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dc.contributor.authorLu, Xiaojuanpt_BR
dc.contributor.authorZhang, Zhipengpt_BR
dc.contributor.authorYuan, Dongqipt_BR
dc.contributor.authorZhou, Yongzhipt_BR
dc.contributor.authorCao, Jiept_BR
dc.contributor.authorZhang, Houshuangpt_BR
dc.contributor.authorVaz Junior, Itabajara da Silvapt_BR
dc.contributor.authorZhou, Jinlinpt_BR
dc.date.accessioned2022-01-07T04:27:46Zpt_BR
dc.date.issued2021pt_BR
dc.identifier.issn1756-3305pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/233839pt_BR
dc.description.abstractBackground: It is well established that ecdysteroid hormones play an important role in arthropod development and reproduction, mediated by ecdysteroid receptors. Ticks are obligate hematophagous arthropods and vectors of pathogens. The salivary gland plays an essential role in tick growth and reproduction and in the transmission of pathogens to vertebrate hosts. During tick development, the salivary gland undergoes degeneration triggered by ecdysteroid hormones and activated by apoptosis. However, it is unknown how the ecdysteroid receptor and apoptosis regulate salivary gland degeneration. Here, we report the functional ecdysteroid receptor (a heterodimer of the ecdysone receptor [EcR] and ultraspiracle [USP]) isolated from the salivary gland of the tick Rhipicephalus haemaphysaloides and explore the molecular mechanism of ecdysteroid receptor regulation of salivary gland degeneration. Methods: The full length of RhEcR and RhUSP open reading frames (ORFs) was obtained from the transcriptome. The RhEcR and RhUSP proteins were expressed in a bacterial heterologous system, Escherichia coli. Polyclonal antibodies were produced against synthetic peptides and were able to recognize recombinant and native proteins. Quantitative real-time PCR and western blot were used to detect the distribution of RhEcR, RhUSP, and RhCaspases in the R. haemaphysaloides organs. A proteomics approach was used to analyze the expression profiles of the ecdysteroid receptors, RhCaspases, and other proteins. To analyze the function of the ecdysteroid receptor, RNA interference (RNAi) was used to silence the genes in adult female ticks. Finally, the interaction of RhEcR and RhUSP was identified by heterologous co-expression assays in HEK293T cells. Results: We identified the functional ecdysone receptor (RhEcR/RhUSP) of 20-hydroxyecdysone from the salivary gland of the tick R. haemaphysaloides. The RhEcR and RhUSP genes have three and two isoforms, respectively, and belong to a nuclear receptor family but with variable N-terminal A/B domains. The RhEcR gene silencing inhibited blood-feeding, blocked engorgement, and restrained salivary gland degeneration, showing the biological role of the RhEcR gene in ticks. In the ecdysteroid signaling pathway, RhEcR silencing inhibited salivary gland degeneration by suppressing caspase-dependent apoptosis. The heterologous expression in mammalian HEK293T cells showed that RhEcR1 interacts with RhUSP1 and induces caspase-dependent apoptosis.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofParasites & Vectors. London. Vol. 14 (2021), 612, 17 p.pt_BR
dc.rightsOpen Accessen
dc.subjectReceptor de ecdisonapt_BR
dc.subjectEcdysone receptoren
dc.subjectUltraspiracleen
dc.subjectGlândulas salivarespt_BR
dc.subjectSalivary gland degenerationen
dc.subjectApoptosept_BR
dc.subjectApoptosisen
dc.subjectAlimentaçãopt_BR
dc.subjectRhipicephalus haemaphysaloidespt_BR
dc.subjectTicken
dc.titleThe ecdysteroid receptor regulates salivary gland degeneration through apoptosis in Rhipicephalus haemaphysaloidespt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb001135268pt_BR
dc.type.originEstrangeiropt_BR


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