Abstract
Objective
Recently, Rodgersia podophylla has been reported to exhibit anti-inflammatory activity. However, little is known about the potential mechanisms about its anti-inflammatory activity. We elucidated the anti-inflammatory mechanisms of leaves extracts from Rodgersia podophylla (RP-L) in RAW264.7 cells.
Materials and methods
LPS-induced NO was measured by Griess and mRNA of pro-inflammatory mediators was analyzed by RT-PCR. Cell viability was measured using MTT assay. The protein level was analyzed by Western blot.
Results
RP-L significantly inhibited the production of the pro-inflammatory mediators such as NO, iNOS, IL-1β and IL-6 in LPS-stimulated RAW264.7 cells. RP-L increased HO-1 expression in RAW264.7 cells, and the inhibition of HO-1 by ZnPP reduced the inhibitory effect of RP-L against LPS-induced NO production in RAW264.7 cells. Inhibition of p38, ROS and GSK3β attenuated RP-L-mediated HO-1 expression. Inhibition of ROS inhibited p38 phosphorylation and GSK3β expression induced by RP-L. In addition, inhibition of GSK3β blocked RP-L-mediated p38 phosphorylation. RP-L induced nuclear accumulation of Nrf2, and inhibition of p38, ROS and GSK3β abolished RP-L-mediated nuclear accumulation of Nrf2. Furthermore, RP-L blocked LPS-induced degradation of IκB-α and nuclear accumulation of p65. RP-L also attenuated LPS-induced phosphorylation of ERK1/2 and p38. In GC/MS analysis of RP-L, pyrogallol was detected as bioactive compound for anti-inflammatory activity of RP-L. Pyrogallol was observed to activate HO-1 expression through ROS/GSK3β/p38/Nrf2/HO-1 signaling.
Conclusions
Our results suggest that RP-L exerts potential anti-inflammatory activity by activating ROS/GSK3β/p38/Nrf2/HO-1 signaling and inhibiting NF-κB and MAPK signaling in RAW264.7 cells. These findings suggest that RP-L may have great potential for the development of anti-inflammatory drug.
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Abbreviations
- CO:
-
Carbon monoxide
- COX-2:
-
Cyclooxygenase-2
- DMSO:
-
Dimethyl sulfoxide
- ERK1/2:
-
Extracellular signal-regulated kinases 1/2
- GSK3β:
-
Glycogen synthase kinase 3 beta
- HO-1:
-
Heme oxygenase-1
- IKK:
-
IκB kinase
- IL-1β:
-
Interleukin-1β
- IL-6:
-
Interleukin-6
- iNOS:
-
Inducible nitric oxide synthase
- LPS:
-
Lipopolysaccharide
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide
- JNK:
-
C-Jun N-terminal kinases
- MAPKs:
-
Mitogen-activated protein kinases
- NAC:
-
N-Acetyl-l-cysteine
- NF-κB:
-
Nuclear factor-κB
- NO:
-
Nitric oxide
- Nrf2:
-
NF-E2-related factor 2
- NSAIDs:
-
Nonsteroidal anti-inflammatory drugs
- PI3K:
-
Phosphoinositide 3-kinase
- ROS:
-
Reactive oxygen species
- RP-L:
-
Leave extracts from Rodgersia podophylla
- RT-PCR:
-
Reverse transcriptase-polymerase chain reaction
- ZnPP:
-
Zinc protoporphyrin IX
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Acknowledgements
This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2016R1D1A3B03931713 and NRF-2018R1A6A1A03024862).
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Kim, H.N., Kim, J.D., Park, S.B. et al. Anti-inflammatory activity of the extracts from Rodgersia podophylla leaves through activation of Nrf2/HO-1 pathway, and inhibition of NF-κB and MAPKs pathway in mouse macrophage cells. Inflamm. Res. 69, 233–244 (2020). https://doi.org/10.1007/s00011-019-01311-2
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DOI: https://doi.org/10.1007/s00011-019-01311-2