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Silva AR, de Souza e Souza KFC, Souza TBD, Younes-Ibrahim M, Burth P, de Castro Faria Neto HC, Gonçalves-de-Albuquerque CF. The Na/K-ATPase role as a signal transducer in lung inflammation. Front Immunol 2024; 14:1287512. [PMID: 38299144 PMCID: PMC10827986 DOI: 10.3389/fimmu.2023.1287512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 12/26/2023] [Indexed: 02/02/2024] Open
Abstract
Acute respiratory distress syndrome (ARDS) is marked by damage to the capillary endothelium and alveolar epithelium following edema formation and cell infiltration. Currently, there are no effective treatments for severe ARDS. Pathologies such as sepsis, pneumonia, fat embolism, and severe trauma may cause ARDS with respiratory failure. The primary mechanism of edema clearance is the epithelial cells' Na/K-ATPase (NKA) activity. NKA is an enzyme that maintains the electrochemical gradient and cell homeostasis by transporting Na+ and K+ ions across the cell membrane. Direct injury on alveolar cells or changes in ion transport caused by infections decreases the NKA activity, loosening tight junctions in epithelial cells and causing edema formation. In addition, NKA acts as a receptor triggering signal transduction in response to the binding of cardiac glycosides. The ouabain (a cardiac glycoside) and oleic acid induce lung injury by targeting NKA. Besides enzymatic inhibition, the NKA triggers intracellular signal transduction, fostering proinflammatory cytokines production and contributing to lung injury. Herein, we reviewed and discussed the crucial role of NKA in edema clearance, lung injury, and intracellular signaling pathway activation leading to lung inflammation, thus putting the NKA as a protagonist in lung injury pathology.
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Affiliation(s)
- Adriana Ribeiro Silva
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
| | | | - Thamires Bandeira De Souza
- Laboratório de Imunofarmacologia, Departamento de Ciências Fisiológicas, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
- Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niterói, Brazil
| | - Mauricio Younes-Ibrahim
- Departamento de Medicina Interna, Faculdade de Ciências Médicas, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Patrícia Burth
- Departamento de Biologia Celular e Molecular, Instituto de Biologia, Universidade Federal Fluminense, Niterói, Brazil
| | | | - Cassiano Felippe Gonçalves-de-Albuquerque
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz (FIOCRUZ), Rio de Janeiro, Brazil
- Laboratório de Imunofarmacologia, Departamento de Ciências Fisiológicas, Universidade Federal do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
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d'Avila JC, Carlos AS, Vieira RL, Vergueiro C, Lima AT, Silva IDS, de Figueiredo VC, Chateaubriand PHP, Moreno AM, de Castro Faria Neto HC, Estato V, Siqueira RA. Beneficial effects of empagliflozin and liraglutide on the cerebral microcirculation of diabetic rats. Microcirculation 2023; 30:e12825. [PMID: 37549191 DOI: 10.1111/micc.12825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 07/05/2023] [Accepted: 07/24/2023] [Indexed: 08/09/2023]
Abstract
OBJECTIVES This study aimed to evaluate the effects of the antidiabetics liraglutide, a GLP-1 analog, and empagliflozin, an SGLT-2 inhibitor, on the brain microcirculation of diabetic rats. METHODS Type 2 diabetes mellitus (DM) was experimentally induced in male Wistar rats by combining a high-fat diet and a low dose of streptozotocin (35 mg/kg). Liraglutide (100 μg/kg s.c.) and empagliflozin (10 mg/kg, oral) were administered for 5 weeks. Body weight was monitored periodically. Oral glucose tolerance, fasting glycemia, and blood triglycerides were evaluated after the treatments. Endothelial-leukocyte interactions in the brain microcirculation and structural capillary density were assessed. RESULTS DM rats presented metabolic and cerebrovascular alterations. Liraglutide treatment decreased body weight and blood triglycerides of DM rats. Empagliflozin treatment improved glucose tolerance but only the combination therapy significantly reduced fasting blood glucose. Both treatments and their combination reduced leukocyte adhesion into the endothelium of brain venules. However, empagliflozin was more effective in preventing DM-induced microvascular rarefaction. CONCLUSION These findings suggest that chronic treatment with SGLT2 inhibitors and GLP-1 receptor agonists may serve as potential therapeutic approaches to prevent microvascular complications associated with diabetes.
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Affiliation(s)
- Joana Costa d'Avila
- Pre-clinical Research Laboratory, Iguaçu University, Nova Iguaçu, Brazil
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro, Brazil
| | | | | | - Carla Vergueiro
- Pre-clinical Research Laboratory, Iguaçu University, Nova Iguaçu, Brazil
| | | | | | | | | | | | | | - Vanessa Estato
- Laboratory of Immunopharmacology, Oswaldo Cruz Institute, FIOCRUZ, Rio de Janeiro, Brazil
- School of Medicine, Estácio de Sá University, Rio de Janeiro, Brazil
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da Rosa N, de Medeiros FD, de Oliveira J, Laurentino AOM, Peretti EDM, Machado RS, Lourenço MP, da Silva TI, Fernandes TDC, Reis PA, de Castro Faria Neto HC, Prophiro JS, Fortunato JJ, Petronilho F. 6-shogaol exerts a neuroprotective factor in offspring after maternal immune activation in rats. Dev Neurosci 2021; 44:13-22. [PMID: 34695825 DOI: 10.1159/000519992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Accepted: 09/28/2021] [Indexed: 11/19/2022] Open
Affiliation(s)
- Naiana da Rosa
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, Brazil
| | - Fabiana Durante de Medeiros
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, Brazil
| | - Juliana de Oliveira
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, Brazil
| | - Ana Olívia Martins Laurentino
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, Brazil
| | - Eduardo de Medeiros Peretti
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, Brazil
| | - Richard Simon Machado
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, Brazil
| | - Millena Pais Lourenço
- Immunopharmacology Laboratory, Oswaldo Cruz Institute/IOC/FIOCRUZ, Rio de Janeiro, Brazil
| | | | | | - Patrícia Alves Reis
- Immunopharmacology Laboratory, Oswaldo Cruz Institute/IOC/FIOCRUZ, Rio de Janeiro, Brazil
| | | | - Josiane Somariva Prophiro
- Research Group in Immunoparasitology, Graduate Program in Health Sciences, Health Sciences Unit, University of Southern Santa Catarina, (UNISUL), Tubarão, Brazil
| | - Jucélia Jeremias Fortunato
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, Brazil
| | - Fabrícia Petronilho
- Laboratory of Neurobiology of Inflammatory and Metabolic Processes, Graduate Program in Health Sciences, Health Sciences Unit, University of South Santa Catarina, Tubarão, Brazil
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Righy C, Turon R, Freitas GD, Japiassú AM, Faria Neto HCDC, Bozza M, Oliveira MF, Bozza FA. Hemoglobin metabolism by-products are associated with an inflammatory response in patients with hemorrhagic stroke. Rev Bras Ter Intensiva 2018; 30:21-27. [PMID: 29742229 PMCID: PMC5885227 DOI: 10.5935/0103-507x.20180003] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 11/13/2017] [Indexed: 11/20/2022] Open
Abstract
Objective To evaluate the relationships of brain iron and heme with the inflammatory
response of the systemic and central nervous systems and to investigate the
role of defensive systems against the toxicity of iron and heme in the
central nervous system. Methods We assessed a prospective cohort of patients presenting with intracerebral
and subarachnoid hemorrhage. We assayed plasma and cerebrospinal fluid
samples for the presence of iron, heme, hemopexin, haptoglobin, enolase,
S100-β and cytokines for the first three days following hemorrhagic
stroke. We also analyzed the dynamic changes in these components within both
fluids and their relationship with early mortality rates. Results Hemopexin and haptoglobin concentrations were nearly negligible in the brain
after intracerebral and subarachnoid hemorrhage. Cerebrospinal fluid iron
and heme concentrations correlated with a pro-inflammatory response in the
central nervous system, and plasmatic and cerebrospinal fluid inflammatory
profiles on the third day after hemorrhagic stroke were related to early
mortality rates. Interleukin 4 levels within the cerebrospinal fluid during
the first 24 hours after hemorrhagic stroke were found to be higher in
survivors than in non-survivors. Conclusion Iron and heme are associated with a pro-inflammatory response in the central
nervous system following hemorrhagic stroke, and protections against
hemoglobin and heme are lacking within the human brain. Patient inflammatory
profiles were associated with a poorer prognosis, and local
anti-inflammatory responses appeared to have a protective role.
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Affiliation(s)
- Cássia Righy
- Laboratório de Pesquisa Clínica em Medicina Intensiva, Instituto Nacional de Infectologia Evandro Chagas, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Ricardo Turon
- Instituto Estadual do Cérebro Paulo Niemeyer, Rio de Janeiro, RJ, Brasil
| | - Gabriel de Freitas
- Hospital Universitário Antônio Pedro, Universidade Federal Fluminense, Nieterói, RJ, Brazil
| | - André Miguel Japiassú
- Laboratório de Pesquisa Clínica em Medicina Intensiva, Instituto Nacional de Infectologia Evandro Chagas, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | | | - Marcelo Bozza
- Laboratório de Inflamação e Imunidade, Departamento de Imunologia, Instituto de Microbiologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Marcus F Oliveira
- Laboratório de Bioquímica de Resposta ao Estresse, Instituto de Bioquímica Médica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Fernando A Bozza
- Laboratório de Pesquisa Clínica em Medicina Intensiva, Instituto Nacional de Infectologia Evandro Chagas, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
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Fortunato JJ, da Rosa N, Martins Laurentino AO, Goulart M, Michalak C, Borges LP, da Cruz Cittadin Soares E, Reis PA, de Castro Faria Neto HC, Petronilho F. Effects of ω-3 fatty acids on stereotypical behavior and social interactions in Wistar rats prenatally exposed to lipopolysaccarides. Nutrition 2017; 35:119-127. [DOI: 10.1016/j.nut.2016.10.019] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 10/21/2016] [Accepted: 10/29/2016] [Indexed: 02/07/2023]
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Costa Carvalho JL, de Brito AA, de Oliveira APL, de Castro Faria Neto HC, Pereira TM, de Carvalho RA, Anatriello E, Aimbire F. The chemokines secretion and the oxidative stress are targets of low-level laser therapy in allergic lung inflammation. J Biophotonics 2016; 9:1208-1221. [PMID: 27649282 DOI: 10.1002/jbio.201600061] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 07/23/2016] [Accepted: 07/24/2016] [Indexed: 06/06/2023]
Abstract
Recent studies show that low-level laser therapy (LLLT) has an important anti-inflammatory action in acute lung inflammation. The present work explored if laser therapy is able to antagonize eosinophils and allergic inflammation induced by oxidative stress in Balb/c mice. Forty-eight hours after challenge, the leukocyte counting, ROS and nitrite/nitrate level, RANTES, CCL3, CCL8 as well as eotaxins were measured in the bronchoalveolar lavage fluid (BALF) of laser-treated mice or not. Into the lung, some chemokines receptors, the iNOS activity and mRNA expression, and the activities of superoxide dismutase (SOD), catalase, gluthatione, NADPH oxidase activities and thiobarbituric acid reactive species (T-Bars) were measured. Laser-treated allergic mice presented reduction of both the ICAM-1 and eosinophil in the lungs. RANTES, CCL8, CCL3 and eotaxins were reduced in BALF of laser-treated allergic mice. In allergic mice lung LLLT decreased the CCR1 and CCR3 and restored the oxidative stress balance as well. Laser decreased the lipidic peroxidation in allergic mice lung as much as increased SOD, GPx and GR. It shows that LLLT on allergic lung inflammation involves leukocyte-attractant chemokines and endogenous antioxidant. Based on results, LLLT may ultimately become a non- invasive option in allergic lung disease treatment. The top figure illustrates the laser decreasing the eosinophils migration into BALF and the bottom figure shows the laser upregulating the expression of heme-oxygenase (anti-oxidant enzyme) in lung tissue anti-oxidant.
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Affiliation(s)
- Jorge Luis Costa Carvalho
- Department of Science and Technology, Federal University of São Paulo - UNIFESP, Rua Talim, 330 - Vila Nair, PO Box 12231-280, São José dos Campos, São Paulo, SP, Brazil
| | - Auriléia Aparecida de Brito
- Laboratory of Pulmonary and Exercise Immunology-LABPEI, Nove de Julho University (UNINOVE), São Paulo, SP, Brazil
| | | | | | - Thiago Martini Pereira
- Laboratory of Pulmonary and Exercise Immunology-LABPEI, Nove de Julho University (UNINOVE), São Paulo, SP, Brazil
| | - Regiane Albertini de Carvalho
- Department of Science and Technology, Federal University of São Paulo - UNIFESP, Rua Talim, 330 - Vila Nair, PO Box 12231-280, São José dos Campos, São Paulo, SP, Brazil
| | - Elen Anatriello
- Department of Science and Technology, Federal University of São Paulo - UNIFESP, Rua Talim, 330 - Vila Nair, PO Box 12231-280, São José dos Campos, São Paulo, SP, Brazil
| | - Flávio Aimbire
- Department of Science and Technology, Federal University of São Paulo - UNIFESP, Rua Talim, 330 - Vila Nair, PO Box 12231-280, São José dos Campos, São Paulo, SP, Brazil
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Silvares RR, Pereira ENGDS, Flores EEI, Estato V, Reis PA, Silva IJD, Machado MP, Neto HCDCF, Tibiriça E, Daliry A. Combined therapy with metformin and insulin attenuates systemic and hepatic alterations in a model of high-fat diet-/streptozotocin-induced diabetes. Int J Exp Pathol 2016; 97:266-77. [PMID: 27381700 DOI: 10.1111/iep.12184] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 03/16/2016] [Indexed: 12/22/2022] Open
Abstract
In this study we have explored the pathogenesis of the hepatic alterations which occur in diabetes and the modulation of these complications by the combination of metformin adjunct treatment and insulin monotherapy. For this purpose, diabetic rats were treated with insulin (DM + Ins) or metformin plus insulin (DM + Met + Ins). Biochemical and cardiometabolic parameters were analysed by spectrophotometry. Intravital microscopy was used to study the hepatic microcirculation. In the liver tissue, real-time PCR was used to analyse oxidative stress enzymes, inflammatory markers and receptors for advanced glycation end products (AGE) (RAGE) gene expression. Lipid peroxidation was assessed by thiobarbituric acid reactive species (TBARs) analyses. AGE deposition and RAGE protein expression were studied by fluorescence spectrophotometry and Western blot respectively. Body weight, %HbA1c , urea, total proteins and oxidative stress parameters were found to be similarly improved by insulin or Met + Ins treatments. On the other hand, Met + Ins treatment showed a more pronounced effect on fasting blood glucose level than insulin monotherapy. Fructosamine, uric acid, creatinine, albumin and amylase levels and daily insulin dose requirements were found to be only improved by the combined Met + Ins treatment. Liver, renal and pancreatic dysfunction markers were found to be more positively affected by metformin adjunct therapy when compared to insulin treatment. Liver microcirculation damage was found to be completely protected by Met + Ins treatment, while insulin monotherapy showed no effect. Our results suggest that oxidative stress, microcirculatory damage and glycated proteins could be involved in the aetiology of liver disease due to diabetes. Additionally, metformin adjunct treatment improved systemic and liver injury in induced diabetes and showed a more pronounced effect than insulin monotherapy.
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Affiliation(s)
- Raquel Rangel Silvares
- Laboratório de Investigação Cardiovascular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | | | - Edgar Eduardo Ilaquita Flores
- Laboratório de Investigação Cardiovascular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Vanessa Estato
- Laboratório de Investigação Cardiovascular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Patrícia Alves Reis
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Igor José da Silva
- Laboratório de Patologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Marcelo Pelajo Machado
- Laboratório de Patologia, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | | | - Eduardo Tibiriça
- Laboratório de Investigação Cardiovascular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
| | - Anissa Daliry
- Laboratório de Investigação Cardiovascular, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, RJ, Brazil
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Gonçalves-de-Albuquerque CF, Burth P, Silva AR, de Moraes IMM, Oliveira FMDJ, Santelli RE, Freire AS, de Lima GS, da Silva ED, da Silva CI, Morandi V, Bozza PT, Younes-Ibrahim M, de Castro Faria Neto HC, de Castro Faria MV. Murine lung injury caused by Leptospira interrogans glycolipoprotein, a specific Na/K-ATPase inhibitor. Respir Res 2014; 15:93. [PMID: 25265888 PMCID: PMC4151191 DOI: 10.1186/s12931-014-0093-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 07/31/2014] [Indexed: 12/15/2022] Open
Abstract
Background Leptospiral glycolipoprotein (GLP) is a potent and specific Na/K-ATPase inhibitor. Severe pulmonary form of leptospirosis is characterized by edema, inflammation and intra-alveolar hemorrhage having a dismal prognosis. Resolution of edema and inflammation determines the outcome of lung injury. Na/K-ATPase activity is responsible for edema clearance. This enzyme works as a cell receptor that triggers activation of mitogen-activated protein kinase (MAPK) intracellular signaling pathway. Therefore, injection of GLP into lungs induces injury by triggering inflammation. Methods We injected GLP and ouabain, into mice lungs and compared their effects. Bronchoalveolar lavage fluid (BALF) was collected for cell and lipid body counting and measurement of protein and lipid mediators (PGE2 and LTB4). The levels of the IL-6, TNFα, IL-1B and MIP-1α were also quantified. Lung images illustrate the injury and whole-body plethysmography was performed to assay lung function. We used Toll-like receptor 4 (TLR4) knockout mice to evaluate leptospiral GLP-induced lung injury. Na/K-ATPase activity was determined in lung cells by nonradioactive rubidium incorporation. We analyzed MAPK p38 activation in lung and in epithelial and endothelial cells. Results Leptospiral GLP and ouabain induced lung edema, cell migration and activation, production of lipid mediators and cytokines and hemorrhage. They induced lung function alterations and inhibited rubidium incorporation. Using TLR4 knockout mice, we showed that the GLP action was not dependent on TLR4 activation. GLP activated of p38 and enhanced cytokine production in cell cultures which was reversed by a selective p38 inhibitor. Conclusions GLP and ouabain induced lung injury, as evidenced by increased lung inflammation and hemorrhage. To our knowledge, this is the first report showing GLP induces lung injury. GLP and ouabain are Na/K-ATPase targets, triggering intracellular signaling pathways. We showed p38 activation by GLP-induced lung injury, which was may be linked to Na/K-ATPase inhibition. Lung inflammation induced by GLP was not dependent on TLR4 activation.
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Gonçalves-de-Albuquerque CF, Silva AR, Burth P, de Moraes IMM, Oliveira FMDJ, Younes-Ibrahim M, dos Santos MDCB, D'Ávila H, Bozza PT, Faria Neto HCDC, Faria MVDC. Oleic acid induces lung injury in mice through activation of the ERK pathway. Mediators Inflamm 2012; 2012:956509. [PMID: 23209347 PMCID: PMC3504460 DOI: 10.1155/2012/956509] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 10/18/2012] [Indexed: 01/06/2023] Open
Abstract
Oleic acid (OA) can induce acute lung injury in experimental models. In the present work, we used intratracheal OA injection to show augmented oedema formation, cell migration and activation, lipid mediator, and cytokine productions in the bronchoalveolar fluids of Swiss Webster mice. We also demonstrated that OA-induced pulmonary injury is dependent on ERK1/2 activation, since U0126, an inhibitor of ERK1/2 phosphorylation, blocked neutrophil migration, oedema, and lipid body formation as well as IL-6, but not IL-1β production. Using a mice strain carrying a null mutation for the TLR4 receptor, we proved that increased inflammatory parameters after OA challenges were not due to the activation of the TLR4 receptor. With OA being a Na/K-ATPase inhibitor, we suggest the possible involvement of this enzyme as an OA target triggering lung inflammation.
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Quevedo J, Reis PA, Comim CM, Frutuoso VDS, Barichello T, Dal-Pizzol F, Neto HCDCF. Persistent cognitive damage in cloroquine-treated mice with cerebral malaria. BMC Proc 2008. [DOI: 10.1186/1753-6561-2-s1-p58] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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de Castro SH, Faria Neto HCDC, Gomes MDB. Platelet-activating factor acetylhydrolase (PAF-AH) activity in patients with type 1 diabetes mellitus. Arq Bras Cardiol 2007; 88:179-84. [PMID: 17384835 DOI: 10.1590/s0066-782x2007000200008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2005] [Accepted: 04/11/2006] [Indexed: 11/22/2022] Open
Abstract
OBJECTIVE To evaluate platelet-activating factor acetylhydrolase (PAF-AH) activity and its relationship with clinical and demographic variables, metabolic control, apolipoprotein A and B levels and the susceptibility of low-density lipoprotein (LDL) to in vitro oxidation in patients with type 1 diabetes mellitus (DM 1). METHODS Forty two patients with DM 1 (27 females) and 48 control subjects (16 females) matched for gender, age and body mass index (BMI) were evaluated. The following tests were performed: fast plasma glucose (FG) and postprandial plasma glucose (PPG), lipid profile, uric acid (UA), glycosylated hemoglobin (HbA1c), and low-density lipoprotein (LDL) oxidation rate using colorimetric assay. The PAF-AH activity was analyzed using colorimetric assay (Cayman Chemical). RESULTS The analysis of PAF-AH activity showed a higher enzyme activity in patients with DM 1 than in control subjects (0.0150 +/- 0.0051 vs. 0.0116 +/- 0.0041; p < 0.001). In patients with DM 1, a direct correlation between PAF-AH activity and age and LDL, and an inverse correlation between PAF-AH and HbA1c and high-density lipoprotein (HDL) were found. CONCLUSION In the sample studied, PAF-AH showed a higher activity in patients with DM 1, a factor that may be related to the higher risk of developing cardiovascular diseases observed in these patients. Further studies are necessary to evaluate the real participation of this enzyme in the risk of development of atherosclerotic diseases in patients with DM 1.
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Marathe GK, Silva AR, de Castro Faria Neto HC, Tjoelker LW, Prescott SM, Zimmerman GA, McIntyre TM. Lysophosphatidylcholine and lyso-PAF display PAF-like activity derived from contaminating phospholipids. J Lipid Res 2001. [DOI: 10.1016/s0022-2275(20)30275-3] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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