Curcumin suppresses the production of interleukin-6 in Prevotella intermedia lipopolysaccharide-activated RAW 264.7 cells.
10.5051/jpis.2011.41.3.157
- Author:
Sung Jo KIM
1
Author Information
1. Department of Periodontology, Pusan National University School of Dentistry, Yangsan, Korea. sungjokim@pusan.ac.kr
- Publication Type:Original Article
- Keywords:
Curcumin;
Periodontal disease;
Prevotella intermedia;
Lipopolysaccharides;
Interleukin-6
- MeSH:
Curcumin;
DNA;
I-kappa B Proteins;
Immunoblotting;
Interleukin-6;
Lipopolysaccharides;
NF-kappa B;
Periodontal Diseases;
Phosphorylation;
Prevotella;
Prevotella intermedia;
Real-Time Polymerase Chain Reaction;
RNA, Messenger
- From:Journal of Periodontal & Implant Science
2011;41(3):157-163
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: Curcumin is known to exert numerous biological effects including anti-inflammatory activity. In this study, we investigated the effects of curcumin on the production of interleukin-6 (IL-6) by murine macrophage-like RAW 264.7 cells stimulated with lipopolysaccharide (LPS) from Prevotella intermedia, a major cause of inflammatory periodontal disease, and sought to determine the underlying mechanisms of action. METHODS: LPS was prepared from lyophilized P. intermedia ATCC 25611 cells by the standard hot phenol-water method. Culture supernatants were collected and assayed for IL-6. We used real-time polymerase chain reaction to detect IL-6 mRNA expression. IkappaB-alpha degradation, nuclear translocation of NF-kappaB subunits, and STAT1 phosphorylation were characterized via immunoblotting. DNA-binding of NF-kappaB was also analyzed. RESULTS: Curcumin strongly suppressed the production of IL-6 at both gene transcription and translation levels in P. intermedia LPS-activated RAW 264.7 cells. Curcumin did not inhibit the degradation of IkappaB-alpha induced by P. intermedia LPS. Curcumin blocked NF-kappaB signaling through the inhibition of nuclear translocation of NF-kappaB p50 subunit. Curcumin also attenuated DNA binding activity of p50 and p65 subunits and suppressed STAT1 phosphorylation. CONCLUSIONS: Although further study is required to explore the detailed mechanism of action, curcumin may contribute to blockade of the host-destructive processes mediated by IL-6 and appears to have potential therapeutic values in the treatment of inflammatory periodontal disease.
