Abstract
Pruni Cortex is a herbal drug from the bark of the Japanese flowering cherries, Prunus jamasakura or Prunus verecunda, and is included in the traditional Japanese herbal (Kampo) formula Jumihaidokuto, which is administered orally to patients suffering from inflammatory skin diseases. The flavanones contained in Pruni Cortex (e.g., sakuranetin and naringenin) have potent anti-inflammatory, anti-allergic, and anti-microbial activities. Although the effects of Pruni Cortex on skin disease have been well studied, reports regarding its pharmacological effects on the liver are limited. In this study, we extracted the bark of Prunus jamasakura and purified it to isolate the pharmacologically active constituents by monitoring nitric oxide (NO) production in rat hepatocytes that were treated with the pro-inflammatory cytokine, interleukin (IL)-1β. Sakuranetin and (−)-naringenin, which were present in an ethyl acetate-soluble fraction of the bark extract, significantly inhibited NO induction and inducible nitric oxide synthase (iNOS) expression. These two flavanones decreased the expression of type 1 IL-1 receptor gene and phosphorylation of Akt, also known as protein kinase B, which is regulated by phosphatidylinositol-4,5-bisphosphate 3-kinase (PI3K). Furthermore, sakuranetin decreased the phosphorylation of the activator isoforms of CCAAT/enhancer-binding protein β (C/EBPβ), which synergistically activates the transcription of the iNOS gene with nuclear factor κB (NF-κB). Therefore, sakuranetin inhibited the co-activating activity of C/EBPβ with NF-κB, leading to the suppression of iNOS gene expression in hepatocytes. Taken together, sakuranetin in Pruni Cortex downregulated the iNOS gene by inhibiting PI3K/Akt signal transduction and the phosphorylation of C/EBPβ. These results imply that sakuranetin may be primarily responsible for the anti-inflammatory effects of Pruni Cortex in the liver.
Similar content being viewed by others
Abbreviations
- PI3K:
-
Phosphatidylinositol-3-kinase
- NF-κB:
-
Nuclear factor-κB
- C/EBPβ:
-
CCAAT/enhancer-binding protein β
- NO:
-
Nitric oxide
- IL:
-
Interleukin
- iNOS:
-
Inducible nitric oxide synthase
- IL1R1:
-
Interleukin 1 receptor, type 1
- NMR:
-
Nuclear magnetic resonance
- qRT-PCR:
-
Quantitative reverse transcription–polymerase chain reaction
- EF:
-
Elongation factor 1α
- AABS:
-
A activator-binding site
- CMV:
-
Cytomegalovirus
- PC:
-
Pruni Cortex
- asRNA:
-
Antisense transcript
- LAP:
-
Liver-enriched activator protein
References
The Committee on the Japanese Pharmacopoeia (2016) The Japanese pharmacopoeia, 17th edn. The Minister of Health, Labour and Welfare, Japan
Tohno H, Horii C, Fuse T, Okonogi A, Yomoda S (2010) Evaluation of estrogen receptor beta binding of pruni cortex and its constituents. Yakugaku Zasshi 130:989–997
Izuo M (2004) Medical history: Seishu Hanaoka and his success in breast cancer surgery under general anesthesia two hundred years ago. Breast Cancer 11:319–324
Mizawa M, Makino T, Inami C, Shimizu T (2016) Jumihaidokuto (Shi-Wei-Ba-Du-Tang), a Kampo formula, decreases the disease activity of palmoplantar pustulosis. Dermatol Res Pract 2016:4060673
Matsuoka N, Ikeda T, El-Aasr M, Manabe H, Murakami Y, Deguchi H, Nohara T (2011) Study of the chemical constituents of Pruni cortex and its related parts. J Nat Med 65:166–171
Shimizu T, Lin F, Hasegawa M, Okada K, Nojiri H, Yamane H (2012) Purification and identification of naringenin 7-O-methyltransferase, a key enzyme in biosynthesis of flavonoid phytoalexin sakuranetin in rice. J Biol Chem 287:19315–19325
Watanabe K, Karuppagounder V, Arumugam S, Thandavarayan RA, Pitchaimani V, Sreedhar R, Afrin R, Harima M, Suzuki H, Suzuki K, Nakamura T, Nomoto M, Miyashita S, Fukumoto K, Ueno K (2015) Pruni cortex ameliorates skin inflammation possibly through HMGB1–NF-κB pathway in house dust mite induced atopic dermatitis NC/Nga transgenic mice. J Clin Biochem Nutr 56:186–194
Drira R, Sakamoto K (2016) Sakuranetin induces melanogenesis in B16BL6 melanoma cells through inhibition of ERK and PI3K/AKT signaling pathways. Phytother Res 30:997–1002
Toledo AC, Sakoda CP, Perini A, Pinheiro NM, Magalhães RM, Grecco S, Tibério IF, Câmara NO, Martins MA, Lago JH, Prado CM (2013) Flavonone treatment reverses airway inflammation and remodelling in an asthma murine model. Br J Pharmacol 168:1736–1749
Lawrence T (2009) The nuclear factor NF-κB pathway in inflammation. Cold Spring Harb Perspect Biol 1:a001651
Tsukada J, Yoshida Y, Kominato Y, Auron PE (2011) The CCAAT/enhancer (C/EBP) family of basic-leucine zipper (bZIP) transcription factors is a multifaceted highly-regulated system for gene regulation. Cytokine 54:6–19
Colasanti M, Suzuki H (2000) The dual personality of NO. Trends Pharmacol Sci 21:249–252
Kitade H, Sakitani K, Inoue K, Masu Y, Kawada N, Hiramatsu Y, Kamiyama Y, Okumura T, Ito S (1996) Interleukin 1β markedly stimulates nitric oxide formation in the absence of other cytokines or lipopolysaccharide in primary cultured rat hepatocytes but not in Kupffer cells. Hepatology 23:797–802
Teshima S, Nakanishi H, Nishizawa M, Kitagawa K, Kaibori M, Yamada M, Habara K, Kwon AH, Kamiyama Y, Ito S, Okumura T (2004) Up-regulation of IL-1 receptor through PI3K/Akt is essential for the induction of iNOS gene expression in hepatocytes. J Hepatol 40:616–623
Inaba H, Yoshigai E, Okuyama T, Murakoshi M, Sugiyama K, Nishino H, Nishizawa M (2015) Antipyretic analgesic drugs have different mechanisms for regulation of the expression of inducible nitric oxide synthase in hepatocytes and macrophages. Nitric Oxide 44:61–70
Miki H, Tokuhara K, Oishi M, Nakatake R, Tanaka Y, Kaibori M, Nishizawa M, Okumura T, Kon M (2016) Japanese Kampo Saireito has a liver-protective effect through the inhibition of inducible nitric oxide synthase induction in primary cultured rat hepatocytes. JPEN J Parenter Enteral Nutr 40:1033–1041
Yoshigai E, Machida T, Okuyama T, Mori M, Murase H, Yamanishi R, Okumura T, Ikeya Y, Nishino H, Nishizawa M (2013) Citrus nobiletin suppresses inducible nitric oxide synthase gene expression in interleukin-1β-treated hepatocytes. Biochem Biophys Res Commun 439:54–59
Takimoto Y, Qian HY, Yoshigai E, Okumura T, Ikeya Y, Nishizawa M (2013) Gomisin N in the herbal drug gomishi (Schisandra chinensis) suppresses inducible nitric oxide synthase gene via C/EBPβ and NF-κB in rat hepatocytes. Nitric Oxide 28:47–56
Fujii A, Okuyama T, Wakame K, Okumura T, Ikeya Y, Nishizawa M (2017) Identification of anti-inflammatory constituents in Phellodendri Cortex and Coptidis Rhizoma by monitoring the suppression of nitric oxide production. J Nat Med 71:745–756
Vasconcelos JMJ, Silva AMS, Cavaleiro JAS (1998) Chromones and flavanones from Artemisia campestris subsp. maritima. Phytochemistry 49:1421–1424
Jeon SH, Chun W, Choi YJ, Kwon YS (2008) Cytotoxic constituents from the bark of Salix hulteni. Arch Pharm Res 31:978–982
Kanemaki T, Kitade H, Hiramatsu Y, Kamiyama Y, Okumura T (1993) Stimulation of glycogen degradation by prostaglandin E2 in primary cultured rat hepatocytes. Prostaglandins 45:459–474
Tanemoto R, Okuyama T, Matsuo H, Okumura T, Ikeya Y, Nishizawa M (2015) The constituents of licorice (Glycyrrhiza uralensis) differentially suppress nitric oxide production in interleukin-1β-treated hepatocytes. Biochem Biophys Rep 2:153–159. https://doi.org/10.1016/j.bbrep.2015.06.004
Matsui K, Nishizawa M, Ozaki T, Kimura T, Hashimoto I, Yamada M, Kaibori M, Kamiyama Y, Ito S, Okumura T (2008) Natural antisense transcript stabilizes inducible nitric oxide synthase messenger RNA in rat hepatocytes. Hepatology 47:686–697
Sakitani K, Nishizawa M, Inoue K, Masu Y, Okumura T, Ito S (1998) Synergistic regulation of inducible nitric oxide synthase gene by CCAAT/enhancer-binding protein β and nuclear factor-κB in hepatocytes. Genes Cells 3:321–330
Nishizawa M, Okumura T, Ikeya Y, Kimura T (2012) Regulation of inducible gene expression by natural antisense transcripts. Front Biosci (Landmark Ed.) 17:938–958
Kleinert H, Pautz A, Linker K, Schwarz PM (2004) Regulation of the expression of inducible nitric oxide synthase. Eur J Pharmacol 500:255–266
Buss H, Dörrie A, Schmitz ML, Hoffmann E, Resch K, Kracht M (2004) Constitutive and interleukin-1-inducible phosphorylation of p65 NF-κB at serine 536 is mediated by multiple protein kinases including IκB kinase (IKK)-α, IKKβ, IKKε, TRAF family member-associated (TANK)-binding kinase 1 (TBK1), and an unknown kinase and couples p65 to TATA-binding protein-associated factor II31-mediated interleukin-8 transcription. J Biol Chem 279:55633–55643
Perkins ND (2006) Post-translational modifications regulating the activity and function of the nuclear factor kappa B pathway. Oncogene 25:6717–6730
Tsuchihashi R, Kodera M, Sakamoto S, Nakajima Y, Yamazaki T, Niiho Y, Nohara T, Kinjo J (2009) Microbial transformation and bioactivation of isoflavones from Pueraria flowers by human intestinal bacterial strains. J Nat Med 63:254–260
Ververidis F, Trantas E, Douglas C, Vollmer G, Kretzschmar G, Panopoulos N (2007) Biotechnology of flavonoids and other phenylpropanoid-derived natural products. Part I: chemical diversity, impacts on plant biology and human health. Biotechnol J 2:1214–1234
Nakajima A, Yamamoto Y, Yoshinaka N, Namba M, Matsuo H, Okuyama T, Yoshigai E, Okumura T, Nishizawa M, Ikeya Y (2015) A new flavanone and other flavonoids from green perilla leaf extract inhibit nitric oxide production in interleukin 1β-treated hepatocytes. Biosci Biotechnol Biochem 79:138–146
Bai D, Ueno L, Vogt PK (2009) Akt-mediated regulation of NFκB and the essentialness of NFκB for the oncogenicity of PI3 K and Akt. Int J Cancer 125:2863–2870
Yamanishi R, Yoshigai E, Okuyama T, Mori T, Murase H, Machida T, Okumura T, Nishizawa M (2014) The anti-inflammatory effects of flavanol-rich lychee fruit extract in rat hepatocytes. PLoS One 9:e93818
Kim KY, Kang H (2016) Sakuranetin inhibits inflammatory enzyme, cytokine, and costimulatory molecule expression in macrophages through modulation of JNK, p38, and STAT1. Evid Based Complement Alternat Med 2016:9824203
Ye K, Dinarello CA, Clark BD (1993) Identification of the promoter region of human interleukin 1 type I receptor gene: multiple initiation sites, high G + C content, and constitutive expression. Proc Natl Acad Sci USA 90:2295–2299
Yoshigai E, Hara T, Araki Y, Tanaka Y, Oishi M, Tokuhara K, Kaibori M, Okumura T, Kwon AH, Nishizawa M (2013) Natural antisense transcript-targeted regulation of inducible nitric oxide synthase mRNA levels. Nitric Oxide 30:9–16
Okuyama T, Nakatake R, Kaibori M, Okumura T, Kon M, Nishizawa M (2018) A sense oligonucleotide to inducible nitric oxide synthase mRNA increases the survival rate of rats in septic shock. Nitric Oxide 72:32–40
Acknowledgements
We thank Dr. Yuji Hasegawa for mass spectra analyses, Ms. Yuki Nakano for her technical assistance, and Ms. Noriko Kanazawa for her secretarial assistance. This work was supported in part by the Asia-Japan Research Institute of Ritsumeikan Asia-Japan Research Organization, Ritsumeikan University.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
Y. Yamauchi and T. Ishii performed this study as graduate students of the Graduate School of Life Sciences, Ritsumeikan University.
Rights and permissions
About this article
Cite this article
Yamauchi, Y., Okuyama, T., Ishii, T. et al. Sakuranetin downregulates inducible nitric oxide synthase expression by affecting interleukin-1 receptor and CCAAT/enhancer-binding protein β. J Nat Med 73, 353–368 (2019). https://doi.org/10.1007/s11418-018-1267-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11418-018-1267-x