Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 89
Filtrar
1.
Parasitol Res ; 123(5): 217, 2024 May 22.
Artigo em Inglês | MEDLINE | ID: mdl-38772951

RESUMO

Toxoplasmosis poses a global health threat, ranging from asymptomatic cases to severe, potentially fatal manifestations, especially in immunocompromised individuals and congenital transmission. Prior research suggests that oregano essential oil (OEO) exhibits diverse biological effects, including antiparasitic activity against Toxoplasma gondii. Given concerns about current treatments, exploring new compounds is important. This study was to assess the toxicity of OEO on BeWo cells and T. gondii tachyzoites, as well as to evaluate its effectiveness in in vitro infection models and determine its direct action on free tachyzoites. OEO toxicity on BeWo cells and T. gondii tachyzoites was assessed by MTT and trypan blue methods, determining cytotoxic concentration (CC50), inhibitory concentration (IC50), and selectivity index (SI). Infection and proliferation indices were analyzed. Direct assessments of the parasite included reactive oxygen species (ROS) levels, mitochondrial membrane potential, necrosis, and apoptosis, as well as electron microscopy. Oregano oil exhibited low cytotoxicity on BeWo cells (CC50: 114.8 µg/mL ± 0.01) and reduced parasite viability (IC50 12.5 ± 0.06 µg/mL), demonstrating 9.18 times greater selectivity for parasites than BeWo cells. OEO treatment significantly decreased intracellular proliferation in infected cells by 84% after 24 h with 50 µg/mL. Mechanistic investigations revealed increased ROS levels, mitochondrial depolarization, and lipid droplet formation, linked to autophagy induction and plasma membrane permeabilization. These alterations, observed through electron microscopy, suggested a necrotic process confirmed by propidium iodide labeling. OEO treatment demonstrated anti-T. gondii action through cellular and metabolic change while maintaining low toxicity to trophoblastic cells.


Assuntos
Autofagia , Óleos Voláteis , Origanum , Espécies Reativas de Oxigênio , Toxoplasma , Óleos Voláteis/farmacologia , Óleos Voláteis/química , Toxoplasma/efeitos dos fármacos , Toxoplasma/crescimento & desenvolvimento , Origanum/química , Humanos , Autofagia/efeitos dos fármacos , Espécies Reativas de Oxigênio/metabolismo , Linhagem Celular , Antiprotozoários/farmacologia , Concentração Inibidora 50 , Necrose/tratamento farmacológico , Sobrevivência Celular/efeitos dos fármacos , Apoptose/efeitos dos fármacos , Potencial da Membrana Mitocondrial/efeitos dos fármacos
2.
Exp Parasitol ; 241: 108343, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-35944696

RESUMO

Toxoplasma gondii, a protozoan parasite, is responsible for toxoplasmosis. The available therapy for patients with toxoplasmosis involves a combination of pyrimethamine and sulfadiazine, which have several adverse effects, including bone marrow suppression, megaloblastic anemia, leukopenia, and granulocytopenia. The development of therapeutic alternatives is essential for the management of toxoplasmosis, emphasizing the recent advances in nanomedicine. This study aimed to evaluate the in vitro effects of biogenic silver nanoparticles (AgNp-Bio) on tachyzoite forms and Leydig cells infected with T. gondii. We observed that the AgNp-Bio reduced the viability of the tachyzoites and did not exhibit cytotoxicity against Leydig cells at low concentrations. Additionally, treatment with AgNp-Bio reduced the rate of infection and proliferation of the parasite, and lowered the testosterone levels in the infected cells. It increased the levels of IL-6 and TNF-α and reduced the levels of IL- 10. Among the morphological and ultrastructural changes, AgNp-Bio induced a reduction in the number of intracellular tachyzoites and caused changes in the tachyzoites with accumulation of autophagic vacuoles and a decrease in the number of tachyzoites inside the parasitophorous vacuoles. Collectively, our data demonstrate that the AgNp-Bio affect T. gondii tachyzoites by activating microbicidal and inflammatory mechanisms and could be a potential alternative treatment for toxoplasmosis.


Assuntos
Nanopartículas Metálicas , Toxoplasma , Toxoplasmose , Humanos , Interleucina-6 , Células Intersticiais do Testículo , Masculino , Nanopartículas Metálicas/uso terapêutico , Nanopartículas Metálicas/toxicidade , Prata/toxicidade , Testosterona , Fator de Necrose Tumoral alfa
3.
Parasite Immunol ; 43(1): e12793, 2021 01.
Artigo em Inglês | MEDLINE | ID: mdl-32969488

RESUMO

AIMS: To describe an anti-Strongyloides IgA, IgG and IgG immune complex antibody response profile in patients with pulmonary tuberculosis. METHODS AND RESULTS: Saliva and serum samples were collected from 100 individuals: group I, 50 apparently healthy individuals; and group II, 50 pulmonary tuberculosis patients. The IgA, IgG and IgG immune complex detection were carried out via an ELISA immunoenzymatic test. Optical density medians in saliva samples of IgA antibody (median of 7.21) and IgG-IC (median of 4.95) were significantly higher in tuberculosis group compared to control individuals (median IgA of 3.93 and IgG-IC of 2.38). CONCLUSION: This study presents antibody data to the field of pulmonary tuberculosis and strongyloidiasis coinfection, including saliva samples, and especially IgG immune complex detection.


Assuntos
Anticorpos Antiprotozoários/sangue , Complexo Antígeno-Anticorpo/sangue , Imunoglobulina A/sangue , Imunoglobulina G/sangue , Strongyloides/imunologia , Adulto , Animais , Ensaio de Imunoadsorção Enzimática , Feminino , Humanos , Larva/imunologia , Masculino , Pessoa de Meia-Idade , Saliva/imunologia , Estrongiloidíase/imunologia , Estrongiloidíase/patologia , Tuberculose Pulmonar/patologia
4.
Parasitology ; 148(12): 1447-1457, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-34187608

RESUMO

Toxoplasma gondii is the causative agent of toxoplasmosis, and an important problem of public health. The current treatment for toxoplasmosis is the combination of pyrimethamine and sulphadiazine, which do not act in the chronic phase of toxoplasmosis and have several side-effects. This study evaluated the anti-T. gondii activity and potential mechanism of Moringa oleifera seeds' aqueous extract in vitro. The concentration of M. oleifera extract in HeLa cells was determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide cell viability assays. The presence of T. gondii was assessed by quantitative polymerase chain reaction and toluidine blue staining. Pyrimethamine and sulphadiazine were used as drug controls. Modifications in T. gondii morphology and ultrastructure were observed by electron microscopy. In vitro, the M. oleifera extract had no toxic effect on HeLa cells at concentrations below 50 µg mL−1. Moringa oleifera extract inhibits T. gondii invasion and intracellular proliferation with similar results for sulphadiazine + pyrimethamine, and also shows cellular nitric oxide production at a concentration of 30 µg mL−1. Electron microscopy analyses indicated structural and ultrastructural modifications in tachyzoites after treatment. We also observed an increase in reactive oxygen species production and a loss of mitochondrial membrane integrity. Nile Red staining assays demonstrated a lipid accumulation. Annexin V­fluorescein isothiocyanate and propidium iodide staining demonstrated that the main action of M. oleifera extract in T. gondii tachyzoites was compatible with late apoptosis. In conclusion, M. oleifera extract has anti-T. gondii activity in vitro and might be a promising substance for the development of a new anti-T. gondii drug.


Assuntos
Moringa oleifera , Toxoplasma , Toxoplasmose , Apoptose , Células HeLa , Humanos , Moringa oleifera/química , Toxoplasmose/tratamento farmacológico
5.
Exp Parasitol ; 211: 107853, 2020 Feb 17.
Artigo em Inglês | MEDLINE | ID: mdl-32061628

RESUMO

The highlights of biogenic silver nanoparticles (AgNp-Bio) include low toxicity - depending on size and concentration - and efficient antiparasitic activity. Therefore, the objective of this study was to assess the action of the AgNp-Bio on HeLa cells in an infection with strain of RH Toxoplasma gondii. Firstly, we performed a cellular viability test and characterized the AgNp-Bio to proceed with the infection of HeLa cells with T. gondii to be treated using AgNp-Bio or conventional drugs. Subsequently, we determined the level of standard cytokines Th1/Th2 as well as the content of nitric oxide (NO) and reactive oxygen species (ROS). Results indicated a mean size of 69 nm in diameter for the AgNp-Bio and obtained a dose-dependent toxicity. In addition, the concentrations of 3 and 6 µM promoted a significant decrease in adherence, infection, and intracellular proliferation. We also found lower IL-8 and production of inflammatory mediators. Thus, the nanoparticles reduced the adherence, infection, and proliferation of ROS and NO, in addition to immunomodulating the IL-8. Therefore, our data proved relevant to introduce a promising therapeutic alternative to toxoplasmosis.

6.
J Virol ; 92(10)2018 05 15.
Artigo em Inglês | MEDLINE | ID: mdl-29514900

RESUMO

Dengue virus (DV) infection can cause either a self-limiting flu-like disease or a threatening hemorrhage that may evolve to shock and death. A variety of cell types, such as dendritic cells, monocytes, and B cells, can be infected by DV. However, despite the role of T lymphocytes in the control of DV replication, there remains a paucity of information on possible DV-T cell interactions during the disease course. In the present study, we have demonstrated that primary human naive CD4+ and CD8+ T cells are permissive for DV infection. Importantly, both T cell subtypes support viral replication and secrete viable virus particles. DV infection triggers the activation of both CD4+ and CD8+ T lymphocytes, but preactivation of T cells reduces the susceptibility of T cells to DV infection. Interestingly, the cytotoxicity-inducing protein granzyme A is highly secreted by human CD4+ but not CD8+ T cells after exposure to DV in vitro Additionally, using annexin V and polycaspase assays, we have demonstrated that T lymphocytes, in contrast to monocytes, are resistant to DV-induced apoptosis. Strikingly, both CD4+ and CD8+ T cells were found to be infected with DV in acutely infected dengue patients. Together, these results show that T cells are permissive for DV infection in vitro and in vivo, suggesting that this cell population may be a viral reservoir during the acute phase of the disease.IMPORTANCE Infection by dengue virus (DV) causes a flu-like disease that can evolve to severe hemorrhaging and death. T lymphocytes are important cells that regulate antibody secretion by B cells and trigger the death of infected cells. However, little is known about the direct interaction between DV and T lymphocytes. Here, we show that T lymphocytes from healthy donors are susceptible to infection by DV, leading to cell activation. Additionally, T cells seem to be resistant to DV-induced apoptosis, suggesting a potential role as a viral reservoir in humans. Finally, we show that both CD4+ and CD8+ T lymphocytes from acutely infected DV patients are infected by DV. Our results raise new questions about DV pathogenesis and vaccine development.


Assuntos
Apoptose/imunologia , Linfócitos T CD4-Positivos/virologia , Linfócitos T CD8-Positivos/virologia , Vírus da Dengue/imunologia , Dengue/imunologia , Ativação Linfocitária/imunologia , Adolescente , Adulto , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD8-Positivos/imunologia , Células Cultivadas , Dengue/virologia , Vírus da Dengue/fisiologia , Feminino , Granzimas/metabolismo , Humanos , Masculino , Pessoa de Meia-Idade , Replicação Viral/imunologia , Adulto Jovem
8.
Cytokine ; 106: 35-39, 2018 06.
Artigo em Inglês | MEDLINE | ID: mdl-29549721

RESUMO

This study detected and compared the levels of IFN-γ, TNF-α, TGF-ß and nitric oxide (NO) in amniotic fluid (AF) and serum of pregnancies with acute toxoplasmosis, Southern Brazil. It also was compared the levels of the same mediators in the serum of pregnancies in acute and chronic toxoplasmosis with non-infected. Serological investigation, anti-T gondii IgM and IgG, of the 67 pregnancies was determined by Elisa MEIA. Forty two were uninfected, eight in chronic phase and 17 in acute phase. Among the acute phase, seven agreed to amniocentesis. The cytokines, in serum and in AF, were assessed by sandwich ELISA, and NO was estimated from the nitrite measurement with Griess reagent. The IFN-γ and TGF-ß levels in the AF and blood were similar, while TNF-α levels was lower in the AF. On the other hand, NO was higher in the AF. Chronically infected pregnant women have showed lower levels of INF-γ than those in acute and uninfected pregnancies. The serological levels of TNF-α were lower in pregnancies with toxoplasmosis, when compared with non-infected. TGF-ß levels were higher in pregnancies in acute phase when compared with uninfected or chronically infected. NO in the serum of the infected had lower levels than those non-infected. In summary, higher concentrations of NO and lower levels of TNF-α were observed in the AF than in the serum of acute pregnancies, while TGF-ß e INF-γ levels were similar in both biological material. In the serum of infected pregnancies was observed decrease in inflammatory mediators and increase of TGF-ß.


Assuntos
Líquido Amniótico/metabolismo , Interferon gama/sangue , Óxido Nítrico/sangue , Toxoplasmose/sangue , Fator de Crescimento Transformador beta/sangue , Fator de Necrose Tumoral alfa/sangue , Brasil , Feminino , Humanos , Gravidez
9.
Cytokine ; 108: 127-135, 2018 08.
Artigo em Inglês | MEDLINE | ID: mdl-29602156

RESUMO

INTRODUCTION: A complex network of cytokines in the bone marrow microenvironment has been implicated as an important factor in the pathogenesis of multiple myeloma (MM). Different cytokines have been studied in MM, both in peripheral blood and/or bone marrow, but there are few data correlating cytokines in leukapheresis product with post-transplant response depth to treatment. MATERIALS AND METHODS: In a retrospective cross-sectional study, levels of tumor necrosis factor alpha (TNF-α), transforming growth factor beta-1 (TGF-ß1) and interferon gamma (IFN-γ) in peripheral hematopoietic stem cells/leukapheresis product (PHSC) of patients with MM eligible for transplantation were evaluated. Association of these cytokines with certain factors such as mobilized CD34 + cells/kg, staging, response to treatment and outcome were analyzed. RESULTS: The median baseline IFN-γ level was 826.4 pg/mL. IFN-γ levels in the leukapheresis product were significantly lower in patients who achieved complete response (CR) three months post-transplant when compared to patients with very good partial response (VGPR) (674.75 ±â€¯80.32 pg/mL versus 939.6 ±â€¯106.8 pg/mL, p = 0.02), respectively. Patients who lost depth of response at the third-month post-transplant had a median level of IFN-γ 1133, being considered "high-expressors" of IFN-γ, while those reaching improved response were called "low-expressors" (median level IFN-γ 485 pg/mL). Overall and progression-free survival did not have a statistically significant correlation with TNF-α, TGF-ß1 or IFN-γ, as well as TNF-α and TGF-ß1 levels in post-transplant response assessment. CONCLUSION: IFN-γ in PHSC seems to be an important biomarker of loss of response in MM, suggesting a role in early post-transplant therapeutic management.


Assuntos
Mobilização de Células-Tronco Hematopoéticas , Células-Tronco Hematopoéticas/imunologia , Interferon gama/imunologia , Mieloma Múltiplo/imunologia , Biomarcadores/análise , Biomarcadores/sangue , Estudos Transversais , Feminino , Transplante de Células-Tronco Hematopoéticas , Humanos , Leucaférese , Masculino , Pessoa de Meia-Idade , Prognóstico , Estudos Retrospectivos , Fatores de Risco , Fator de Crescimento Transformador beta1/imunologia , Transplantados , Fator de Necrose Tumoral alfa/imunologia
10.
Immunopharmacol Immunotoxicol ; 40(5): 387-392, 2018 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-30183425

RESUMO

The context of the article: Leishmania amazonensis has a wide geographical distribution throughout South American countries and can cause self-healing to severe cases as mucocutaneous or visceral forms. Leishmaniasis presents a balance of inflammatory and anti-inflammatory cytokines which is responsible for promoting the activation of phagocytes, essential to control the infection and lead to tissue repair/resolution of the disease, respectively. Results and discussion: Our model revealed that the treatment with Con-A was capable to stimulate human PBMC cells by increasing the phagocytic capacity and promoting parasite elimination. The pretreatment with Con-A promoted inflammatory (IFN-γ, TNF-α, IL-2 and IL-6) and anti-inflammatory (IL-4 and IL-10) cytokines production, increased the reactive oxygen species (ROS) sinthesys as well as the expression and presence of iNOS enzyme, but not nitric oxide production. Conclusion: Based on the data obtained, it was possible to infer that Con-A induces the ROS production, responsible for eliminating parasites in addition to regulatory cytokines synthesis which are important for disease resolution.


Assuntos
Antiprotozoários/farmacologia , Concanavalina A/farmacologia , Leishmania/efeitos dos fármacos , Leucócitos Mononucleares/efeitos dos fármacos , Espécies Reativas de Oxigênio/metabolismo , Animais , Células Cultivadas , Citocinas/biossíntese , Voluntários Saudáveis , Humanos , Imunidade Celular/efeitos dos fármacos , Leucócitos Mononucleares/imunologia , Leucócitos Mononucleares/metabolismo , Leucócitos Mononucleares/parasitologia , Óxido Nítrico Sintase Tipo II/genética , Fagócitos/efeitos dos fármacos , Fagócitos/imunologia , Fagócitos/metabolismo , Fagócitos/parasitologia
11.
Mol Carcinog ; 56(3): 913-922, 2017 03.
Artigo em Inglês | MEDLINE | ID: mdl-27585117

RESUMO

Colorectal Cancer (CRC) is the third most frequent type of cancer worldwide. In the past few years, studies have revealed a protective effect of metformin (MET-an anti-hyperglycemic drug, used to treat type 2 diabetes), against CRC. The protective effect of MET has been associated with AMPK activation (and mTOR inhibition), resulting in suppressed protein synthesis, and reduced cell proliferation in malignant transformed cells. To elucidate new mechanisms for the protective effect of metformin, we evaluated the oxidative stress and inflammatory process modulation, since these processes are strictly involved in colorectal carcinogenesis. The present study evaluated the protective effect of MET in a CRC model induced by 1,2-dimethylhydrazine (DMH) in Balb/c female mice. The simultaneous/continuous treatment (administration of MET and DMH simultaneously), revealed protective activity of MET, preventing the formation of aberrant crypt foci (ACF) in 71.4% at distal colon sections, and was able to restore basal labeling of apoptosis. Treatment with MET also reduced the inflammatory process induced by DMH, resulting in of the reduction of oxidative stress and nitric oxide related parameters. © 2016 Wiley Periodicals, Inc.


Assuntos
1,2-Dimetilidrazina/toxicidade , Focos de Criptas Aberrantes/prevenção & controle , Neoplasias Colorretais/prevenção & controle , Metformina/administração & dosagem , Proteínas Quinases Ativadas por AMP/metabolismo , Focos de Criptas Aberrantes/induzido quimicamente , Focos de Criptas Aberrantes/imunologia , Focos de Criptas Aberrantes/metabolismo , Animais , Proliferação de Células/efeitos dos fármacos , Neoplasias Colorretais/induzido quimicamente , Neoplasias Colorretais/imunologia , Neoplasias Colorretais/metabolismo , Feminino , Metformina/farmacologia , Camundongos , Neoplasias Experimentais , Estresse Oxidativo/efeitos dos fármacos , Transdução de Sinais/efeitos dos fármacos , Resultado do Tratamento
12.
Cell Immunol ; 311: 22-27, 2017 01.
Artigo em Inglês | MEDLINE | ID: mdl-27702443

RESUMO

American Tegumentar Leishmaniasis (ATL) is an infectious disease caused by Leishmania parasites with ineffective treatment. The properties of propolis have been studied in different experimental studies, however, few works have investigated the effects of propolis on human-derived peripheral blood mononuclear cells (PBMC) in leishmaniasis models. Thus, we investigate the immunomodulatory effects of propolis treatment on PBMC from ATL patients and on PBMC from healthy donors infected with Leishmania braziliensis. Our data demonstrate that propolis pretreatment shows immunomodulatory effects on both healthy donors and ATL patients adherent cells, increasing IL-4 and IL-17 and decreasing IL-10, in either the presence or absence of the L. braziliensis infection, demonstrating that propolis contributes with the decrease of the inflammation and could also contribute with parasite control.


Assuntos
Anti-Inflamatórios/uso terapêutico , Leishmania braziliensis/imunologia , Leishmaniose/imunologia , Leucócitos Mononucleares/efeitos dos fármacos , Própole/uso terapêutico , Pele/patologia , Adulto , Idoso , Brasil , Citocinas/metabolismo , Feminino , Humanos , Imunomodulação , Leucócitos Mononucleares/fisiologia , Masculino , Pessoa de Meia-Idade , Óxido Nítrico/metabolismo , Pele/parasitologia
13.
Exp Parasitol ; 181: 75-81, 2017 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-28774497

RESUMO

Due to the toxicity of conventional medication in toxoplasmosis, some drugs are being studied for treating this infection, such as statins, especially rosuvastatin compound, which is efficient in inhibiting the initial isoprenoid biosynthesis processes in humans and the parasite. The goal of this study was to assess the activity of rosuvastatin in HeLa cells infected with the RH strain of T. gondii. In the experiment, HeLa cells (1 × 105) were infected with tachyzoites of T. gondii (5 × 105). After the experimental infection, we assessed the number of infected cells and the amount of intracellular tachyzoites. In addition, culture supernatants were collected to determine the amount of cytokines by cytometric bead array. We observed that there was no cytotoxicity in the concentrations tested in this cell line. The effect of rosuvastatin showed a significant reduction in both the number of infected cells and the proliferation index of the intracellular parasite, when compared with the conventional treatment combining sulfadiazine and pyrimethamine for toxoplasmosis. There were also reduced levels of cytokines IL-6 and IL-17. Therefore, it was concluded that rosuvastatin exhibited antiproliferative activity. The data presented are significant to promote further studies and the search for alternative treatment for toxoplasmosis.


Assuntos
Células HeLa/parasitologia , Inibidores de Hidroximetilglutaril-CoA Redutases/farmacologia , Rosuvastatina Cálcica/farmacologia , Toxoplasma/efeitos dos fármacos , Análise de Variância , Antiprotozoários/farmacologia , Meios de Cultura , Células HeLa/efeitos dos fármacos , Humanos , Inibidores de Hidroximetilglutaril-CoA Redutases/toxicidade , Interleucina-17/metabolismo , Interleucina-6/metabolismo , Pirimetamina/farmacologia , Rosuvastatina Cálcica/toxicidade , Sulfadiazina/farmacologia , Toxoplasma/imunologia
14.
Parasitol Res ; 116(2): 465-475, 2017 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-27933392

RESUMO

The complex life cycle and immunopathological features underpinning the interaction of Leishmania parasites and their mammalian hosts poses frequent poorly explored and inconclusively resolved questions. The altered nociceptive signals over the course of leishmaniasis remain an intriguing issue for nociceptive and parasitology researchers. Experimental investigations have utilized behavioral, morphological, and neuro-immune approaches in the study of experimental cutaneous leishmaniasis (CL). The data generated indicates new venues for the study of the pathological characteristics of nociceptive processing in this parasitic disease. Leishmania-induced pain may be easily observed in mice and rats. However, nociceptive data is more complex in human investigations, including the occurrence of painless lesions in mucocutaneous and cutaneous leishmaniasis. Data from recent decades indicate that humans can also be affected by pain-related symptoms, often distinct from the region of body infection. The molecular and cellular mechanisms underlying such variable nociceptive states in humans during the course of leishmaniasis are an active area of research. The present article reviews nociception in leishmaniasis, including in experimental models of CL and clinical reports.


Assuntos
Leishmania/fisiologia , Leishmaniose Cutânea/psicologia , Dor Nociceptiva/etiologia , Animais , Modelos Animais de Doenças , Humanos , Leishmaniose Cutânea/parasitologia , Nociceptividade
15.
Parasitol Res ; 116(6): 1603-1615, 2017 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-28477099

RESUMO

Toxoplasmosis is an infectious disease caused by the intracellular parasite Toxoplasma gondii that affects about one third of the world's population. The diagnosis of this disease is carried out by parasite isolation and host antibodies detection. However, the diagnosis presents problems in regard to test sensitivity and specificity. Currently, the most effective T. gondii treatment is a combination of pyrimethamine and sulfadiazine, although both drugs are toxic to the host. In addition to the problems that compromise the effective diagnosis and treatment of toxoplasmosis, there are no reports or indications of any vaccine capable of fully protecting against this infection. Nanomaterials, smaller than 1000 nm, are currently being investigated as an alternative tool in the management of T. gondii infection. This article reviews how recent nanotechnology advances indicate the utility of nanomaterials in toxoplasmosis diagnosis, treatment, and vaccine development.


Assuntos
Nanoestruturas/uso terapêutico , Vacinas Protozoárias/imunologia , Toxoplasma/imunologia , Toxoplasmose/prevenção & controle , Animais , Humanos
16.
Virol J ; 13: 93, 2016 Jun 06.
Artigo em Inglês | MEDLINE | ID: mdl-27267473

RESUMO

BACKGROUND: We report the isolation and characterization of dengue virus (DENV) serotype 4 from a resident of Santa Fé, state of Paraná, South Brazil, in March 2013. This patient presented with hemorrhagic manifestations, high viral load and, interestingly, a mixed Th1/Th17 cytokine profile. CASE PRESENTATION: The patient presented with classical dengue symptoms, such as fever, rash, myalgia, arthralgia, and hemorrhagic manifestations including petechiae, gum bleeding and a positive tourniquet test result. A serum sample obtained 1 day after the initial appearance of clinical symptoms was positive for NS1 viral antigen, but this sample was negative for both IgM and IgG against DENV. Dengue virus infection was confirmed by isolation of the virus from C6/36 cells, and dengue virus serotyping was performed via one-step RT-PCR. The infection was confirmed to be caused by a serotype 4 dengue virus. Additionally, based on multiple alignment and phylogeny analyses of its complete genome sequence, the viral strain was classified as genotype II (termed LRV13/422). Moreover, a mixed Th1/Th17 cytokine profile was detected in the patient's serum, and this result demonstrated significant inflammation. Biological characterization of the virus via in vitro assays comparing LRV13/422 with a laboratory-adapted reference strain of dengue virus serotype 4 (TVP/360) showed that LRV13/422 infects both vertebrate and invertebrate cell lines more efficiently than TVP/360. However, LRV13/422 was unable to inhibit type I interferon responses, as suggested by the results obtained for other dengue virus strains. Furthermore, LRV13/422 is the first completely sequenced serotype 4 dengue virus isolated in South Brazil. CONCLUSION: The high viral load and mixed Th1/Th17 cytokine profile observed in the patient's serum could have implications for the development of the hemorrhagic signs observed, and these potential relationships can now be further studied using suitable animal models and/or in vitro systems.


Assuntos
Citocinas/sangue , Vírus da Dengue/isolamento & purificação , Dengue/patologia , Dengue/virologia , Genótipo , Sorogrupo , Carga Viral , Animais , Brasil , Linhagem Celular , Análise por Conglomerados , Vírus da Dengue/classificação , Vírus da Dengue/genética , Humanos , Invertebrados , Masculino , Pessoa de Meia-Idade , Filogenia , Reação em Cadeia da Polimerase Via Transcriptase Reversa , Análise de Sequência de DNA , Células Th1/imunologia , Células Th17/imunologia , Vertebrados , Cultura de Vírus
17.
Mediators Inflamm ; 2016: 2631625, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27795620

RESUMO

Parasites of the genus Leishmania are capable of inhibiting effector functions of macrophages. These parasites have developed the adaptive ability to escape host defenses; for example, they inactivate the NF-κB complex and suppress iNOS expression in infected macrophages, which are responsible for the production of the major antileishmanial substance nitric oxide (NO), favoring then its replication and successful infection. Metal complexes with NO have been studied as potential compounds for the treatment of certain tropical diseases, such as ruthenium compounds, known to be exogenous NO donors. In the present work, the compound cis-[Ru(bpy)2SO3(NO)]PF6, or RuNO, showed leishmanicidal activity directly and indirectly on promastigote forms of Leishmania (Leishmania) amazonensis. In addition, treatment with RuNO increased NO production by reversing the depletion of NO caused by Leishmania. We also found increased expression of Akt, iNOS, and NF-κB in infected and treated macrophages. These results demonstrated that RuNO was able to kill the parasite by NO release and modulate the transcriptional capacity of the cell.


Assuntos
Antiprotozoários/farmacologia , Leishmania/efeitos dos fármacos , Óxido Nítrico Sintase Tipo II/metabolismo , Compostos Nitrosos/farmacologia , Compostos de Rutênio/farmacologia , Animais , Sobrevivência Celular/efeitos dos fármacos , Ativação Enzimática/efeitos dos fármacos , Imuno-Histoquímica , Macrófagos Peritoneais/efeitos dos fármacos , Macrófagos Peritoneais/metabolismo , Camundongos , Camundongos Endogâmicos BALB C , NF-kappa B/metabolismo , Óxido Nítrico/metabolismo , Fagocitose/efeitos dos fármacos , Proteínas Proto-Oncogênicas c-akt/metabolismo
18.
Parasitol Res ; 115(4): 1557-66, 2016 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-26711452

RESUMO

Experimental models of mouse paw infection with L. amazonensis show an induction of a strong inflammatory response in the skin, and parasitic migration may occur to secondary organs with consequent tissue injury. There are few studies focusing on the resolution of damage in secondary organs caused by Leishmania species-related cutaneous leishmaniasis. We investigated the propolis treatment effect on liver inflammation induced by Leishmania amazonensis infection in the mouse paw. BALB/c mice were infected in the hind paw with L. amazonensis (10(7)) promastigote forms. After 15 days, animals were treated daily with propolis (5 mg/kg), Glucantime (10 mg/kg), or with propolis plus Glucantime combined. After 60 days, mice were euthanized and livers were collected for inflammatory process analysis. Liver microscopic analysis showed that propolis reduced the inflammatory process compared to untreated infected control. There was a decrease of liver myeloperoxidase and N-acetyl-ß-glucosaminidase activity levels, collagen fiber deposition, pro-inflammatory cytokine production, and plasma aspartate transaminase and alanine transaminase levels. Furthermore, propolis treatment enhanced anti-inflammatory cytokine levels and reversed hepatosplenomegaly. Our data demonstrated that daily low doses of Brazilian propolis reduced the secondary chronic inflammatory process in the liver caused by L. amazonensis subcutaneous infection in a susceptible mice strain.


Assuntos
Inflamação/tratamento farmacológico , Leishmaniose Cutânea/parasitologia , Própole/uso terapêutico , Animais , Citocinas/biossíntese , Inflamação/parasitologia , Leishmania mexicana/efeitos dos fármacos , Leishmaniose Cutânea/complicações , Fígado/efeitos dos fármacos , Fígado/parasitologia , Masculino , Meglumina , Antimoniato de Meglumina , Camundongos , Camundongos Endogâmicos BALB C , Compostos Organometálicos
19.
Biomed Pharmacother ; 170: 115979, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-38061138

RESUMO

Lung cancer is one of the leading causes of cancer-related deaths in men and women worldwide. Current treatments have limited efficacy, cause significant side effects, and cells can develop drug resistance. New therapeutic strategies are needed to discover alternative anticancer agents with high efficacy and low-toxicity. TMBP, a biphenyl obtained by laccase-biotransformation of 2,6-dimethoxyphenol, possesses antitumor activity against A549 adenocarcinoma cells. Without causing damage to sheep erythrocytes and mouse peritoneal macrophages of BALB/c mice. In addition to being classified as a good oral drug according to in-silico studies. This study evaluated the in-vitro cytotoxic effect of TMBP on lung-cancer cell-line NCI-H460 and reports mechanisms on immunomodulation and cell death. TMBP treatment (12.5-200 µM) inhibited cell proliferation at 24, 48, and 72 h. After 24-h treatment, TMBP at IC50 (154 µM) induced various morphological and ultrastructural changes in NCI-H460, reduced migration and immunofluorescence staining of N-cadherin and ß-catenin, induced increased reactive oxygen species and nitric oxide with reduced superoxide radical-anion, increased superoxide dismutase activity and reduced glutathione reductase. Treatment also caused metabolic stress, reduced glucose-uptake, intracellular lactate dehydrogenase and lactate levels, mitochondrial depolarization, increased lipid droplets, and autophagic vacuoles. TMBP induced cell-cycle arrest in the G2/M phase, death by apoptosis, increased caspase-3/7, and reduced STAT-3 immunofluorescence staining. The anticancer effect was accompanied by decreasing PI3K, AKT, ARG-1, and NF-κB levels, and increasing iNOS. These results suggest its potential as a candidate for use in future lung anticancer drug design studies.


Assuntos
Antineoplásicos , Neoplasias Pulmonares , Feminino , Humanos , Animais , Camundongos , Ovinos , Neoplasias Pulmonares/patologia , NF-kappa B/metabolismo , Proteínas Proto-Oncogênicas c-akt/metabolismo , Fosfatidilinositol 3-Quinases/metabolismo , Linhagem Celular Tumoral , Apoptose , Antineoplásicos/farmacologia , Antineoplásicos/uso terapêutico , Proliferação de Células , Estresse Oxidativo , Estresse Fisiológico
20.
Biochim Biophys Acta Mol Basis Dis ; 1870(4): 167078, 2024 04.
Artigo em Inglês | MEDLINE | ID: mdl-38364941

RESUMO

Leishmaniasis is a group of infectious diseases caused by protozoa of the Leishmania genus and its immunopathogenesis results from an unbalanced immune response during the infection. Diabetes is a chronic disease resulting from dysfunction of the body's production of insulin or the ability to use it properly, leading to hyperglycemia causing tissue damage and impairing the immune system. AIMS: The objective of this work was to evaluate the effects of hyperglycemia and diabetes during Leishmania amazonensis infection and how these conditions alter the immune response to the parasite. METHODS: An in vitro hyperglycemic stimulus model using THP-1-derived macrophages and an in vivo experimental diabetes with streptozotocin (STZ) in C57BL/6 mice was employed to investigate the impact of diabetes and hyperglicemia in Leishmania amazonensis infection. RESULTS: We observed that hyperglycemia impair the leishmanicidal capacity of macrophages derived from THP-1 cells and reverse the resistance profile that C57BL/6 mice have against infection by L. amazonensis, inducing more exacerbated lesions compared to non-diabetic animals. In addition, the hyperglycemic stimulus favored the increase of markers related to the phenotype of M2 macrophages. The induction of experimental diabetes in C57BL/6 mice resulted in a failure in the production of nitric oxide (NO) in the face of infection and macrophages from diabetic animals failed to process and present Leishmania antigens, being unable to activate and induce proliferation of antigen-specific lymphocytes. CONCLUSION: Together, these data demonstrate that diabetes and hyperglycemia can impair the cellular immune response, mainly of macrophages, against infection by parasites of the genus Leishmania.


Assuntos
Diabetes Mellitus , Hiperglicemia , Leishmania , Leishmaniose , Animais , Camundongos , Camundongos Endogâmicos C57BL , Leishmaniose/complicações , Leishmaniose/parasitologia , Leishmania/fisiologia , Macrófagos , Hiperglicemia/complicações , Imunidade
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA