Identification of anti-inflammatory constituents in Phellodendri Cortex and Coptidis Rhizoma by monitoring the suppression of nitric oxide production View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2017-10

AUTHORS

Airi Fujii, Tetsuya Okuyama, Koji Wakame, Tadayoshi Okumura, Yukinobu Ikeya, Mikio Nishizawa

ABSTRACT

Phellodendri Cortex (Obaku in Japanese) and Coptidis Rhizoma (Oren), both of which contain berberine, have been used to prepare the kampo formula orengedokuto to treat inflammatory diseases, including dermatitis, gastric ulcers, and gastritis. These drugs are blended differently in other formulas, such as the use of Phellodendri Cortex in shichimotsukokato to treat hypertension and Coptidis Rhizoma in hangeshashinto to treat diarrhea and stomatitis. However, the differences in their medicinal properties are not well characterized. We prepared extracts from Phellodendron amurense bark (PAB) and Coptis chinensis rhizome (CCR) and separated them into alkaloid and non-alkaloid fractions. Anti-inflammatory effects were examined by monitoring the production of nitric oxide (NO), which is a pro-inflammatory mediator. A non-alkaloid fraction of the PAB extract suppressed NO production in hepatocytes more efficiently than that of the CCR extract. When each non-alkaloid fraction of the PAB and CCR extracts was administered to mice, the fractions of both extracts decreased the levels of mRNAs encoding inducible NO synthase and molecules in the interleukin-1β signaling pathway. Limonin and obakunone identified in the PAB non-alkaloid fraction suppressed NO production, exhibiting IC50 values of 16 and 2.6 μM, respectively, whereas berberine and coptisine displayed IC50 values of 12 and 14 μM, respectively. Limonin and obakunone reduced the expression of the iNOS gene, probably through the transcription factor nuclear factor-κB. Therefore, both limonoids and alkaloids may be responsible for the anti-inflammatory effects of the PAB extract, whereas alkaloids may be primarily responsible for those of the CCR extract. The different composition of the constituents may modulate the anti-inflammatory effects of Phellodendri Cortex and Coptidis Rhizoma. More... »

PAGES

745-756

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11418-017-1107-4

DOI

http://dx.doi.org/10.1007/s11418-017-1107-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1090355692

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28681120


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43 schema:description Phellodendri Cortex (Obaku in Japanese) and Coptidis Rhizoma (Oren), both of which contain berberine, have been used to prepare the kampo formula orengedokuto to treat inflammatory diseases, including dermatitis, gastric ulcers, and gastritis. These drugs are blended differently in other formulas, such as the use of Phellodendri Cortex in shichimotsukokato to treat hypertension and Coptidis Rhizoma in hangeshashinto to treat diarrhea and stomatitis. However, the differences in their medicinal properties are not well characterized. We prepared extracts from Phellodendron amurense bark (PAB) and Coptis chinensis rhizome (CCR) and separated them into alkaloid and non-alkaloid fractions. Anti-inflammatory effects were examined by monitoring the production of nitric oxide (NO), which is a pro-inflammatory mediator. A non-alkaloid fraction of the PAB extract suppressed NO production in hepatocytes more efficiently than that of the CCR extract. When each non-alkaloid fraction of the PAB and CCR extracts was administered to mice, the fractions of both extracts decreased the levels of mRNAs encoding inducible NO synthase and molecules in the interleukin-1β signaling pathway. Limonin and obakunone identified in the PAB non-alkaloid fraction suppressed NO production, exhibiting IC<sub>50</sub> values of 16 and 2.6 μM, respectively, whereas berberine and coptisine displayed IC<sub>50</sub> values of 12 and 14 μM, respectively. Limonin and obakunone reduced the expression of the iNOS gene, probably through the transcription factor nuclear factor-κB. Therefore, both limonoids and alkaloids may be responsible for the anti-inflammatory effects of the PAB extract, whereas alkaloids may be primarily responsible for those of the CCR extract. The different composition of the constituents may modulate the anti-inflammatory effects of Phellodendri Cortex and Coptidis Rhizoma.
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