Anti-inflammatory effects of flavonoids in Citrus jabara fruit peels

Seisho Azuma, Yoshinobu Murakami, Eiko Azuma, Kimiye Baba, Masahiko Taniguchi

Abstract


Currently, about half of people in Japan suffer from allergic diseases. Thus, Citrus jabara fruits have been paid attention as one of quite effective anti-allergic functional foods. C. jabara is an endemic species originally grown only in Kitayama village, Wakayama prefecture in Japan. Although genetic characterization and diversity of various Citrus fruits including C. jabara were researched, but there is room for the study on flavonoids characteristics in C. jabara fruit. For the alleviation of allergic symptom, anti-inflammatory effects are also important. In this study, characteristics of flavonoids in C. jabara fruit peels, and the anti-inflammatory effects of these purified flavonoids were investigated. Our results revealed that C. jabara is a unique Citrus that almost all of flavonoids in fruit peels was narirutin. There was no Citrus species with a flavanone glycosides content ratio like C. jabara. Although anti-inflammatory effects of narirutin was weak, but its aglycone naringenin exhibited following inhibitory effects: nitric oxide synthesis (IC50 = 105 μM), nitric oxide synthase induction, Interleukin-6 synthesis (IC50 = 65 μM), and inducible soluble epoxide hydrolase activity (IC50 = 267 μM). Since narirutin is deglycosylated to naringenin that is then absorbed by colonocytes, it is considered that narirutin exists like a prodrug and its aglycone naringenin works as an active form of anti-inflammatory effect in a living body at oral ingestion of C. jabara fruit peels.


Keywords


Citrus jabara; anti-inflammatory effects; flavonoids; narirutin; naringenin

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References


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DOI: http://dx.doi.org/10.24294/ti.v2.i2.844

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