Journal of Microbiology

Journal Article

Possible Translocation of Periodontal Pathogens into the Lymph Nodes Draining the Oral Cavity: G. Amodini Rajakaruna , Makoto Umeda , Keisuke Uchida , Asuka Furukawa , Bae Yuan , Yoshimi Suzuki , Ebe Noriko , Yuichi Izumi , Yoshinobu Eishi; J. Microbiol. 2012;50(5):827-836. Published online November 4, 2012; DOI: https://doi.org/10.1007/s12275-012-2030-8

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Abstract: Numerous publications have reported the presence of periodontopathogenic bacteria in peripheral and central vascular lesions. However, it is unclear how this bacterial translocation occurs. The objective of this study was to investigate whether periodontopathic bacteria are translocated to lymph nodes proximal to the oral cavity. Obtaining lymph node samples is not ethically feasible unless they are excised as part of the surgical management of patients with cancer. This study analyzed formalin-fixed and paraffin-embedded lymph nodes, histologically negative for cancer cell invasion, that were excised from 66 patients with histories of head and neck cancer. Real-time PCR was performed to amplify the 16S ribosomal DNA fragments from Porphyromonas gingivalis, Treponema denticola, Aggregatibacter actinomycetemcomitans, Tannerella forsythia, and Prevotella intermedia. The relationship between bacterial detection and cancer severity, gender, and the use of anti-cancer therapy was examined by Fisher’s exact test. P. gingivalis, T. forsythia, and P. intermedia were present in 17%, 8%, and 8% of the samples of submandibular and submental lymph nodes, respectively. There were no significant relationships between bacterial detection and the cancer disease status, patient gender or use of anticancer therapy. According to these data, it appears that the translocation of periodontopathic bacteria may occur via lymphatic drainage, irrespective of the cancer disease status, gender or anticancer therapy.

Research Support, Non-U.S. Gov't

Inhibitory Effect of Lactobacillus reuteri on Periodontopathic and Cariogenic Bacteria: Mi-Sun Kang , Jong-Suk Oh , Hyun-Chul Lee , Hoi-Soon Lim , Seok-Woo Lee , Kyu-Ho Yang , Nam-Ki Choi , Seon-Mi Kim; J. Microbiol. 2011;49(2):193-199. Published online May 3, 2011; DOI: https://doi.org/10.1007/s12275-011-0252-9

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Abstract: The interaction between Lactobacillus reuteri, a probiotic bacterium, and oral pathogenic bacteria have not been studied adequately. This study examined the effects of L. reuteri on the proliferation of periodontopathic bacteria including Aggregatibacter actinomycetemcomitans, Fusobacterium nucleatum, Porphyromonas gingivalis, and Tannerella forsythia, and on the formation of Streptococcus mutans biofilms. Human-derived L. reuteri strains (KCTC 3594 and KCTC 3678) and rat-derived L. reuteri KCTC 3679 were used. All strains exhibited significant inhibitory effects on the growth of periodontopathic bacteria and the formation of S. mutans biofilms. These antibacterial activities of L. reuteri were attributed to the production of organic acids, hydrogen peroxide, and a bacteriocin-like compound. Reuterin, an antimicrobial factor, was produced only by L. reuteri KCTC 3594. In addition, L. reuteri inhibited the production of methyl mercaptan by F. nucleatum and P. gingivalis. Overall, these results suggest that L. reuteri may be useful as a probiotic agent for improving oral health.

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