Performance Assessment of ELISA Using the Specific Antigen Tc323 for the Diagnosis of Chronic Chagas Disease.

In the chronic phase of Chagas disease (CCD), diagnosis relies on detecting specific IgG antibodies due to the low or absent presence of the parasite in human blood. However, the performance of current serological tests is highly variable, lacking a "" assay with 100% sensitivity and specificity, which challenges the exploration of new biomarkers. In the present study, we evaluated the diagnostic accuracy of an optimized ELISA using the predicted immunogenic domains (called TcD3 and TcD6) of Tc323, a protein highly conserved among strains but absent in other clinically significant parasites such as .

[Consensus on therapeutic effort limitation, with a palliative care approach].

The National Committee for Palliative Care expressed their commitment to approach the decision of foregoing life sustaining treatment from a palliative care perspective, allowing the implementation of a care program to prevent therapeutic obstinacy, respect the dignity of the patient and their parents, and evaluate a rational, reasonable and adequate use of health and technological resources by focusing on the quality of life of the child, in order to realize their best interest, providing a guide that facilitates the decision-making process in dilemmatic situations in pediatrics.

Alamandine, a protective component of the renin-angiotensin system, reduces cellular proliferation and interleukin-6 secretion in human macrophages through MasR-MrgDR heteromerization.

Alamandine (ALA) exerts protective effects similar to angiotensin (Ang) (1-7) through Mas-related G protein-coupled receptor type D receptor (MrgDR) activation, distinct from Mas receptor (MasR). ALA induces anti-inflammatory effects in mice but its impact in human macrophages remains unclear. We aimed to investigate the anti-inflammatory effects of ALA in human macrophages.

Tumor-Intrinsic Activity of Chromobox 2 Remodels the Tumor Microenvironment in High-grade Serous Carcinoma.

Unlabelled: Chromobox 2 (CBX2), an epigenetic reader and component of polycomb repressor complex 1, is highly expressed in >75% of high-grade serous carcinoma. Increased CBX2 expression is associated with poorer survival, whereas CBX2 knockdown leads to improved chemotherapy sensitivity. In a high-grade serous carcinoma immune-competent murine model, knockdown of CBX2 decreased tumor progression.

Characterization of Novel -Specific Antigen with Potential Use in the Diagnosis of Chagas Disease.

Chagas disease is caused by the parasite . In humans, it evolves into a chronic disease, eventually resulting in cardiac, digestive, and/or neurological disorders. In the present study, we characterized a novel antigen named Tc323 (TcCLB.

The programmed death ligand 1 interactome demonstrates bidirectional signaling coordinating immune suppression and cancer progression in head and neck squamous cell carcinoma.

Background: The programmed cell death protein 1 (PD-1) and programmed death ligand 1 (PD-L1) are validated cancer targets; however, emerging mechanisms and impact of PD-L1 intracellular signaling on cancer behavior are poorly understood.

Methods: We investigated the cancer cell intrinsic role of PD-L1 in multiple patient-derived models in vitro and in vivo. PD-L1 overexpression, knockdown, and PD-L1 intracellular domain (PD-L1-ICD) deletion (Δ260-290PD-L1) models were assessed for key cancer properties: clonogenicity, motility, invasion, and immune evasion.

Endogenous Retrovirus RNA Expression Differences between Race, Stage and HPV Status Offer Improved Prognostication among Women with Cervical Cancer.

Endogenous human retroviruses (ERVs) are remnants of exogenous retroviruses that have integrated into the human genome. Using publicly available RNA-seq data from 63 cervical cancer patients, we investigated the expression of ERVs in cervical cancers. Four aspects of cervical cancer were investigated: patient ancestral background, tumor HPV type, tumor stage and patient survival.

Expression of Inhibitory Receptors TIGIT, TIM-3, and LAG-3 on CD4+ T Cells from Patients with Different Clinical Forms of Chronic Chagas Disease.

T cells are central to the adaptive immune response against Trypanosoma cruzi infection. In chronic Chagas disease (CCD), circulating parasite-specific memory T cells show reduced functionality and increased expression of inhibitory receptors as a result of persistent antigenic stimulation. This phenotype has been linked to progression of cardiac pathology, whereas the presence of polyfunctional T cells shows association with therapeutic success.

Activation-induced marker assays for identification of Trypanosoma cruzi-specific CD4 or CD8 T cells in chronic Chagas disease patients.

Antigen-specific T cells are central to the adaptive immune response against T. cruzi infection and underpin the efficacy of on-going vaccine strategies. In this context, the present study focuses on T-cell assays that define the parasite-specificity on the basis of upregulation of TCR stimulation-induced surface markers.

[Use of Multiple Methods to Measure Adherence to Antiretroviral Treatment in La Romana, Dominican RepublicMedição da adesão a antirretrovirais com múltiplos métodos em La Romana, República Dominicana].

Objective: To develop a tool that measures levels of adherence to antiretroviral treatment (ART) in resource-poor settings, based on a combination of four methods for measuring adherence.

Methods: Retrospective review of 500 medical records of people living with HIV, randomly selected from October 2017 to January 2020. Adherence to ART was measured by combining four measurement methods (coverage of prescribed ART, ART picked up at pharmacies, viral load, and self-reported adherence).

Treatment of benign tumours and related pathologies with radiotherapy: experience of the General Hospital of Mexico.

Background: Benign diseases include tumours or localized growths with low potential for progression. The use of radiotherapy (RT) at a low dose (LD) or intermediate dose for benign pathologies has been widely proposed and studied. Currently, the use of RT is limited mainly to hyperproliferative and inflammatory diseases as a first or second line of treatment.

Immunization With Lipopolysaccharide-Activated Dendritic Cells Generates a Specific CD8 T Cell Response That Confers Partial Protection Against Infection With .

Lipopolysaccharide (LPS) induces the activation of dendritic cells (DCs) throughout the engagement of toll-like receptor 4. LPS-activated DCs show increased capacity to process and present pathogen-derived antigens to activate naïve T cells. DCs-based vaccines have been successfully used to treat some cancer types, and lately transferred to the field of infectious diseases, in particular against HIV.

The Kinetoplastid-Specific Protein TcCAL1 Plays Different Roles During Differentiation and Host-Cell Invasion in .

In the pathogen , the calcium ion (Ca) regulates key processes for parasite survival. However, the mechanisms decoding Ca signals are not fully identified or understood. Here, we investigate the role of a hypothetical Ca-binding protein named TcCAL1 in the life cycle of .

Galectins in Chagas Disease: A Missing Link Between Infection, Inflammation, and Tissue Damage.

, the protozoan parasite causative agent of Chagas disease, affects about seven million people worldwide, representing a major global public health concern with relevant socioeconomic consequences, particularly in developing countries. In this review, we discuss the multiple roles of galectins, a family of β-galactoside-binding proteins, in modulating both infection and immunoregulation. Specifically, we focus on galectin-driven circuits that link parasite invasion and inflammation and reprogram innate and adaptive immune responses.

Optimization and Preliminary Physicochemical Characterization of Pectin Extraction from Watermelon Rind () with Citric Acid.

Watermelon rind was used for the pectin extraction with citric acid as the extractant solvent. The effects of pH (2.0-3.

A Single Dose of a Hybrid hAdV5-Based Anti-COVID-19 Vaccine Induces a Long-Lasting Immune Response and Broad Coverage against VOC.

Most approved vaccines against COVID-19 have to be administered in a prime/boost regimen. We engineered a novel vaccine based on a chimeric human adenovirus 5 (hAdV5) vector. The vaccine (named CoroVaxG.

differentiation of epimastigotes into metacyclic trypomastigotes using a biphasic medium.

The pathogen differentiates from epimastigotes (E) into infective metacyclic trypomastigotes (MTs) to invade the mammalian cell. This process, called metacyclogenesis, is mimicked in vitro by nutrient starvation or incubation with minimal media. Here, we describe an alternative protocol for metacyclogenesis by incubating E forms in a biphasic medium supplemented with human blood.

Induces Regulatory B Cell Alterations in Patients With Chronic Chagas Disease.

The clinical evolution of patients with chronic Chagas disease (CCD) is mainly associated with an excessive inflammation and a defective immunomodulatory profile caused by the interaction between and the host. Regulatory B (Breg) cells exert immune suppression mostly through IL-10 production (B10 cells), but also through IL-10-independent mechanisms. Previously, we demonstrated that CCD patients with cardiomyopathy show changes in the Breg cell phenotypic distribution although maintain IL-10 production capacity.

T Cell Specificity: A Great Challenge in Chagas Disease.

The CD4 and CD8 T cell immune response against , the parasite causing Chagas disease, are relevant for both parasite control and disease pathogenesis. Several studies have been focused on their phenotype and functionally, but only a few have drilled down to identify the parasite proteins that are processed and presented to these cells, especially to CD4 T lymphocytes. Although approximately 10,000 proteins are encoded per haploid genome, fewer than 200 T cell epitopes from 49 proteins have been identified so far.

Ex vivo characterization of Breg cells in patients with chronic Chagas disease.

Despite the growing importance of the regulatory function of B cells in many infectious diseases, their immunosuppressive role remains elusive in chronic Chagas disease (CCD). Here, we studied the proportion of different B cell subsets and their capacity to secrete IL-10 ex vivo in peripheral blood from patients with or without CCD cardiomyopathy. First, we immunophenotyped peripheral blood mononuclear cells from patients according to the expression of markers CD19, CD24, CD38 and CD27 and we showed an expansion of total B cell and transitional CD24CD38 B cell subsets in CCD patients with cardiac involvement compared to non-infected donors.

Interaction Between the Angiotensin-(1-7) Mas Receptor and the Dopamine D2 Receptor: Implications in Inflammation.

[Figure: see text].

Recombinant antibody against Trypanosoma cruzi from patients with chronic Chagas heart disease recognizes mammalian nervous system.

Background: To deeply understand the role of antibodies in the context of Trypanosoma cruzi infection, we decided to characterize A2R1, a parasite antibody selected from single-chain variable fragment (scFv) phage display libraries constructed from B cells of chronic Chagas heart disease patients.

Methods: Immunoblot, ELISA, cytometry, immunofluorescence and immunohistochemical assays were used to characterize A2R1 reactivity. To identify the antibody target, we performed an immunoprecipitation and two-dimensional electrophoresis coupled to mass spectrometry and confirmed A2R1 specific interaction by producing the antigen in different expression systems.

The cytosolic tryparedoxin peroxidase from Trypanosoma cruzi induces a pro-inflammatory Th1 immune response in a peroxidatic cysteine-dependent manner.

Trypanosoma cruzi cytosolic tryparedoxin peroxidase (c-TXNPx) is a 2-Cys peroxiredoxin (Prx) with an important role in detoxifying host cell oxidative molecules during parasite infection. c-TXNPx is a virulence factor, as its overexpression enhances parasite infectivity and resistance to exogenous oxidation. As Prxs from other organisms possess immunomodulatory properties, we studied the effects of c-TXNPx in the immune response and analysed whether the presence of the peroxidatic cysteine is necessary to mediate these properties.

Spanish Adaptation of the Pediatric Memorial Symptom Assessment Scale for Children, Teens, and Caregivers.

Context: There are no validated Spanish tools to assess symptom burden in pediatric cancer. The Pediatric Memorial Symptom Assessment Scale (Pediatric-MSAS) is an English valid multidimensional and comprehensive instrument.

Objectives: To validate Pediatric-MSAS-Spanish (MSAS-Child, MSAS-Teen, and MSAS-Caregiver versions) in patients with cancer treated in two public hospitals in Buenos Aires, Argentina.