Alaria esculenta Extract Protects against Oxidative Damage by Inducing Heme Oxygenase-1 Expression via Akt and Nrf2

  • Choi, Chun-Yeon (Department of Biochemistry, College of Medicine, Inje University) ;
  • Jo, Guk-Heui (Department of Biochemistry, College of Medicine, Inje University) ;
  • Lee, Jung-Im (Division of Marine Environment and Bioscience, Korea Maritime University) ;
  • Seo, Young-Wan (Division of Marine Environment and Bioscience, Korea Maritime University) ;
  • Han, Tae-Jun (Department of Biology, University of Incheon) ;
  • Choi, Il-Whan (Department of Microbiology, College of Medicine, Inje University) ;
  • Liu, Kwang-Hyeon (Department of Pharmacology, College of Medicine, Inje University) ;
  • Oh, Sang-Taek (Department of Pharmacology, College of Medicine, Inje University) ;
  • Kim, Dong-Eun (Division of Bioscience and Biotechnology, Konkuk University) ;
  • Jang, Won-Hee (Department of Biochemistry, College of Medicine, Inje University) ;
  • Seog, Dae-Hyun (Department of Biochemistry, College of Medicine, Inje University) ;
  • Park, Yeong-Hong (Department of Biochemistry, College of Medicine, Inje University) ;
  • Yea, Sung-Su (Department of Biochemistry, College of Medicine, Inje University)
  • Published : 2009.06.30

Abstract

Alaria esculenta is a brown seaweed found in the Arctic. This study investigated the protective effect of A. esculenta extract (AEE) against oxidant-mediated injury and its mode of action in RAW264.7 macrophages. The methyl thiazolyl tetrazolium (MTT) assay showed that $H_2O_2$ treatment reduced cell viability, whereas AEE protected cells from $H_2O_2$-mediated cytotoxicity in a dose-dependent manner. Because heme oxygenase-1 (HO-1) is known to protect cells against oxidative damage, we investigated the effect of AEE on HO-1 gene expression and HO enzyme activity. The protective effect of AEE against $H_2O_2$-induced injury was correlated with increased HO enzyme activity. AEE also induced HO-1 mRNA and protein expression, as determined RT-PCR and Western blotting, respectively. To characterize the mechanisms by which AEE induces HO-1 gene expression, we examined the effect of AEE on the nuclear translocation of NF-E2-related factor-2 (Nrf2) and Akt phosphorylation. AEE treatment activated upstream signaling for HO-1 gene expression, including the nuclear translocation of Nrf2 and Akt phosphorylation. Collectively, these results suggest that AEE has anti-oxidant activity that is mediated, at least in part, via the activation of Nrf2 and Akt and the subsequent induction of HO-1 gene expression.

Keywords

References

  1. Griendling, K. K., Sorescu, D., Lassegue, B. & Ushio-Fukai, M. Modulation of protein kinase activity and gene expression by reactive oxygen species and their role in vascular physiology and pathophysiology. Arterioscler Thromb Vasc Biol 20:2175-2183 (2000) https://doi.org/10.1161/01.ATV.20.10.2175
  2. Hensley, K., Robinson, K. A., Gabbita, S. P., Salsman, S. & Floyd, R. A. Reactive oxygen species, cell signaling, and cell injury. Free Radic Biol Med 28:1456-1462 (2000) https://doi.org/10.1016/S0891-5849(00)00252-5
  3. Cooke, M. S., Evans, M. D., Dizdaroglu, M. & Lunec, J. Oxidative DNA damage: mechanisms, mutation, and disease. FASEB J 17:1195-1214 (2003) https://doi.org/10.1096/fj.02-0752rev
  4. Otterbein, L. E. & Choi, A. M. Heme oxygenase: colors of defense against cellular stress. Am J Physiol Lung Cell Mol Physiol 279:L1029-1037 (2000)
  5. Clark, J. E., Foresti, R., Green, C. J. & Motterlini, R. Dynamics of haem oxygenase-1 expression and bilirubin production in cellular protection against oxidative stress. Biochem J 348 Pt 3:615-619 (2000) https://doi.org/10.1042/0264-6021:3480615
  6. Morse, D. & Choi, A. M. Heme oxygenase-1: the 'emerging molecule' has arrived. Am J Respir Cell Mol Biol 27:8-16 (2002) https://doi.org/10.1165/ajrcmb.27.1.4862
  7. Nguyen, T., Sherratt, P. J. & Pickett, C. B. Regulatory mechanisms controlling gene expression mediated by the antioxidant response element. Annu Rev Pharmacol Toxicol 43:233-260 (2003) https://doi.org/10.1146/annurev.pharmtox.43.100901.140229
  8. Martin, D. et al. Regulation of heme oxygenase-1 expression through the phosphatidylinositol 3-kinase/Akt pathway and the Nrf2 transcription factor in response to the antioxidant phytochemical carnosol. J Biol Chem 279:8919-8929 (2004) https://doi.org/10.1074/jbc.M309660200
  9. Indergaard, M. & Minsaas, J. Animal and Human Nutrition. In Seaweed Resources in Europe (eds. Guiry, M.D. & Blunden, G.) pp. 21-64 (John Wiley & Sons, 1991)
  10. Itoh, K. et al. Keap1 represses nuclear activation of antioxidant responsive elements by Nrf2 through binding to the amino-terminal Neh2 domain. Genes Dev 13:76-86 (1999) https://doi.org/10.1101/gad.13.1.76
  11. Na, H. K. et al. (-)-Epigallocatechin gallate induces Nrf2-mediated antioxidant enzyme expression via activation of PI3K and ERK in human mammary epithelial cells. Arch Biochem Biophys 476:171-177 (2008) https://doi.org/10.1016/j.abb.2008.04.003
  12. Lee, J. M., Hanson, J. M., Chu, W. A. & Johnson, J. A. Phosphatidylinositol 3-kinase, not extracellular signal-regulated kinase, regulates activation of the antioxidant-responsive element in IMR-32 human neuroblastoma cells. J Biol Chem 276:20011-20016 (2001) https://doi.org/10.1074/jbc.M100734200
  13. Soares, M. P. et al. Expression of heme oxygenase-1 can determine cardiac xenograft survival. Nat Med 4:1073-1077 (1998) https://doi.org/10.1038/2063
  14. Poss, K. D. & Tonegawa, S. Reduced stress defense in heme oxygenase 1-deficient cells. Proc Natl Acad Sci USA 94:10925-10930 (1997) https://doi.org/10.1073/pnas.94.20.10925
  15. Yachie, A. et al. Oxidative stress causes enhanced endothelial cell injury in human heme oxygenase-1 deficiency. J Clin Invest 103:129-135 (1999) https://doi.org/10.1172/JCI4165
  16. Hayes, J. D. et al. The Nrf2 transcription factor contributes both to the basal expression of glutathione Stransferases in mouse liver and to their induction by the chemopreventive synthetic antioxidants, butylated hydroxyanisole and ethoxyquin. Biochem Soc Trans 28:33-41 (2000)
  17. Salinas, M., Diaz, R., Abraham, N. G., Ruiz de Galarreta, C. M. & Cuadrado, A. Nerve growth factor protects against 6-hydroxydopamine-induced oxidative stress by increasing expression of heme oxygenase-1 in a phosphatidylinositol 3-kinase-dependent manner. J Biol Chem 278:13898-13904 (2003) https://doi.org/10.1074/jbc.M209164200
  18. Mosmann, T. Rapid colorimetric assay for cellular growth and survival: application to proliferation and cytotoxicity assays. J Immunol Methods 65:55-63 (1983) https://doi.org/10.1016/0022-1759(83)90303-4
  19. Pae, H. O. et al. Costunolide inhibits production of tumor necrosis factor-alpha and interleukin-6 by inducing heme oxygenase-1 in RAW264.7 macrophages. Inflamm Res 56:520-526 (2007) https://doi.org/10.1007/s00011-007-7015-4
  20. Dunnett, C. W. A multiple comparison procedure for comparing several treatments with a control. J Amer Stat Assoc 50:1096-1121 (1955) https://doi.org/10.2307/2281208