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Wahyudi, Lilik Duwi,Jeong, Jiwon,Yang, Heejung,Kim, Jung-Hwan Elsevier 2018 The international journal of biochemistry & cell b Vol.99 No.-
<P><B>Abstract</B></P> <P>Nuclear factor erythroid 2-related factor 2 (Nrf2) is a key transcription factor that responds to oxidative stress and xenobiotics. Multiple lines of evidence suggest that Nrf2 activation protects against aging, inflammation, and many diseases, including cancer. Nrf2 activators derived from natural sources have been widely studied. In this study, we investigated the effect of amentoflavone (AFN), a biflavonoid found in many plants, on Nrf2 signaling in human keratinocytes (HaCaT cells). AFN significantly increased ARE luciferase activity by Nrf2 accumulation in the nucleus. Subsequently, the levels of a Nrf2 target protein, NQO-1, were significantly increased by AFN in a dose- and time-dependent manner. To verify the mechanism of AFN-induced activation of Nrf2 signaling, we measured generation of reactive oxygen species (ROS). Interestingly AFN triggered mild ROS production. Additionally, AFN-induced Nrf2 activation was inhibited by N-acetyl cysteine. Therefore, we studied the effect of ROS-related signaling on Nrf2 by measuring the activation of AKT and members of the mitogen-activated protein kinase family, such as extracellular signal-regulated kinase (ERK1/2) and p38. The results showed that the pharmacological inhibitor of PI3K/AKT (LY294002) or p38 (SB 203580), but not ERK1/2 (U0126), abrogated AFN-induced Nrf2 activation. Subsequently, we found that silencing or inhibition of p38 resulted in decrease of AKT phosphorylation as well as inhibition of Nrf2 accumulation. Furthermore, we found that AFN stabilized Nrf2 by inhibiting its ubiquitination. Taken together, our results suggest that AFN contributes to Nrf2 activation through ROS-mediated activation of the p38-AKT pathway in HaCaT cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Amentoflavone induces Nrf2 activation in HaCaT cells. </LI> <LI> The Nrf2 was activated by ROS-p38 MAP kinase-AKT pathways. </LI> <LI> Amentoflavone stabilizes the Nrf2 by inhibition of ubiquitination. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Poster Session : Characterization of DJ-1 Like gene in arabidopsis
( Wahyu Indra Duwi Fanata ),( Min Hee Jung ),( Joon Yung Cha ),( Netty Ermawati ),( Ying Shi Liang ),( Mukhamad Su`udi ),( Sun Ping ),( Sun Shin Cha ),( Kon Ho Lee ),( Dae Young Son ) 한국생화학분자생물학회 (구 한국생화학회) 2006 생화학분자생물학회 춘계학술발표논문집 Vol.2006 No.-
( Taehyeong Kim ),( Lilik Duwi Wahyudi ),( Frank J. Gonzalez ),( Jung-hwan Kim ) 한국응용약물학회 2017 Biomolecules & Therapeutics(구 응용약물학회지) Vol.25 No.5
Inhibitor of nuclear factor kappa-B kinase beta (IKKβ) plays a critical role in cell proliferation and inflammation in various cells by activating NF-κB signaling. However, the interrelationship between peroxisome proliferator-activated receptor α (PPARα) and IKKβ in cell proliferation is not clear. In this study, we investigated the possible role of PPARα in the hepatic cell death in the absence of IKKβ gene using liver-specific Ikkb-null (Ikkb<sup>F/F-AlbCre</sup>) mice. To examine the function of PPARα activation in hepatic cell death, wild-type (Ikkb<sup>F/F</sup>) and Ikkb<sup>F/F-AlbCre</sup> mice were treated with PPARα agonist Wy-14,643 (0.1% w/w chow diet) for two weeks. As a result of Wy-14,643 treatment, apoptotic markers including caspase-3 cleavage, poly (ADP-ribose) polymerase (PARP) cleavage and TUNEL-positive staining were significantly decreased in the Ikkb<sup>F/F-AlbCre</sup> mice. Surprisingly, Wy-14,643 increased the phosphorylation of p65 and STAT3 in both Ikkb and Ikkb<sup>F/F-AlbCre</sup> mice. Furthermore, BrdU-positive cells were significantly increased in both groups after treatment with Wy-14,643. Our results suggested that IKKβ-derived hepatic apoptosis could be altered by PPARα activation in conjunction with activation of NF-κB and STAT3 signaling.
Kim, Taehyeong,Wahyudi, Lilik Duwi,Gonzalez, Frank J.,Kim, Jung-Hwan The Korean Society of Applied Pharmacology 2017 Biomolecules & Therapeutics(구 응용약물학회지) Vol.25 No.5
Inhibitor of nuclear factor kappa-B kinase beta ($IKK{\beta}$) plays a critical role in cell proliferation and inflammation in various cells by activating $NF-{\kappa}B$ signaling. However, the interrelationship between peroxisome proliferator-activated receptor ${\alpha}$ ($PPAR{\alpha}$) and $IKK{\beta}$ in cell proliferation is not clear. In this study, we investigated the possible role of $PPAR{\alpha}$ in the hepatic cell death in the absence of $IKK{\beta}$ gene using liver-specific Ikkb-null ($Ikkb^{F/F-AlbCre}$) mice. To examine the function of $PPAR{\alpha}$ activation in hepatic cell death, wild-type ($Ikkb^{F/F}$) and $Ikkb^{F/F-AlbCre}$ mice were treated with $PPAR{\alpha}$ agonist Wy-14,643 (0.1% w/w chow diet) for two weeks. As a result of Wy-14,643 treatment, apoptotic markers including caspase-3 cleavage, poly (ADP-ribose) polymerase (PARP) cleavage and TUNEL-positive staining were significantly decreased in the $Ikkb^{F/F-AlbCre}$ mice. Surprisingly, Wy-14,643 increased the phosphorylation of p65 and STAT3 in both Ikkb and $Ikkb^{F/F-AlbCre}$ mice. Furthermore, BrdU-positive cells were significantly increased in both groups after treatment with Wy-14,643. Our results suggested that $IKK{\beta}-derived$ hepatic apoptosis could be altered by $PPAR{\alpha}$ activation in conjunction with activation of $NF-{\kappa}B$ and STAT3 signaling.
RNA-Dependent RNA Polymerase 6 Is Required for Efficient hpRNA-Induced Gene Silencing in Plants
RIKNOHARMOKO,이균오,Wahyu Indra Duwi Fanata,유재용,고기성,임영길,엠다나짐우단,Tri Agus Siswoyo,이승식,김둘이,이상열 한국분자세포생물학회 2013 Molecules and cells Vol.35 No.3
In plants, transgenes with inverted repeats are used to in-duce efficient RNA silencing, which is also frequently induced by highly transcribed sense transgenes. RNA silencing induced by sense transgenes is dependent on RNA-dependent RNA polymerase 6 (RDR6), which con-verts single-stranded (ss) RNA into double-stranded (ds) RNA. By contrast, it has been proposed that RNA silencing induced by self-complementary hairpin RNA (hpRNA) does not require RDR6, because the hpRNA can directly fold back on itself to form dsRNA. However, it is unclear whether RDR6 plays a role in hpRNA-induced RNA silencing by amplifying dsRNA to spread RNA silencing within the plant. To address the efficiency of hpRNA-induced RNA silencing in the presence or absence of RDR6, Wild type (WT, Col-0) and rdr6-11 Arabidopsis thaliana lines expressing green fluorescent protein (GFP) were generated and transformed with a GFP-RNA interference (RNAi) construct. Whereas most GFP-RNAi-transformed WT lines exhibited almost complete silencing of GFP expression in the T1 generation, various levels of GFP expression remained among the GFP-RNAi-transformed rdr6-11 lines. Homozygous expression of GFP-RNAi in the T3 generation was not sufficient to induce complete GFP silencing in several rdr6-11 lines. Our results indicate that RDR6 is required for efficient hpRNA-induced RNA silencing in plants.
Callus Induction and Regeneration from Anther Cultures of Indonesian Indica Black Rice Cultivar
Anisa Maharani,Wahyu Indra Duwi Fanata,Faida Nur Laeli,김경민,Tri Handoyo 한국작물학회 2020 Journal of crop science and biotechnology Vol.23 No.1
The assembly of superior varieties and collection of rice germplasm involves the process of selecting and storing elders that have superior genotypic properties and phenotypes. The anther culture techniques on indica black rice cultivar have a high difficulty factor to get plants, because of the low regeneration ability at the plant formation phase from the anther callus. This study aimed to investigate the influence of the cold-pretreatment time on anther, the combination of plant growth regulators (PGR’s) concentrations, and putrescine concentrations in media for the increase callus induction and plant regeneration of indica black rice. The optimization of the cold pre-treatment time was important to obtain the high-frequency callus induction, which showed that anther at the 4°C for 8 days formed the high callus induction (20%). To accelerate the callus induction, the application of 20 µM putrescine in the MS medium could produce more friable embryogenic callus for 24 days with 27% of callus formation. Generally, the optimal medium for the high frequency of callus induction contained 2 mgL-1 NAA+0.5 mgL-1 Kinetin+20 µM putrescine. Especially indica black rice cultivars, the best media to get a high plant regeneration frequency were N6 media containing the combination of 2 mgL-1 IAA and 2,5 mgL-1 Kinetin. The total callus regenerated to plantlet about 12.5%. The study of the callus induction and in-vitro plant regeneration medium for indica black rice were still important to develop to get the best result for other cultivars.
RNA-dependent RNA polymerase 6 is required for efficient hpRNA-induced gene silencing in plants
Harmoko, Rikno,Fanata, Wahyu Indra Duwi,Yoo, Jae Yong,Ko, Ki Seong,Rim, Yeong Gil,Uddin, Mohammad Nazim,Siswoyo, Tri Agus,Lee, Seung Sik,Kim, Dool Yi,Lee, Sang Yeol,Lee, Kyun Oh Springer-Verlag 2013 Molecules and cells Vol.35 No.3