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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

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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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Correspondence to Jin Boo Jeong.

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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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