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2016 ; 5
(5
): 623-628
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Oxymatrine inhibits microglia activation via HSP60-TLR4 signaling
#MMPMID27882228
Ding F
; Li Y
; Hou X
; Zhang R
; Hu S
; Wang Y
Biomed Rep
2016[Nov]; 5
(5
): 623-628
PMID27882228
show ga
Oxymatrine (OMT) is an alkaloid extracted from Sophora flavescens, which has
broad anti-inflammatory, antitumor and immunosuppressant actions. However, the
underlying molecular mechanisms have remained elusive. Heat shock protein 60
(HSP60) has recently been shown to have an important role in autoimmune
reactions. The present study aimed to investigate whether OMT exerts its
anti-inflammatory effects by inhibiting microglial activation and examined the
role of HSP60 in this process. Western blot analysis and ELISA showed that OMT
decreased the expression and release of HSP60 by LPS-activated BV2 cells. The
expression of heat shock factor 1, the transcription factor of HSP60, was also
suppressed by OMT. Extracellular HSP60 has been previously indicated to induce
microglial apoptosis through the Toll-like receptor (TLR)-4 pathway. Flow
cytometric analysis demonstrated that LPS treatment induced apoptosis of BV2
cells, which was inhibited by OMT in parallel with inhibition of LPS-induced
expression of TLR-4. Furthermore, OMT was shown to suppress the levels of myeloid
differentiation factor (MYD)88, nuclear factor (NF)-?B, caspase-3, inducible
nitric oxide synthase, tumor necrosis factor-?, interleukin (IL)-1? and IL-6. In
light of these results, it was concluded that OMT may exert its neuroprotective
effects via HSP60/TLR-4/MYD88/NF-?B signaling pathways to inhibit microglial
activation. OMT may therefore offer substantial therapeutic potential for
treating neurodegenerative diseases associated with microglial activation.