Leptin Downregulates LPS-Induced Lung Injury: Role of Corticosterone and Insulin

Background/Aims: We investigated the effects of leptin in the development of lipopolysaccharide (LPS)-induced acute lung inflammation (ALI) in lean mice. Methods: Mice were administered leptin (1.0 mu g/g) or leptin (1.0 mu g/g) followed by LPS (1.5 mu g/g) intranasally. Additionally, some animals were given LPS (1.5 mu g/g) or saline intranasally alone, as a control. Tissue samples and fluids were collected six hours after instillation. Results: We demonstrated that leptin alone did not induce any injury. Local LPS exposure resulted in significant acute lung inflammation, characterized by a substantial increase in total cells, mainly neutrophils, in bronchoalveolar lavages (BAL). We also observed a significant lymphocyte influx into the lungs associated with enhanced lung expression of chemokines and cytokines (KC, RANTES, TNF-alpha, IFN-beta, GM-CSF and VEGF). LPS-induced ALI was characterized by the enhanced expression of ICAM-1 and iNOS in the lungs. Mice that received LPS showed an increase in insulin levels. Leptin, when administered prior to LPS instillation, abolished all of these effects. LPS induced an increase in corticosterone levels, and leptin potentiated this event. Conclusion: These data suggest that exogenous leptin may promote protection during sepsis, and downregulation of the insulin levels and upregulation of corticosterone may be important mechanisms in the amelioration of LPS-induced ALI.Copyright (c) 2014 S. Karger AG, BaselConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Complex Fluids INCTFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Univ São Paulo, Inst Biomed Sci 1, Dept Pharmacol, Lab Hypertens, BR-1524 São Paulo, BrazilUniv São Paulo, Inst Biomed Sci, Dept Immunol, Lab Transplantat Immunobiol, BR-1524 São Paulo, BrazilUniv São Paulo, Lab Inflammat & Vasc Pharmacol, BR-05508 São Paulo, BrazilUniversidade Federal de São Paulo, Div Nephrol, Lab Clin & Expt Immunobiol, São Paulo, BrazilUniversidade Federal de São Paulo, Div Nephrol, Lab Clin & Expt Immunobiol, São Paulo, BrazilFAPESP: 12/51104-8FAPESP: 10/01404-0FAPESP: 12/02270-2FAPESP: 12/10512-6Web of Scienc

Acute Kidney Injury Reduces Phagocytic and Microbicidal Capacities of Alveolar Macrophages

Background/Aims: Renal ischaemia-reperfusion injury (IRI) is a systemic inflammatory process in which Th1 responses predominate affecting other organs including the lungs. the present study explored the phagocytic and microbicidal capacity of macrophages in rats with lung inflammation that underwent IRI. Methods: the alveolar macrophages of rats sensitised to OVA were evaluated for phagocytosis and bacterial killing 24h after antigen challenge in animals with or without prior submission to 60 min of renal ischaemia. Results: Bronchoalveolar lavage had a high level of cellular infiltrate in immunised animals (420%) compared with control animals; IRI significantly reduced this infiltration (52%). Macrophages from animals immunised and challenged with OVA presented a 10x increase in phagocytic capacity compared to the control group, whereas immunised animals subjected to IRI showed a reduction in the phagocytic index of 68%. the killing of Klebsiella pneumoniae by macrophages from immunised animals was higher (56%) compared with the control group but reduced in animals submitted to IRI (45%). Immunised and challenged group showed an increase in gene expression levels of IL-10(450%), HO-1 (259%), INF-gamma (460%) and MCP-1 (370%) compared to the immunised group subjected to IRI. Conclusions: Renal ischaemia and reperfusion injury apparently alters the phagocytic and microbicidal capacity of macrophages, reducing lung inflammation to OVA. Copyright (C) 2013 S. Karger AG, BaselFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)INCT Complex FluidsFADA-UNIFESPUniversidade Federal de São Paulo, Disciplina Nefrol, Lab Imunol Clin & Expt, BR-04023900 São Paulo, BrazilUniversidade Federal de São Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Lab Inflamacao & Farmacol Vasc, BR-04023900 São Paulo, BrazilUniv São Paulo, Inst Ciencias Biomed, Dept Imunol, Lab Imunobiol Transplante, BR-05508 São Paulo, BrazilUniversidade Federal de São Paulo, Disciplina Nefrol, Lab Imunol Clin & Expt, BR-04023900 São Paulo, BrazilUniversidade Federal de São Paulo, Inst Ciencias Ambientais Quim & Farmaceut, Lab Inflamacao & Farmacol Vasc, BR-04023900 São Paulo, BrazilFAPESP: 07/07139-3FAPESP: 10/52180-4FAPESP: 10/01404-0FAPESP: 12/02270-0FAPESP: 12/51104-8Web of Scienc

SELETIVIDADE DE SULFENTRAZONE NA CULTURA DO GIRASSOL

The objective of this study was to evaluate the selectivity of the sulfentrazone molecule in post emergence in the sunflower crop. The experiment was conducted in 2014 at Campo Novo do Parecis. The experimental design was a randomized complete block design with nine treatments and four replications. The treatments consisted of seven rates of sulfentrazone (100, 125, 150, 175, 200, 225 and 250 mL ha-1) and two controls, one with manual weeding and one without weeding. The application of the herbicide was done with CO2 pressurized costal sprayer and equipped with an application bar containing five tips of the Teejet XR 110 02vs model, with application volume of 200 L ha-1. It was evaluated the phytotoxicity (%), chapter height, stem diameter, mass of the chapter, mass of achenes per chapter, mass of the plot and mass of thousand achenes. There was a reduction in the chapter height at rates of 225 and 250 ml p.c ha-1, while in the other variables no significant differences were observed. Up to 14 days after application (DAS), injuries were observed, which disappeared in the assessment performed at 21 DAS. The yield of sunflower crop was not affected by the doses of sulfentrazone. Sulfentrazone doses were selective for sunflower cultivation.Objetivou-se avaliar a seletividade da molécula sulfentrazona em pós emergência na cultura do girassol. O experimento foi conduzido em 2014 em Campo Novo do Parecis. O delineamento foi em blocos casualizados com nove tratamentos e quatro repetições. Os tratamentos foram constituídos de sete doses de sulfentrazona (100, 125, 150, 175, 200, 225 e 250 mL ha-1) e duas testemunhas, sendo uma com capina manual e outra sem capina. A aplicação do herbicida foi realizada com pulverizador costal pressurizado a CO2 e equipado com barra de aplicação contendo cinco pontas do modelo Teejet XR 110 02vs, com volume de aplicação de 200 L ha-1. Foi avaliada a fitotoxicidade (%), altura do capítulo, diâmetro da haste, massa do capítulo, massa de aquênios por capítulo, massa da parcela e massa de mil aquênios. Houve redução na altura do capítulo nas doses de 225 e 250 ml p.c ha-1, enquanto que nas demais variáveis não foram observadas diferenças significativas. Até os 14 dias após a aplicação (DAS) foram observadas injúrias, que desapareceram na avaliação realizada aos 21 DAS. A produtividade da cultura do girassol não foi afetada pelas doses de sulfentrazone. As doses de sulfentrazona mostraram-se seletivas para a cultura do girassol

Macrophage Trafficking as Key Mediator of Adenine-Induced Kidney Injury

Macrophages play a special role in the onset of several diseases, including acute and chronic kidney injuries. in this sense, tubule interstitial nephritis (TIN) represents an underestimated insult, which can be triggered by different stimuli and, in the absence of a proper regulation, can lead to fibrosis deposition. Based on this perception, we evaluated the participation of macrophage recruitment in the development of TIN. Initially, we provided adenine-enriched food to WT and searched for macrophage presence and action in the kidney. Also, a group of animals were depleted of macrophages with the clodronate liposome while receiving adenine-enriched diet. We collected blood and renal tissue from these animals and renal function, inflammation, and fibrosis were evaluated. We observed higher expression of chemokines in the kidneys of adenine-fed mice and a substantial protection when macrophages were depleted. Then, we specifically investigated the role of some key chemokines, CCR5 and CCL3, in this TIN experimental model. Interestingly, CCR5 KO and CCL3 KO animals showed less renal dysfunction and a decreased proinflammatory profile. Furthermore, in those animals, there was less profibrotic signaling. in conclusion, we can suggest that macrophage infiltration is important for the onset of renal injury in the adenine-induced TIN.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Instituto Nacional de Ciencia e Tecnologia de Fluidos Complexos (INCT Complex Fluids)Univ São Paulo, Inst Biomed Sci, Dept Immunol, Lab Transplantat Immunobiol, BR-05508900 São Paulo, BrazilUniversidade Federal de São Paulo, Div Nephrol, Lab Clin & Expt Immunol, BR-04023900 São Paulo, BrazilUniversidade Federal de São Paulo, Dept Biophys, BR-04023062 São Paulo, BrazilUniv São Paulo, Inst Chem, Dept Biochem, BR-05508000 São Paulo, BrazilUniv São Paulo, Sch Med Ribeirao Preto, Dept Biochem & Immunol, BR-14049900 Ribeirao Preto, SP, BrazilUniversidade Federal de São Paulo, Div Nephrol, Lab Clin & Expt Immunol, BR-04023900 São Paulo, BrazilUniversidade Federal de São Paulo, Dept Biophys, BR-04023062 São Paulo, BrazilFAPESP: 2009/54474-8FAPESP: 2012/02270-2FAPESP: 2013/25010-9Web of Scienc

Bad news travels fast! | Notícia ruim corre depressa!

Many proverbs are created through everyday experience. Although many of them are readily understood by ordinary people, the more detailed view generates many questions and doubts related to their credibility. Motivated by one of these proverbs, in the present paper, we analyse propagation of news in the network of electronic contacts (e-mails). More specifically, we propose transmission protocols intended to reproduce properties of real systems. These protocols are simulated in a real e-mail network and in the random network proposed by p. Erdos and a. Rényi prize. The results suggest that news spreads faster in the random network. The hubs in the real network tend to attract the news, in prejudice to the less connected nodes

TLR2, TLR4 and the MYD88 Signaling Pathway Are Crucial for Neutrophil Migration in Acute Kidney Injury Induced by Sepsis

The aim of this study was to investigate the role of TLR2, TLR4 and MyD88 in sepsis-induced AKI. C57BL/6 TLR2(-/-), TLR4(-/-) and MyD88(-/-) male mice were subjected to sepsis by cecal ligation and puncture (CLP). Twenty four hours later, kidney tissue and blood samples were collected for analysis. the TLR2(-/-), TLR4(-/-) and MyD88(-/-) mice that were subjected to CLP had preserved renal morphology, and fewer areas of hypoxia and apoptosis compared with the wild-type C57BL/6 mice (WT). MyD88(-/-) mice were completely protected compared with the WT mice. We also observed reduced expression of proinflammatory cytokines in the kidneys of the knockout mice compared with those of the WT mice and subsequent inhibition of increased vascular permeability in the kidneys of the knockout mice. the WT mice had increased GR1(+low) cells migration compared with the knockout mice and decreased in GR1(+high) cells migration into the peritoneal cavity. the TLR2(-/-), TLR4(-/-), and MyD88(-/-) mice had lower neutrophil infiltration in the kidneys. Depletion of neutrophils in the WT mice led to protection of renal function and less inflammation in the kidneys of these mice. Innate immunity participates in polymicrobial sepsis-induced AKI, mainly through the MyD88 pathway, by leading to an increased migration of neutrophils to the kidney, increased production of proinflammatory cytokines, vascular permeability, hypoxia and apoptosis of tubular cells.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)National Institute of Science and Technology (INCT)Universidade Federal de São Paulo, Dept Med, Disciplina Nefrol, São Paulo, BrazilUniv São Paulo, Dept Imunol, Lab Imunobiol Transplantes, São Paulo, BrazilHosp Israelita Albert Einstein, IIEP, São Paulo, BrazilUniv Fed Triangulo Mineiro, Uberaba, BrazilUniversidade Federal de São Paulo, Dept Med, Disciplina Nefrol, São Paulo, BrazilFAPESP: 07/07139-3Web of Scienc

Assessment of the quality of professional life of nurses.

Context: The verification of quality of life at work (QLW) indices can provide information on factors that directly interfere with personal and collective satisfaction and motivation, with reflections on the excellence of the structure and service. Objective: To evaluate the quality of life at work of active nurses. Material and methods: descriptive and correlational, cross-sectional study with a quantitative approach, carried out with 104 nurses in the service of a tertiary public hospital, in the municipality of Aracaju/SE from August 2018 to July 2019. Results: Factors such as working conditions, safety and remuneration are degrading factors in the quality of life at work and these also have direct repercussions on health and the quality of nursing care provided. Conclusion: Low levels of quality of life at work have direct negative repercussions on nurses' health. It is suggested that further studies evaluate the measures taken by hospital institutions to investigate the effectiveness of quality of life at work in nursing.  Context: The verification of quality of life at work (QLW) indices can provide information on factors that directly interfere with personal and collective satisfaction and motivation, with reflections on the excellence of the structure and service. Objective: To evaluate the quality of life at work of active nurses. Material and methods: descriptive and correlational, cross-sectional study with a quantitative approach, carried out with 104 nurses in the service of a tertiary public hospital, in the municipality of Aracaju/SE from August 2018 to July 2019. Results: Factors such as working conditions, safety and remuneration are degrading factors in the quality of life at work and these also have direct repercussions on health and the quality of nursing care provided. Conclusion: Low levels of quality of life at work have direct negative repercussions on nurses' health. It is suggested that further studies evaluate the measures taken by hospital institutions to investigate the effectiveness of quality of life at work in nursing