Abstract:
BACKGROUND:Schistosoma mansoni venom allergen-like protein (SmVAL) is a gene family composed of 29 members divided into group 1 encoding proteins potentially secreted, and group 2 encoding intracellular components. Some members were found to be upregulated in the transition of germ ball - cercariae - day 3 schistosomula, suggesting that group 1 SmVAL proteins are associated with the invasion of the human host, although their functions are not completely established. Recently, we have described the localization of SmVAL7 (group 1) and SmVAL6 (group 2) transcripts in the oesophageal gland and in the oral and ventral suckers of adult parasites, respectively. The expression patterns of the two genes suggest that SmVAL7 protein plays a role in the blood-feeding process while SmVAL6 is associated with the parasite attachment and movement in the vasculature. In this way, searching for additional secreted SmVAL proteins that could be involved in key processes from skin penetration to the beginning of blood-feeding, we investigated the tissue localization of SmVAL4, 13, 16 and 24 by whole-mount in situ hybridization (WISH). RESULTS:We report here the localization of group 1 SmVAL4 and 24 transcripts in the pre-acetabular glands of developing germ balls. Time course experiments of in vitro cultured schistosomula after cercariae transformation demonstrated that SmVAL4 protein is secreted during the first 3 h of in vitro culture, correlating with the emptying of acetabular glands as documented by confocal microscopy. In addition, the localization of SmVAL13 transcripts in adult male anterior oesophageal gland suggests that the respective protein may be involved in the first steps of the blood-feeding process. SmVAL16 was localized close to the neural ganglia and requires further investigation. CONCLUSIONS:Our findings demonstrate that SmVAL proteins have localizations that place them in strategic positions to be considered as potential vaccine candidates as some members are exposed to interaction with the immune system and may participate in key processes of mammalian invasion and parasitism establishment.
journal_name
Parasit Vectorsjournal_title
Parasites & vectorsauthors
Fernandes RS,Barbosa TC,Barbosa MMF,Miyasato PA,Nakano E,Leite LCC,Farias LPdoi
10.1186/s13071-017-2144-2subject
Has Abstractpub_date
2017-05-08 00:00:00pages
223issue
1issn
1756-3305pii
10.1186/s13071-017-2144-2journal_volume
10pub_type
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
pub_type: 杂志文章
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-015-0916-0
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2014-12-03 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-015-0837-y
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journal_title:Parasites & vectors
pub_type: 杂志文章
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journal_title:Parasites & vectors
pub_type: 杂志文章
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journal_title:Parasites & vectors
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2017-11-09 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-5-139
更新日期:2012-07-10 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2017-04-13 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2018-08-14 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章,评审
doi:10.1186/s13071-016-1719-7
更新日期:2016-08-08 00:00:00
abstract:BACKGROUND:Fleas (Siphonaptera) are the most clinically important ectoparasites of dogs and cats worldwide. Rising levels of pet ownership, climate change and globalisation are increasing the importance of a detailed understanding of the endemicity and prevalence of flea-borne pathogens. This requires continued surveil...
journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2019-02-06 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
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更新日期:2014-04-03 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/s13071-016-1569-3
更新日期:2016-05-27 00:00:00
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journal_title:Parasites & vectors
pub_type: 杂志文章
doi:10.1186/1756-3305-7-223
更新日期:2014-05-14 00:00:00