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Total 578 results found since Jan 2013.
Preliminary studies on the immunogenicity of a prime-and-trap malaria vaccine in nonhuman primates
Vaccine. 2023 Aug 8:S0264-410X(23)00913-1. doi: 10.1016/j.vaccine.2023.07.067. Online ahead of print.ABSTRACTDevelopment of next-generation vaccines against Plasmodium falciparum (Pf) is a priority. Many malaria vaccines target the pre-erythrocytic sporozoite (SPZ) and liver stages. These include subunit vaccines based on the Pf circumsporozoite protein (CSP) and attenuated PfSPZ vaccines. However, these strategies require 3-4 doses and have not achieved optimal efficacy against field-transmitted malaria. Prime-and-trap is a recently developed two-step heterologous vaccine strategy that combines priming with DNA encoding C...
Source: Vaccine - August 10, 2023 Category: Allergy & Immunology Authors: Melanie J Shears Felicia N Watson Brad C Stone Irene Cruz Talavera Chaitra Parthiban Jokichi Matsubara Natasha Kc B Kim Lee Sim Stephen L Hoffman Sean C Murphy Source Type: research
Recent advances in genome editing of bloodstream forms of Trypanosoma congolense using CRISPR-Cas9 ribonucleoproteins: Proof of concept
We present an efficient, reproducible and stable CRISPR-Cas9 genome editing system for use in Tc bloodstream forms (Tc-BSF). This plasmid-free system is based on transient expression of Cas9 protein and the use of a ribonucleoprotein formed by the Cas9 and sgRNA complex. This is the first proof of concept of genome editing using CRISPR-Cas9 ribonucleoproteins on Tc-BSF. This adapted protocol enriches the "toolbox" for the functional study of genes of interest in blood forms of the Trypanosoma congolense. This proof of concept is an important step for the scientific community working on the study of trypanosomes and opens u...
Source: Experimental Parasitology - July 29, 2023 Category: Parasitology Authors: C écile Minet Isabelle Chantal David Berthier Source Type: research
The association between rLiHyp1 protein plus adjuvant and amphotericin B is an effective immunotherapy against visceral leishmaniasis in mice
In this study, we evaluated an immunotherapy protocol in a murine model by combining recombinant (r)LiHyp1 (a hypothetical amastigote-specific Leishmania protein protective against Leishmania infantum infection), with monophosphoryl-lipid A (MPLA) as adjuvant and amphotericin B (AmpB) as reference antileishmanial drug. We used this protocol to treat L. infantum infected-BALB/c mice, and parasitological, immunological and toxicological evaluations were performed at 1 and 30 days after treatment. Results showed that mice treated with rLiHyp1/MPLA/AmpB presented the lowest parasite burden in all organs evaluated, when both a ...
Source: Acta Tropica - July 15, 2023 Category: Infectious Diseases Authors: Daniela P Lage V ívian T Martins Danniele L Vale Camila S Freitas Breno L Pimenta Gabriel J L Moreira Fernanda F Ramos Isabela A G Pereira Raquel S Bandeira Marcelo M de Jesus Fernanda Ludolf Grasiele S V Tavares Miguel A Ch ávez-Fumagalli Bruno M Roatt Source Type: research
Degrade to survive: the intricate world of piroplasmid proteases
Trends Parasitol. 2023 Jun 2:S1471-4922(23)00118-6. doi: 10.1016/j.pt.2023.04.010. Online ahead of print.ABSTRACTPiroplasmids of the genera Babesia, Theileria, and Cytauxzoon are tick-transmitted parasites with a high impact on animals and humans. They have complex life cycles in their definitive arthropod and intermediate vertebrate hosts involving numerous processes, including invasion of, and egress from, host cells, parasite growth, transformation, and migration. Like other parasitic protozoa, piroplasmids are equipped with different types of protease to fulfill many of such essential processes. Blockade of some key pr...
Source: Trends in Parasitology - June 4, 2023 Category: Parasitology Authors: Monica Florin-Christensen Daniel Sojka Sabrina Ganzinelli Pavla Šnebergerová Carlos E Suarez Leonhard Schnittger Source Type: research
Apicomplexan parasites are attenuated by low-energy electron irradiation in an automated microfluidic system and protect against infection with Toxoplasma gondii
In this study, we evaluated for the first time low-energy electron irradiation (LEEI) as a method to generate replication-deficient Toxoplasma gondii and Cryptosporidium parvum. Similar to other radiation technologies, LEEI mainly damages nucleic acids; however, it is applicable in standard laboratories. By using a novel, continuous, and microfluidic-based LEEI process, tachyzoites of T. gondii and oocysts of C. parvum were irradiated and subsequently analyzed in vitro. The LEEI-treated parasites invaded host cells but were arrested in intracellular replication. Antibody-based analysis of surface proteins revealed no signi...
Source: Cell Research - May 26, 2023 Category: Cytology Authors: Julia Finkensieper Florian Mayerle Zaida Renter ía-Solís Jasmin Fertey Gustavo R Makert Franziska Lange Joana Besecke Simone Schopf Andre Poremba Ulla K önig Bastian Standfest Martin Thoma Arwid Daugschies Sebastian Ulbert Source Type: research
Exploring the performance of Escherichia coli outer membrane vesicles as a tool for vaccine development against Chagas disease
CONCLUSION: These results open the range for further research on the design of new carrier strategies focused on innate immunity activation as an additional immunization target and venture to seek for alternative forms in which OMVs could be used for optimizing vaccine development.PMID:37222309 | DOI:10.1590/0074-02760220263
Source: Memorias do Instituto Oswaldo Cruz - May 24, 2023 Category: Infectious Diseases Authors: Mar ía Elisa Vázquez Andrea Cecilia Mes ías Leonardo Acu ña Joseph Spangler Brenda Zabala Cecilia Parodi Meghna Thakur Eunkeu Oh Scott Allan Walper Cecilia P érez Brandán Source Type: research
