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Erschienen in: Inflammation 3/2014

01.06.2014

The Antioxidant Effects of Isorhamnetin Contribute to Inhibit COX-2 Expression in Response to Inflammation: A Potential Role of HO-1

verfasst von: Kyuhwa Seo, Ji Hye Yang, Sang Chan Kim, Sae Kwang Ku, Sung Hwan Ki, Sang Mi Shin

Erschienen in: Inflammation | Ausgabe 3/2014

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Abstract

Previously, we reported that isorhamnentin, a 3′-O-methylated metabolite of quercetin, reduced inducible nitric oxide synthase (iNOS) expression and NO production. The present study further investigated the underlying mechanism of anti-inflammatory and antioxidant effects of isorhamnentin. Administration of isorhamnetin decreased the number of cyclooxygenase-2 (COX-2) positive cells in rats with carrageenan-induced paw edema. Isorhamnetin also suppressed lipopolysaccharide (LPS)-induced expression of COX-2 in cells. It is well known that LPS-induced reactive oxygen species (ROS) production leads to COX-2 induction. Isorhamnetin decreased LPS-induced ROS production and apoptosis. In addition, the basal expression of heme oxygenase-1 (HO-1) was increased by isorhamnetin treatment in agreement with the increase in nuclear translocation of NF-E2-related factor-2 (Nrf2), an essential transcription factor for the regulation of HO-1 expression. Moreover, pretreatment of tin protoporphyrin IX (SnPP), a chemical inhibitor of HO-1, reversed the ability of isothamnetin to inhibit COX-2 expression. These results demonstrate that induction of HO-1 by isorhamnetin leads to a reduction in ROS production and its antioxidant property might contribute to the inhibition of COX-2 expression in response to inflammation.
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Metadaten
Titel
The Antioxidant Effects of Isorhamnetin Contribute to Inhibit COX-2 Expression in Response to Inflammation: A Potential Role of HO-1
verfasst von
Kyuhwa Seo
Ji Hye Yang
Sang Chan Kim
Sae Kwang Ku
Sung Hwan Ki
Sang Mi Shin
Publikationsdatum
01.06.2014
Verlag
Springer US
Erschienen in
Inflammation / Ausgabe 3/2014
Print ISSN: 0360-3997
Elektronische ISSN: 1573-2576
DOI
https://doi.org/10.1007/s10753-013-9789-6

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