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1.
Blood Coagul Fibrinolysis ; 34(1): 70-74, 2023 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-35946469

RESUMEN

Venous thromboembolism (VTE) is an important cause of morbidity/mortality in cancer patients, and COMPASS-CAT score must be used to VTE-risk prediction. There is a relationship between cytokines and thrombus formation and/or resolution. This study aimed to investigate the VTE risk and cytokines level in breast cancer patients prior to chemotherapy with doxorubicin (DOXO). Eighty women with breast cancer and indication for DOXO treatment were selected. TNF, IL-1ß, IL-6, and IL-10 were measured after the diagnosis and immediately before DOXO treatment. All 80 patients presented a high risk for VTE when evaluated by COMPASS-CAT model (score ≥7). A positive correlation was observed between IL-10 plasma levels and VTE risk score. Our data showed that higher IL-10 levels before chemotherapy are associated to increased risk of VTE in breast cancer patients. This finding suggests that IL-10 levels and the combination with COMPASS-CAT score could be good markers to predict increased risk of VTE in these patients.


Asunto(s)
Neoplasias de la Mama , Interleucina-10 , Tromboembolia Venosa , Femenino , Humanos , Doxorrubicina/efectos adversos , Interleucina-10/sangre , Interleucina-10/química , Factores de Riesgo , Trombosis/etiología , Tromboembolia Venosa/etiología , Neoplasias de la Mama/complicaciones , Neoplasias de la Mama/tratamiento farmacológico
2.
Angiogenesis ; 26(1): 129-166, 2023 02.
Artículo en Inglés | MEDLINE | ID: mdl-36183032

RESUMEN

Cancer cells are embedded within the tissue and interact dynamically with its components during cancer progression. Understanding the contribution of cellular components within the tumor microenvironment is crucial for the success of therapeutic applications. Here, we reveal the presence of perivascular GFAP+/Plp1+ cells within the tumor microenvironment. Using in vivo inducible Cre/loxP mediated systems, we demonstrated that these cells derive from tissue-resident Schwann cells. Genetic ablation of endogenous Schwann cells slowed down tumor growth and angiogenesis. Schwann cell-specific depletion also induced a boost in the immune surveillance by increasing tumor-infiltrating anti-tumor lymphocytes, while reducing immune-suppressor cells. In humans, a retrospective in silico analysis of tumor biopsies revealed that increased expression of Schwann cell-related genes within melanoma was associated with improved survival. Collectively, our study suggests that Schwann cells regulate tumor progression, indicating that manipulation of Schwann cells may provide a valuable tool to improve cancer patients' outcomes.


Asunto(s)
Neoplasias , Neuroglía , Humanos , Estudios Retrospectivos , Neuroglía/metabolismo , Células de Schwann/metabolismo , Células de Schwann/patología , Pericitos , Microambiente Tumoral/fisiología , Neoplasias/patología
3.
J Surg Oncol ; 126(1): 139-143, 2022 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-35689573

RESUMEN

BACKGROUND AND OBJECTIVES: Previous studies demonstrated an association between OX40+T cell expression with poor prognosis in gastric cancer (GC). The soluble form of OX40 (sOX40) could block the interactions between OX40 on the effector T cell, and it is a ligand (OX40L) in dendritic cells. However, the role of sOX40 as a pretreating biomarker and prognostic predictor remains unclear. This study aimed to evaluate the association of levels of sOX40 and sOX40L with disease progression in GC. METHODS: Between 2017 and 2018, a cross-sectional study was performed on 83 GC patients and 20 healthy controls. RESULTS: Among 83 GC patients (median of 63 years), 32.4% of patients with I/II stages, 42.3% III, and 25.3% in IV stages. Metastatic GC patients had significantly higher levels of soluble OX40 compared with stage III (p = 0.0003) and early stages I and II patients (p = 0.005). There was no significant differences in the sOX40 and sOX40L levels between Lauren's histological subtype (intestinal, diffuse, and mixed). CONCLUSIONS: This study showed that soluble OX40 levels have an essential role in GC progression. OX40 molecules may constitute a predictor for poor prognosis and a potential target for immunotherapy in GC.


Asunto(s)
Neoplasias Gástricas , Biomarcadores/metabolismo , Estudios Transversales , Humanos , Neoplasias Gástricas/metabolismo , Linfocitos T/metabolismo
4.
J Surg Oncol ; 126(1): 20-27, 2022 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-35689578

RESUMEN

BACKGROUND: Risk-reducing operations are an important part of the management of hereditary predisposition to cancer. In selected cases, they can considerably reduce the morbidity and mortality associated with cancer in this population. OBJECTIVES: The Brazilian Society of Surgical Oncology (BSSO) developed this guideline to establish national benchmarks for cancer risk-reducing operations. METHODS: The guideline was prepared from May to December 2021 by a multidisciplinary team of experts to discuss the surgical management of cancer predisposition syndromes. Eleven questions were defined and assigned to expert groups that reviewed the literature and drafted preliminary recommendations. Following a review by the coordinators and a second review by all participants, the groups made final adjustments, classified the level of evidence, and voted on the recommendations. RESULTS: For all questions including risk-reducing colectomy, gastrectomy, and thyroidectomy, a major agreement was achieved by the participants, always using accessible alternatives. CONCLUSION: This and its accompanying article represent the first guideline in cancer risk reduction surgery developed by the BSSO and it should serve as an important reference for the management of families with cancer predisposition.


Asunto(s)
Neoplasias , Oncología Quirúrgica , Brasil/epidemiología , Humanos , Glándula Tiroides
5.
J Surg Oncol ; 126(1): 144-149, 2022 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-35689579

RESUMEN

BACKGROUND AND OBJECTIVES: T cells are central in antitumor immunity in gastric cancer (GC). The inducible costimulatory molecule (ICOS) is a T cell receptor that primarily transmits positive signals for T cell activation and is associated with poor prognosis in GC. In contrast, the costimulatory molecule programmed death 1 (PD-1) is an inhibitory receptor related to tumor immune escape. This study aimed to analyze soluble sites and sPD-1 levels in GC. METHODS: This study enrolled 83 GC patients and 20 healthy controls. RESULTS: The median survival time was 23.22 months in the GC patients. Low levels of sPD-1 and sICOS in GC patients compared to the control group (p = 0.003; p < 0.0001, respectively). High sPD-1 levels in stage IV patients compared to I/II and III stages groups (p = 0.008 and p = 0.0004, respectively). GC patients with stages I and II had higher levels of sICOS compared to III and IV stages (p = 0.0005 and p = 0.02, respectively). There were no significant differences in sPD-1 and sICOS levels between Lauren subtypes. CONCLUSION: These results suggest a predominance of inhibitory costimulatory signals in advanced stages of GC, facilitating tumor immune escape, as the opposite occurs in early stages, resulting in an effective antitumor T-cell-mediated immune response.


Asunto(s)
Neoplasias Gástricas , Antígeno B7-H1/metabolismo , Humanos , Neoplasias Gástricas/patología
6.
J Surg Oncol ; 126(1): 125-131, 2022 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-35689589

RESUMEN

BACKGROUND AND OBJECTIVES: Gastric cancer (GC) remains responsible for over one million new cases in 2020. Activated platelets express the CD40 ligand (CD40L) and CD62P in the cytoplasmic membrane, and interaction with the vascular endothelium can induce the production of tumor growth factors and metastases. We aimed to characterize the soluble levels of sCD40L and sCD62P in GC patients. METHODS: A cross-sectional study was performed on 83 GC patients and 20 healthy controls. RESULTS: High levels of sCD40L were obtained in GC patients compared to healthy controls (p = 0.003) and in the I/II compared with III and IV stages (p < 0.0001 and p = 0.007, respectively). Low levels of sCD62P in the GC patients compared to healthy controls (p = 0.009). High soluble levels of sCD62P in I/II compared with III and IV stages (p = 0.002 and p = 0.01, respectively). There are no significant differences in the levels of sCD40L and sCD62P were observed between intestinal, diffuse, and mixed types. CONCLUSIONS: We concluded that sCD40L and sCD62P molecules may be predictive biomarkers since the increase in plasma levels was associated with disease progression and metastasis in GC. In addition, the serum sCD40L and sCD62P can potentially be used as an indicator of response to anticancer therapy.


Asunto(s)
Neoplasias Gástricas , Biomarcadores/metabolismo , Plaquetas/metabolismo , Ligando de CD40 , Carcinogénesis , Transformación Celular Neoplásica/metabolismo , Estudios Transversales , Humanos , Activación Plaquetaria , Neoplasias Gástricas/metabolismo
7.
Int J Biol Macromol ; 210: 530-544, 2022 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-35513094

RESUMEN

Among the most lethal forms of cancer, malignant brain tumors persist as one of the greatest challenges faced by oncologists, where nanotechnology-driven theranostics can play a critical role in developing novel polymer-based supramolecular nanoarchitectures with multifunctional and multi-modal characteristics to fight cancer. However, it is virtually a consensus that, besides the complexity of active delivering anticancer drugs by the nanocarriers to the tumor site, the current evaluation methods primarily relying on in vitro assays and in vivo animal models have been accounted for the low translational effectiveness to clinical applications. In this view, the chick chorioallantoic membrane (CAM) assay has been increasingly recognized as one of the best preclinical models to study the effects of anticancer drugs on the tumor microenvironment (TME). Thus, in this study, we designed, characterized, and developed novel hybrid nanostructures encompassing chemically functionalized carboxymethylcellulose (CMC) with mitochondria-targeting pro-apoptotic peptide (KLA) and cell-penetrating moiety (cysteine, CYS) with fluorescent inorganic semiconductor (Ag-In-S, AIS) for simultaneously bioimaging and inducing glioblastoma cancer cell (U-87 MG, GBM) death. The results demonstrated that the CMC-peptide macromolecules produced supramolecular vesicle-like nanostructures with aqueous colloidal stability suitable as nanocarriers for passive and active targeting of cancer tumors. The optical properties and physicochemical features of the nanoconjugates confirmed their suitability as photoluminescent nanoprobes for cell bioimaging and intracellular tracking. Moreover, the results in vitro demonstrated a notable killing activity towards GBM cells of cysteine-bearing CMC conjugates coupled with pro-apoptotic KLA peptides. More importantly, compared to doxorubicin (DOX), a model anticancer drug in chemotherapy that is highly toxic, these innovative nanohybrids nanoconjugates displayed higher lethality against U-87 MG cancer cells. In vivo CAM assays validated these findings where the nanohybrids demonstrated a significant reduction of GBM tumor progression (41% area) and evidenced an antiangiogenic activity. These results pave the way for developing polymer-based hybrid nanoarchitectonics applied as targeted multifunctional theranostics for simultaneous imaging and therapy against glioblastoma while possibly reducing the systemic toxicity and side-effects of conventional anticancer chemotherapeutic agents.


Asunto(s)
Antineoplásicos , Neoplasias Encefálicas , Glioblastoma , Puntos Cuánticos , Animales , Antineoplásicos/química , Neoplasias Encefálicas/tratamiento farmacológico , Carboximetilcelulosa de Sodio/química , Línea Celular Tumoral , Cisteína , Doxorrubicina/química , Glioblastoma/tratamiento farmacológico , Nanoconjugados/uso terapéutico , Polímeros/uso terapéutico , Puntos Cuánticos/química , Nanomedicina Teranóstica , Microambiente Tumoral
9.
Am J Dent ; 34(5): 281-285, 2021 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-34689453

RESUMEN

PURPOSE: To evaluate the bleaching sensitivity and the bleaching effectiveness of in-office bleaching, following a protocol of complete cervical third protection with gingival dam in comparison with a traditional manner of applying gingival dam (used only in the gingival sulcus area). METHODS: 35 participants were selected for this double-blind split-mouth randomized clinical trial. The control group received the gingival barrier in the traditional manner, and in the experimental group the barrier was extended by about 3 mm to include the cervical region. The bleaching agent was applied in two sessions. The risk and intensity of bleaching sensitivity were assessed using two scales. The bleaching effectiveness was evaluated with a digital spectrophotometer with the tip placed in the cervical area. The absolute risk of bleaching sensitivity was compared by the McNemar's test and bleaching effectiveness (ΔEab, ΔE00 and ΔWi) and intensity of bleaching sensitivity was evaluated by Wilcoxon-paired test (α= 0.05). RESULTS: No significant difference at risk (P= 1.0) and intensity of bleaching sensitivity (P> 0.45) was seen between groups. After 30 days, bleaching effectiveness had no statistical difference between the groups (P> 0.09). CLINICAL SIGNIFICANCE: Extending the barrier in the cervical region of teeth did not reduce the risk and intensity of bleaching sensitivity, nor jeopardize the bleaching effectiveness.


Asunto(s)
Sensibilidad de la Dentina , Blanqueadores Dentales , Blanqueamiento de Dientes , Sensibilidad de la Dentina/prevención & control , Humanos , Peróxido de Hidrógeno , Boca , Ensayos Clínicos Controlados Aleatorios como Asunto , Blanqueamiento de Dientes/efectos adversos , Blanqueadores Dentales/efectos adversos , Resultado del Tratamiento
10.
Artículo en Inglés | MEDLINE | ID: mdl-32760596

RESUMEN

The authors developed a retinoblastoma model using fresh harvested cells from an enucleated eye that were transplanted in chick embryos (chorioallantoic membrane model). The transplanted embryos were treated with escalating doses of Melphalan. This exploratory model was developed with the goal of testing drug sensitivity. Our findings suggest this tumor model could be employed to personalize treatment for patients with retinoblastoma, especially those with bilateral and more refractory disease.

11.
J Surg Oncol ; 121(5): 901-905, 2020 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-31858621

RESUMEN

BACKGROUND AND OBJECTIVES: The prognosis of colorectal cancer (CRC) has improved in the last decades, however, a lower overall survival persists in the elderly. The understanding of immunity changes in the elderly with CRC will allow the emergence of new treatments with higher response rates. 4-1BB and CD40L, an immune checkpoint stimulator, play an important role in T-cell responses and platelets. Our aim was to characterize the soluble levels of CD40L and 4-1BB in CRC elderly patients. METHODS: A cross-sectional study was performed in 41 patients with CRC and 35 healthy elderly controls. Patients with CRC were divided into three groups according to staging: 13 patients with advanced tumor restricted to the organ (stages II); 16 patients with lymph node metastasis (stage III); and 12 patients with distant metastasis (stage IV). RESULTS: There were higher levels of soluble s4-1BB and sCD40L in CRC elderly stage II patients when compared with healthy controls (P = .0009 and P < .0001, respectively), stage III patients (P = .008 and P < .0001, respectively) and stage IV patients (P = .007 and P < .0001, respectively). CONCLUSIONS: We concluded that sCD40L and s4-1BB molecules may be prognostic biomarkers, since the reduction in plasma levels of these molecules was associated with disease progression.


Asunto(s)
Ligando de CD40/sangre , Neoplasias Colorrectales/mortalidad , Miembro 9 de la Superfamilia de Receptores de Factores de Necrosis Tumoral/sangre , Anciano , Biomarcadores de Tumor/sangre , Estudios de Casos y Controles , Neoplasias Colorrectales/sangre , Neoplasias Colorrectales/patología , Estudios Transversales , Femenino , Humanos , Metástasis Linfática , Masculino , Metástasis de la Neoplasia
12.
Curr Top Med Chem ; 18(17): 1475-1482, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30345921

RESUMEN

BACKGROUND: A series of symmetrical 1,4-disubstituted bis-1,2,3-triazoles was prepared by double copper catalyzed Azide-alkyne Cycloaddition (CuAAC) from aliphatic bis-azides and a tetraethylene glycol bis-azide derivative. The eighteen novel compounds were evaluated in vitro for their cytotoxic activity against two human tumor cell lines: Human breast adenocarcinoma (MDA-MB 231) and ovarian adenocarcinoma (TOV-21G). RESULTS AND CONCLUSION: The results of colorimetric MTT assays showed that compounds 4j and 4q exhibited a better selectivity index and cell viability comparable with the standard drug doxorubicin. These compounds induced apoptosis in both tested cell lines, as assessed by BrdU assay. The results suggest that these structurally simple compounds may be promising prototypes for antitumoral agents.


Asunto(s)
Alquinos/química , Antineoplásicos Fitogénicos/farmacología , Azidas/química , Cobre/química , Triazoles/farmacología , Antineoplásicos Fitogénicos/síntesis química , Antineoplásicos Fitogénicos/química , Catálisis , Proliferación Celular/efectos de los fármacos , Supervivencia Celular/efectos de los fármacos , Reacción de Cicloadición , Relación Dosis-Respuesta a Droga , Ensayos de Selección de Medicamentos Antitumorales , Humanos , Estructura Molecular , Relación Estructura-Actividad , Triazoles/síntesis química , Triazoles/química , Células Tumorales Cultivadas
13.
Biopreserv Biobank ; 16(4): 258-269, 2018 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-29957024

RESUMEN

AIM: The present study evaluates the effect of different concentrations of antioxidants (catalase - CAT and alpha lipoic acid - ALA) on the follicular activation and morphology, DNA damage, ROS production, and mitochondrial activity in vitrified sheep ovarian tissue. METHODS: This experiment was divided into two steps. First, ovarian fragments were distributed into the following treatments: fresh tissue or control (CTR), incubation (INC), vitrification without antioxidant (VWA), with CAT (10, 20, or 40 IU mL-1) or ALA (25, 50, or 100 µM mL-1). After vitrification/warming, the fragments were additionally incubated for 24 hours and evaluated for morphology and follicular activation, as well as reactive oxygen species (ROS) levels in the culture medium. For the second step, other ovarian fragments were submitted to CTR, VWA, CAT40, and ALA100. After vitrification/warming, the fragments were incubated for 24 hours and evaluated by cell density of ovarian stroma, DNA damage, and mitochondrial and intracellular ROS levels. RESULTS: The percentage of morphologically normal follicles in vitrified ovarian tissue in the presence of ALA in all concentrations did not differ (p > 0.05) from fresh tissue or CTRs. The percentage of activated follicles was higher in ALA100 µM mL-1 than those observed for the treatments INC, CAT (40 IU mL-1), or ALA (25 or 50 µM mL-1). The use of CAT affected (p < 0.05) the density of stromal cells (40 IU mL-1), ROS levels (10 and 20 IU mL-1), as well as DNA damage revealed by ©H2AX (40 IU mL-1). CONCLUSIONS: Although 100 µM/mL of ALA did not alter intracellular ROS, this concentration reduced the levels of ROS in the culture medium, preserved both the follicular morphology, as well as the mitochondrial activity, promoted follicle activation, and protected the follicles from DNA damage.


Asunto(s)
Catalasa/farmacología , Criopreservación/métodos , Ovario/citología , Ovario/metabolismo , Ácido Tióctico/farmacología , Vitrificación , Animales , Daño del ADN/efectos de los fármacos , Daño del ADN/genética , Femenino , Folículo Ovárico/citología , Folículo Ovárico/efectos de los fármacos , Folículo Ovárico/metabolismo , Ovario/efectos de los fármacos , Especies Reactivas de Oxígeno/metabolismo , Ovinos
14.
Cytotechnology ; 69(4): 699-710, 2017 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-28321777

RESUMEN

Digoxin is a drug widely used to treat heart failure and studies have demonstrated its potential as anticancer agent. In addition, digoxin presents the potential to interact with a series of other compounds used in medicine. The aim of the present study was to evaluate in vitro the cytotoxicity, genotoxicity and mutagenicity of digoxin and its potential to interact with the mutagen Mitomycin C (MMC). The cytotoxicity of digoxin was assessed by employing the MTT method and the comet assay was performed to assess the genotoxicity of this medicine in CHO-K1 and HeLa cell lines. Besides, the cytokinesis-block micronucleus assay was performed to assess the mutagenicity and the antimutagenicity of this drug. The Ames assay was also performed with TA98 and TA100 strains of S. typhimurium. Results showed that digoxin was cytotoxic, genotoxic and mutagenic for HeLa and CHO-K1 cell lines at concentrations many times higher than those observed in human therapeutic conditions. Nevertheless, an antimutagenic effect against the mutagen MMC was observed on both cell lines in concentrations near those used therapeutically in humans. This chemoprotective effect observed is an interesting finding that should be better explored regarding its impact in anticancer chemotherapy.

15.
Stud Health Technol Inform ; 217: 1003-8, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-26294601

RESUMEN

This study aimed to report on the design and development of a low cost Reverse Walker through a participative development cycle with people undergoing rehabilitation. The creation and fundamentals of the concept are described, as well as the development of prototypes and their provision to subjects with mobility problems. The Reverse Walker benefits the user by promoting a more upright posture and favoring the development of postural balance. Enhancing the mobility of people with disabilities may benefit their independence, social participation and quality of life.


Asunto(s)
Personas con Discapacidad/rehabilitación , Diseño de Equipo/economía , Dispositivos de Autoayuda/economía , Andadores/economía , Anciano , Niño , Ahorro de Costo , Femenino , Humanos , Masculino , Equilibrio Postural , Prueba de Estudio Conceptual
16.
Bioorg Med Chem ; 23(15): 4397-4404, 2015 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-26122772

RESUMEN

Cardiotonic steroids (CS), natural compounds with traditional use in cardiology, have been recently suggested to exert potent anticancer effects. However, the repertoire of molecules with Na,K-ATPase activity and anticancer properties is limited. This paper describes the synthesis of 6 new digoxin derivatives substituted (on the C17-butenolide) with γ-benzylidene group and their cytotoxic effect on human fibroblast (WI-26 VA4) and cancer (HeLa and RKO) cell lines as well as their effect on Na,K-ATPase activity and expression. As digoxin, compound BD-4 was almost 100-fold more potent than the other derivatives for cytotoxicity with the three types of cells used and was also the only one able to fully inhibit the Na,K-ATPase of HeLa cells after 24h treatment. No change in the Na,K-ATPase α1 isoform protein expression was detected. On the other hand it was 30-40 fold less potent for direct Na,K-ATPase inhibition, when compared to the most potent derivatives, BD-1 and BD-3, and digoxin. The data presented here demonstrated that the anticancer effect of digoxin derivatives substituted with γ-benzylidene were not related with their inhibition of Na,K-ATPase activity or alteration of its expression, suggesting that this classical molecular mechanism of CS is not involved in the cytotoxic effect of our derivatives.


Asunto(s)
Antineoplásicos/síntesis química , Compuestos de Bencilideno/química , Digoxina/análogos & derivados , ATPasa Intercambiadora de Sodio-Potasio/antagonistas & inhibidores , Animales , Antineoplásicos/química , Antineoplásicos/toxicidad , Sitios de Unión , Encéfalo/enzimología , Línea Celular , Supervivencia Celular/efectos de los fármacos , Digoxina/síntesis química , Digoxina/toxicidad , Células HeLa , Humanos , Riñón/enzimología , Simulación del Acoplamiento Molecular , Estructura Terciaria de Proteína , Ratas , ATPasa Intercambiadora de Sodio-Potasio/metabolismo
17.
ACS Med Chem Lett ; 6(3): 271-5, 2015 Mar 12.
Artículo en Inglés | MEDLINE | ID: mdl-25815145

RESUMEN

Antimicrobial peptides (AMPs) are currently being investigated as potential sources of novel therapeutics against an increasing number of microorganisms resistant to conventional antibiotics. The conjugation of an AMP to other bioactive compounds is an interesting approach for the development of new derivatives with increased antimicrobial efficiency and broader spectra of action. In this work, the synthesis of a new peptide-coumarin conjugate via copper(I)-catalyzed azide-alkyne cycloaddition is described. The conjugate was assayed for in vitro cytotoxicity and displayed antifungal activity against Cryptococcus gattii and Cryptococcus neoformans. Additionally, the conjugate exhibited increased antifungal efficacy when compared with the individual peptide, coumarin, or triazole moieties. Treatment of C. gattii with the peptide-coumarin conjugate enhanced the production of reactive oxygen species, suggesting that the oxidative burst plays an important role in the mechanism of action of the conjugate.

18.
Microb Pathog ; 78: 29-36, 2015 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-25450888

RESUMEN

Jorge Lobo's disease is a rare mycosis characterized by chronic inflammation, which causes skin lesions in the absence of visceral dissemination. The disease occurs mainly in hot and humid climates and most cases have been registered in the Brazilian Amazon region. This study investigated possible microvascular alterations in skin lesions caused by infection with Lacazia loboi which may interfere with the clinical progression of the disease. Immunohistochemistry was used to evaluate the density of blood and lymphatic vessels, as well as expression of the cell adhesion molecules ICAM-1, VCAM-1 and E-selectin. The results showed a reduced number of blood (62.66 ± 20.30 vessels/mm(2)) and lymphatic vessels (3.55 ± 5.84 vessels/mm(2)) in Jorge Lobo's disease when compared to control skin (169.66 ± 66.38 blood vessels/mm(2) and 8 ± 2.17 lymphatic vessels/mm(2)). There were a larger number of vessels expressing ICAM-1 (27.58 ± 15.32 vessels/mm(2)) and VCAM-1 (7.55 ± 6.2 vessels/mm(2)). No difference was observed in the expression of E-selectin (4.66 ± 11 vessels/mm(2)). Taken together, the results indicate changes in the local microvasculature which may interfere with the development of an efficient cell-mediated immune response and may explain restriction of the fungus to the site of injury.


Asunto(s)
Células Endoteliales/patología , Lacazia/fisiología , Lobomicosis/patología , Microvasos/patología , Piel/irrigación sanguínea , Adulto , Anciano , Anciano de 80 o más Años , Biomarcadores/metabolismo , Brasil , Selectina E/genética , Selectina E/metabolismo , Células Endoteliales/metabolismo , Femenino , Humanos , Inmunohistoquímica , Molécula 1 de Adhesión Intercelular/genética , Molécula 1 de Adhesión Intercelular/metabolismo , Lobomicosis/genética , Lobomicosis/metabolismo , Lobomicosis/microbiología , Masculino , Microvasos/metabolismo , Microvasos/microbiología , Persona de Mediana Edad , Piel/metabolismo , Piel/patología , Molécula 1 de Adhesión Celular Vascular/genética , Molécula 1 de Adhesión Celular Vascular/metabolismo , Adulto Joven
19.
PLoS One ; 9(10): e108776, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25290152

RESUMEN

Cardiotonic steroids are used to treat heart failure and arrhythmia and have promising anticancer effects. The prototypic cardiotonic steroid ouabain may also be a hormone that modulates epithelial cell adhesion. Cardiotonic steroids consist of a steroid nucleus and a lactone ring, and their biological effects depend on the binding to their receptor, Na,K-ATPase, through which, they inhibit Na+ and K+ ion transport and activate of several intracellular signaling pathways. In this study, we added a styrene group to the lactone ring of the cardiotonic steroid digoxin, to obtain 21-benzylidene digoxin (21-BD), and investigated the effects of this synthetic cardiotonic steroid in different cell models. Molecular modeling indicates that 21-BD binds to its target Na,K-ATPase with low affinity, adopting a different pharmacophoric conformation when bound to its receptor than digoxin. Accordingly, 21-DB, at relatively high µM amounts inhibits the activity of Na,K-ATPase α1, but not α2 and α3 isoforms. In addition, 21-BD targets other proteins outside the Na,K-ATPase, inhibiting the multidrug exporter Pdr5p. When used on whole cells at low µM concentrations, 21-BD produces several effects, including: 1) up-regulation of Na,K-ATPase expression and activity in HeLa and RKO cancer cells, which is not found for digoxin, 2) cell specific changes in cell viability, reducing it in HeLa and RKO cancer cells, but increasing it in normal epithelial MDCK cells, which is different from the response to digoxin, and 3) changes in cell-cell interaction, altering the molecular composition of tight junctions and elevating transepithelial electrical resistance of MDCK monolayers, an effect previously found for ouabain. These results indicate that modification of the lactone ring of digoxin provides new properties to the compound, and shows that the structural change introduced could be used for the design of cardiotonic steroid with novel functions.


Asunto(s)
Apoptosis/efectos de los fármacos , Digoxina/farmacología , Células Epiteliales/efectos de los fármacos , Células Epiteliales/metabolismo , ATPasa Intercambiadora de Sodio-Potasio/metabolismo , Uniones Estrechas/efectos de los fármacos , Animales , Cardenólidos/metabolismo , Cardenólidos/farmacología , Línea Celular Tumoral , Digoxina/análogos & derivados , Digoxina/química , Activación Enzimática/efectos de los fármacos , Humanos , Ratones , Modelos Moleculares , Conformación Molecular , Neoplasias/genética , Neoplasias/metabolismo , Ratas , ATPasa Intercambiadora de Sodio-Potasio/química , ATPasa Intercambiadora de Sodio-Potasio/genética
20.
Pesqui. vet. bras ; 32(7): 640-644, jul. 2012. graf
Artículo en Inglés | LILACS | ID: lil-644569

RESUMEN

Myeloma cells Sp2/0-Ag14 and spleen cells from BALB/c mouse immunized with sonicated Campylobacter fetus subsp. venerealis NCTC 10354 were fused with polyethylene glycol (PEG) for the selection of clones producing antibodies. Clones were obtained by limiting dilution and screened for the production of specific antibodies to C. fetus subsp. venerealis NCTC 10354 by indirect ELISA and western blot against a panel of bacteria: C. fetus subsp. venerealis NCTC 10354, C. fetus subsp fetus ADRI 1812, C. sputorum biovar sputorum LMG 6647, C. lari NCTC 11352, and Arcobacter skirrowii LMG 6621 for the ELISA and C. fetus subsp. venerealis NCTC 10354 and C. sputorum biovar sputorum LMG 6647 for the western blotting. Fifteen clones producing monoclonal antibodies (MAbs) anti-C. fetus subsp. venerealis of the IgM (1) and IgG (14) classes were further screened for species-specificity. Four clones of the 15 obtained were producers of species-specific monoclonal antibodies (MAbs): two were specific for C. fetus subsp. venerealis and two were specific for C. fetus subsp. fetus. None of the clones were reactive against C. sputorum biovar sputorum LMG 6647. All clones recognized a protein with molecular mass of approximately 148 kDa from lysed C. fetus subsp. venerealis NCTC 10354.


Para a produção de anticorpos monoclonais contra Campylobacter fetus subsp. venerealis foram utilizadas as linhagens de células de mieloma Sp2/0-Ag14 e células de baço de camundongos BALB/c imunizados com sonicado de C. fetus subsp. venerealis NCTC 10354. A detecção dos anticorpos monoclonais foi realizada por ELISA indireto utilizando antígeno sonicado de C. fetus subsp. venerealis NCTC 10354. A clonagem foi realizada por diluição limitante e os clones foram caracterizados por ELISA indireto utilizando um painel de bactérias escolhidas em função da prevalência e habitats: C. fetus subsp. venerealis NCTC 10354, C. fetus subsp. fetus ADRI 1812, C. sputorum biovar sputorum LMG 6647, C. lari NCTC 11352 e Arcobacter skirrowii LMG 6621; e no "western blotting" utilizando antígenos sonicados de C. fetus subsp. venerealis NCTC 10354 e C. sputorum biovar sputorum LMG 6647. Foram obtidos 15 clones produtores de anticorpos anti- C. fetus subsp. venerealis das classes IgM (1) e IgG (14). Quatro clones dentre os 15 clones obtidos foram produtores de anticorpos monoclonais espécie-específicos: dois clones reagiram com maior especificidade contra C. fetus subsp. venerealis NCTC 10354 e dois clones reagiram com maior especificidade contra C. fetus subsp. fetus ADRI 1812. Nenhum dos clones reagiu contra C. sputorum biovar sputorum LMG 6647, comprovando a especificidade dos anticorpos monoclonais testados. Todos os clones reconheceram uma proteína de massa molecular de aproximadamente 148 kDa no sonicado de C. fetus subsp. venerealis NCTC 10354.


Asunto(s)
Animales , Bovinos , Anticuerpos Monoclonales/aislamiento & purificación , Bovinos/microbiología , Campylobacter fetus/aislamiento & purificación , Formación de Anticuerpos/inmunología , Enfermedades de Transmisión Sexual/veterinaria , Ensayo de Inmunoadsorción Enzimática , Interacciones Huésped-Parásitos/inmunología
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