Abstract
Mastitis, inflammation in the breast, affects breastfeedingwomenin the postpartumperiod. In the present study, we investigated the protective effects of piperine against mastitis using a mouse mastitis model. LPS-induced mastitis was established by injecting LPS into the canals of the mammary gland. Piperine was given intraperitoneally 1 h before and 12 h after LPS treatment. The results showed that the LPS-induced mammary histopathological changes and MPO activity were attenuated by piperine. LPS-induced inflammatory cytokines TNF-α andIL-1β were also inhibited by piperine. Furthermore, LPS-induced NF-κB activation was suppressed by the treatment with piperine. In addition, we found piperine dose-dependently increased the expression of PPARγ. All of these results suggested that piperine had protective effects against LPS-induced mastitis and that the mechanism may be mediated through the activation of PPARγ.
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