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Int J Mol Sci. 2018 Aug 23;19(9). pii: E2494. doi: 10.3390/ijms19092494.

Litsea japonica Leaf Extract Suppresses Proinflammatory Cytokine Production in Periodontal Ligament Fibroblasts Stimulated with Oral Pathogenic Bacteria or Interleukin-1β.

Author information

1
Department of Preventive and Public Health Dentistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Korea. heavenstairs@naver.com.
2
Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Korea. sun3193@jnu.ac.kr.
3
Jeju Biodiversity Research Institute (JBRI), Jeju Technopark (JTP), Jeju 63608, Korea. yyjkl@jejutp.or.kr.
4
Jeju Biodiversity Research Institute (JBRI), Jeju Technopark (JTP), Jeju 63608, Korea. cskim@jejutp.or.kr.
5
Department of Oral Biochemistry, School of Dentistry, Chosun University, Gwangju 61452, Korea. dbsruddl77@hanmail.net.
6
Department of Oral Biochemistry, School of Dentistry, Chosun University, Gwangju 61452, Korea. jkkook@chosun.ac.kr.
7
Department of Oral and Maxillofacial Surgery, School of Dentistry, Chonnam National University, Gwangju 61186, Korea. ashgray79@gmail.com.
8
Department of Preventive and Public Health Dentistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Korea. hochoi@chonnam.ac.kr.
9
Department of Oral Biochemistry, Dental Science Research Institute, School of Dentistry, Chonnam National University, Gwangju 61186, Korea. thlee83@jnu.ac.kr.
10
Department of Molecular Medicine (BK21plus), Chonnam National University Graduate School, Gwangju 61186, Korea. thlee83@jnu.ac.kr.

Abstract

Periodontal disease, a chronic disease caused by bacterial infection, eventually progresses to severe inflammation and bone loss. Regulating excessive inflammation of inflamed periodontal tissues is critical in treating periodontal diseases. The periodontal ligament (PDL) is primarily a connective tissue attachment between the root and alveolar bone. PDL fibroblasts (PDLFs) produce pro-inflammatory cytokines in response to bacterial infection, which could further adversely affect the tissue and cause bone loss. In this study, we determined the ability of Litsea japonica leaf extract (LJLE) to inhibit pro-inflammatory cytokine production in PDLFs in response to various stimulants. First, we found that LJLE treatment reduced lipopolysaccharide (LPS)-induced pro-inflammatory cytokine (interleukin-6 and interleukin-8) mRNA and protein expression in PDLFs without cytotoxicity. Next, we observed the anti-inflammatory effect of LJLE in PDLFs after infection with various oral bacteria, including Fusobacterium nucleatum, Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia. These anti-inflammatory effects of LJLE were dose-dependent, and the extract was effective following both pretreatment and posttreatment. Moreover, we found that LJLE suppressed the effect of interleukin-1 beta-induced pro-inflammatory cytokine production in PDLFs. Taken together, these results indicate that LJLE has anti-inflammatory activity that could be exploited to prevent and treat human periodontitis by controlling inflammation.

KEYWORDS:

IL-6; IL-8; Litsea japonica leaf extract; inflammation; periodontal disease; periodontal ligament

PMID:
30142971
PMCID:
PMC6163774
DOI:
10.3390/ijms19092494
[Indexed for MEDLINE]
Free PMC Article

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