Polyphenols extracted from Hibiscus sabdariffa L. inhibited lipopolysaccharide-induced inflammation by improving antioxidative conditions and regulating cyclooxygenase-2 expression.
Oxidative stress and inflammation are related to several chronic diseases including cancer and atherosclerosis. Hibiscus sabdariffa Linnaeus has been found to possess antioxidant effects. In this study, polyphenols extracted from Hibiscus sabdariffa L. (HPE) were used to detect anti-inflammatory effects on nitrite and prostaglandin E(2) (PGE(2)) in lipopolysaccharide (LPS) treated RAW264.7 cells. Sequentially, an animal model examination was performed to confirm the effects of HPE on LPS-induced hepatic inflammation. The results showed that HPE reduced 94.6% of xanthine oxidase activity in vitro, and decreased nitrite and PGE(2) secretions in LPS-induced cells. In LPS-treated rats, HPE significantly decreased the serum levels of alanine and aspartate aminotransferase. In the liver, lipid peroxidation and liver lesions decreased, and catalase activity and glutathione increased. The study also revealed that down-regulation of cyclooxygenase-2 (COX-2), p-c-Jun N-terminal kinase (p-JNK) and p-P38 might have been involved. In sum, this study found an anti-inflammatory potency of HPE both in vitro and in vivo.
Kao
Erl-Shyh
ES
Department of Beauty Science, College of Humanity, Chienkuo Technology University, Changhua City, Taiwan.
Hsu
Jeng-Dong
JD
Wang
Chau-Jong
CJ
Yang
Su-Huei
SH
Cheng
Su-Ya
SY
Lee
Huei-Jane
HJ
D000818:Animals; D000893:Anti-Inflammatory Agents / Q000302:isolation & purification / Q000494:pharmacology / Q000627:therapeutic use; D000975:Antioxidants / Q000378:metabolism*; D002460:Cell Line; D051546:Cyclooxygenase 2 / Q000378:metabolism*; D005419:Flavonoids / Q000302:isolation & purification / Q000494:pharmacology* / Q000627:therapeutic use; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects*; D031584:Hibiscus / Q000737:chemistry*; D007249:Inflammation / Q000139:chemically induced / Q000188:drug therapy / Q000378:metabolism* / Q000473:pathology; D015227:Lipid Peroxidation / Q000187:drug effects; D008070:Lipopolysaccharides / Q000037:antagonists & inhibitors* / Q000633:toxicity; D008099:Liver / Q000166:cytology / Q000187:drug effects / Q000473:pathology; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism; D008297:Male; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II / Q000378:metabolism; D010636:Phenols / Q000302:isolation & purification / Q000494:pharmacology* / Q000627:therapeutic use; D010936:Plant Extracts / Q000737:chemistry; D059808:Polyphenols; D051381:Rats; D014969:Xanthine Oxidase / Q000378:metabolism
D000893:Anti-Inflammatory Agents; D000975:Antioxidants; D005419:Flavonoids; D008070:Lipopolysaccharides; D010636:Phenols; D010936:Plant Extracts; D059808:Polyphenols; D052247:Nitric Oxide Synthase Type II; D051546:Cyclooxygenase 2; D014969:Xanthine Oxidase; D020929:Mitogen-Activated Protein Kinase Kinases