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Control of Visceral Leishmaniasis by Immunotherapeutic and Prophylactic Strategies

Authors: --- --- ---
Book Series: Frontiers Research Topics ISSN: 16648714 ISBN: 9782889195527 Year: Pages: 144 DOI: 10.3389/978-2-88919-552-7 Language: English
Publisher: Frontiers Media SA
Subject: Public Health --- Medicine (General) --- Allergy and Immunology
Added to DOAB on : 2016-01-19 14:05:46
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Abstract

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 VL. Combination of one or more of immunotherapeutic agents like BCG, Alum, IFN-?, antigen-pulsed dendritic cells (DC), etc. with chemotherapeutic drugs have been tested raising hopes for a suitable immuno-chemotherapy against VL and Post Kala-azar Dermal Leishmaniasis (PKDL). Antagonists of IL-10, TGF-ß, IL-13 have been effectively used with pentavalent antimonials in treatment of experimental VL. Some parasitic antigens and liposomal formulations have also been shown to impart superior therapeutic effectiveness to antileishmanial drugs. For socio-economic reasons prophylaxis is always more desirable than therapy. Although no vaccine against any form of leishmaniasis in humans is available, patients successfully treated show considerable protection from reinfection highlighting the possibility of developing prophylactic measures against the disease. Subsequently a lot of interest has been focused recently towards developing vaccines against VL and many potential vaccine candidates like whole cell (attenuated or heat killed), crude fractions, purified subunits, DNAs, recombinant proteins, fusion proteins, and genetically modified live attenuated parasites etc. have been reported. These vaccine candidates are either activators of CD4+Th1 cells and/or CD8+ T cells or neutralizers of immuno-suppression. Cationic liposomal formulations, nanoparticle and virosome delivery systems, etc. have been used to increase potency and durability of various vaccine candidates. Immuno-modulators like TLR agonists have been shown to be promising adjuvants in enhancing efficacy and overcoming the challenge of human administrable vaccine formulations. Recently role of sand fly salivary gland proteins as immune-modulators also has been explored. Various strategies such as heterologous prime boosting, targeted antigen delivery, adjuvant mediated protection, have been undertaken. Likewise, precise role of regulatory T cells (Tregs) in VL disease progression needs to be investigated and exploited to develop both immuno-therapeutic and prophylactic methods. A breakthrough in immunotherapy and prophylactic strategy would help in eradication of the parasites from the pool of natural reservoirs namely VL and PKDL patients, asymptomatic carrier individuals and infected dogs ensuring success of global VL control programs.

Prospects for Schistosomiasis Elimination

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ISBN: 9783039213573 9783039213580 Year: Pages: 308 DOI: 10.3390/books978-3-03921-358-0 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Medicine (General) --- Internal medicine
Added to DOAB on : 2019-12-09 11:49:15
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Abstract

Current efforts to limit the ravages of schistosomiasis are pushing the world closer to eliminating a chronic infection that has been associated with human life in the tropics since time immemorial. This notwithstanding, the disease remains a scourge for large populations in sub-Saharan Africa, Latin America, and Southeast Asia, and the main part of this book is made up by papers dealing with its current distribution, discussing ways and means to establish and implement improved control approaches. While chemotherapy limits the symptoms caused by schistosomiasis, the number of infected people will not decrease until the parasite's life cycle is interrupted. To that end, some papers focus on the intermediate snail host, which is notoriously difficult to control, while others discuss human hygiene and sanitation. The latter approach not only prevents infection through avoiding people being infected from the snail, but more importantly, also stops people infecting the snail by leaving contagious feces and urine in nature. With morbidity reduced by chemotherapy, the immediate target now is the interruption of transmission to be achieved by new tools, such as the novel chemotherapies, improved diagnostics (for humans, animals, and snails), and vaccines discussed in several of the papers. As made clear in this book, a complex infection requires new tools as well as work on many fronts, above all; however, a clear idea is needed as to how to skillfully combine the tools available and sustain implemented control activities.

Keywords

schistosomiasis --- Schistosoma --- vaccine --- zoonosis --- Asia --- Africa --- domestic animals --- buffalo --- cattle --- sheep --- goats --- Côte d’Ivoire --- coverage rate --- praziquantel --- preventive chemotherapy --- Schistosoma haematobium --- Schistosoma mansoni --- schistosomiasis --- diagnosis --- control and elimination --- DNA --- polymerase chain reaction --- schistosomiasis --- control --- elimination --- Africa --- operational research --- goals --- guidelines --- schistosomiasis --- vector control --- snail resistance --- gene drive --- transgenic snail --- schistosomiasis --- Kato-Katz --- POC-CCA --- young adults --- soil-transmitted helminths --- n/a --- Mayuge --- MDA coverage --- praziquantel --- S. mansoni --- systematic non-compliance --- treatment-opportunities --- Uganda --- climate change --- schistosomiasis --- distribution --- intermediate snail host --- transmission --- modelling --- schistosomiasis --- soil-transmitted-helminthiasis --- mapping --- preventive chemotherapy --- transmission control --- Gabon --- Central Africa --- schistosomiasis --- vaccine --- Sm14 --- FABP --- Schistosoma japonicum --- Oncomelania hupensis --- snail --- 28S ribosomal DNA --- PCR --- loop-mediated isothermal amplification (LAMP) --- pooled samples --- China --- schistosomiasis --- elimination --- praziquantel --- artemether --- combination therapy --- phylogeography --- Bulinus truncatus --- planorbidae --- Africa --- schistosomiasis --- neglected tropical diseases --- WIPO Re:Search --- BIO Ventures for Global Health --- cross-sector collaboration --- capacity-building --- drug discovery --- public-private partnerships --- GIS --- remote-sensing --- satellite --- international space station --- ECOSTRESS --- worldview --- spatio-temporal epidemiology --- climate change --- parasite --- schistosomiasis, leishmaniasis --- n/a --- schistosomiasis --- systems epidemiology --- systems thinking --- complexity --- neglected tropical diseases --- interdisciplinarity --- Schistosomiasis mansoni --- Caribbean --- elimination --- snail control --- Biomphalaria glabrata --- Schistosoma mekongi --- Neotricula aperta --- snail --- Cambodia --- Lao PDR --- elimination --- Asia --- control --- elimination --- epidemiology --- Schistosoma japonicum --- Schistosoma malayensis --- Schistosoma mekongi --- schistosomiasis --- Schistosomiasis --- Philippines --- schistosomiasis elimination --- S. japonicum zoonosis --- bovines --- schistosomiasis elimination --- snail control --- high-sensitivity diagnostics --- chemotherapy --- vaccine development --- health education --- sanitation

Arthropod Venom Components and Their Potential Usage

Authors: ---
ISBN: 9783039285402 9783039285419 Year: Pages: 404 DOI: 10.3390/books978-3-03928-541-9 Language: English
Publisher: MDPI - Multidisciplinary Digital Publishing Institute
Subject: Public Health --- Medicine (General)
Added to DOAB on : 2020-04-07 23:07:09
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Abstract

Thousands of arthropod species, ranging from arachnids (spiders and scorpions) to hymenopterans (ants, bees, and wasps) and myriapods (centipedes), are venomous and use their venoms for both defense and predation. These venoms are invariably harmful to humans, and some may cause serious injuries, e.g., those from scorpions, spiders, and wasps. Arthropods’ venoms are also known as rich sources of biologically active compounds and have attracted the attention of toxin researchers for years. In this century, venom component analysis has progressed considerable due to the advances in analytical techniques, in particular, mass spectrometry and next-generation deep (DNA and RNA) sequencing. As such, proteomic and peptidomic analyses using LC–MS have enabled the full analysis of venom components, revealing a variety of novel peptide and protein toxins sequences and scaffolds, potentially useful as pharmacological research tools and for the development of highly selective peptide ligands and therapeutic leads, like chlorotoxin. Due to their specificity for numerous ion-channel subtypes, including voltage- and ligand-gated ion channels, arthropod neurotoxins have been investigated to dissect and treat neurodegenerative diseases and control epileptic syndromes. This Special Issue collects information on such progress, encouraging contributions on the chemical and biological characterization of venom components, not only peptides and proteins, but also small molecules, their mechanisms of action, and the development of venom-derived peptide leads.

Keywords

ant --- venom --- mass spectrometry analysis --- pilosulin-like peptide --- phospholipases D --- metalloproteases --- Loxosceles spp. --- recombinant toxins --- hybrid immunogen --- neutralizing antibodies --- antivenoms --- LyeTxI-b --- Staphylococcus aureus --- keratitis --- AMP --- mastoparan --- Acinetobacter baumannii --- stent --- cantharidin --- blister beetle --- Berberomeloe majalis --- nematicide --- ixodicide --- antifeedant --- scorpion venom --- insecticidal peptide --- mass spectrometric analysis --- de novo sequencing --- Centruroides limpidus Karch --- proteome --- scorpion --- transcriptome --- venom toxicity --- brown spider --- venom --- Loxosceles --- toxins --- biotools --- drug targets --- novel therapeutics --- spider toxin --- directed disulfide bond formation --- Nav channel activity --- Nav1.7 --- pain target --- automated patch-clamp --- bee venom --- alternative treatment --- skin --- cutaneous disease --- mechanism --- chemotherapy --- cold allodynia --- mechanical allodynia --- melittin --- neuropathic pain --- oxaliplatin --- natural antibiotics --- piperidine heterocyclic amines --- industrial biotechnology --- LTQ Orbitrap Hybrid Mass Spectrometer --- myrmecology --- venom --- pain --- ants --- wasps --- bees --- Hymenoptera --- envenomation --- toxins --- peptides --- pharmacology --- Dinoponera quadriceps --- Formicidae --- Hymenoptera venom --- proteomics --- venom allergens --- ICK-like toxins --- melittin --- insect immune system --- apoptosis --- heart contractility --- Tenebrio molitor --- bee venom --- bioinformatics --- computational docking --- homology modelling --- ion channel structure --- protein–peptide interactions --- tertiapin --- venom peptides --- virtual screening --- small hive beetle --- solitary wasp --- venom --- antimicrobial peptide --- linear cationic ?-helical peptide --- amphipathic ?-helix structure --- channel-like pore-forming activity --- antimicrobial peptide --- venom --- arthropod --- malaria --- Chagas disease --- human African trypanosomiasis --- leishmaniasis --- toxoplasmosis --- venom peptides --- FMRF-amide --- insect neurotoxin --- protons --- pH regulation --- acid-sensing ion channels --- acid-gated currents --- chronic pain --- ICK peptide --- knottins --- NaV --- spider venom --- voltage-gated sodium channel --- n/a

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