Track topics on Twitter Track topics that are important to you
Trypanosoma cruzi, the etiological agent of Chagas disease, has a highly efficient detoxification system to deal with the oxidative burst imposed by its host. One of the antioxidant enzymes involved is the cytosolic tryparedoxin peroxidase (c-TXNPx) which catalyzes the reduction of hydrogen peroxide, small-chain organic hydroperoxides and peroxynitrite. This enzyme is present in all parasite stages, and its over-expression renders parasites more resistant to oxidative defenses of macrophages, favoring parasite survival. This work addressed the study of the specific humoral and cellular immune response triggered by c-TXNPx in human natural infection. Thus, sera and peripheral blood mononuclear cells (PBMC) were collected from chronic asymptomatic and cardiac patients, and non-infected individuals. Results showed that levels of IgG antibodies against c-TXNPx were low in sera from individuals across all groups. B cell epitope prediction limited immunogenicity to a few and small regions on c-TXNPx sequence. At cellular level, PBMC from asymptomatic and cardiac patients proliferated and secreted Interferon-γ after c-TXNPx stimulation, compared to Mock control. However, only proliferation was higher in asymptomatic patients compared to cardiac and non-infected subjects. Furthermore, asymptomatic patients showed an enhanced frequency of CD19 CD69 cells upon exposure to c-TXNPx. Overall, our results show that c-TXNPx fails to induce a strong immune response in natural infection, being measurable only in those patients without any clinical symptoms. The little impact of c-TXNPx in human immune response could be strategic for parasite survival, as it keeps this crucial anti-oxidant enzyme activity safe from the mechanisms of adaptive immune response. This article is protected by copyright. All rights reserved.
This article was published in the following journal.
The recent development of novel Polymerase Chain Reaction (PCR) technologies that confer theoretical advantages over quantitative PCR has considerable potential in the diagnosis of low load infections...
Evidence suggests that natural and adaptive immune responses can trigger neuroendocrine responses. Here, we discuss changes in the activity of the hypothalamus-pituitary-adrenal axis and in autonomic ...
The detection of Trypanosoma cruzi in tissue samples is important in many situations, such as testing of the reactivation of the infection. The detection of T. cruzi nests in endomyocardial biopsies (...
Cardiomyopathy is the most serious consequence of Chagas disease, a neglected human disorder caused by Trypanosoma cruzi infection. Because T. cruzi parasites invade cardiomyocytes, we sought to inves...
The high fat diet (HFD) can trigger metabolic and cardiovascular diseases. Trypanosoma cruzi infection induces progressive inflammatory manifestations capable to affect the structure and the function ...
The investigators propose the evaluation of posaconazole and benznidazole in humans for the treatment of Chagas disease chronical infection. Exploratory trial of posaconazole antiparasitic...
Chagas disease is endemic to the Americas, infecting between 16-18 million individuals. In immigrant populations in the United States from endemic areas, it is estimated up to 4.9% may be...
The investigators are proposing to perform a double-blinded, non-inferiority randomized controlled trial comparing a short 30-day treatment with BZN 150mg/day (30d/150mg) vs. a 60-day trea...
This study was designed to develop a better understanding of the efficacy, safety/tolerability, and pharmacokinetics (PK) (absorption, distribution, metabolism, and elimination) of nifurti...
This study assesses the specificity of Chagas Detect™ Plus (CDP) rapid test versus standard reference tests (e.g. RIPA or IFA) for Chagas diagnosis in the US. The Chagas Detect™ Plus ...
A hemoflagellate parasite affecting domestic and wild animals, as well as humans and invertebrates. Though it induces an immune response, it is non-pathogenic in humans and other vertebrates. It is cross-reactive with TRYPANOSOMA CRUZI and can thus cause false positives for CHAGAS DISEASE.
A genus of the subfamily TRIATOMINAE. Several species are vectors of TRYPANOSOMA CRUZI.
A genus of cone-nosed bugs of the subfamily TRIATOMINAE. Its species are vectors of TRYPANOSOMA CRUZI.
A genus of the subfamily TRIATOMINAE. Rhodnius prolixus is a vector for TRYPANOSOMA CRUZI.
The agent of South American trypanosomiasis or CHAGAS DISEASE. Its vertebrate hosts are man and various domestic and wild animals. Insects of several species are vectors.
Antiretroviral Therapy Clostridium Difficile Ebola HIV & AIDS Infectious Diseases Influenza Malaria Measles Sepsis Swine Flu Tropical Medicine Tuberculosis Infectious diseases are caused by pathogenic...
Tropical Medicine is the study of diseases more commonly found in tropical regions than elsewhere. Examples of these diseases are malaria, yellow fever, Chagas disease, Dengue, Helminths, African trypanosomiasis, Leishmaniasis, Leprosy, Lymphatic filaria...
Enzymes are proteins that catalyze (i.e., increase the rates of) chemical reactions. In enzymatic reactions, the molecules at the beginning of the process, called substrates, are converted into different molecules, called products. Almost all chemical re...