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Paeonia lactiflora Pall. protects against ANIT-induced cholestasis by activating Nrf2 via PI3K/Akt signaling pathway.

Ma X, Zhao YL, Zhu Y, Chen Z, Wang JB, Li RY, Chen C, Wei SZ, Li JY, Liu B, Wang RL, Li YG, Wang LF, Xiao XH - Drug Des Devel Ther (2015)

Bottom Line: Moreover, in order to illustrate the underlying signaling pathway, liver glutathione (GSH) content and mRNA or protein levels of glutamate-cysteine ligase catalytic subunit (GCLc), glutamate-cysteine ligase modulatory subunit (GCLm), Akt, heme oxygenase-1 (HO-1), NAD(P)H/quinone oxidoreductase 1 (Nqo1), and Nrf2 were further analyzed.It enhanced antioxidative system by activating PI3K/Akt/Nrf2 pathway through increasing Akt, Nrf2, HO-1, Nqo1, GCLc, and GCLm expression.The putative targets network validation also confirmed the important role of PLP in activating Akt expression.

View Article: PubMed Central - PubMed

Affiliation: Pharmacy College, Chengdu University of Traditional Chinese Medicine, Chengdu, People's Republic of China ; Department of Pharmacy, 302 Military Hospital of People's Liberation Army, Beijing, People's Republic of China.

ABSTRACT

Background: Paeonia lactiflora Pall. (PLP), a traditional Chinese herbal medicine, has been used for hepatic disease treatment over thousands of years. In our previous study, PLP was shown to demonstrate therapeutic effect on hepatitis with severe cholestasis. The aim of this study was to evaluate the antioxidative effect of PLP on alpha-naphthylisothiocyanate (ANIT)-induced cholestasis by activating NF-E2-related factor 2 (Nrf2) via phosphatidylinositol 3-kinase (PI3K)/Akt signaling pathway.

Materials and methods: Liquid chromatography-mass spectrometry (LC-MS) was performed to identify the main compounds present in PLP. The mechanism of action of PLP and its therapeutic effect on cholestasis, induced by ANIT, were further investigated. Serum indices such as total bilirubin (TBIL), direct bilirubin (DBIL), aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), γ-glutamyl transpeptidase (γ-GT), and total bile acid (TBA) were measured, and histopathology of liver was also performed to determine the efficacy of treatment with PLP. Moreover, in order to illustrate the underlying signaling pathway, liver glutathione (GSH) content and mRNA or protein levels of glutamate-cysteine ligase catalytic subunit (GCLc), glutamate-cysteine ligase modulatory subunit (GCLm), Akt, heme oxygenase-1 (HO-1), NAD(P)H/quinone oxidoreductase 1 (Nqo1), and Nrf2 were further analyzed. In addition, validation of PLP putative target network was also performed in silico.

Results: Four major compounds including paeoniflorin, albiflorin, oxypaeoniflorin, and benzoylpaeoniflorin were identified by LC-MS analysis in water extract of PLP. Moreover, PLP could remarkably downregulate serum levels of TBIL, DBIL, AST, ALT, ALP, γ-GT, and TBA, and alleviate the histological damage of liver tissue caused by ANIT. It enhanced antioxidative system by activating PI3K/Akt/Nrf2 pathway through increasing Akt, Nrf2, HO-1, Nqo1, GCLc, and GCLm expression. The putative targets network validation also confirmed the important role of PLP in activating Akt expression.

Conclusion: The potential mechanism of PLP in alleviating ANIT-induced cholestasis could to be related to the induction of GSH synthesis by activating Nrf2 through PI3K/Akt-dependent pathway. This indicates that PLP might be a potential therapeutic agent for cholestasis.

No MeSH data available.


Related in: MedlinePlus

GSH level and Western blot analysis of pAkt, GCLc, GCLm, and Nrf2.Notes: Rats were treated with different doses of PLP. (A) The Western blot images of pAkt, GCLc, GCLm, and Nrf2; (B) GSH levels in liver tissue. Data are expressed as mean ± SD. ##P<0.01 compared with control group; **P<0.01 compared with ANIT group.Abbreviations: PLP, Paeonia lactiflora Pall.; ANIT, alpha-naphthylisothiocyanate; UDCA, ursodeoxycholic acid; Nrf2, NF-E2-related factor 2; GSH, glutathione; GCLc, glutamate-cysteine ligase catalytic subunit; GCLm, glutamate-cysteine ligase modulatory subunit; SD, standard deviation.
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f5-dddt-9-5061: GSH level and Western blot analysis of pAkt, GCLc, GCLm, and Nrf2.Notes: Rats were treated with different doses of PLP. (A) The Western blot images of pAkt, GCLc, GCLm, and Nrf2; (B) GSH levels in liver tissue. Data are expressed as mean ± SD. ##P<0.01 compared with control group; **P<0.01 compared with ANIT group.Abbreviations: PLP, Paeonia lactiflora Pall.; ANIT, alpha-naphthylisothiocyanate; UDCA, ursodeoxycholic acid; Nrf2, NF-E2-related factor 2; GSH, glutathione; GCLc, glutamate-cysteine ligase catalytic subunit; GCLm, glutamate-cysteine ligase modulatory subunit; SD, standard deviation.

Mentions: To study the role of PLP in cholestasis, the oxidative stress related to PI3K/Akt/Nrf2 pathway was explored. Results indicate that ANIT decreased the protein expressions of GCLm, GCLc, pAkt, and Nrf2, whereas PLP at 80 g/kg and 40 g/kg doses could promote the protein levels of GCLm, GCLc, p-Akt, and Nrf2 (Figure 5A). Furthermore, exposure to ANIT markedly decreased GSH content compared with control, suggesting the reduction of antioxidation in hepatocytes. PLP at 80 g/kg and 40 g/kg could significantly restore GSH content compared with ANIT-treated rats (Figure 5B). However, PLP at 20 g/kg presented no obvious change in ANIT-induced depletion of GSH.


Paeonia lactiflora Pall. protects against ANIT-induced cholestasis by activating Nrf2 via PI3K/Akt signaling pathway.

Ma X, Zhao YL, Zhu Y, Chen Z, Wang JB, Li RY, Chen C, Wei SZ, Li JY, Liu B, Wang RL, Li YG, Wang LF, Xiao XH - Drug Des Devel Ther (2015)

GSH level and Western blot analysis of pAkt, GCLc, GCLm, and Nrf2.Notes: Rats were treated with different doses of PLP. (A) The Western blot images of pAkt, GCLc, GCLm, and Nrf2; (B) GSH levels in liver tissue. Data are expressed as mean ± SD. ##P<0.01 compared with control group; **P<0.01 compared with ANIT group.Abbreviations: PLP, Paeonia lactiflora Pall.; ANIT, alpha-naphthylisothiocyanate; UDCA, ursodeoxycholic acid; Nrf2, NF-E2-related factor 2; GSH, glutathione; GCLc, glutamate-cysteine ligase catalytic subunit; GCLm, glutamate-cysteine ligase modulatory subunit; SD, standard deviation.
© Copyright Policy
Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC4562737&req=5

f5-dddt-9-5061: GSH level and Western blot analysis of pAkt, GCLc, GCLm, and Nrf2.Notes: Rats were treated with different doses of PLP. (A) The Western blot images of pAkt, GCLc, GCLm, and Nrf2; (B) GSH levels in liver tissue. Data are expressed as mean ± SD. ##P<0.01 compared with control group; **P<0.01 compared with ANIT group.Abbreviations: PLP, Paeonia lactiflora Pall.; ANIT, alpha-naphthylisothiocyanate; UDCA, ursodeoxycholic acid; Nrf2, NF-E2-related factor 2; GSH, glutathione; GCLc, glutamate-cysteine ligase catalytic subunit; GCLm, glutamate-cysteine ligase modulatory subunit; SD, standard deviation.
Mentions: To study the role of PLP in cholestasis, the oxidative stress related to PI3K/Akt/Nrf2 pathway was explored. Results indicate that ANIT decreased the protein expressions of GCLm, GCLc, pAkt, and Nrf2, whereas PLP at 80 g/kg and 40 g/kg doses could promote the protein levels of GCLm, GCLc, p-Akt, and Nrf2 (Figure 5A). Furthermore, exposure to ANIT markedly decreased GSH content compared with control, suggesting the reduction of antioxidation in hepatocytes. PLP at 80 g/kg and 40 g/kg could significantly restore GSH content compared with ANIT-treated rats (Figure 5B). However, PLP at 20 g/kg presented no obvious change in ANIT-induced depletion of GSH.

Bottom Line: Moreover, in order to illustrate the underlying signaling pathway, liver glutathione (GSH) content and mRNA or protein levels of glutamate-cysteine ligase catalytic subunit (GCLc), glutamate-cysteine ligase modulatory subunit (GCLm), Akt, heme oxygenase-1 (HO-1), NAD(P)H/quinone oxidoreductase 1 (Nqo1), and Nrf2 were further analyzed.It enhanced antioxidative system by activating PI3K/Akt/Nrf2 pathway through increasing Akt, Nrf2, HO-1, Nqo1, GCLc, and GCLm expression.The putative targets network validation also confirmed the important role of PLP in activating Akt expression.

View Article: PubMed Central - PubMed

Affiliation: Pharmacy College, Chengdu University of Traditional Chinese Medicine, Chengdu, People's Republic of China ; Department of Pharmacy, 302 Military Hospital of People's Liberation Army, Beijing, People's Republic of China.

ABSTRACT

Background: Paeonia lactiflora Pall. (PLP), a traditional Chinese herbal medicine, has been used for hepatic disease treatment over thousands of years. In our previous study, PLP was shown to demonstrate therapeutic effect on hepatitis with severe cholestasis. The aim of this study was to evaluate the antioxidative effect of PLP on alpha-naphthylisothiocyanate (ANIT)-induced cholestasis by activating NF-E2-related factor 2 (Nrf2) via phosphatidylinositol 3-kinase (PI3K)/Akt signaling pathway.

Materials and methods: Liquid chromatography-mass spectrometry (LC-MS) was performed to identify the main compounds present in PLP. The mechanism of action of PLP and its therapeutic effect on cholestasis, induced by ANIT, were further investigated. Serum indices such as total bilirubin (TBIL), direct bilirubin (DBIL), aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), γ-glutamyl transpeptidase (γ-GT), and total bile acid (TBA) were measured, and histopathology of liver was also performed to determine the efficacy of treatment with PLP. Moreover, in order to illustrate the underlying signaling pathway, liver glutathione (GSH) content and mRNA or protein levels of glutamate-cysteine ligase catalytic subunit (GCLc), glutamate-cysteine ligase modulatory subunit (GCLm), Akt, heme oxygenase-1 (HO-1), NAD(P)H/quinone oxidoreductase 1 (Nqo1), and Nrf2 were further analyzed. In addition, validation of PLP putative target network was also performed in silico.

Results: Four major compounds including paeoniflorin, albiflorin, oxypaeoniflorin, and benzoylpaeoniflorin were identified by LC-MS analysis in water extract of PLP. Moreover, PLP could remarkably downregulate serum levels of TBIL, DBIL, AST, ALT, ALP, γ-GT, and TBA, and alleviate the histological damage of liver tissue caused by ANIT. It enhanced antioxidative system by activating PI3K/Akt/Nrf2 pathway through increasing Akt, Nrf2, HO-1, Nqo1, GCLc, and GCLm expression. The putative targets network validation also confirmed the important role of PLP in activating Akt expression.

Conclusion: The potential mechanism of PLP in alleviating ANIT-induced cholestasis could to be related to the induction of GSH synthesis by activating Nrf2 through PI3K/Akt-dependent pathway. This indicates that PLP might be a potential therapeutic agent for cholestasis.

No MeSH data available.


Related in: MedlinePlus