Int J Oral Biol.  2017 Mar;42(1):33-38. 10.11620/IJOB.2017.42.1.33.

Ursodeoxycholic Acid Inhibits Inflammatory Cytokine Expression in THP-1 Cells Infected with Aggregatibacter actinomycetemcomitans

Affiliations
  • 1Department of Oral Microbiology, School of Dentistry, Pusan National University, Yangsan 50612, Korea. jchung@pusan.ac.kr

Abstract

BACKGROUND
Periodontitis is an inflammatory disease characterized by the breakdown of tooth-supporting tissues, leading to tooth loss. Aggregatibacter actinomycetemcomitans are major etiologic bacterium causing aggressive periodontitis. Ursodeoxycholic acid (UDCA), a hydrophilic gall bladder acid, has been used as an effective drug for various diseases related to immunity. The aim of this study was to investigate the effect of UDCA on the inflammatory response induced by A. actinomycetemcomitans.
METHODS
A human acute monocytic leukemia cell line (THP-1) was differentiated to macrophage- like cells by treatment with phorbol 12-mystristate 13-acetate (PMA) and used for all experiments. The cytotoxic effect of UDCA was examined by MTT assay. THP-1 cells were pretreated with UDCA for 30 min before A. actinomycetemcomitans infection and the culture supernatant was analyzed for various cytokine production by ELISA. The effect of UDCA on bacterial growth was examined by measuring optical densities using a spectrophotometer.
RESULTS
UDCA showed no cytotoxic effect on THP-1 cells, up to 80 µM Ed highlight: Please confirm technical meaning. UDCA pretreatment inhibited the A. actinomycetemcomitans-induced IL-1β, TNF-α, and IL-17A secretion in a dosedependent manner. UDCA also inhibited IL-21 production at 60 µM. The production of IL-12 and IL-4 was not influenced by A. actinomycetemcomitans infection.
CONCLUSION
These findings indicate that UDCA inhibits the production of inflammatory cytokines involved in innate and Th17 immune responses in A. actinomycetemcomitans-infected THP-1-derived macrophages, which suggests its possible use for the control of aggressive periodontitis.

Keyword

A. actinomycetemcomitans; ursodeoxycholic acid; macrophage; IL-1β; TNF-α; IL-17A; periodontitis

MeSH Terms

Aggregatibacter actinomycetemcomitans*
Aggregatibacter*
Aggressive Periodontitis
Cell Line
Cytokines
Enzyme-Linked Immunosorbent Assay
Humans
Interleukin-12
Interleukin-17
Interleukin-4
Leukemia, Monocytic, Acute
Macrophages
Periodontitis
Tooth Loss
Urinary Bladder
Ursodeoxycholic Acid*
Cytokines
Interleukin-12
Interleukin-17
Interleukin-4
Ursodeoxycholic Acid
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