Niels Olsen Saraiva Câmara

Beth Israel Deaconess Medical Center, Boston, Massachusetts, United States

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Publications (164)439.23 Total impact

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    ABSTRACT: Cisplatin treatment has been adopted in some chemotherapies; however, this drug can induce acute kidney injury due its ability to negatively affect renal function, augment serum levels of creatinine and urea, increase the acute tubular necrosis score and up-regulate cytokines (e.g., IL-1β and TNF-α). The kinin B2 receptor has been associated with the inflammation process, as well as the regulation of cytokine expression, and its deletion resulted in an improvement in the diabetic nephropathy status. To examine the role of the kinin B2 receptor in cisplatin-induced acute kidney injury, kinin B2 receptor knockout mice were challenged with cisplatin. Additionally, WT mice were treated with a B2 receptor antagonist after cisplatin administration. B2 receptor-deficient mice were less sensitive to this drug than the WT mice, as shown by reduced weight loss, better preservation of kidney function, down regulation of inflammatory cytokines and less acute tubular necrosis. Moreover, treatment with the kinin B2 receptor antagonist effectively reduced the levels of serum creatinine and blood urea after cisplatin administration. Thus, our data suggest that the kinin B2 receptor is involved in cisplatin-induced acute kidney injury by mediating the necrotic process and the expression of inflammatory cytokines, thus resulting in declined renal function. These results highlight the kinin B2 receptor antagonist treatment in amelioration of nephrotoxicity induced by cisplatin therapy.
    International Immunopharmacology. 09/2014; 22(1):115–119.
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    ABSTRACT: AIM: To investigate a potential protective role of the kinin B2 receptor in a glycerol-induced rhabdomyolysis mouse model. METHODS: We separated 28 C57Bl/6 male mice into 4 groups: untreated WT animals, untreated B2 knockout mice, glycerol-treated WT and glycerol-treated B2 knockout mice. Glycerol-treated animals received one intramuscular injections of glycerol solution (50% v/v, 7 mL/kg). After 48 h, urine and blood samples were collected to measure creatinine and urea levels. Additionally, kidney samples were extracted for histological evaluation, and the mRNA expression levels of kinin B1 and B2 receptors and inflammatory mediators were measured by real-time polymerase chain reaction. RESULTS: Serum creatinine and urea levels showed differences between untreated wild-type and glycerol-treated wild-type mice (0.66 ± 0.04 vs 2.61 ± 0.53 mg/dL, P < 0.01; and 33.51 ± 2.08 vs 330.2 ± 77.7 mg/dL, P < 0.005), and between untreated B2 knockout mice and glycerol-treated knockout mice (0.56 ± 0.03 vs 2.23 ± 0.87 mg/dL, P < 0.05; and 42.49 ± 3.2 vs 327.2 ± 58.4 mg/dL, P < 0.01), but there was no difference between the glycerol-treated wild-type and glycerol-treated knockout mice. Glycerol was able to induce a striking increase in kinin B2 receptor expression (> 30 times, 31.34 ± 8.9) in kidney. Animals injected with glycerol had a higher degree of tubular injury than untreated animals. Wild-type and knockout mice treated with glycerol intramuscularly present kidney injury, with impairment in renal function. However, B2 knockout mice treated with glycerol did not show a different phenotype regarding kidney injury markers, when compared to the wild-type glycerol-treated group. CONCLUSION: We conclude that the kinin B2 receptor does not have a protective role in renal injury.
    World Journal of Nephrology. 08/2014; 3(3):85.
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    ABSTRACT: Obesity is an important worldwide challenge that must be faced in most developed and developing countries because of unhealthy nutritional habits. The consequences of obesity and being overweight are observed in different organs, but the kidney is one of the most affected. Excess adipose tissue causes hemodynamic alterations in the kidney that can result in renal disease. However, obesity is also commonly associated with other comorbidities such as chronic inflammation, hypertension and diabetes. This association of several aggravating factors is still a matter of concern in clinical and basic research because the pathophysiologic mechanisms surrounding chronic kidney disease development in obese patients remain unclear. This review will discuss the consequences of obesity in the context of renal injury.
    World journal of nephrology. 08/2014; 3(3):50-63.
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    ABSTRACT: Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by chronic inflammation. This study sought to assess the effects of an exercise training program on cytokines and soluble TNF receptors in response to acute exercise in SLE women. Eight SLE women and ten sex-, age- and BMI-comparable healthy controls (HC) participated in this study. Prior to and after a 12-week aerobic exercise training program, cytokines and soluble TNF receptors were assessed at rest and in response to single bouts of acute moderate/intense exercise. HC performed the acute exercise bouts only at baseline. After the exercise training program, there was a decrease in resting sTNFR2 levels (P=0.025) and a tend to reduction IL-10 levels (P=0.093) in SLE. The resting levels of IL-6, IL-10, and TNF-α after the exercise training in SLE reached HC levels (P>0.05). In response to a single bout of acute moderate exercise, the area under the curve (AUC) of IL-10 was significantly reduced after the exercise training program in SLE (P=0.043), and the AUC of IL-10, IL-6, TNF-α, and sTNFR1 of SLE approached control values (P>0.05). In response to a single bout of acute intense exercise, the AUC of IL-10 was significantly reduced in SLE (P=0.015). Furthermore, the AUC of sTNFR2 tended to decrease after exercise training program in SLE (P=0.084), but it did not reach control values (P=0.001). An aerobic exercise training program attenuated the inflammatory milieu in SLE women, revealing a novel homeostatic immunomodulatory role of exercise in an autoimmunity condition.
    Journal of applied physiology (Bethesda, Md. : 1985). 07/2014;
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    ABSTRACT: To investigate a potential protective role of the kinin B2 receptor in a glycerol-induced rhabdomyolysis mouse model. We separated 28 C57Bl/6 male mice into 4 groups: untreated WT animals, untreated B2 ¬knockout mice, glycerol-treated WT and glycerol-treated B2 knockout mice. Glycerol-treated animals received intramuscular injections of glycerol solution (50% v/v, 7 mL/Kg). After 48 hours, urine and blood samples were collected to measure creatinine and urea levels. Additionally, kidney samples were extracted for histological evaluation, and the mRNA expression levels of kinin receptors and inflammatory mediators were measured by qRT-PCR. Serum creatinine and urea levels showed differences between untreated wild-type and glycerol-treated wild-type mice, and between untreated B2 knockout mice and glycerol-treated knockout mice, but there was no difference between the glycerol-treated wild-type and glycerol-treated knockout mice. Glycerol was able to induce a striking increase in kinin B2 receptor expression. Animals injected with glycerol had a high degree of tubular injury. We conclude that the kinin B2 receptor does not have a protective role in renal injury. Wild-type and knockout mice treated with glycerol intramuscularly present kidney injury, with impairment in renal function. However, B2 knockout mice treated with glycerol did not show a different phenotype, when compared to the wild-type glycerol-treated group.
    World Journal of Nephrology. 07/2014;
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    ABSTRACT: Cisplatin treatment has been adopted in some chemotherapies; however, this drug can induce acute kidney injury due its ability to negatively affect renal function, augment serum levels of creatinine and urea, increase the acute tubular necrosis score and up-regulate cytokines (e.g., IL-1β and TNF-α). The kinin B2 receptor has been associated with the inflammation process, as well as the regulation of cytokine expression, and its deletion resulted in an improvement in the diabetic nephropathy status. To examine the role of the kinin B2 receptor in cisplatin-induced acute kidney injury, kinin B2 receptor knockout mice were challenged with cisplatin. Additionally, WT mice were treated with a B2 receptor antagonist after cisplatin administration. B2 receptor-deficient mice were less sensitive to this drug than the WT mice, as shown by reduced weight loss, better preservation of kidney function, down regulation of inflammatory cytokines and less acute tubular necrosis. Moreover, treatment with the kinin B2 receptor antagonist effectively reduced the levels of serum creatinine and blood urea after cisplatin administration. Thus, our data suggest that the kinin B2 receptor is involved in cisplatin-induced acute kidney injury by mediating the necrotic process and the expression of inflammatory cytokines, thus resulting in declined renal function. These results highlight the kinin B2 receptor antagonist treatment in amelioration of nephrotoxicity induced by cisplatin therapy.
    International immunopharmacology. 06/2014;
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    ABSTRACT: Kidney injury, heart injury, and cytokine-induced vascular hyperpermeability are associated with high rates of morbidity and mortality in sepsis. Although the mechanism remains unknown, apolipoprotein A-I (apoA-I) mimetic peptide 4F reduces inflammation and protects high-density lipoprotein (HDL) levels, which are reduced in sepsis. We hypothesized that 4F also protects kidneys and hearts in a rat model of cecal ligation and puncture (CLP). We divided Wistar rats into groups: sham-operated (control); CLP; and CLP+4F (10 mg/kg body wt ip, 6 h after CLP). At 24 h post-CLP, we evaluated cardiac function, mean arterial pressure (MAP), heart rate (HR), baroreflex sensitivity, total cholesterol, low-density lipoprotein (LDL), HDL, serum cytokines, and inulin clearance. We performed immunoblotting for protein regulators of vascular permeability (Slit2 and Robo4) and endothelial nitric oxide synthase (eNOS) in kidney tissue. We evaluated heart mitochondria with electron microscopy. Although there was no difference in MAP, the HR was significantly higher in CLP rats than in control and CLP+4F rats. In CLP+4F rats, baroreflex sensitivity and cardiac function were completely protected from the effects of CLP, as was glomerular filtration; heart mitochondria morphology was improved; sepsis-induced changes in serum cholesterol, LDL, HDL, and ApoA-I were less common; all cytokines were lower than in CLP rats; and expression of Slit2, Robo4, and eNOS was completely restored. Administration of 4F inhibits inflammatory responses and strengthens the vascular barrier, protecting kidneys and hearts in an HDL-dependent manner. To determine the extent of the protective effect of 4F, further studies are needed.
    American journal of physiology. Regulatory, integrative and comparative physiology. 06/2014;
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    ABSTRACT: Formaldehyde (FA) is an environmental and occupational pollutant, and its toxic effects on the immune system have been shown. Nevertheless, no data are available regarding the programming mechanisms after FA exposure and its repercussions for the immune systems of offspring. In this study, our objective was to investigate the effects of low-dose exposure of FA on pregnant rats and its repercussion for the development of allergic lung inflammation in offspring. Pregnant Wistar rats were assigned in 3 groups: P (rats exposed to FA (0,75ppm, 1h/day, 5days/week, for 21days), C (rats exposed to vehicle of FA (distillated water) and B (rats non-manipulated). After 30days of age, the offspring was sensitized with ovalbumin (OVA)-alum and challenged with aerosolized OVA (1%, 15min, 3days). After 24h the OVA challenge the parameters were evaluated. Our data showed that low-dose exposure to FA during pregnancy induced low birth weight and suppressed the development of allergic lung inflammation and tracheal hyperresponsiveness in offspring by mechanisms mediated by reduced anaphilactic antibodies synthesis, IL-6 and TNF-alfa secretion. Elevated levels of IL-10 were found. Any systemic alteration was detected in the exposed pregnant rats, although oxidative stress in the uterine environment was evident at the moment of the delivery based on elevated COX-1 expression and reduced cNOS and SOD-2 in the uterus. Therefore, we show the putative programming mechanisms induced by FA on the immune system for the first time and the mechanisms involved may be related to oxidative stress in the fetal microenvironment.
    Toxicology and Applied Pharmacology 05/2014; · 3.98 Impact Factor
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    05/2014; 29 Suppl 3:iii90-iii101.
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    ABSTRACT: Abstract Objective: To evaluate the effects of folic acid (FA)-induced renal failure in young offspring of diabetic mothers. Methods: The offspring of streptozotocin-induced diabetic dams were divided into 4 groups: CC (controls receiving vehicle); DC (diabetics receiving vehicle); CA (controls receiving FA solution, 250 mg/kg); and DA (diabetics receiving FA solution, 250 mg/kg). Renal function tests and morphometry results were analyzed. Results: An increase in creatinine and urea levels was observed in CA and DA groups at 2 and 5 months. FA administration caused a significant reduction in the number of glomeruli in the offspring of diabetic dams. The diabetes group treated with FA had fewer glomeruli compared to controls at 2 and 5 months. FA caused an increase in the area of the urinary space both in controls and offspring of diabetic dams at 2 and 5 months. The number of glomeruli and area of the urinary space at 2 months were negatively correlated. Conclusions: Fetal programming promotes remarkable changes in kidney morphology and function in offspring. We suggest that the morphological changes in the kidneys are more pronounced when fetal programming is associated with newly acquired diseases, for example renal failure induced by FA.
    The journal of maternal-fetal & neonatal medicine: the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians 04/2014; · 1.36 Impact Factor
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    ABSTRACT: Focal and segmental glomerulosclerosis (FSGS) is one of the most important renal diseases related to end stage renal failure. Bradykinin has been implicated in the pathogenesis of renal inflammation whereas the role of its receptor 2 (B2RBK) in FSGS has not been studied. FSGS was induced in wild type and B2RBK KO mice by a single intravenous injection of Adriamycin (ADM). In order to further modulate the kinin receptors, animals were also treated with B2RBK antagonist HOE-140, and DALBK, B1RBK antagonist. Here, we show that the blockage of B2RBK with HOE-140 protects mice from FSGS development, including podocyte foot process effacement and reestablishment of slit diaphragm-related proteins. However, B2RBK KO mice were not protected from FSGS. These opposite results were due to B1RBK expression. B1RBK was up regulated after ADM injection and it was exacerbated in B2RBK KO animals. Further, HOE-140 treatment down regulated B1RBK receptor. The blockade of B1RBK in B2RBK KO animals promoted FSGS regression, with a less inflammatory phenotype. These results indicate a deleterious role of both kinin receptors in FSGS model and suggest a possible crosstalk of them in disease progression.
    Disease Models and Mechanisms 04/2014; · 4.96 Impact Factor
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    J Stem Cell Res Ther. 04/2014; 4(4):1-7.
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    ABSTRACT: Immunosuppressive drugs change gestational IDO activity at the maternal-fetal interface. Analysis of placental IDO expression and activity, interferon gamma (IFN-γ), and IL-10 expression and NFkB activity in renal transplant recipient women under immunosuppressive treatment. We demonstrated a significant reduction in IDO activity (P = 0.0275) and expression (P = 0.026) and in NFkB activity (P = 0.0176) in the villous region of renal transplanted mother. These findings did not correlate with the higher serum levels of kynurenine (P = 0.002). In the decidual compartment, IDO was immunolocalized mainly on the extravillous cytotrophoblast but did not show significant differences among the experimental groups; kynurenine was significantly higher (P = 0.036) and was inversely proportional to the decidual IFN-γ profile (P = 0.0433). No change was seen in IL-10 levels. NFkB activity was significantly higher in decidual compartment correlating with the higher IDO activity and suggesting that in immunosuppressant pregnancy, IDO activity and expression remain regulated by NFkB. The increased IDO activity in decidua may indicate an attempt to offset the low expression. These findings call attention to the relevance of IDO activity at the maternal interface in pregnant transplant recipients, likely modulated by immunosuppressive agents and associated with a high risk of associated gestational disorders.
    American Journal Of Reproductive Immunology 04/2014; · 3.32 Impact Factor
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    ABSTRACT: Leptin is an adipose-secreted hormone that plays an important role in both metabolism and immunity. Leptin has been shown to induce Th1 polarization and inhibit Th2 responses. Additionally, leptin induces Th17 responses, inhibits regulatory T (Treg) cells and modulates autoimmune diseases. Here, we investigated whether leptin mediates its activity on T cells by influencing dendritic cells (DCs) to promote Th17 and Treg cell immune responses in mice. We observed that leptin deficiency: i) reduced the expression of DC maturation markers, ii) decreased DC production of IL-12, TNF-α and IL-6, iii) increased DC production of TGF-β, and iv) limited the capacity of DCs to induce syngeneic CD4(+) T-cell proliferation. As a consequence of this unique phenotype, DCs generated under leptin-free conditions induced Treg or TH 17 cells more efficiently than DCs generated in the presence of leptin. These data indicate important roles for leptin in DC homeostasis and the initiation and maintenance of inflammatory and regulatory immune responses by DCs. This article is protected by copyright. All rights reserved.
    European Journal of Immunology 03/2014; · 4.97 Impact Factor
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    ABSTRACT: 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 (1.0µg/g) or leptin (1.0µg/g) followed by LPS (1.5µg/g) intranasally. Additionally, some animals were given LPS (1.5µg/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-α, IFN-γ, 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. © 2014 S. Karger AG, Basel.
    Cellular Physiology and Biochemistry 03/2014; 33(3):835-846. · 3.42 Impact Factor
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    ABSTRACT: High diesel exhaust particle levels are associated with increased health effects; however, knowledge on the impact of its chemical contaminant 1,2-naphthoquinone (1,2-NQ) is limited. We investigated whether postnatal and adult exposures to 1,2-NQ influence allergic reaction and the roles of innate and adaptive immunity. Male neonate (6 days) and adult (56 days) C57Bl/6 mice were exposed to 1,2-NQ (100 nM; 15 min) for 3 days, and on day 59, they were sensitized and later challenged with ovalbumin (OVA). Airway hyper-responsiveness (AHR) and production of cytokines, immunoglobulin E (IgE) and leukotriene B4 (LTB4) were measured in the airways. Postnatal exposure to 1,2-NQ activated dendritic cells in splenocytes by increasing expressing cell surface molecules (e.g., CD11c). Co-exposure to OVA effectively polarized T helper (Th) type 2 (Th2) by secreting Th2-mediated cytokines. Re-stimulation with unspecific stimuli (PMA and ionomycin) generated a mixed Th1 (CD4(+)/IFN-γ(+)) and Th17 (CD4(+)/IL-17(+)) phenotype in comparison with the vehicle-matched group. Postnatal exposure to 1,2-NQ did not induce eosinophilia in the airways at adulthood, although it evoked neutrophilia and exacerbated OVA-induced eosinophilia, Th2 cytokines, IgE and LTB4 production without affecting AHR and mast cell degranulation. At adulthood, 1,2-NQ exposure evoked neutrophilia and increased Th1/Th2 cytokine levels, but failed to affect OVA-induced eosinophilia. In conclusion, postnatal exposure to 1,2-NQ increases the susceptibility to antigen-induced asthma. The mechanism appears to be dependent on increased expression of co-stimulatory molecules, which leads to cell presentation amplification, Th2 polarization and enhanced LTB4, humoral response and Th1/Th2 cytokines. These findings may be useful for future investigations on treatments focused on pulmonary illnesses observed in children living in heavy polluted areas.
    Archives of Toxicology 02/2014; · 5.22 Impact Factor
  • Andrea Moro Caricilli, Angela Castoldi, Niels Olsen Saraiva Câmara
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    ABSTRACT: Our body is colonized by more than a hundred trillion commensals, represented by viruses, bacteria and fungi. This complex interaction has shown that the microbiome system contributes to the host's adaptation to its environment, providing genes and functionality that give flexibility of diet and modulate the immune system in order not to reject these symbionts. In the intestine, specifically, the microbiota helps developing organ structures, participates of the metabolism of nutrients and induces immunity. Certain components of the microbiota have been shown to trigger inflammatory responses, whereas others, anti-inflammatory responses. The diversity and the composition of the microbiota, thus, play a key role in the maintenance of intestinal homeostasis and explain partially the link between intestinal microbiota changes and gut-related disorders in humans. Tight junction proteins are key molecules for determination of the paracellular permeability. In the context of intestinal inflammatory diseases, the intestinal barrier is compromised, and decreased expression and differential distribution of tight junction proteins is observed. It is still unclear what is the nature of the luminal or mucosal factors that affect the tight junction proteins function, but the modulation of the immune cells found in the intestinal lamina propria is hypothesized as having a role in this modulation. In this review, we provide an overview of the current understanding of the interaction of the gut microbiota with the immune system in the development and maintenance of the intestinal barrier.
    World Journal Gastrointestinal Pathophysiology. 02/2014; 5(1):18-32.
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    ABSTRACT: Mesenchymal stem cells have prominent immune modulatory properties, which may have clinical applications; however their major source, bone marrow, is of limited availability. On the other hand, mesenchymal stem cells derived from human exfoliated deciduous teeth (SHEDs) are readily accessible, but their immune regulatory properties have not been completely investigated. This study was designed, therefore, to evaluate the SHEDs influence on DCs differentiation, maturation, ability to activate T cells and to expand CD4+Foxp3+ T cells.
    PLoS ONE 01/2014; 9(5):e98050. · 3.53 Impact Factor
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    ABSTRACT: Nasal polyposis is a severe, chronic inflammatory condition of the paranasal sinuses and is frequently associated with asthma and aspirin sensitivity. Mesenchymal stem cells exhibit a potent immunosuppressive effect in several inflammatory conditions, and their role in nasal polyposis remains little explored. Hence, we investigated whether bone marrow-derived mesenchymal stem cells could modulate cell phenotype in the nasal polyp milieu. After coculture with mesenchymal stem cells, the frequency of these inflammatory cells was found to decrease. Furthermore, mesenchymal stem cells promoted strong inhibition of CD4+ and CD8+ T cell proliferation, increased the frequency of CD4+CD25+Foxp3 T cells, and changed the global cytokine profile from an inflammatory to an anti-inflammatory response. We believe that mesenchymal stem cells may be a very useful adjunct for investigation of the inflammatory process in nasal polyposis, contributing to better understanding of the inflammatory course of this condition.
    Mediators of Inflammation 01/2014; 2014:583409. · 3.88 Impact Factor

Publication Stats

1k Citations
439.23 Total Impact Points

Institutions

  • 2013–2014
    • Beth Israel Deaconess Medical Center
      Boston, Massachusetts, United States
  • 2005–2014
    • University of São Paulo
      • • Department of Immunology (ICB)
      • • Departamento de Neurologia (FM) (São Paulo)
      San Paulo, São Paulo, Brazil
    • Federal University of Juiz de Fora
      • Departamento de Nefrologia
      Juiz de Fora, Estado de Minas Gerais, Brazil
  • 1999–2014
    • Universidade Federal de São Paulo
      • • Departamento de Medicina
      • • School of Medicine
      San Paulo, São Paulo, Brazil
  • 2010–2012
    • Pontifícia Universidade Católica do Paraná (PUC-PR)
      Curityba, Paraná, Brazil
  • 2009
    • Universidade José do Rosário Vellano – UNIFENAS
      San Paulo, São Paulo, Brazil
  • 2008
    • University of Campinas
      Conceição de Campinas, São Paulo, Brazil