Abstract:
:In dipteran insects, invading pathogens are selectively recognized by four major pathways, namely Toll, IMD, JNK, and JAK/STAT, and trigger the activation of several immune effectors. Although substantial advances have been made in understanding the immunity of model insects such as Drosophila melanogaster, knowledge on the activation of immune responses in other arthropods such as ticks remains limited. Herein, we have deepened our understanding of the intracellular signalling pathways likely to be involved in tick immunity by combining a large-scale in silico approach with high-throughput gene expression analysis. Data from in silico analysis revealed that although both the Toll and JAK/STAT signalling pathways are evolutionarily conserved across arthropods, ticks lack central components of the D. melanogaster IMD pathway. Moreover, we show that tick immune signalling-associated genes are constitutively transcribed in BME26 cells (a cell lineage derived from embryos of the cattle tick Rhipicephalus microplus) and exhibit different transcriptional patterns in response to microbial challenge. Interestingly, Anaplasma marginale, a pathogen that is naturally transmitted by R. microplus, causes downregulation of immune-related genes, suggesting that this pathogen may manipulate the tick immune system, favouring its survival and vector colonization.
journal_name
Dev Comp Immunoljournal_title
Developmental and comparative immunologyauthors
Rosa RD,Capelli-Peixoto J,Mesquita RD,Kalil SP,Pohl PC,Braz GR,Fogaça AC,Daffre Sdoi
10.1016/j.dci.2015.12.018subject
Has Abstractpub_date
2016-06-01 00:00:00pages
1-14eissn
0145-305Xissn
1879-0089pii
S0145-305X(15)30101-4journal_volume
59pub_type
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