a b s t r a c t
Toll-like receptors (TLRs) play the important roles in the innate immune system. In the present study, we
have cloned fragments of 13 members of TLR family in natural triploid Qihe crucian carp (C. auratus) and
investigated the expression profiles of these TLRs in spleen and head kidney at different time points after
A. hydrophila infection. The results showed that the expressions of certain TLRs including TLR4, TLR5,
and TLR22 were significantly up-regulated after infection, and the expression levels of TLR5 and TLR22
were the highest in spleen with 52.56-fold and 28.14-fold increase, respectively, whereas the other TLRs
were down-regulated or no significant changes were observed compared with the control at most time
points. These findings suggested that three TLRs (TLR4, TLR5, and TLR22) may play important roles in the
immune responses of C. auratus to A. hydrophila infection. Additionally, the expression of most TLRs was
significantly up-regulated at 6 h post infection, which implied that the immune response of C. auratus
reached the highest level at this time point. This work will facilitate our comprehensive understanding
for the functions of TLRs in the process of bacterial infection in C. auratus and provide new insights for
developing preventive and therapeutic measures against A. hydrophila infection.
a b s t r a c tToll-like receptors (TLRs) play the important roles in the innate immune system. In the present study, wehave cloned fragments of 13 members of TLR family in natural triploid Qihe crucian carp (C. auratus) andinvestigated the expression profiles of these TLRs in spleen and head kidney at different time points afterA. hydrophila infection. The results showed that the expressions of certain TLRs including TLR4, TLR5,and TLR22 were significantly up-regulated after infection, and the expression levels of TLR5 and TLR22were the highest in spleen with 52.56-fold and 28.14-fold increase, respectively, whereas the other TLRswere down-regulated or no significant changes were observed compared with the control at most timepoints. These findings suggested that three TLRs (TLR4, TLR5, and TLR22) may play important roles in theimmune responses of C. auratus to A. hydrophila infection. Additionally, the expression of most TLRs wassignificantly up-regulated at 6 h post infection, which implied that the immune response of C. auratusreached the highest level at this time point. This work will facilitate our comprehensive understandingfor the functions of TLRs in the process of bacterial infection in C. auratus and provide new insights fordeveloping preventive and therapeutic measures against A. hydrophila infection.
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