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Volatile Fatty Acids, Metabolic By-products of Periodontopathic Bacteria, Inhibit Lymphocyte Proliferation and Cytokine Production

Department of Microbiology, Nihon University, School of Dentistry at Matsudo, Matsudo Chiba 271, Japan

K. Fukushima

Department of Microbiology, Nihon University, School of Dentistry at Matsudo, Matsudo Chiba 271, Japan

K. Ochiai

Department of Microbiology, Nihon University, School of Dentistry at Matsudo, Matsudo Chiba 271, Japan

Short-chain fatty acids are a major by-product of anaerobic metabolism and can be detected in gingival fluid from periodontal pockets. Since most T cells are present subjacent to the pocket epithelium in conjunction with the plasma cells, it is important to know how these T cells are affected by short-chain fatty acids produced by subgingival plaque. The purpose of this study is to examine the effects of extracellular metabolites from periodontopathic bacteria on the proliferation and cytokine production of mouse splenic cells as a potential mechanism of imbalance among host-microbial interactions. A low-molecular-weight, heat-stable agent present in the two-day culture filtrate of Porphyromonas gingival is, Prevotella loescheii, and Fusobacterium nucleatum significantly depressed Con A- and LPS- induced cell proliferation. To determine whether short-chain fatty acids present in the filtrate could account for the depression, we tested extracted volatile and nonvolatile fatty acids for their effects on mitogenic activity. The volatile fatty acids extracted from immunosuppressive supernatants greatly inhibited T- and B- cell proliferation. Among these volatile fatty acids, butyric, propionic, valeric, and isovaleric acids impaired cell proliferation dose-dependently. From gas-liquid chromatographic analysis data, it is suggested that immuno-inhibitory activities in culture filtrates are mainly attributable to butyric and isovaleric acids in P. gingival is, to propionic, butyric, and isovaleric acids in P. loescheii, and to butyric acid in F. nucleatum. Furthermore, these fatty acids significantly depressed interleukin 2 (IL-2), IL-4, IL-5, IL-6, and IL-10 production by Con A-stimulated splenic-T cells dose-dependently. These results suggest that the volatile fatty acids produced by periodontopathic bacteria, easily penetrating the oral mucosa, severely harm periodontal tissue, including immunoregulatory cells.

Key Words: volatile fatty acid • lymphocyte • cytokine • periodontopathic bacteria

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Journal of Dental Research, Vol. 74, No. 7, 1367-1373 (1995)
DOI: 10.1177/00220345950740070801


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