academy, Gothenburg, Sweden
| | - Jean Lafontant
- Center for Drug Development, Northeastern University, Boston, Massachusetts
| | - Rui Xiong
- The Institute of Clinic Sciences, Sahlgrenska Academy, Gothenburg, Sweden
| | - Tianqi Yu
- Center for Drug Development, Northeastern University, Boston, Massachusetts
| | - Guojun Zhang
- The First Affiliated Hospital, Zhengzhou University, Zhengzhou, China
| | - Changyan Chen
- Center for Drug Development, Northeastern University, Boston, Massachusetts
| |
Collapse
|
35
|
Luettich K, Talikka M, Lowe FJ, Haswell LE, Park J, Gaca MD, Hoeng J. The Adverse Outcome Pathway for Oxidative Stress-Mediated EGFR Activation Leading to Decreased Lung Function. ACTA ACUST UNITED AC 2017. [DOI: 10.1089/aivt.2016.0032] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Karsta Luettich
- Philip Morris International R&D, Philip Morris Products S.A. (Part of Philip Morris International Group of Companies), Neuchâtel, Switzerland
| | - Marja Talikka
- Philip Morris International R&D, Philip Morris Products S.A. (Part of Philip Morris International Group of Companies), Neuchâtel, Switzerland
| | - Frazer J. Lowe
- British American Tobacco (Investments) Ltd., Southampton, United Kingdom
| | - Linsey E. Haswell
- British American Tobacco (Investments) Ltd., Southampton, United Kingdom
| | | | - Marianna D. Gaca
- British American Tobacco (Investments) Ltd., Southampton, United Kingdom
| | - Julia Hoeng
- Philip Morris International R&D, Philip Morris Products S.A. (Part of Philip Morris International Group of Companies), Neuchâtel, Switzerland
| |
Collapse
|
36
|
Rijal G, Kim BS, Pati F, Ha DH, Kim SW, Cho DW. Robust tissue growth and angiogenesis in large-sized scaffold by reducing H
2
O
2
-mediated oxidative stress. Biofabrication 2017; 9:015013. [DOI: 10.1088/1758-5090/9/1/015013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
|
37
|
Xin Q, Liu Q, Shah H, Gong JR. Electron spin resonance and fluorescence imaging assisted electrochemical approach for accurate and comprehensive monitoring of cellular hydrogen peroxide dynamics. Analyst 2017; 142:316-325. [DOI: 10.1039/c6an02006b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new analytical system combining electrochemistry, ESR, and fluorescence imaging for accurately and comprehensively measuring the dynamics of cellular H2O2.
Collapse
Affiliation(s)
- Qi Xin
- CAS Center for Excellence in Nanoscience
- CAS Key Laboratory for Nanosystem and Hierarchical Fabrication
- National Center for Nanoscience and Technology
- Beijing 100190
- P. R. China
| | - Qian Liu
- CAS Center for Excellence in Nanoscience
- CAS Key Laboratory for Nanosystem and Hierarchical Fabrication
- National Center for Nanoscience and Technology
- Beijing 100190
- P. R. China
| | - Hameed Shah
- CAS Center for Excellence in Nanoscience
- CAS Key Laboratory for Nanosystem and Hierarchical Fabrication
- National Center for Nanoscience and Technology
- Beijing 100190
- P. R. China
| | - Jian Ru Gong
- CAS Center for Excellence in Nanoscience
- CAS Key Laboratory for Nanosystem and Hierarchical Fabrication
- National Center for Nanoscience and Technology
- Beijing 100190
- P. R. China
| |
Collapse
|
38
|
Shu Y, Chen J, Xu Q, Wei Z, Liu F, Lu R, Xu S, Hu X. MoS2 nanosheet–Au nanorod hybrids for highly sensitive amperometric detection of H2O2 in living cells. J Mater Chem B 2017; 5:1446-1453. [DOI: 10.1039/c6tb02886a] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
MoS2–Au hybrids were utilized to construct a sensitive H2O2 electrochemical biosensor for the determination of H2O2 released from living cells.
Collapse
Affiliation(s)
- Yun Shu
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- China
| | - Jingyuan Chen
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- China
| | - Qin Xu
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- China
| | - Zhen Wei
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- China
| | - Fengping Liu
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- China
| | - Rui Lu
- Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses
- School of Veterinary Medicine
- Yangzhou University
- Yangzhou 225002
- China
| | - Sheng Xu
- Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses
- School of Veterinary Medicine
- Yangzhou University
- Yangzhou 225002
- China
| | - Xiaoya Hu
- School of Chemistry and Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- China
| |
Collapse
|
39
|
Mutyala S, Mathiyarasu J. A reagentless non-enzymatic hydrogen peroxide sensor presented using electrochemically reduced graphene oxide modified glassy carbon electrode. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 69:398-406. [DOI: 10.1016/j.msec.2016.06.069] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 06/01/2016] [Accepted: 06/22/2016] [Indexed: 10/21/2022]
|
40
|
Murine macrophage response from peritoneal cavity requires signals mediated by chemokine receptor CCR-2 during Staphylococcus aureus infection. Immunol Res 2016; 64:213-32. [PMID: 26616292 DOI: 10.1007/s12026-015-8739-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
C-C chemokine receptor-2 (CCR-2) is a cognate receptor for monocyte chemotactic protein-1 (MCP-1), and recent studies revealed that MCP-1-CCR-2 signaling is involved in several inflammatory diseases characterized by macrophage infiltration. Currently, there is no study on the involvement of CCR-2 in the killing of S. aureus by macrophages of Swiss albino mice, and its substantial role in host defense against S. aureus infection in murine macrophages is still unclear. Therefore, the present study was aimed to investigate the functional and interactive role of CCR-2 and MCP-1 in regulating peritoneal macrophage responses with respect to acute S. aureus infection. We found that phagocytosis of S. aureus can serve as an important stimulus for MCP-1 production by peritoneal macrophages, which is dependent directly or indirectly on cytokines, reactive oxygen species and nitric oxide. Neutralization of CCR-2 in macrophages leads to increased production of IL-10 and decreased production of IFN-γ and IL-6. In CCR-2 blocked macrophages, pretreatment with specific blocker of NF-κB or p38-MAPK causes elevation in MCP-1 level and subsequent downregulation of CCR-2 itself. We speculate that CCR-2 is involved in S. aureus-induced MCP-1 production via NF-κB or p38-MAPK signaling. We also hypothesized that unnaturally high level of MCP-1 that build up upon CCR-2 neutralization might allow promiscuous binding to one or more other chemokine receptors, a situation that would not occur in CCR-2 non-neutralized condition. This may be the plausible explanation for such observed Th-2 response in CCR-2 blocked macrophages infected with S. aureus in the present study.
Collapse
|
41
|
Disulfiram anti-cancer efficacy without copper overload is enhanced by extracellular H2O2 generation: antagonism by tetrathiomolybdate. Oncotarget 2016; 6:29771-81. [PMID: 26356671 PMCID: PMC4745761 DOI: 10.18632/oncotarget.4833] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 07/27/2015] [Indexed: 12/24/2022] Open
Abstract
Highlights Background Cu/Zn superoxide dismutases (SODs) like the extracellular SOD3 and cytoplasmic SOD1 regulate cell proliferation by generating hydrogen peroxide (H2O2). This pro-oxidant inactivates essential cysteine residues in protein tyrosine phosphatases (PTP) helping receptor tyrosine kinase activation by growth factor signaling, and further promoting downstream MEK/ERK linked cell proliferation. Disulfiram (DSF), currently in clinical cancer trials is activated by copper chelation, being potentially capable of diminishing the copper dependent activation of MEK1/2 and SOD1/SOD3 and promoting reactive oxygen species (ROS) toxicity. However, copper (Cu) overload may occur when co-administered with DSF, resulting in toxicity and mutagenicity against normal tissue, through generation of the hydroxyl radical (•OH) by the Fenton reaction. Purpose To investigate: a) whether sub-toxic DSF efficacy can be increased without Cu overload against human melanoma cells with unequal BRAF(V600E) mutant status and Her2-overexpressing SKBR3 breast cancer cells, by increasing H2O2from exogenous SOD; b) to compare the anti-tumor efficacy of DSF with that of another clinically used copper chelator, tetrathiomolybdate (TTM) Results a) without copper supplementation, exogenous SOD potentiated sub-toxic DSF toxicity antagonized by sub-toxic TTM or by the anti-oxidant N-acetylcysteine; b) exogenous glucose oxidase, another H2O2 generator resembled exogenous SOD in potentiating sub-toxic DSF. Conclusions potentiation of sub-lethal DSF toxicity by extracellular H2O2 against the human tumor cell lines investigated, only requires basal Cu and increased ROS production, being unrelated to non-specific or TTM copper chelator sequestration. Significance These findings emphasize the relevance of extracellular H2O2 as a novel mechanism to improve disulfiram anticancer effects minimizing copper toxicity.
Collapse
|
42
|
Medraño-Fernandez I, Bestetti S, Bertolotti M, Bienert GP, Bottino C, Laforenza U, Rubartelli A, Sitia R. Stress Regulates Aquaporin-8 Permeability to Impact Cell Growth and Survival. Antioxid Redox Signal 2016; 24:1031-44. [PMID: 26972385 PMCID: PMC4931348 DOI: 10.1089/ars.2016.6636] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
UNLABELLED Aquaporin-8 (AQP8) allows the bidirectional transport of water and hydrogen peroxide across biological membranes. Depending on its concentration, H2O2 exerts opposite roles, amplifying growth factor signaling in physiological conditions, but causing severe cell damage when in excess. Thus, H2O2 permeability is likely to be tightly controlled in living cells. AIMS In this study, we investigated whether and how the transport of H2O2 through plasma membrane AQP8 is regulated, particularly during cell stress. RESULTS We show that diverse cellular stress conditions, including heat, hypoxia, and ER stress, reversibly inhibit the permeability of AQP8 to H2O2 and water. Preventing the accumulation of intracellular reactive oxygen species (ROS) during stress counteracts AQP8 blockade. Once inhibition is established, AQP8-dependent transport can be rescued by reducing agents. Neither H2O2 nor water transport is impaired in stressed cells expressing a mutant AQP8, in which cysteine 53 had been replaced by serine. Cells expressing this mutant are more resistant to stress-, drug-, and radiation-induced growth arrest and death. INNOVATION AND CONCLUSION The control of AQP8-mediated H2O2 transport provides a novel mechanism to regulate cell signaling and survival during stress. Antioxid. Redox Signal. 24, 1031-1044.
Collapse
Affiliation(s)
- Iria Medraño-Fernandez
- 1 Protein Transport and Secretion Unit, Division of Genetics and Cell Biology, IRCCS Ospedale San Raffaele/Università Vita-Salute San Raffaele , Milan, Italy
| | - Stefano Bestetti
- 1 Protein Transport and Secretion Unit, Division of Genetics and Cell Biology, IRCCS Ospedale San Raffaele/Università Vita-Salute San Raffaele , Milan, Italy
| | - Milena Bertolotti
- 1 Protein Transport and Secretion Unit, Division of Genetics and Cell Biology, IRCCS Ospedale San Raffaele/Università Vita-Salute San Raffaele , Milan, Italy
| | - Gerd P Bienert
- 2 Metalloid Transport Group, Leibniz Institute of Plant Genetics and Crop Plant Research , Gatersleben, Germany
| | - Cinzia Bottino
- 3 Department of Molecular Medicine, University of Pavia , Pavia, Italy
| | - Umberto Laforenza
- 3 Department of Molecular Medicine, University of Pavia , Pavia, Italy
| | - Anna Rubartelli
- 4 Cell Biology Unit, IRCCS AOU San Martino-IST , Genoa, Italy
| | - Roberto Sitia
- 1 Protein Transport and Secretion Unit, Division of Genetics and Cell Biology, IRCCS Ospedale San Raffaele/Università Vita-Salute San Raffaele , Milan, Italy
| |
Collapse
|
43
|
Dong X, Zhang Z, Zhao J, Lei J, Chen Y, Li X, Chen H, Tian J, Zhang D, Liu C, Liu C. The rational design of specific SOD1 inhibitors via copper coordination and their application in ROS signaling research. Chem Sci 2016; 7:6251-6262. [PMID: 30034766 PMCID: PMC6024207 DOI: 10.1039/c6sc01272h] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 06/15/2016] [Indexed: 12/12/2022] Open
Abstract
Efficient methods for the regulation of intracellular O2˙- and H2O2 levels, without altering intracellular processes, are urgently required for the rapidly growing interest in ROS signaling, as ROS signaling has been confirmed to be involved in a series of basic cellular processes including proliferation, differentiation, growth and migration. Intracellular H2O2 is formed mainly via the catalytic dismutation of O2˙- by SODs including SOD1, SOD2 and SOD3. Thus, the intracellular levels of O2˙- and H2O2 can directly be controlled through regulating SOD1 activity. Here, based on the active site structure and catalytic mechanism of SOD1, we developed a new type of efficient and specific SOD1 inhibitors which can directly change the intracellular levels of H2O2 and O2˙-. These inhibitors inactivate intracellular SOD1 via localization into the SOD1 active site, thereby coordinating to the Cu2+ in the active site of SOD1, blocking the access of O2˙- to Cu2+, and breaking the Cu2+/Cu+ catalytic cycle essential for O2˙- dismutation. The reduced ERK1/2 phosphorylation induced by the specific SOD1 inactivation-mediated decrease of intracellular H2O2 levels reveals the potential of these specific SOD1 inhibitors in understanding and regulating ROS signaling. Furthermore, these specific SOD1 inhibitors also lead to selectively elevated cancer cell apoptosis, indicating that these kinds of SOD1 inhibitors might be candidates for lead compounds for cancer treatment.
Collapse
Affiliation(s)
- Xiongwei Dong
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Zhe Zhang
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Jidong Zhao
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Juan Lei
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Yuanyuan Chen
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Xiang Li
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Huanhuan Chen
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Junli Tian
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Dan Zhang
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Chunrong Liu
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| | - Changlin Liu
- Key Laboratory of Pesticide & Chemical Biology , Ministry of Education , School of Chemistry , Central China Normal University , Wuhan 430079 , Hubei , China . ;
| |
Collapse
|
44
|
Sakanyan V, Hulin P, Alves de Sousa R, Silva VAO, Hambardzumyan A, Nedellec S, Tomasoni C, Logé C, Pineau C, Roussakis C, Fleury F, Artaud I. Activation of EGFR by small compounds through coupling the generation of hydrogen peroxide to stable dimerization of Cu/Zn SOD1. Sci Rep 2016; 6:21088. [PMID: 26883293 PMCID: PMC4756678 DOI: 10.1038/srep21088] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 01/14/2016] [Indexed: 11/09/2022] Open
Abstract
Activation of cell signaling by reactive chemicals and pollutants is an important issue for human health. It has been shown that lipophilic nitro-benzoxadiazole (NBD) compounds rapidly move across the plasma membrane and enhance Epidermal Growth Factor Receptor (EGFR) tyrosine phosphorylation in cancer cells. Unlike ligand-dependent activation, the mechanism of this induction relies on the generation of hydrogen peroxide, which is involved in the activation of the catalytic site of the receptor and the inactivation of protein tyrosine phosphatase PTP-1B. Production of H2O2 during redox transformation of NBD compounds is associated with the transition of a monomeric form of Cu/Zn superoxide dismutase 1 (SOD1) to stable dimers. The highly stable and functionally active SOD1 dimer, in the absence of adequate activities in downstream reactions, promotes the disproportionate production and accumulation of intracellular hydrogen peroxide shortly after exposure to NBD compounds. The intrinsic fluorescence of small compounds was used to demonstrate their binding to SOD1. Our data indicate that H2O2 and concomitantly generated electrophilic intermediates behave as independent entities, but all contribute to the biological reactivity of NBD compounds. This study opens a promising path to identify new biomarkers of oxidative/electrophilic stress in the progression of cancer and other diseases.
Collapse
Affiliation(s)
- Vehary Sakanyan
- IICiMed EA-1155, Faculté de Pharmacie, Faculté des Sciences et des Techniques, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France.,ProtNeteomix, 29 rue de Provence, 44700 Orvault, France
| | - Philippe Hulin
- Plate-forme MicroPICell SFR Santé F. Bonamy-FED 4203/Inserm UMS016/CNRS UMS3556, 44007 Nantes, France
| | - Rodolphe Alves de Sousa
- UMR 8601, CNRS, Université Paris Descartes, PRES Paris cité, 45 rue des Saints-Pères, 75270 Paris Cedex06, France
| | - Viviane A O Silva
- UFIP CNRS UMR 6286, Mechanism and Regulation of DNA Repair team, Faculté des Sciences et des Techniques, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
| | | | - Steven Nedellec
- Plate-forme MicroPICell SFR Santé F. Bonamy-FED 4203/Inserm UMS016/CNRS UMS3556, 44007 Nantes, France
| | - Christophe Tomasoni
- IICiMed EA-1155, Faculté de Pharmacie, Faculté des Sciences et des Techniques, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
| | - Cédric Logé
- IICiMed EA-1155, Faculté de Pharmacie, Faculté des Sciences et des Techniques, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
| | - Charles Pineau
- Protim, Inserm U1085-Irset, Campus de Beaulieu, 35042 Rennes, France
| | - Christos Roussakis
- IICiMed EA-1155, Faculté de Pharmacie, Faculté des Sciences et des Techniques, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
| | - Fabrice Fleury
- UFIP CNRS UMR 6286, Mechanism and Regulation of DNA Repair team, Faculté des Sciences et des Techniques, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
| | - Isabelle Artaud
- UMR 8601, CNRS, Université Paris Descartes, PRES Paris cité, 45 rue des Saints-Pères, 75270 Paris Cedex06, France
| |
Collapse
|
45
|
Nagano T, Mizuno M, Morita K, Nawa H. Pathological Implications of Oxidative Stress in Patients and Animal Models with Schizophrenia: The Role of Epidermal Growth Factor Receptor Signaling. Curr Top Behav Neurosci 2016; 29:429-446. [PMID: 26475158 DOI: 10.1007/7854_2015_399] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Proinflammatory cytokines perturb brain development and neurotransmission and are implicated in various psychiatric diseases, such as schizophrenia and depression. These cytokines often induce the production of reactive oxygen species (ROS) and regulate not only cell survival and proliferation but also inflammatory process and neurotransmission. Under physiological conditions, ROS are moderately produced in mitochondria but are rapidly scavenged by reducing agents in cells. However, brain injury, ischemia, infection, or seizure-like neural activities induce inflammatory cytokines and trigger the production of excessive amounts of ROS, leading to abnormal brain functions and psychiatric symptoms. Protein phosphatases, which are involved in the basal silencing of cytokine receptor activation, are the major targets of ROS. Consistent with this, several ROS scavengers, such as polyphenols and unsaturated fatty acids, attenuate both cytokine signaling and psychiatric abnormalities. In this review, we list the inducers, producers, targets, and scavengers of ROS in the brain and discuss the interaction between ROS and cytokine signaling implicated in schizophrenia and its animal models. In particular, we present an animal model of schizophrenia established by perinatal exposure to epidermal growth factor and illustrate the pathological role of ROS and antipsychotic actions of ROS scavengers, such as emodin and edaravone.
Collapse
Affiliation(s)
- Tadasato Nagano
- Faculty of Human Life Studies, University of Niigata Prefecture, 471 Ebigase, Higashi-ku, Niigata, 950-8680, Japan
| | - Makoto Mizuno
- Aichi Human Service Center, Institute for Developmental Research, Kasugai, Aichi, 480-0392, Japan
| | - Keisuke Morita
- Department of Molecular Biology, Brain Research Institute, Niigata University, Asahimachi-Dori 1-757, Niigata, 951-8585, Japan
| | - Hiroyuki Nawa
- Department of Molecular Biology, Brain Research Institute, Niigata University, Asahimachi-Dori 1-757, Niigata, 951-8585, Japan.
| |
Collapse
|
46
|
Xu J, Zhai J, Xu Y, Zhu J, Qin Y, Jiang D. A near-infrared fluorescent aza-bodipy probe for dual-wavelength detection of hydrogen peroxide in living cells. Analyst 2016; 141:2380-3. [DOI: 10.1039/c6an00262e] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A boronic acid functionalized aza-borondipyrromethene dye (azaBDPBA) was applied to the dual-wavelength detection of hydrogen peroxide with high selectivity, which was loaded into cells to indicate the alteration of intracellular hydrogen peroxide during biological processes.
Collapse
Affiliation(s)
- Jingjing Xu
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
- China
| | - Jingying Zhai
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
- China
| | - Yanmei Xu
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
- China
| | - Jingwei Zhu
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
- China
| | - Yu Qin
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
- China
| | - Dechen Jiang
- State Key Laboratory of Analytical Chemistry for Life Science
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing
- China
| |
Collapse
|
47
|
Dwivedi G, Gran MA, Bagchi P, Kemp ML. Dynamic Redox Regulation of IL-4 Signaling. PLoS Comput Biol 2015; 11:e1004582. [PMID: 26562652 PMCID: PMC4642971 DOI: 10.1371/journal.pcbi.1004582] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Accepted: 09/29/2015] [Indexed: 12/22/2022] Open
Abstract
Quantifying the magnitude and dynamics of protein oxidation during cell signaling is technically challenging. Computational modeling provides tractable, quantitative methods to test hypotheses of redox mechanisms that may be simultaneously operative during signal transduction. The interleukin-4 (IL-4) pathway, which has previously been reported to induce reactive oxygen species and oxidation of PTP1B, may be controlled by several other putative mechanisms of redox regulation; widespread proteomic thiol oxidation observed via 2D redox differential gel electrophoresis upon IL-4 treatment suggests more than one redox-sensitive protein implicated in this pathway. Through computational modeling and a model selection strategy that relied on characteristic STAT6 phosphorylation dynamics of IL-4 signaling, we identified reversible protein tyrosine phosphatase (PTP) oxidation as the primary redox regulatory mechanism in the pathway. A systems-level model of IL-4 signaling was developed that integrates synchronous pan-PTP oxidation with ROS-independent mechanisms. The model quantitatively predicts the dynamics of IL-4 signaling over a broad range of new redox conditions, offers novel hypotheses about regulation of JAK/STAT signaling, and provides a framework for interrogating putative mechanisms involving receptor-initiated oxidation. Incomplete reduction of oxygen during respiration results in the formation of highly reactive molecules known as reactive oxygen species (ROS) that react indiscriminately with cellular components and adversely affect cellular function. For a long time ROS were thought solely to be undesirable byproducts of respiration. Indeed, high levels of ROS are associated with a number of diseases. Despite these facts, antioxidants, agents that neutralize ROS, have not shown any clinical benefits when used as oral supplements. This paradox is partially explained by discoveries over the last two decades demonstrating that ROS are not always detrimental and may be essential for controlling physiological processes like cell signaling. However, the mechanisms by which ROS react with biomolecules are not well understood. In this work we have combined biological experiments with novel computational methods to identify the most important mechanisms of ROS-mediated regulation in the IL-4 signaling pathway of the immune system. We have also developed a detailed computer model of the IL-4 pathway and its regulation by ROS dependent and independent methods. Our work enhances the understanding of principles underlying regulation of cell signaling by ROS and has potential implications in advancing therapeutic methods targeting ROS and their adverse effects.
Collapse
Affiliation(s)
- Gaurav Dwivedi
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
| | - Margaret A. Gran
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
| | - Pritha Bagchi
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
| | - Melissa L. Kemp
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia, United States of America
- * E-mail:
| |
Collapse
|
48
|
Burgoyne JR, Rudyk O, Cho HJ, Prysyazhna O, Hathaway N, Weeks A, Evans R, Ng T, Schröder K, Brandes RP, Shah AM, Eaton P. Deficient angiogenesis in redox-dead Cys17Ser PKARIα knock-in mice. Nat Commun 2015; 6:7920. [PMID: 26258640 DOI: 10.1038/ncomms8920] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 06/24/2015] [Indexed: 02/05/2023] Open
Abstract
Angiogenesis is essential for tissue development, wound healing and tissue perfusion, with its dysregulation linked to tumorigenesis, rheumatoid arthritis and heart disease. Here we show that pro-angiogenic stimuli couple to NADPH oxidase-dependent generation of oxidants that catalyse an activating intermolecular-disulphide between regulatory-RIα subunits of protein kinase A (PKA), which stimulates PKA-dependent ERK signalling. This is crucial to blood vessel growth as 'redox-dead' Cys17Ser RIα knock-in mice fully resistant to PKA disulphide-activation have deficient angiogenesis in models of hind limb ischaemia and tumour-implant growth. Disulphide-activation of PKA represents a new therapeutic target in diseases with aberrant angiogenesis.
Collapse
Affiliation(s)
- Joseph R Burgoyne
- King's College London, Cardiovascular Division, The British Heart Foundation Centre of Excellence, The Rayne Institute, Saint Thomas' Hospital, London SE1 7EH, UK
| | - Olena Rudyk
- King's College London, Cardiovascular Division, The British Heart Foundation Centre of Excellence, The Rayne Institute, Saint Thomas' Hospital, London SE1 7EH, UK
| | - Hyun-Ju Cho
- King's College London, Cardiovascular Division, The British Heart Foundation Centre of Excellence, The Rayne Institute, Saint Thomas' Hospital, London SE1 7EH, UK
| | - Oleksandra Prysyazhna
- King's College London, Cardiovascular Division, The British Heart Foundation Centre of Excellence, The Rayne Institute, Saint Thomas' Hospital, London SE1 7EH, UK
| | - Natasha Hathaway
- King's College London, Cardiovascular Division, The British Heart Foundation Centre of Excellence, The Rayne Institute, Saint Thomas' Hospital, London SE1 7EH, UK
| | - Amanda Weeks
- King's College London, Division of Imaging Sciences, The Rayne Institute, Saint Thomas' Hospital, London SE1 7EH, UK
| | - Rachel Evans
- King's College London, Division of Cancer Studies, 2nd Floor, New Hunt's House, Guy's Medical School Campus, London SE1 1UL, UK
| | - Tony Ng
- King's College London, Division of Cancer Studies, 2nd Floor, New Hunt's House, Guy's Medical School Campus, London SE1 1UL, UK
| | - Katrin Schröder
- Institut für Kardiovaskuläre Physiologie, Goethe-Universität, Theodor-Stern Kai 7, 60590 Frankfurt, Germany
| | - Ralf P Brandes
- Institut für Kardiovaskuläre Physiologie, Goethe-Universität, Theodor-Stern Kai 7, 60590 Frankfurt, Germany
| | - Ajay M Shah
- King's College London, Cardiovascular Division, The British Heart Foundation Centre of Excellence, The James Black Centre, Denmark Hill Campus, 125 Coldharbour Lane, London SE5 9NU, UK
| | - Philip Eaton
- King's College London, Cardiovascular Division, The British Heart Foundation Centre of Excellence, The Rayne Institute, Saint Thomas' Hospital, London SE1 7EH, UK
| |
Collapse
|
49
|
Zuo L, Zhou T, Pannell BK, Ziegler AC, Best TM. Biological and physiological role of reactive oxygen species--the good, the bad and the ugly. Acta Physiol (Oxf) 2015; 214:329-48. [PMID: 25912260 DOI: 10.1111/apha.12515] [Citation(s) in RCA: 269] [Impact Index Per Article: 29.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2015] [Revised: 03/27/2015] [Accepted: 04/21/2015] [Indexed: 12/16/2022]
Abstract
Reactive oxygen species (ROS) are chemically reactive molecules that are naturally produced within biological systems. Research has focused extensively on revealing the multi-faceted and complex roles that ROS play in living tissues. In regard to the good side of ROS, this article explores the effects of ROS on signalling, immune response and other physiological responses. To review the potentially bad side of ROS, we explain the consequences of high concentrations of molecules that lead to the disruption of redox homeostasis, which induces oxidative stress damaging intracellular components. The ugly effects of ROS can be observed in devastating cardiac, pulmonary, neurodegenerative and other disorders. Furthermore, this article covers the regulatory enzymes that mitigate the effects of ROS. Glutathione peroxidase, superoxide dismutase and catalase are discussed in particular detail. The current understanding of ROS is incomplete, and it is imperative that future research be performed to understand the implications of ROS in various therapeutic interventions.
Collapse
Affiliation(s)
- L. Zuo
- Radiologic Sciences and Respiratory Therapy Division; School of Health and Rehabilitation Sciences; The Ohio State University College of Medicine; Columbus OH USA
- Biophysics Graduate Program; The Ohio State University; Columbus OH USA
| | - T. Zhou
- Radiologic Sciences and Respiratory Therapy Division; School of Health and Rehabilitation Sciences; The Ohio State University College of Medicine; Columbus OH USA
- Biophysics Graduate Program; The Ohio State University; Columbus OH USA
| | - B. K. Pannell
- Radiologic Sciences and Respiratory Therapy Division; School of Health and Rehabilitation Sciences; The Ohio State University College of Medicine; Columbus OH USA
| | - A. C. Ziegler
- Radiologic Sciences and Respiratory Therapy Division; School of Health and Rehabilitation Sciences; The Ohio State University College of Medicine; Columbus OH USA
| | - T. M. Best
- Division of Sports Medicine; Department of Family Medicine; Sports Health & Performance Institute; The Ohio State University Wexner Medical Center; Columbus OH USA
| |
Collapse
|
50
|
Bishayi B, Bandyopadhyay D, Majhi A, Adhikary R. Effect of exogenous MCP-1 on TLR-2 neutralized murine macrophages and possible mechanisms of CCR-2/TLR-2 and MCP-1 signalling during Staphylococcus aureus infection. Immunobiology 2014; 220:350-62. [PMID: 25454805 DOI: 10.1016/j.imbio.2014.10.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 10/07/2014] [Accepted: 10/12/2014] [Indexed: 12/16/2022]
Abstract
It has been reported that Staphylococcus aureus survives within macrophages by hijacking host cell surface Toll-like receptor-2 (TLR-2). Moreover, S. aureus infection induced activation of TLR-2 has been reported to downregulate the expression of CC-chemokine receptor-2 (CCR-2), a receptor essential for binding of chemokines to propagate phagocytosis. Thus, we hypothesized that prior blocking of TLR-2 may help normal expression of CCR-2 on cell surface; thereby, administration of exogenous MCP-1 (a CCR-2 ligand) to bind to its free receptors might result in activation of downstream inflammatory signalling cascade. In order to address this, we compared the ability of S. aureus to modulate CCR-2 expression in TLR-2 free or neutralized macrophages in presence or absence of exogenous MCP-1 and associated downstream signalling. Exogenous MCP-1 by interacting CCR-2 leads to the release of nitric oxide and ROS that are important for bacterial clearance. In this experimental setup, the possible molecular pathway connecting an increase in proinflammatory cytokine levels with increased ROS/NO production, and therefore increased killing activity, possibly by involving either MyD88 dependent or RhoA GTPases dependent NF-κB activation or endogenous synthesis of MCP-1, independent of TLR-2-MyD88 pathway. Thus, induction of CCR-2/MCP-1 signalling by macrophages depending on the availability of MCP-1 during S. aureus infection may be important for regulation of septic shock by induction of reactive oxygen species and various cytokines.
Collapse
Affiliation(s)
- Biswadev Bishayi
- Department of Physiology, Immunology laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta 700009, West Bengal, India.
| | - Debasish Bandyopadhyay
- Department of Physiology, Oxidative Stress and Free Radical Biology Laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta 700009, West Bengal, India
| | - Arnab Majhi
- Department of Physiology, Immunology laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta 700009, West Bengal, India
| | - Rana Adhikary
- Department of Physiology, Immunology laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta 700009, West Bengal, India
| |
Collapse
|