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Characterization of fibroblast growth factor receptor 4 (FGFR4) from the red swamp crayfish Procambarus clarkii and its role in antiviral and antimicrobial immune responses. | LitMetric

AI Article Synopsis

Article Abstract

FGFRs involved multiple physiological processes, such as endocrine homeostasis, wound repair, and cellular behaviors including proliferation, differentiation and survival. In the present study, the homologs of fibroblast growth factor receptor 4 (FGFR4) were identified and characterized from the red swamp crayfish Procambarus clarkii for the first time. The full-length cDNAs of pcFGFR4 were 2878 bp with 2451 bp open reading frame (ORF), respectively. The deduced pcFGFR4 protein contained an immunoglobulin, two immunoglobulin C-2 Type, a transmembrane region and a catalytic domain. Real-time PCR analysis showed that pcFGFR4 were highly expressed in muscle and hemocyte. Moreover, the expression levels of pcFGFR4 in the hepatopancreas and hemocyte were positively stimulated after challenge with Aeromonas hydrophila and WSSV, implying the involvement of pcFGFR4 against bacterial and viral infections in innate immune responses. While pcFGFR4 were silenced in vivo, the expression levels of antimicrobial peptide (AMP) genes (pcALF1-5,8 and pcCrustin1-2) and NF-κB signaling components (pcDrosal and pcRelish) were significantly reduced. Additionally, NF-κB signaling could be markedly activated by overexpression of pcFGFR4 in HEK293T cells. Finally, our results indicated that pcFGFR4 regulated crayfish's innate immunity by modulating NF-κB signaling. These findings may provide new insights into pcFGFR4-mediated signaling cascades in crustaceans and provide a better understanding of crustacean innate immune system.

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http://dx.doi.org/10.1016/j.jip.2022.107865DOI Listing

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