Search
Check Out Our Sponsors
Latest topics
Up-regulation of Nrf2-mediated heme oxygenase-1 expression by eckol, a phlorotannin compound, through activation of Erk and PI3K/Akt.
Page 1 of 1
Up-regulation of Nrf2-mediated heme oxygenase-1 expression by eckol, a phlorotannin compound, through activation of Erk and PI3K/Akt.
Int J Biochem Cell Biol. 2009 Nov 18.
Up-regulation of Nrf2-mediated heme oxygenase-1 expression by eckol, a phlorotannin compound, through activation of Erk and PI3K/Akt.
Kim KC, Kang KA, Zhang R, Piao MJ, Kim GY, Kang MY, Lee SJ, Lee NH, Surh YJ, Hyun JW.
School of Applied Marine Science, Jeju National University, Jeju-si 690-756, South Korea.
The aim of the present study was to examine the cytoprotective effect of eckol, a phlorotannin found in Ecklonia cava and to elucidate underlying mechanisms. Heme oxygenase-1 (HO-1) is an important antioxidant enzyme that plays a role in cytoprotection against oxidative stress. Eckol-induced HO-1 expression both at the level of mRNA and protein in Chinese hamster lung fibroblast (V79-4) cells, resulting in increased HO-1 activity. The transcription factor NF-E2-related factor 2 (Nrf2) is a critical regulator of HO-1, achieved by binding to the antioxidant response element (ARE). Eckol treatment resulted in the enhanced level of phosphorylated form, nuclear translocation, ARE-binding, and transcriptional activity of Nrf2. Extracellular regulated kinase (Erk) and phosphatidylinositol 3-kinase (PI3K)/protein kinase B (PKB, Akt) contributed to ARE-driven HO-1 expression. Eckol activated both Erk and Akt, and treatments with U0126 (an Erk kinase inhibitor), LY294002 (a PI3K inhibitor), specific Erk1 siRNA, and Akt siRNA suppressed the eckol-induced activation of Nrf2, resulting in a decrease in HO-1 expression. ZnPP (a HO-1 inhibitor), HO-1 siRNA, and Nrf2 siRNA markedly abolished the cytoprotective effect of eckol against hydrogen peroxide-induced cell damage. Likewise, U0126 and LY294002 inhibited the eckol-induced cytoprotective effect against oxidative cell damage. These studies demonstrate that eckol attenuates oxidative stress by activating Nrf2-mediated HO-1 induction via Erk and PI3K/Akt signaling. Copyright 2009 Elsevier Ltd. All rights reserved.
Up-regulation of Nrf2-mediated heme oxygenase-1 expression by eckol, a phlorotannin compound, through activation of Erk and PI3K/Akt.
Kim KC, Kang KA, Zhang R, Piao MJ, Kim GY, Kang MY, Lee SJ, Lee NH, Surh YJ, Hyun JW.
School of Applied Marine Science, Jeju National University, Jeju-si 690-756, South Korea.
The aim of the present study was to examine the cytoprotective effect of eckol, a phlorotannin found in Ecklonia cava and to elucidate underlying mechanisms. Heme oxygenase-1 (HO-1) is an important antioxidant enzyme that plays a role in cytoprotection against oxidative stress. Eckol-induced HO-1 expression both at the level of mRNA and protein in Chinese hamster lung fibroblast (V79-4) cells, resulting in increased HO-1 activity. The transcription factor NF-E2-related factor 2 (Nrf2) is a critical regulator of HO-1, achieved by binding to the antioxidant response element (ARE). Eckol treatment resulted in the enhanced level of phosphorylated form, nuclear translocation, ARE-binding, and transcriptional activity of Nrf2. Extracellular regulated kinase (Erk) and phosphatidylinositol 3-kinase (PI3K)/protein kinase B (PKB, Akt) contributed to ARE-driven HO-1 expression. Eckol activated both Erk and Akt, and treatments with U0126 (an Erk kinase inhibitor), LY294002 (a PI3K inhibitor), specific Erk1 siRNA, and Akt siRNA suppressed the eckol-induced activation of Nrf2, resulting in a decrease in HO-1 expression. ZnPP (a HO-1 inhibitor), HO-1 siRNA, and Nrf2 siRNA markedly abolished the cytoprotective effect of eckol against hydrogen peroxide-induced cell damage. Likewise, U0126 and LY294002 inhibited the eckol-induced cytoprotective effect against oxidative cell damage. These studies demonstrate that eckol attenuates oxidative stress by activating Nrf2-mediated HO-1 induction via Erk and PI3K/Akt signaling. Copyright 2009 Elsevier Ltd. All rights reserved.
_________________
My regimen
http://www.immortalhair.org/mpb-regimen
Now available for consultation (hair and/or health)
http://www.immortalhair.org/health-consultation
Similar topics
» Sulforaphane and {alpha}-Lipoic Acid Upregulate the Expression of the {pi} Class of Glutathione S-Transferase through c-Jun and Nrf2 Activation.
» Heme oxygenase-1 in neovascularisation: A diabetic perspective
» A novel control of human keratin expression: cannabinoid receptor 1-mediated signaling down-regulates the expression of keratins K6 and K16 in human keratinocytes in vitro and in situ
» Resveratrol-mediated glycemic regulation is blunted by curcumin and is associated to modulation of gut microbiota
» Paracrine TGF-β Signaling Counterbalances BMP-Mediated Repression in Hair Follicle Stem Cell Activation
» Heme oxygenase-1 in neovascularisation: A diabetic perspective
» A novel control of human keratin expression: cannabinoid receptor 1-mediated signaling down-regulates the expression of keratins K6 and K16 in human keratinocytes in vitro and in situ
» Resveratrol-mediated glycemic regulation is blunted by curcumin and is associated to modulation of gut microbiota
» Paracrine TGF-β Signaling Counterbalances BMP-Mediated Repression in Hair Follicle Stem Cell Activation
Page 1 of 1
Permissions in this forum:
You cannot reply to topics in this forum
Today at 11:16 am by CausticSymmetry
» zombie cells
Sat May 11, 2024 6:54 am by CausticSymmetry
» Sandalore - could it be a game changer?
Wed May 08, 2024 9:45 pm by MikeGore
» *The first scientific evidence in 2021 that viruses do not exist*
Tue May 07, 2024 4:18 am by CausticSymmetry
» China is at it again
Tue May 07, 2024 4:07 am by CausticSymmetry
» Ways to increase adult stem cells
Mon May 06, 2024 5:40 pm by el_llama
» pentadecanoic acid
Sun May 05, 2024 10:56 am by CausticSymmetry
» Exosome Theory and Herpes
Fri May 03, 2024 3:25 am by CausticSymmetry
» Road to recovery - my own log of everything I'm currently trying for HL
Tue Apr 30, 2024 1:55 pm by JtheDreamer