Peer-reviewed veterinary case report
Leishmania vaccine with sand fly saliva triggers immune response
By Giunchetti, Rodolfo Cordeiro et al.·Published in Vaccine·2008·Laborató, Brazil·View original on PubMed →
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Original publication title: A killed Leishmania vaccine with sand fly saliva extract and saponin adjuvant displays immunogenicity in dogs.
- Species:
- dog
Plain-English summary
A group of dogs was given a new vaccine designed to protect against a serious disease called canine visceral leishmaniasis (CVL), which is caused by a parasite spread by sand flies. The vaccine showed promising results by boosting the dogs' immune responses, with increased levels of specific immune cells that help fight off infections. This suggests that the vaccine could be effective in preventing CVL, but more research is needed to confirm its effectiveness in real-world situations.
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Abstract
A vaccine against canine visceral leishmaniasis (CVL), comprising Leishmania braziliensis promastigote protein, sand fly gland extract (SGE) and saponin adjuvant, was evaluated in dog model, in order to analyse the immunogenicity of the candidate vaccine. The vaccine candidate elicited strong antigenicity in dogs in respect of specific SGE and Leishmania humoral immune response. The major saliva proteins recognized by serum from immunized dogs exhibited molecular weights of 35 and 45 kDa, and were related to the resistance pattern against Leishmania infection. Immunophenotypic analysis revealed increased circulating CD21+ B-cells and CD5+ T-cells, reflected by higher counts of CD4+ and CD8+ T-cells. The observed interaction between potential antigen-presenting cells (evaluated as CD14+ monocytes) and lymphocyte activation status indicated a relationship between innate and adaptive immune responses. The higher frequency in L. chagasi antigen-specific CD8+ T-lymphocytes, and their positive association with intense cell proliferation, in addition to the progressively higher production of serum nitric oxide levels, showed a profile compatible with anti-CVL vaccine potential. Further studies on immunological response after challenge with L. chagasi may provide important information that will lead to a better understanding on vaccine trial and efficacy.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/18180079/