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Vectors and Vector-Borne Parasitic Diseases: Infection, Immunity, and Evolution
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Leishmaniasis: From Innate and Adaptive Immunity to Vaccine Development
The parasitic disease leishmaniasis in its various clinical manifestations from self-resolving skin lesion to deadly systemic infection is a serious health problem in many developing countries and is considered to be a neglected tropical disease by the World Health Organization. To date, a vaccine is lacking and strategies to treat severe forms of leishmaniasis efficiently are missing. Basic research using animal models of experimental visceral or cutaneous leishmaniasis has allowed to dissect the immune response to parasitic pathogens and has contributed substantially to many important, paradigm-changing insights such as the role of cytokines in helper T-cell differentiation and the impact ...
Control of Visceral Leishmaniasis by Immunotherapeutic and Prophylactic Strategies
Visceral leishmaniasis (VL) or kala-azar is the most dreadful of all forms of leishmaniasis caused by Leishmania donovani in Old World and Leishmania chagasi and/or Leishmania infantum in New World affecting millions of people worldwide. In active VL, macrophages host the replicating amastigotes in phagolysosomal compartments leading to splenomegaly, hepatomegaly, hyperglobulinemia, anemia, weight-loss, incessant fever and ultimately death if not treated. Treatments available against the disease are limited by increased incidence of resistance, serious side-effects, high cost and long course of treatment. Immuno-chemotherapy is an alternative to overcome the limitations of the drugs against ...
The Role of Cytosolic Sensors in Host Defense to Intracellular Pathogens
Innate immunity is the first arm of the immune system to be triggered in host defense against intracellular pathogens. Some pathogens during evolution have developed stealthy strategies to bypass innate surface receptors but when they reach host cell cytosol they are recognized by cytosolic receptors. Professional phagocytes, such as macrophages, neutrophils, or dendritic cells, have the specialized ability to internalize pathogens into membrane-bound compartments, termed phagosomes. Additionally, pathogen phagocytosis effectively guarantees the concentrated delivery of pathogen-associated molecular patterns (PAMPs) inside cells. Some pathogens can exit phagosomes and survive and replicate i...
Interaction of Trypanosoma cruzi with Host Cells
Trypanosoma cruzi is a pathogenic protozoan of the Trypanosomatidade Family, which is the etiological agent of Chagas’ disease. Chagas’ disease stands out for being endemic among countries in Latin America, affecting about 15 million people. Recently, Chagas has become remarkable in European countries as well due to cases of transmission via infected blood transfusion. An important factor that has exacerbated the epidemiological picture in Brazil, Colombia and Venezuela is infection after the oral intake of contaminated foods such as sugar cane, açai and bacaba juices. Trypanosoma cruzi is an intracellular protozoan that exhibits a complex life cycle, involving multiple developmental st...
Immune evasion strategies in protozoan-host interactions
The protozoa are the most ancient members of the animal kingdom and they have evolved the intracellular parasitism to ensure their survival strategies. Protozoan parasites that infect humans are extremely diverse among eukaryotes. They are responsible for many human diseases such as amebiasis, Chagas disease, malaria, toxoplasmosis, leishmaniasis and African sleeping sickness. The ability of protozoans to cause disease depends on the nature and number of infecting organisms, the route of infection, the virulence factors associated with the microorganism, and the strength of host defenses. This host-parasite interaction is also subject to constant change as the infection proceeds and can lead...
Advances in The Immunology of Host Defense Peptide: Mechanisms and Applications of Antimicrobial Functions and Beyond
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Why Vaccines to HIV, HCV and Malaria Have So Far Failed - Challenges to Developing Vaccines against Immunoregulating Pathogens
Despite continuous progress in the development of anti-viral and anti-bacterial/parasite drugs, the high cost of medicines and the potential for re-infection, especially in high risk groups, suggest that protective vaccines to some of the most dangerous persistent infections are still highly desirable. There are no vaccines available for HIV, HCV and Malaria, and all attempts to make a broadly effective vaccine have failed so far. In this Research Topic we look into why vaccines have failed over the years, and what we have learn from these attempts. Rather than only showing positive results, this issue aims to reflect on failed efforts in vaccine development. Coming to understand our limitations will have theoretical and practical implications for the future development of vaccines to these major global disease burdens.
How Salmonella infection can inform on mechanisms of immune function and homeostasis
The use of model antigens such as haptens and ovalbumin has provided enormous insights into how immune responses develop, particularly to vaccine antigens. Furthermore, these studies are overwhelmingly performed in animals housed in clean facilities and are not known to have experienced overt clinical signs caused by infectious agents. Therefore, this is unlikely to reflect the impact more complex host-pathogen interactions can have on the host, nor the diversity in how immunity is regulated. Humans develop immune responses in the context of the periodic exposure to multiple pathogens and vaccines over a life-time. These are likely to have a long-lasting effect on who and what we are and how...
Sesquiterpene Lactones
This book addresses chemical and biological aspects related to sesquiterpene lactones (STLs). Experts in different fields have been invited to contribute on this class of compound's chemistry, isolation and identification, biological activities (antibacterial, antifungal, antiviral, antitrypanosomal, antileishmanial,antiplasmodial, antiproliferative and antiinflammatory), synthesis, biosynthesis, derivatization and QSAR analysis. Taxonomic and chemotaxonomic aspects related to the Asteraceae family are also contributed. The book begins by describing the chemical characteristics of STLs, their classification in different skeleton types, synthesis, distribution in nature and their most importa...
