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Sharma A, Khan MA, Tirpude NV. Leupeptin maintains redox homeostasis via targeting ROS-autophagy-inflammatory axis in LPS-stimulated macrophages and cytokines dichotomy in Con-A challenged lymphocyte. Peptides 2023; 168:171066. [PMID: 37499907 DOI: 10.1016/j.peptides.2023.171066] [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: 03/27/2023] [Revised: 07/10/2023] [Accepted: 07/21/2023] [Indexed: 07/29/2023]
Abstract
Information regarding cellular anti-inflammatory and immunomodulatory attributes of leupeptin with respect to modulation of perturbed macrophage function and lymphocytes has not yet been delineated, particularly in the context of ROS-cytokines-autophagy-inflammatory signalling cascades. Therefore, the present study identified the attributes and mechanisms of leupeptin, from actinomycetes, in relation to excessive oxidative stress mediated disrupted immune homeostasis and inflammatory mechanism in activated macrophages and lymphocytes. Results revealed that leupeptin treatment showed noticeable inhibition in the production of NO, ROS, mitochondrial membrane potential and phagocytosis activity in LPS-stimulated macrophages. These findings were accompanied by reduction in TNF-α, IL-1β, IL-6, IFN-γ/IL-10 ratio, endopeptidases, oxidative effectors (Cox-2, IL-5, IL-15, IL-17, COX-2), iNOS with concomitant increase in Arg 1, Msr 1 and Mrc - 1exprssion in leupeptin treatment. Additionally, compared to LPS-challenged cells, marked alleviation in MDC, lysotracker staining, beclin-1, LC3B expression, and enhanced p62 levels in leupeptin exposed cells indicate the reversal of impaired autophagy flux. Subsequently, oxi-inflammatory signalling analysis demonstrated p-PTEN, p-NF-κB, p-PI3K, p-Akt, p-p38, and ERK1/2 upregulation decisively thwarted by leupeptin administration. In silico analysis further implied its target selectivity to these cascades. Furthermore, decreased proliferation index and Th1, Th2/IL-10 cytokines ratio in mitogen-challenged splenic lymphocytes confers its role in mitigating unwarranted inflammation mediated by disrupted regulation of adaptive immune cells. Together, these findings signify the attributes of leupeptin as an alternative anti-inflammatory strategy and affirm it as a promising natural entity to modulate immune-mediated response during inflammatory disorder.
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Affiliation(s)
- Anamika Sharma
- Dietetics and Nutrition Technology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, HP, India
| | - Mohd Adil Khan
- Dietetics and Nutrition Technology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, HP, India
| | - Narendra Vijay Tirpude
- Dietetics and Nutrition Technology Division, CSIR-Institute of Himalayan Bioresource Technology, Palampur, HP, India; Academy of Scientific and Innovative Research, Ghaziabad, UP, India.
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Perego F, Ticozzi RM, Troia A, Prato M, Taramelli D, Basilico N. Dextran-shelled oxygen-loaded nanodroplets modulate macrophages killing and inflammatory response to Enterococcus faecalis. Eur J Pharmacol 2022; 931:175161. [PMID: 35964657 DOI: 10.1016/j.ejphar.2022.175161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Revised: 07/13/2022] [Accepted: 07/19/2022] [Indexed: 11/03/2022]
Abstract
Chronic wounds are associated with inflammation, infections, and hypoxic environment. Macrophages play a crucial role in wound healing removing bacteria and secreting signal molecules to coordinate tissue repair. Recently, dextran-shelled Oxygen-Loaded NanoDroplets (OLNDs) have been proposed as new tools to counteract hypoxia in chronic wounds. Here we investigated the effects of OLNDs on Enterococcus faecalis (E. faecalis) killing and the secretion of inflammatory and angiogenic factors by murine (BMDM) and human (dTHP-1, differentiated THP-1) macrophages, in normoxia and hypoxia. Both OLNDs and Oxygen-Free NanoDroplets (OFNDs) significantly increased reactive oxygen species production by BMDM in normoxia (4.1 and 4 fold increase by 10% OLNDs and OFNDs, respectively, after 120 min) and hypoxia (3.8 and 4 fold increase by 10% OLNDs and OFNDs respectively) but not by dTHP-1. Moreover, only OLNDs induced nitric oxide secretion by BMDM in normoxia. Consequently, both nanodroplets improved E. faecalis killing by BMDM in normoxia (% of killing OLNDs = 44.2%; p < 0.01; OFNDs = 41.4%; p < 0.05) and hypoxia (% of killing OLNDs = 43.1%; p < 0.01; OFNDs = 37.7%; p < 0.05), while dTHP-1-mediated killing was not affected. The secretion of the inflammatory cytokines (TNFα, IL-6, IL-1β) induced by E. faecalis infection in dTHP-1 was reduced by both types of nanodroplets, suggesting a novel anti-inflammatory activity of the dextran shell. Instead, the increase of VEGF induced by hypoxia was reduced only by OLNDs. These data provide new knowledge on the effects of OLNDs as innovative adjuvant in chronic wounds healing promoting bacterial killing and reducing inflammation.
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Affiliation(s)
- Federica Perego
- Dipartimento di Scienze Biomediche, Chirurgiche e Odontoiatriche, Università degli Studi di Milano, via Pascal 36, 20133, Milano, Italy.
| | - Rosalia Maria Ticozzi
- Dipartimento di Scienze Biomediche, Chirurgiche e Odontoiatriche, Università degli Studi di Milano, via Pascal 36, 20133, Milano, Italy.
| | - Adriano Troia
- Istituto Nazionale di Ricerca Metrologica (INRIM), Strada delle Cacce 91, 10135, Torino, Italy.
| | - Mauro Prato
- Dipartimento di Neuroscienze, Università di Torino, Corso Raffaello 30, 10125, Torino, Italy.
| | - Donatella Taramelli
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, via Pascal 36, 20133, Milano, Italy.
| | - Nicoletta Basilico
- Dipartimento di Scienze Biomediche, Chirurgiche e Odontoiatriche, Università degli Studi di Milano, via Pascal 36, 20133, Milano, Italy.
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Cruz-Chamorro I, Santos-Sánchez G, Bollati C, Bartolomei M, Li J, Arnoldi A, Lammi C. Hempseed ( Cannabis sativa) Peptides WVSPLAGRT and IGFLIIWV Exert Anti-inflammatory Activity in the LPS-Stimulated Human Hepatic Cell Line. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:577-583. [PMID: 35007086 PMCID: PMC8778635 DOI: 10.1021/acs.jafc.1c07520] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 01/01/2022] [Indexed: 05/12/2023]
Abstract
WVSPLAGRT (H2) and IGFLIIWV (H3) are two transepithelial transported intestinal peptides obtained from the hydrolysis of hempseed protein with pepsin, which exert antioxidant activity in HepG2 cells. Notably, both peptides reduce the H2O2-induced reactive oxygen species, lipid peroxidation, and nitric oxide (NO) production levels in HepG2 cells via the modulation of the nuclear factor erythroid 2-related factor 2 and the inducible nitric oxide synthase (iNOS) pathways, respectively. Due to the close link between inflammation and oxidative stress and with the objective of fostering the multifunctional behavior of bioactive peptides, in this study, the molecular characterization of the anti-inflammatory and immunomodulatory properties of H2 and H3 was carried out in HepG2 cells. In fact, both peptides were shown to modulate the production of pro (IFN-γ: -33.0 ± 6.7% H2, p = 0.011; -13.1 ± 2.0% H3, p = <0.0001; TNF: -17.6 ± 1.7% H2, p = 0.0004; -20.3 ± 1.7% H3, p = <0.0001; and IL-6: -15.1 ± 6.5% H3, p = 0.010)- and anti (IL-10: +9.6 ± 3.1% H2, p = 0.010; +26.0 ± 2.3% H3, p = < 0.0001)-inflammatory cytokines and NO (-9.0 ± 0.7% H2, p = <0.0001; -7.2 ± 1.8% H3, p = <0.0001) through regulation of the NF-κB and iNOS pathways, respectively, in HepG2 cells stimulated by lipopolysaccharides.
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Affiliation(s)
- Ivan Cruz-Chamorro
- Department
of Pharmaceutical Sciences, University of
Milan, 20133 Milan, Italy
- Departamento
de Bioquímica Médica y Biología Molecular e Inmunología, Universidad de Sevilla, 41009 Seville, Spain
| | - Guillermo Santos-Sánchez
- Department
of Pharmaceutical Sciences, University of
Milan, 20133 Milan, Italy
- Departamento
de Bioquímica Médica y Biología Molecular e Inmunología, Universidad de Sevilla, 41009 Seville, Spain
| | - Carlotta Bollati
- Department
of Pharmaceutical Sciences, University of
Milan, 20133 Milan, Italy
| | - Martina Bartolomei
- Department
of Pharmaceutical Sciences, University of
Milan, 20133 Milan, Italy
| | - Jianqiang Li
- Department
of Pharmaceutical Sciences, University of
Milan, 20133 Milan, Italy
| | - Anna Arnoldi
- Department
of Pharmaceutical Sciences, University of
Milan, 20133 Milan, Italy
| | - Carmen Lammi
- Department
of Pharmaceutical Sciences, University of
Milan, 20133 Milan, Italy
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O’Dowd K, Sánchez L, Ben Salem J, Beaudry F, Barjesteh N. Characterization of the Role of Extracellular Vesicles Released from Chicken Tracheal Cells in the Antiviral Responses against Avian Influenza Virus. MEMBRANES 2021; 12:membranes12010053. [PMID: 35054579 PMCID: PMC8780788 DOI: 10.3390/membranes12010053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/24/2021] [Accepted: 12/26/2021] [Indexed: 11/16/2022]
Abstract
During viral respiratory infections, the innate antiviral response engages a complex network of cells and coordinates the secretion of key antiviral factors, such as cytokines, which requires high levels of regulation and communication. Extracellular vesicles (EVs) are particles released from cells that contain an array of biomolecules, including lipids, proteins, and RNAs. The contents of EVs can be influenced by viral infections and may play a role in the regulation of antiviral responses. We hypothesized that the contents of EVs released from chicken tracheal cells are influenced by viral infection and that these EVs regulate the function of other immune cells, such as macrophages. To this end, we characterized the protein profile of EVs during avian influenza virus (AIV) infection and evaluated the impact of EV stimulation on chicken macrophage functions. A total of 140 differentially expressed proteins were identified upon stimulation with various stimuli. These proteins were shown to be involved in immune responses and cell signaling pathways. In addition, we demonstrated that EVs can activate macrophages. These results suggest that EVs play a role in the induction and modulation of antiviral responses during viral respiratory infections in chickens.
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Affiliation(s)
- Kelsey O’Dowd
- Research Group on Infectious Diseases in Production Animals (GREMIP), Department of Pathology and Microbiology, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada;
- Swine and Poultry Infectious Disease Research Center (CRIPA), Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada;
| | - Laura Sánchez
- Swine and Poultry Infectious Disease Research Center (CRIPA), Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada;
| | - Jennifer Ben Salem
- Animal Pharmacology Research Group of Quebec (GREPAQ), Department of Veterinary Medicine, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (J.B.S.); (F.B.)
- Centre de Recherche sur le Cerveau et L’apprentissage (CIRCA), Université de Montréal, Montreal, QC J2S 2M2, Canada
| | - Francis Beaudry
- Animal Pharmacology Research Group of Quebec (GREPAQ), Department of Veterinary Medicine, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada; (J.B.S.); (F.B.)
- Centre de Recherche sur le Cerveau et L’apprentissage (CIRCA), Université de Montréal, Montreal, QC J2S 2M2, Canada
| | - Neda Barjesteh
- Research Group on Infectious Diseases in Production Animals (GREMIP), Department of Pathology and Microbiology, Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada;
- Swine and Poultry Infectious Disease Research Center (CRIPA), Faculty of Veterinary Medicine, Université de Montréal, Saint-Hyacinthe, QC J2S 2M2, Canada;
- Correspondence:
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Khallaf ISA, Bayoumi SAL, Malak LG, Hussein AMR, Mohammed AF, El-Mokhtar MA, Farag SF. The inhibition of inducible nitric oxide production in lipopolysaccharide-stimulated rat macrophages and in silico studies by flavonoids from Iris spuria L. rhizomes. JOURNAL OF ETHNOPHARMACOLOGY 2021; 278:114311. [PMID: 34111536 DOI: 10.1016/j.jep.2021.114311] [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: 10/08/2020] [Revised: 05/01/2021] [Accepted: 06/03/2021] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Iris is the largest genus in the family Iridaceae. Iris plants are distributed in tropical regions of the world. They are used as ornamentals and traditionally used to treat a variety of ailments. AIM This study aimed to evaluate the anti-inflammatory effect of flavonoids isolated from Iris spuria L. MATERIALS AND METHODS The isolated flavonoids (1-4) were identified on the basis of different spectroscopic methods (1D- and 2D-NMR) and co-TLC with authentic samples. The anti-inflammatory effect was tested on lipopolysaccharide (LPS)-induced nitric oxide (NO) production from rat-isolated peritoneal macrophages. Modeling and docking simulations of the compounds were performed using Molecular Operating Environment software and the crystal structure of the murine inducible nitric oxide synthase (iNOS). RESULTS Four flavonoids (1-4) had been isolated from the rhizomes of Iris spuria L. (Hocka Hoona) for the first time. They were characterized as 5,7,2'-trihydroxy-6-methoxyflavanone (1), tectorigenin 7-O-β-D-glucopyranoside (2), tectorigenin 4'-O-β-D-glucopyranoside (3), and tectorigenin 4'-O-[β-D-glucopyranosyl(1 → 6)-β-D-glucopyranoside] (4). The selective inducible NO synthase inhibitor; aminoguanidine was used as a positive control. The production of nitric oxide (NO) was inhibited in a dose-dependent manner of the isolated compounds along with isoflavonoids (5-9) previously isolated from Iris spuria L. (Calizona). A concentration of 60 μg/ml of all tested compounds showed a significant inhibitory effect compared to media with LPS. Molecular modeling experiments supported the obtained biological data. CONCLUSION Our results reveal that flavonoids isolated from I. spuria L. (Hocka Hoona) and I. spuria L. (Calizona) appear to have a potential anti-inflammatory effect via inhibition of iNOS.
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Affiliation(s)
- Iman S A Khallaf
- Pharmacognosy Department, Faculty of Pharmacy, Assiut University, Assiut, 71526, Egypt
| | - Soad A L Bayoumi
- Pharmacognosy Department, Faculty of Pharmacy, Assiut University, Assiut, 71526, Egypt.
| | - Lourin G Malak
- Pharmacognosy Department, Faculty of Pharmacy, Assiut University, Assiut, 71526, Egypt
| | - Abeer M R Hussein
- Pharmacology Department, Faculty of Medicine, Assiut University, Assiut, 71526, Egypt
| | - Anber F Mohammed
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Assiut University, Assiut, 71526, Egypt
| | - Mohamed A El-Mokhtar
- Medical Microbiology and Immunology Department, Faculty of Medicine, Assiut University, Assiut, 71526, Egypt
| | - Salwa F Farag
- Pharmacognosy Department, Faculty of Pharmacy, Assiut University, Assiut, 71526, Egypt; Pharmacognosy Department, College of Pharmacy, Taif University, Taif, Saudi Arabia
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Long D, Liu M, Li H, Song J, Jiang X, Wang G, Yang X. Dysbacteriosis induces abnormal neurogenesis via LPS in a pathway requiring NF-κB/IL-6. Pharmacol Res 2021; 167:105543. [PMID: 33711435 DOI: 10.1016/j.phrs.2021.105543] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/18/2021] [Accepted: 03/06/2021] [Indexed: 12/31/2022]
Abstract
In this study, we identified elevated levels of LPS and suppressed neurogenesis in a successfully established mouse model of gut microbiota dysbiosis. We mimicked these phenotypes using mouse and chicken embryos exposed to LPS and found that dramatic variation in gene expression was due to changes in the dorsal-ventral patterning of the neural tube. Cell survival and excess ROS were also involved in this process. Antioxidant administration alleviated LPS-activated NF-κB signaling, while directly blocking NF-κB signaling altered the LPS-induced inhibition of neurogenesis. Furthermore, IL-6 was proven to play a vital role in the expression of crucial neurogenesis-related genes and NF-κB. In summary, we found that the suppression of neurogenesis induced by dysbacteriosis-derived LPS was significantly reversed in mice with fecal microbiota transplantation. This study reveals that gut dysbacteriosis-derived LPS impairs embryonic neurogenesis, and that the NF-κB/IL-6 pathway could be one of the main factors triggering the downstream signaling cascade.
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Affiliation(s)
- Denglu Long
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan University, Guangzhou 510632, China; The First Affiliated Hospital of Jinan University, Guangzhou 510632, China
| | - Meng Liu
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan University, Guangzhou 510632, China
| | - Haiyang Li
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan University, Guangzhou 510632, China
| | - Jinhuan Song
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan University, Guangzhou 510632, China
| | - Xiaohua Jiang
- Key Laboratory for Regenerative Medicine of the Ministry of Education of China, School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR, China
| | - Guang Wang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan University, Guangzhou 510632, China; Key Laboratory for Regenerative Medicine of the Ministry of Education, Jinan University, Guangzhou 510632, China.
| | - Xuesong Yang
- Division of Histology and Embryology, International Joint Laboratory for Embryonic Development & Prenatal Medicine, Medical College, Jinan University, Guangzhou 510632, China; Key Laboratory for Regenerative Medicine of the Ministry of Education, Jinan University, Guangzhou 510632, China.
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7
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Koga M, Toda H, Kinoshita M, Asai F, Nagamine M, Shimizu K, Kobayashi Y, Morimoto Y, Yoshino A. Investigation of the impact of preconditioning with lipopolysaccharide on inflammation-induced gene expression in the brain and depression-like behavior in male mice. Prog Neuropsychopharmacol Biol Psychiatry 2020; 103:109978. [PMID: 32464240 DOI: 10.1016/j.pnpbp.2020.109978] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Revised: 05/19/2020] [Accepted: 05/19/2020] [Indexed: 11/21/2022]
Abstract
Although several recent studies have suggested that neuroinflammation plays a role in depression, both medication and neuroinflammatory preventive strategies have been poorly investigated. Recent studies have indicated that preconditioning with lipopolysaccharide (LPS) reduces the damage that occurs following ischemic stroke and brain trauma. However, to date, the effects of LPS preconditioning on psychiatric symptoms have not been reported. Thus, we assessed gene expression and behavioral changes affected by preconditioning with low-dose (LD) LPS in male mice with systemic inflammation induced by administration of high-dose (HD) LPS. mRNA expression analyses of cytokine-, glial-, and oxidative stress-associated genes revealed that majority of these genes responded to HD LPS. Differential gene expression in the presence and absence of LD LPS preconditioning, identified a subset of genes that may contribute to the mechanism of LPS preconditioning in the brain. Notably, LPS preconditioning attenuated an increase in expression of the astrocyte marker Gfap caused by systemic inflammation, suggesting that astrocytes have a key role in endotoxin tolerance in the brain induced by LPS preconditioning. As increased astrocyte in the brain of patients with depression is suggested to contribute to the pathophysiology of major depression, LPS preconditioning might be applicable to the prevention and treatment of depression. Unfortunately, in this study, LPS preconditioning did not show a reversal effect on behavior decline due to high-dose LPS-induced systemic inflammation. Alternative aspects of behavioral changes should be assessed to identify behavioral components that are affected by LPS preconditioning. Nonetheless, the findings in the present study indicate the possibility of the mechanism of endotoxin tolerance induction in the brain via astrocyte regulation by LPS preconditioning. Since there has been reported pharmacological significance of astrocytes in psychiatric disorders, regulation of endotoxin tolerance might be a key method to control psychiatric symptoms.
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Affiliation(s)
- Minori Koga
- Department of Psychiatry, National Defense Medical College, Saitama, Japan.
| | - Hiroyuki Toda
- Department of Psychiatry, National Defense Medical College, Saitama, Japan
| | - Manabu Kinoshita
- Department of Immunology and Microbiology, National Defense Medical College, Saitama, Japan
| | - Fumiho Asai
- Department of Psychiatry, National Defense Medical College, Saitama, Japan
| | - Masanori Nagamine
- Division of Behavioral Sciences, National Defense Medical College Research Institute, Saitama, Japan
| | - Kunio Shimizu
- Division of Behavioral Sciences, National Defense Medical College Research Institute, Saitama, Japan
| | - Yasushi Kobayashi
- Department of Anatomy and Neurobiology, National Defense Medical College, Saitama, Japan
| | - Yuji Morimoto
- Department of Integrative Physiology and Bio-Nano Medicine, National Defense Medical College, Saitama, Japan
| | - Aihide Yoshino
- Department of Psychiatry, National Defense Medical College, Saitama, Japan
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Leishmania mexicana: Novel Insights of Immune Modulation through Amastigote Exosomes. J Immunol Res 2020; 2020:8894549. [PMID: 33344659 PMCID: PMC7728480 DOI: 10.1155/2020/8894549] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 11/08/2020] [Accepted: 11/13/2020] [Indexed: 02/07/2023] Open
Abstract
Exosomes are extracellular microvesicles of endosomal origin (multivesicular bodies, MVBs) constitutively released by eukaryotic cells by fusion of MVBs to the plasma membrane. The exosomes from Leishmania parasites contain an array of parasite molecules such as virulence factors and survival messengers, capable of modulating the host immune response and thereby favoring the infection of the host. We here show that exosomes of L. mexicana amastigotes (aExo) contain the virulence proteins gp63 and PP2C. The incubation of aExo with bone marrow-derived macrophages (BMMs) infected with L. mexicana led to their internalization and were found to colocalize with the cellular tetraspanin CD63. Furthermore, aExo inhibited nitric oxide production of infected BMMs, permitting enhanced intracellular parasite survival. Expressions of antigen-presenting (major histocompatibility complex class I, MHC-I, and CD1d) and costimulatory (CD86 and PD-L1) molecules were modulated in a dose-dependent fashion. Whereas MHC-I, CD86 and PD-L1 expressions were diminished by exosomes, CD1d was enhanced. We conclude that aExo of L. mexicana are capable of decreasing microbicidal mechanisms of infected macrophages by inhibiting nitric oxide production, thereby enabling parasite survival. They also hamper the cellular immune response by diminishing MHC-I and CD86 on an important antigen-presenting cell, which potentially interferes with CD8 T cell activation. The enhanced CD1d expression in combination with reduction of PD-L1 on BMMs point to a potential shift of the activation route towards lipid presentations, yet the effectivity of this immune activation is not evident, since in the absence of costimulatory molecules, cellular anergy and tolerance would be expected.
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O’Brien J, Wendell SG. Electrophile Modulation of Inflammation: A Two-Hit Approach. Metabolites 2020; 10:metabo10110453. [PMID: 33182676 PMCID: PMC7696920 DOI: 10.3390/metabo10110453] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 11/04/2020] [Accepted: 11/05/2020] [Indexed: 12/11/2022] Open
Abstract
Electrophilic small molecules have gained significant attention over the last decade in the field of covalent drug discovery. Long recognized as mediators of the inflammatory process, recent evidence suggests that electrophiles may modulate the immune response through the regulation of metabolic networks. These molecules function as pleiotropic signaling mediators capable of reversibly reacting with nucleophilic biomolecules, most notably at reactive cysteines. More specifically, electrophiles target critical cysteines in redox regulatory proteins to activate protective pathways such as the nuclear factor erythroid 2-related factor 2-Kelch-like ECH-associated protein 1 (Nrf2-Keap1) antioxidant signaling pathway while also inhibiting Nuclear Factor κB (NF-κB). During inflammatory states, reactive species broadly alter cell signaling through the oxidation of lipids, amino acids, and nucleic acids, effectively propagating the inflammatory sequence. Subsequent changes in metabolic signaling inform immune cell maturation and effector function. Therapeutic strategies targeting inflammatory pathologies leverage electrophilic drug compounds, in part, because of their documented effect on the redox balance of the cell. With mounting evidence demonstrating the link between redox signaling and metabolism, electrophiles represent ideal therapeutic candidates for the treatment of inflammatory conditions. Through their pleiotropic signaling activity, electrophiles may be used strategically to both directly and indirectly target immune cell metabolism.
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10
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Thammason H, Khetkam P, Pabuprapap W, Suksamrarn A, Kunthalert D. Ethyl rosmarinate inhibits lipopolysaccharide-induced nitric oxide and prostaglandin E 2 production in alveolar macrophages. Eur J Pharmacol 2018; 824:17-23. [PMID: 29391157 DOI: 10.1016/j.ejphar.2018.01.042] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Revised: 01/21/2018] [Accepted: 01/25/2018] [Indexed: 12/20/2022]
Abstract
In this study, a series of rosmarinic acid and analogs were investigated for their anti-inflammatory potential against LPS-induced alveolar macrophages (MH-S). Our results showed that, among the test compounds, ethyl rosmarinate (3) exhibited the most potent inhibitory effect on NO production in LPS-induced MH-S cells, with low cytotoxicity. Compound 3 exhibited remarkable inhibition of the production of PGE2 in LPS-induced MH-S cells. The inhibitory potency of compound 3 against LPS-induced NO and PGE2 release was approximately two-fold higher than that of dexamethasone. Compound 3 significantly decreased the mRNA and protein expression of iNOS and COX-2 and suppressed p65 expression in the nucleus in LPS-induced MH-S cells. These results suggested that compound 3 inhibited NO and PGE2 production, at least in part, through the down-regulation of NF-κB activation. Analysis of structure-activity relationship revealed that the free carboxylic group did not contribute to inhibitory activity and that the alkyl group of the corresponding alkyl ester analogs produced a strong inhibitory effect. We concluded that compound 3, a structurally modified rosmarinic acid, possessed potent inhibitory activity against lung inflammation, which strongly supported the development of this compound as a novel therapeutic agent for the treatment of macrophage-mediated lung inflammatory diseases, such as COPD.
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Affiliation(s)
- Hathairat Thammason
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok 65000, Thailand
| | - Pichit Khetkam
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ramkhamhaeng University, Bangkok 10240, Thailand
| | - Wachirachai Pabuprapap
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ramkhamhaeng University, Bangkok 10240, Thailand
| | - Apichart Suksamrarn
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ramkhamhaeng University, Bangkok 10240, Thailand.
| | - Duangkamol Kunthalert
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok 65000, Thailand; Centre of Excellence in Medical Biotechnology, Faculty of Medical Science, Naresuan University, Phitsanulok 65000, Thailand.
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Radulović NS, Todorovska MM, Zlatković DB, Stojanović NM, Randjelović PJ. Two goitrogenic 1,3-oxazolidine-2-thione derivatives from Brassicales taxa: Challenging identification, occurrence and immunomodulatory effects. Food Chem Toxicol 2017; 110:94-108. [PMID: 29017835 DOI: 10.1016/j.fct.2017.10.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Revised: 10/01/2017] [Accepted: 10/05/2017] [Indexed: 01/04/2023]
Abstract
1,3-Oxazolidine-2-thione derivatives are glucosinolate-related food constituents known to impart (thyreo)toxic properties to some cruciferous vegetables. In this work, 5,5-dimethyl-1,3-oxazolidine-2-thione and (-)-(R)-5-phenyl-1,3-oxazolidine-2-thione, known goitrogens, were isolated from Draba lasiocarpa Rochel (Brassicaceae) and Reseda luteola L. (Resedaceae), respectively, and were fully spectrally characterized. Subsequently, the occurrence of the two 1,3-oxazolidine-2-thiones was verified in six additional taxa out of in total 78 screened Serbian Brassicales taxa. The stereochemistry of 5-phenyl-1,3-oxazolidine-2-thione was inferred from nuclear magnetic resonance experiments with a chiral lanthanide-shift reagent, employed in this work for the first time for this type of compounds. Unexpectedly, during gas chromatography, 5-phenyl-1,3-oxazolidine-2-thione underwent an unreported thermal core isomerization (1,3-oxazolidine-2-thione to 1,3-thiazolidine-2-one). These goitrogenic volatile glucosinolate products were tested for their effect on rat macrophage viability (three assays) and nitric oxide production. It was shown that the compounds displayed different levels of cytotoxicity. All tested compounds caused a significant lactate dehydrogenase leakage, but only (R)-5-phenyl-1,3-oxazolidine-2-thione statistically significantly reduced macrophage mitochondrial activity, whereas the racemic 5-phenyl-1,3-oxazolidine-2-thione and 5,5-dimethyl-1,3-oxazolidine-2-thione had little or no effect. Again only (R)-5-phenyl-1,3-oxazolidine-2-thione exerted nitric oxide production-inhibiting properties, suggesting the higher immunomodulatory potential of this enantiomer compared with its antipode and racemic mixture.
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Affiliation(s)
- Niko S Radulović
- Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia.
| | - Milica M Todorovska
- Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia
| | - Dragan B Zlatković
- Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia
| | - Nikola M Stojanović
- Faculty of Medicine, University of Niš, Dr Zoran Ðinđić Boulevard 81, 18000 Niš, Serbia
| | - Pavle J Randjelović
- Department of Physiology, Faculty of Medicine, University of Niš, Dr Zoran Ðinđić Boulevard 81, 18000 Niš, Serbia
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12
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Trotta V, Lee WH, Loo CY, Young PM, Traini D, Scalia S. Co-spray dried resveratrol and budesonide inhalation formulation for reducing inflammation and oxidative stress in rat alveolar macrophages. Eur J Pharm Sci 2016; 86:20-8. [PMID: 26944422 DOI: 10.1016/j.ejps.2016.02.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 02/29/2016] [Accepted: 02/29/2016] [Indexed: 01/08/2023]
Abstract
Oxidative stress is instrumental in the pathogenesis and progression of chronic obstructive pulmonary disease (COPD). Novel therapeutic strategies that target macrophages, based on the use of antioxidant compounds, could be explored to improve corticosteroid responses in COPD patients. In this study, inhalable microparticles containing budesonide (BD) and resveratrol (RES) were prepared and characterized. This approach was undertaken to develop a multi-drug inhalable formulation with anti-oxidant and anti-inflammatory activities for treatment of chronic lung diseases. The inhalable microparticles containing different ratios of BD and RES were prepared by spray drying. The physico-chemical properties of the formulations were characterized in terms of surface morphology, particle size, physical and thermal stability. Additionally, in vitro aerosol performances of these formulations were evaluated with the multi-stage liquid impinger (MSLI) at 60 and 90 l/min, respectively. The cytotoxicity effect of the formulations was evaluated using rat alveolar macrophages. The biological responses of alveolar macrophages in terms of cytokine expressions, nitric oxide (NO) production and free radical scavenging activities were also tested. The co-spray dried (Co-SD) microparticles of all formulations exhibited morphologies appropriate for inhalation administration. Analysis of the deposition profiles showed an increase in aerosol performance proportional to BD concentration. Cell viability assay demonstrated that alveolar macrophages could tolerate a wide range of RES and BD concentrations. In addition, RES and BD were able to decrease the levels of tumour necrosis factor alpha (TNF-α) and interleukin-6 (IL-6) in lipopolysaccharide (LPS) induced alveolar macrophages. This study has successfully established the manufacture of Co-SD formulations of RES and BD with morphology and aerosol properties suitable for inhalation drug delivery, negligible in vitro toxicity and enhanced efficacy to control inflammation and oxidative stress in LPS-induced alveolar macrophages.
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Affiliation(s)
- Valentina Trotta
- Respiratory Technology, Woolcock Institute of Medical Research, Australia; Department of Chemical and Pharmaceutical Sciences, University of Ferrara, 44121 Ferrara, Italy; Discipline of Pharmacology, Sydney Medical School, The University of Sydney, NSW 2006, Australia
| | - Wing-Hin Lee
- Respiratory Technology, Woolcock Institute of Medical Research, Australia; Discipline of Pharmacology, Sydney Medical School, The University of Sydney, NSW 2006, Australia
| | - Ching-Yee Loo
- Respiratory Technology, Woolcock Institute of Medical Research, Australia; Discipline of Pharmacology, Sydney Medical School, The University of Sydney, NSW 2006, Australia
| | - Paul M Young
- Respiratory Technology, Woolcock Institute of Medical Research, Australia; Discipline of Pharmacology, Sydney Medical School, The University of Sydney, NSW 2006, Australia
| | - Daniela Traini
- Respiratory Technology, Woolcock Institute of Medical Research, Australia; Discipline of Pharmacology, Sydney Medical School, The University of Sydney, NSW 2006, Australia.
| | - Santo Scalia
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, 44121 Ferrara, Italy
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13
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Kim YJ. Rhamnazin inhibits LPS-induced inflammation and ROS/RNS in raw macrophages. ACTA ACUST UNITED AC 2016. [DOI: 10.4163/jnh.2016.49.5.288] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- You Jung Kim
- Department of Dental Hygiene, Busan Women's College, Busanjin-Gu, Busan 47228, Korea
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14
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SADEGHI S, SEYED N, RAFATI S, TAHERI T. Optimization of the Timing of Induction for the Assessment of Nitric Oxide Production in Leishmania major Infected Macrophage Cells. IRANIAN JOURNAL OF PARASITOLOGY 2016; 11:325-331. [PMID: 28127337 PMCID: PMC5256048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND The present study was conducted to investigate the optimized timing for macrophages induction and nitric oxide (NO) production against invading Leishmania parasite. METHODS The present study examined the murine macrophage cell line, B10R, in three different states. In the first state, the cells were first infected with L. major and then treated with IFN-γ and LPS as stimulants. In the second state, the cells were infected after stimulation with IFN-γ and LPS. In the third state, the cells were only exposed to stimulants as controls. In all the three states, cell culture supernatants were collected at three points in time (6, 24 and 48 h) and the amount of NO production was measured using Griess assay. RESULTS The treatment of macrophages with inducers prior to infection with stationary phase parasite led to the secretion of significant amounts of NO, particularly at early time points quit contrary to the cells infected with parasites prior to induction. The amount of NO produced by cells induced after infection was detected significantly lower. CONCLUSION The induction of macrophages prior to infection with parasites leads to the production and secretion of greater amounts of NO, resulting in an increased ability to suppress and inhibit parasite proliferation even in the early stages of infection.
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Affiliation(s)
- Somaye SADEGHI
- Dept. of Immunotherapy and Leishmania Vaccine Research, Pasteur Institute of Iran, Tehran, Iran,Immunogenetic Research Center, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Negar SEYED
- Dept. of Immunotherapy and Leishmania Vaccine Research, Pasteur Institute of Iran, Tehran, Iran
| | - Sima RAFATI
- Dept. of Immunotherapy and Leishmania Vaccine Research, Pasteur Institute of Iran, Tehran, Iran
| | - Tahereh TAHERI
- Dept. of Immunotherapy and Leishmania Vaccine Research, Pasteur Institute of Iran, Tehran, Iran,Correspondence
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15
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Zhang L, Huang C, Guo Y, Gou X, Hinsdale M, Lloyd P, Liu L. MicroRNA-26b Modulates the NF-κB Pathway in Alveolar Macrophages by Regulating PTEN. THE JOURNAL OF IMMUNOLOGY 2015; 195:5404-14. [PMID: 26503952 DOI: 10.4049/jimmunol.1402933] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 09/23/2015] [Indexed: 02/06/2023]
Abstract
NF-κB is one of the best-characterized transcription factors, providing the link between early membrane-proximal signaling events and changes in many inflammatory genes. MicroRNAs are small noncoding RNAs that regulate gene expression at the posttranscriptional level. In this study, we evaluated the role of miR-26b in the LPS-induced inflammatory response in bovine alveolar macrophages (bAMs). LPS stimulation of bAMs upregulated miR-26b at 1 h and downregulated it at 6 and 36 h. Overexpression of miR-26b in bAMs enhanced the LPS-induced mRNA expression of proinflammatory cytokines and chemokines, including TNF-α, IL-1β, IL-8, and IL-10, but it directly inhibited that of IL-6. A similar trend was observed for the release of these cytokines and chemokines from bAMs. miR-26b directly bound the 3'-untranslated region of PTEN, leading to the reduction of PTEN protein in bAMs. miR-26b also enhanced the LPS-induced NF-κB signaling pathway, as revealed by increased NF-κB transcriptional activity and phosphorylation of p65, IκBα, IκB kinase, and Akt. Moreover, PTEN silencing increased the LPS-induced mRNA expression of TNF-α, IL-1β, IL-6, IL-8, and IL-10 and upregulated the NF-κB pathway. Taken together, we conclude that miR-26b participates in the inflammatory response of LPS-stimulated bAMs by modulating the NF-κB pathway through targeting PTEN.
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Affiliation(s)
- Li Zhang
- Oklahoma Center for Respiratory and Infectious Diseases, Oklahoma State University, Stillwater, OK 74078; Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Oklahoma State University, Stillwater, OK 74078; Department of Physiological Sciences, Oklahoma State University, Stillwater, OK 74078; and
| | - Chaoqun Huang
- Oklahoma Center for Respiratory and Infectious Diseases, Oklahoma State University, Stillwater, OK 74078; Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Oklahoma State University, Stillwater, OK 74078; Department of Physiological Sciences, Oklahoma State University, Stillwater, OK 74078; and
| | - Yujie Guo
- Oklahoma Center for Respiratory and Infectious Diseases, Oklahoma State University, Stillwater, OK 74078; Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Oklahoma State University, Stillwater, OK 74078; Department of Physiological Sciences, Oklahoma State University, Stillwater, OK 74078; and
| | - Xuxu Gou
- Oklahoma Center for Respiratory and Infectious Diseases, Oklahoma State University, Stillwater, OK 74078; Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Oklahoma State University, Stillwater, OK 74078; Department of Physiological Sciences, Oklahoma State University, Stillwater, OK 74078; and
| | - Myron Hinsdale
- Oklahoma Center for Respiratory and Infectious Diseases, Oklahoma State University, Stillwater, OK 74078; Department of Physiological Sciences, Oklahoma State University, Stillwater, OK 74078; and Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 74126
| | - Pamela Lloyd
- Oklahoma Center for Respiratory and Infectious Diseases, Oklahoma State University, Stillwater, OK 74078; Department of Physiological Sciences, Oklahoma State University, Stillwater, OK 74078; and
| | - Lin Liu
- Oklahoma Center for Respiratory and Infectious Diseases, Oklahoma State University, Stillwater, OK 74078; Lundberg-Kienlen Lung Biology and Toxicology Laboratory, Oklahoma State University, Stillwater, OK 74078; Department of Physiological Sciences, Oklahoma State University, Stillwater, OK 74078; and
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16
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Grunwald MS, Pires AS, Zanotto-Filho A, Gasparotto J, Gelain DP, Demartini DR, Schöler CM, de Bittencourt PIH, Moreira JCF. The oxidation of HSP70 is associated with functional impairment and lack of stimulatory capacity. Cell Stress Chaperones 2014; 19:913-25. [PMID: 24817194 PMCID: PMC4389853 DOI: 10.1007/s12192-014-0516-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 04/25/2014] [Accepted: 04/27/2014] [Indexed: 01/19/2023] Open
Abstract
Expression of intracellular HSP70 is associated with cytoprotective effects against a wide range of stressful stimuli, such as inflammation, oxidative stress, hypoxia, endotoxins, infections, and fever. This cytoprotective effect is mainly attributed to their ability to stabilize protein structures through chaperone-like reversible interactions. HSP70 was recently detected in the extracellular medium, and its presence in serum is commonly associated with pathological situations, where it exerts modulatory effects on cells of the immune system. Previously, we have described the relationship between serum HSP70 levels, oxidant status, and clinical outcome of septic patients; the group of patients with higher prooxidant status and higher serum HSP70 had also higher mortality. To investigate the possible association between oxidized HSP70 and cytoprotection or cell death, we incubated RAW 264.7 macrophages with oxidized HSP70 and evaluated nitrite production, cell proliferation, cell viability, TNF-α release, and phagocytic activity. We also evaluated structural modifications caused by oxidation in purified HSP70. Oxidation of HSP70 altered its protein structure; besides, the modulatory effect of oxidized HSP70 on RAW264.7 cells was different from that of native HSP70. Macrophages treated with oxidized HSP70 presented lower proliferation and viability, lower phagocytic activity, and lower TNF-α release. These results indicate that oxidation of extracellular HSP70 modified its signaling properties, causing alterations on its modulatory effects on macrophage function and viability.
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Affiliation(s)
- Marcelo Sartori Grunwald
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600, Porto Alegre, Rio Grande do Sul, CEP 90035-003, Brazil,
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17
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Ma Y, Xing Y, Mi H, Guo Z, Lu Y, Xi T. Extraction, preliminary characterization and immunostimulatory activity in vitro of a polysaccharide isolated from Strongylocentrotus nudus eggs. Carbohydr Polym 2014; 111:576-83. [DOI: 10.1016/j.carbpol.2014.04.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Revised: 03/31/2014] [Accepted: 04/03/2014] [Indexed: 12/25/2022]
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18
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Edefonti A, Tel F, Testa S, De Palma D. Febrile urinary tract infections: clinical and laboratory diagnosis, imaging, and prognosis. Semin Nucl Med 2014; 44:123-8. [PMID: 24484749 DOI: 10.1053/j.semnuclmed.2013.10.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
According to the literature, febrile urinary tract infections (UTIs) are among the most common severe bacterial infections occurring in childhood, with potential serious long-term consequences. In recent years, there have been significant developments in our understanding of the pathophysiology and clinical and laboratory issues of febrile UTIs. Studies are focusing on the role of predisposing host factors related to genes regulating immune response, inflammation and fibrosis in the development of acute renal damage and subsequent processes leading to renal scars. All the available guidelines underline the importance of a correct diagnosis of febrile UTI to allow a more rational use of antibiotics and imaging. As a consequence, a shift from aggressive imaging studies to a more restrictive and targeted approach has been recently observed. Regarding the prognosis of febrile UTI, the introduction of prenatal ultrasound studies revealed that a great portion of the alterations at imaging (and thus of the clinical complications), previously attributed to postinfection scarring, were because of congenital kidney and urinary tract abnormalities. Although the long-term consequences of febrile UTIs are difficult to ascertain, it seems that children with febrile UTI, normal renal function and normal kidneys at start present a very low risk of developing decreased renal function or hypertension during follow-up. However, high body temperature and high procalcitonin levels during the acute phase of disease, which are indicative of severe inflammation, and the finding of renal scarring on imaging with DMSA scintigraphy 6 months after febrile UTI, together with the detection of congenital kidney and urinary tract abnormalities, indicate "kidney at risk" in UTI.
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Affiliation(s)
- Alberto Edefonti
- Pediatric Nephrology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
| | - Francesca Tel
- Pediatric Nephrology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Sara Testa
- Pediatric Nephrology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Diego De Palma
- Nuclear Medicine Department, Ospedale di Circolo, Varese, Italy
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19
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Sawale SD, Ambhore PD, Pawar PP, Pathak U, Deb U, Satpute RM. Ameliorating effect of S-2(ω-aminoalkylamino) alkylaryl sulfide (DRDE-07) on sulfur mustard analogue, 2-chloroethyl ethyl sulfide-induced oxidative stress and inflammation. Toxicol Mech Methods 2013; 23:702-10. [DOI: 10.3109/15376516.2013.843109] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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20
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Protective effect of mitochondria-targeted antioxidants in an acute bacterial infection. Proc Natl Acad Sci U S A 2013; 110:E3100-8. [PMID: 23898194 DOI: 10.1073/pnas.1307096110] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Acute pyelonephritis is a potentially life-threatening infection of the upper urinary tract. Inflammatory response and the accompanying oxidative stress can contribute to kidney tissue damage, resulting in infection-induced intoxication that can become fatal in the absence of antibiotic therapy. Here, we show that pyelonephritis was associated with oxidative stress and renal cell death. Oxidative stress observed in pyelonephritic kidney was accompanied by a reduced level of mitochondrial B-cell lymphoma 2 (Bcl-2). Importantly, renal cell death and animal mortality were both alleviated by mitochondria-targeted antioxidant 10(6'-plastoquinonyl) decylrhodamine 19 (SkQR1). These findings suggest that pyelonephritis can be treated by reducing mitochondrial reactive oxygen species and thus by protecting mitochondrial integrity and lowering kidney damage.
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21
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Zhai D, Gomez-Mejiba SE, Gimenez MS, Deter ding LJ, Tomer KB, Mason RP, Ashby MT, Ramirez DC. Free radical-operated proteotoxic stress in macrophages primed with lipopolysaccharide. Free Radic Biol Med 2012; 53:172-81. [PMID: 22580125 PMCID: PMC4078023 DOI: 10.1016/j.freeradbiomed.2012.04.023] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 04/17/2012] [Accepted: 04/21/2012] [Indexed: 01/13/2023]
Abstract
The free-radical-operated mechanism of death of activated macrophages at sites of inflammation is unclear, but it is important to define it in order to find targets to prevent further tissue dysfunction. A well-defined model of macrophage activation at sites of inflammation is the treatment of RAW 264.7 cells with lipopolysaccharide (LPS), with the resulting production of reactive oxygen species (ROS). ROS and other free radicals can be trapped with the nitrone spin trap 5,5-dimethyl-1-pyrroline N-oxide (DMPO), a cell-permeable probe with antioxidant properties, which thus interferes with free-radical-operated oxidation processes. Here we have used immuno-spin trapping to investigate the role of free-radical-operated protein oxidation in LPS-induced cytotoxicity in macrophages. Treatment of RAW 264.7 cells with LPS resulted in increased ROS production, oxidation of proteins, cell morphological changes and cytotoxicity. DMPO was found to trap protein radicals to form protein-DMPO nitrone adducts, to reduce protein carbonyls, and to block LPS-induced cell death. N-Acetylcysteine (a source of reduced glutathione), diphenyleneiodonium (an inhibitor of NADPH oxidase), and 2,2'-dipyridyl (a chelator of Fe(2+)) prevented LPS-induced oxidative stress and cell death and reduced DMPO-nitrone adduct formation, suggesting a critical role of ROS, metals, and protein-radical formation in LPS-induced cell cytotoxicity. We also determined the subcellular localization of protein-DMPO nitrone adducts and identified some candidate proteins for DMPO attachment by LC-MS/MS. The LC-MS/MS data are consistent with glyceraldehyde-3-phosphate dehydrogenase, one of the most abundant, sensitive, and ubiquitous proteins in the cell, becoming labeled with DMPO when the cell is primed with LPS. This information will help find strategies to treat inflammation-associated tissue dysfunction by focusing on preventing free radical-operated proteotoxic stress and death of macrophages.
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Affiliation(s)
- Dili Zhai
- Department of Medicine, Gastroenterology Section, University of Chicago, Chicago, IL 60637, USA
| | - Sandra E. Gomez-Mejiba
- Laboratory of Experimental and Therapeutic Medicine, Instituto Multidisciplinario de Investigaciones Biológicas-San Luis (IMIBIO-SL)-Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), San Luis, San Luis 5700, Argentina
| | - Maria S. Gimenez
- Laboratory of Experimental and Therapeutic Medicine, Instituto Multidisciplinario de Investigaciones Biológicas-San Luis (IMIBIO-SL)-Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), San Luis, San Luis 5700, Argentina
| | - Leesa J. Deter ding
- Laboratory of Structural Biology, NIEHS, National Institutes of Health, Research Triangle Park, NC 27709, USA
| | - Kenneth B. Tomer
- Laboratory of Structural Biology, NIEHS, National Institutes of Health, Research Triangle Park, NC 27709, USA
| | - Ronald P. Mason
- Laboratory of Pharmacology and Chemistry, NIEHS, National Institutes of Health, Research Triangle Park, NC 27709, USA
| | - Michael T. Ashby
- Department of Chemistry and Biochemistry, University of Oklahoma, Norman, OK 73019, USA
| | - Dario C. Ramirez
- Laboratory of Experimental and Therapeutic Medicine, Instituto Multidisciplinario de Investigaciones Biológicas-San Luis (IMIBIO-SL)-Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), San Luis, San Luis 5700, Argentina
- Department of Biochemistry and Biological Sciences, School of Chemistry, Biochemistry and Pharmacy, National University of San Luis, San Luis, San Luis 5700, Argentina
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22
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Platonin mitigates lung injury in a two-hit model of hemorrhage/resuscitation and endotoxemia in rats. J Trauma Acute Care Surg 2012; 72:660-70. [PMID: 22491550 DOI: 10.1097/ta.0b013e3182318551] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND Traumatic hemorrhagic shock and subsequent resuscitation may promote bacteria translocation and cause endotoxemia, a two-hit process that will induce severe lung injury. The pathogenesis involves oxidative stress, neutrophil infiltration, and inflammatory response. Platonin, a potent antioxidant, possesses potent anti-inflammation capacity. We sought to elucidate whether platonin could mitigate acute lung injury in a two-hit model of traumatic hemorrhage/resuscitation and subsequent endotoxemia. METHODS Adult male rats were randomized to receive traumatic hemorrhage/resuscitation plus lipopolysaccharide (HS/L) alone or HS/L plus platonin (200 μg/kg; n = 12 in each group). Sham groups were used simultaneously. At 6 hours after resuscitation, rats were killed and the levels of lung injury were assayed. RESULTS Rats treated with HS/L alone had severe lung injury as evidenced by significant alterations in lung function (i.e., arterial blood gas and alveolar-arterial oxygen difference) and histology. Significant increases in polymorphonuclear leukocytes/alveoli ratio (neutrophil infiltration index) and significant increases in the concentrations of inflammatory molecules (including chemokine, cytokine, and prostaglandin E2) and malondialdehyde (lipid peroxidation index) revealed that HS/L caused significant oxidative stress, neutrophil infiltration, and inflammatory response in rat lungs. Moreover, our data revealed that the levels of functional and histologic alteration as well as polymorphonuclear leukocytes/alveoli ratio and the concentrations of inflammatory molecules and malondialdehyde in rats treated with HS/L plus platonin (200 μg/kg) were significantly lower than those treated with HR/L alone. CONCLUSIONS Platonin mitigates lung injury in a two-hit model of traumatic hemorrhage/resuscitation and endotoxemia in rats.
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Affiliation(s)
- Giovanni Montini
- Department of Pediatrics, Azienda Ospedaliero-Universitaria Sant'Orsola-Malpighi, Bologna, Italy.
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Huang Y, Li J, Meng XM, Jiang GL, Li H, Cao Q, Yu SC, Lv XW, Cheng WM. Effect of triterpene acids of Eriobotrya japonica (Thunb.) Lindl. leaf and MAPK signal transduction pathway on inducible nitric oxide synthase expression in alveolar macrophage of chronic bronchitis rats. THE AMERICAN JOURNAL OF CHINESE MEDICINE 2010; 37:1099-111. [PMID: 19938219 DOI: 10.1142/s0192415x09007521] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The goal of this study was to investigate the possible therapy mechanism of triterpene acids of Eriobotrya japonica (Thunb.) Lindl. Leaf (TAL) in alveolar macrophage (AM) of chronic bronchitis (CB) rats. CB model was established by injection of bacillus calmette guein (BCG) plus lipopolisacharide (LPS) in rats. TAL significantly inhibited the increased NO concentration, iNOS expression and phosphorylation of p38 MAPK in alveolar macrophages (AMs) of CB rats. Using in vivo test, we found that SB203580, a p38 MAPK inhibitor, (10 muM) significantly inhibited inducible nitric oxide synthase (iNOS) mRNA expression in AM. This data indicate that TAL highly decreases excessive iNOS expression and NO induction, and p38 MAPK signal transduction participates in iNOS expression and NO induction in AM of CB rats. The effect of TAL on iNOS expression in AM may be related to its inhibition of p38 MAPK signal transduction.
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Affiliation(s)
- Y Huang
- School of Pharmacy, Anhui Medical University, Hefei 230032, Anhui Province, China
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25
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Smyth T, Tötemeyer S, Haugland S, Willers C, Peters S, Maskell D, Bryant C. Dexamethasone modulates Salmonella enterica serovar Typhimurium infection in vivo independently of the glucocorticoid-inducible protein annexin-A1. ACTA ACUST UNITED AC 2009; 54:339-48. [PMID: 19049646 PMCID: PMC2704934 DOI: 10.1111/j.1574-695x.2008.00485.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Salmonella enterica serovar Typhimurium (S. Typhimurium) infection causes an inflammatory response through activation of Toll-like receptor 4 by lipopolysaccharide. Dexamethasone, a glucocorticoid analogue, suppresses inflammatory responses by many mechanisms including inhibition of the lipopolysaccharide-induced production of proinflammatory mediators. There is little information on the effect of glucocorticoids on murine salmonellosis. In this study, we treated susceptible BALB/c mice by subcutaneous implantation of slow-release dexamethasone pellets before infection with S. Typhimurium. Dexamethasone promotes bacterial growth early in infection and induces a dose-dependent increase in bacterial growth within mouse livers and spleens. The bacterial load in organs from infected placebo-treated mice was lower than that in dexamethasone-treated mice. Glucocorticoids inhibit lipopolysaccharide-induced inflammation partially through the steroid-inducible protein annexin-A1 (ANXA1). Infection of wild-type and ANXA1 knock-out mice with S. Typhimurium led to similar organ bacterial loads. ANXA1 also did not affect the bacterial load in organs from infected dexamethasone-treated mice. This suggests that glucocorticoids, independently of ANXA1, accelerate S. Typhimurium growth in vivo in susceptible BALB/c mice.
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Affiliation(s)
- Tomoko Smyth
- Department of Veterinary Medicine, The University of Cambridge, Cambridge, UK
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Targeting the NF-kappaB pathway in asthma and chronic obstructive pulmonary disease. Pharmacol Ther 2008; 121:1-13. [PMID: 18950657 PMCID: PMC7172981 DOI: 10.1016/j.pharmthera.2008.09.003] [Citation(s) in RCA: 286] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2008] [Accepted: 09/09/2008] [Indexed: 11/23/2022]
Abstract
Asthma and chronic obstructive pulmonary disease are inflammatory lung disorders responsible for significant morbidity and mortality worldwide. While the importance of allergic responses in asthma is well known, respiratory viral and bacterial infections and pollutants especially cigarette smoke are important factors in the pathogenesis of both diseases. Corticosteroid treatment remains the first preference of treatment in either disease, however these therapies are not always completely effective, and are associated with side effects and steroid resistance. Due to such limitations, development of new treatments represents a major goal for both the pharmaceutical industry and academic researchers. There are now excellent reasons to promote NF-kappaB signalling intermediates and Rel family proteins as potential therapeutic targets for both asthma and chronic obstructive pulmonary disease. This notion is supported by the fact that much of the underlying inflammation of both diseases independent of stimuli, is mediated at least in part, by NF-kappaB mediated signalling events in several cell types. Also, a range of inhibitors of NF-kappaB signalling intermediates are now available, including DNA oligonucleotides and DNA-peptide molecules that act as NF-kappaB decoy sequences, small molecule inhibitors such as IKK-beta inhibitors, and proteasome inhibitors affecting NF-kappaB signalling, that have either shown promise in animal models or have begun clinical trials in other disorders. This review will focus on the role of NF-kappaB in both diseases, will discuss its suitability as a target, and will highlight recent key studies that support the potential of NF-kappaB as a therapeutic target in these two important inflammatory lung diseases.
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Inhibition of inducible Nitric Oxide Synthase by a mustard gas analog in murine macrophages. BMC Cell Biol 2006; 7:39. [PMID: 17137498 PMCID: PMC1698482 DOI: 10.1186/1471-2121-7-39] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2006] [Accepted: 11/30/2006] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND 2-Chloroethyl ethyl sulphide (CEES) is a sulphur vesicating agent and an analogue of the chemical warfare agent 2,2'-dichlorodiethyl sulphide, or sulphur mustard gas (HD). Both CEES and HD are alkylating agents that influence cellular thiols and are highly toxic. In a previous publication, we reported that lipopolysaccharide (LPS) enhances the cytotoxicity of CEES in murine RAW264.7 macrophages. In the present investigation, we studied the influence of CEES on nitric oxide (NO) production in LPS stimulated RAW264.7 cells since NO signalling affects inflammation, cell death, and wound healing. Murine macrophages stimulated with LPS produce NO almost exclusively via inducible nitric oxide synthase (iNOS) activity. We suggest that the influence of CEES or HD on the cellular production of NO could play an important role in the pathophysiological responses of tissues to these toxicants. In particular, it is known that macrophage generated NO synthesised by iNOS plays a critical role in wound healing. RESULTS We initially confirmed that in LPS stimulated RAW264.7 macrophages NO is exclusively generated by the iNOS form of nitric oxide synthase. CEES treatment inhibited the synthesis of NO (after 24 hours) in viable LPS-stimulated RAW264.7 macrophages as measured by either nitrite secretion into the culture medium or the intracellular conversion of 4,5-diaminofluorescein diacetate (DAF-2DA) or dichlorofluorescin diacetate (DCFH-DA). Western blots showed that CEES transiently decreased the expression of iNOS protein; however, treatment of active iNOS with CEES in vitro did not inhibit its enzymatic activity CONCLUSION CEES inhibits NO production in LPS stimulated macrophages by decreasing iNOS protein expression. Decreased iNOS expression is likely the result of CEES induced alteration in the nuclear factor kappa B (NF-kappaB) signalling pathway. Since NO can act as an antioxidant, the CEES induced down-regulation of iNOS in LPS-stimulated macrophages could elevate oxidative stress. Since macrophage generated NO is known to play a key role in cutaneous wound healing, it is possible that this work has physiological relevance with respect to the healing of HD induced skin blisters.
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Agorreta J, Garayoa M, Montuenga LM, Zulueta JJ. Effects of acute hypoxia and lipopolysaccharide on nitric oxide synthase-2 expression in acute lung injury. Am J Respir Crit Care Med 2003; 168:287-96. [PMID: 12773330 DOI: 10.1164/rccm.200209-1027oc] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The potential role of nitric oxide synthase-2 (NOS2) in acute lung injury (ALI) has gained increasing attention. This study evaluates the effects of hypoxia, an important feature of ALI, on NOS2 expression in a rat model of ALI caused by exposure to hypoxia and LPS. Exposure to hypoxia alone had no effect on the expression of NOS2 in rat lungs. LPS treatment resulted in a significant increase in NOS2 in the lungs, which was further enhanced by concomitant exposure to hypoxia. Immunohistochemical analysis and in situ hybridization showed no changes in the expression of NOS2 in lung resident cells under any conditions. The increase in NOS2 levels is mainly due to the influx of NOS2-expressing inflammatory cells. By morphologic analysis, these inflammatory cells were identified as neutrophils, lymphocytes, and monocytes. In vitro experiments of lung epithelial and endothelial cell lines showed no detectable expression of NOS2 with any of the treatments. In a macrophage cell line, LPS-induced NOS2 expression was not affected by the concomitant exposure to hypoxia. In conclusion, LPS increases NOS2 expression in rat lungs through the recruitment of NOS2-producing leukocytes. Simultaneous exposure to LPS and hypoxia results in a greater influx of inflammatory cells that further enhances NOS2 expression.
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Affiliation(s)
- Jackeline Agorreta
- Department of Histology and Pathology, University of Navarra, Pamplona, Spain.
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