Abstract
Background: Tiliroside is a dietary glycosidic flavonoid which has shown in vivo anti-inflammatory activity. This study is aimed at evaluating the effect of tiliroside on neuroinflammation in BV2 microglia, and to identify its molecular targets of anti-neuroinflammatory action.
Methods: BV2 cells were stimulated with LPS + IFNγ in the presence or absence of tiliroside. TNFα, IL-6, nitrite and PGE2production was determined with ELISA, Griess assay and enzyme immunoassay, respectively. iNOS, COX-2, phospho-p65, phospho-IκBα, phospho-IKKα, phospho-p38, phospho-MK2, phosopho-MKK3/6 and TRAF-6 were determined by western blot analysis. NF-κB activity was also investigated using a reporter gene assay in HEK293 cells. LPS-induced microglia ROS production was tested using the DCFDA method, while HO-1 and Nrf2 activation was determined with western blot.
Results: Tiliroside significantly suppressed TNFα, IL-6, nitrite and PGE2production, as well as iNOS and COX-2 protein expression from LPS + IFNγ-activated BV2 microglia. Further mechanistic studies showed that tiliroside inhibited neuroinflammation by targeting important steps in the NF-κB and p38 signalling in LPS + IFNγ-activated BV2 cells. This compound also inhibited LPS-induced TRAF-6 protein expression in BV2 cells. Antioxidant activity of tiliroside in BV2 cells was demonstrated through attenuation of LPS + IFNγ-induced ROS production and activation of HO-1/Nrf2 antioxidant system.
Conclusions: Tiliroside inhibits neuroinflammation in BV2 microglia through a mechanism involving TRAF-6-mediated activation of NF-κB and p38 MAPK signalling pathways. These activities are possibly due, in part, to the antioxidant property of this compound.
General Significance: Tiliroside is a potential novel natural compound for inhibiting neuroinflammation in neurodegenerative disorders.
| Original language | English |
|---|---|
| Pages (from-to) | 3311-3319 |
| Number of pages | 9 |
| Journal | Biochimica et Biophysica Acta - General Subjects |
| Volume | 1840 |
| Issue number | 12 |
| Early online date | 23 Aug 2014 |
| DOIs | |
| Publication status | Published - Dec 2014 |
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Tiliroside, a dietary glycosidic flavonoid, inhibits TRAF-6/NF-κB/p38-mediated neuroinflammation in activated BV2 microglia. / Velagapudi, Ravikanth; Aderogba, Mutallib; Olajide, Olumayokun A.
In: Biochimica et Biophysica Acta - General Subjects, Vol. 1840, No. 12, 12.2014, p. 3311-3319.Research output: Contribution to journal › Article
TY - JOUR
T1 - Tiliroside, a dietary glycosidic flavonoid, inhibits TRAF-6/NF-κB/p38-mediated neuroinflammation in activated BV2 microglia
AU - Velagapudi, Ravikanth
AU - Aderogba, Mutallib
AU - Olajide, Olumayokun A.
PY - 2014/12
Y1 - 2014/12
N2 - Background: Tiliroside is a dietary glycosidic flavonoid which has shown in vivo anti-inflammatory activity. This study is aimed at evaluating the effect of tiliroside on neuroinflammation in BV2 microglia, and to identify its molecular targets of anti-neuroinflammatory action.Methods: BV2 cells were stimulated with LPS + IFNγ in the presence or absence of tiliroside. TNFα, IL-6, nitrite and PGE2production was determined with ELISA, Griess assay and enzyme immunoassay, respectively. iNOS, COX-2, phospho-p65, phospho-IκBα, phospho-IKKα, phospho-p38, phospho-MK2, phosopho-MKK3/6 and TRAF-6 were determined by western blot analysis. NF-κB activity was also investigated using a reporter gene assay in HEK293 cells. LPS-induced microglia ROS production was tested using the DCFDA method, while HO-1 and Nrf2 activation was determined with western blot.Results: Tiliroside significantly suppressed TNFα, IL-6, nitrite and PGE2production, as well as iNOS and COX-2 protein expression from LPS + IFNγ-activated BV2 microglia. Further mechanistic studies showed that tiliroside inhibited neuroinflammation by targeting important steps in the NF-κB and p38 signalling in LPS + IFNγ-activated BV2 cells. This compound also inhibited LPS-induced TRAF-6 protein expression in BV2 cells. Antioxidant activity of tiliroside in BV2 cells was demonstrated through attenuation of LPS + IFNγ-induced ROS production and activation of HO-1/Nrf2 antioxidant system.Conclusions: Tiliroside inhibits neuroinflammation in BV2 microglia through a mechanism involving TRAF-6-mediated activation of NF-κB and p38 MAPK signalling pathways. These activities are possibly due, in part, to the antioxidant property of this compound.General Significance: Tiliroside is a potential novel natural compound for inhibiting neuroinflammation in neurodegenerative disorders.
AB - Background: Tiliroside is a dietary glycosidic flavonoid which has shown in vivo anti-inflammatory activity. This study is aimed at evaluating the effect of tiliroside on neuroinflammation in BV2 microglia, and to identify its molecular targets of anti-neuroinflammatory action.Methods: BV2 cells were stimulated with LPS + IFNγ in the presence or absence of tiliroside. TNFα, IL-6, nitrite and PGE2production was determined with ELISA, Griess assay and enzyme immunoassay, respectively. iNOS, COX-2, phospho-p65, phospho-IκBα, phospho-IKKα, phospho-p38, phospho-MK2, phosopho-MKK3/6 and TRAF-6 were determined by western blot analysis. NF-κB activity was also investigated using a reporter gene assay in HEK293 cells. LPS-induced microglia ROS production was tested using the DCFDA method, while HO-1 and Nrf2 activation was determined with western blot.Results: Tiliroside significantly suppressed TNFα, IL-6, nitrite and PGE2production, as well as iNOS and COX-2 protein expression from LPS + IFNγ-activated BV2 microglia. Further mechanistic studies showed that tiliroside inhibited neuroinflammation by targeting important steps in the NF-κB and p38 signalling in LPS + IFNγ-activated BV2 cells. This compound also inhibited LPS-induced TRAF-6 protein expression in BV2 cells. Antioxidant activity of tiliroside in BV2 cells was demonstrated through attenuation of LPS + IFNγ-induced ROS production and activation of HO-1/Nrf2 antioxidant system.Conclusions: Tiliroside inhibits neuroinflammation in BV2 microglia through a mechanism involving TRAF-6-mediated activation of NF-κB and p38 MAPK signalling pathways. These activities are possibly due, in part, to the antioxidant property of this compound.General Significance: Tiliroside is a potential novel natural compound for inhibiting neuroinflammation in neurodegenerative disorders.
KW - Antioxidant
KW - Neuroinflammation
KW - NF-κB p38
KW - Tiliroside
KW - TRAF-6
UR - http://www.scopus.com/inward/record.url?scp=84907096973&partnerID=8YFLogxK
U2 - 10.1016/j.bbagen.2014.08.008
DO - 10.1016/j.bbagen.2014.08.008
M3 - Article
VL - 1840
SP - 3311
EP - 3319
JO - Biochimica et Biophysica Acta - General Subjects
JF - Biochimica et Biophysica Acta - General Subjects
SN - 0006-3002
IS - 12
ER -