Porphyromonas gingivalis hydrogen sulfide enhances methyl mercaptan-induced pathogenicity in mouse abscess formation
| Autor: | Tomonori Hoshino, Nobuo Yoshinari, Akihiro Yoshida, Taku Fujiwara, Koki Shioya, B. Yukihiro Hiraoka, Nao Suzuki, Toshihiro Ansai, Suguru Nakamura |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Hydrogen sulfide 030106 microbiology Mutant Inflammation Microbiology 03 medical and health sciences chemistry.chemical_compound Methionine Bacterial Proteins medicine Bacteroidaceae Infections Animals Cysteine Hydrogen Sulfide Sulfhydryl Compounds Abscess Porphyromonas gingivalis chemistry.chemical_classification Mice Inbred BALB C biology Virulence equipment and supplies medicine.disease biology.organism_classification Pathogenicity Carbon-Sulfur Lyases Disease Models Animal Enzyme chemistry Female medicine.symptom Gene Deletion |
| Zdroj: | Microbiology (Reading, England). 164(4) |
| ISSN: | 1465-2080 |
| Popis: | Porphyromonas gingivalis produces hydrogen sulfide (H2S) from l-cysteine. However, the role of H2S produced by P. gingivalis in periodontal inflammation is unclear. In this study, we identified the enzyme that catalyses H2S production from l-cysteine and analysed the role of H2S using a mouse abscess model. The enzyme identified was identical to methionine γ-lyase (PG0343), which produces methyl mercaptan (CH3SH) from l-methionine. Therefore, we analysed H2S and CH3SH production by P. gingivalis W83 and a PG0343-deletion mutant (ΔPG0343) with/without l-cysteine and/or l-methionine. The results indicated that CH3SH is produced constitutively irrespective of the presence of l-methionine, while H2S was greatly increased by both P. gingivalis W83 and ΔPG0343 in the presence of l-cysteine. In contrast, CH3SH production by ΔPG0343 was absent irrespective of the presence of l-methionine, and H2S production was eliminated in the absence of l-cysteine. Thus, CH3SH and H2S production involves different substrates, l-methionine or l-cysteine, respectively. Based on these characteristics, we analysed the roles of CH3SH and H2S in abscess formation in mice by P. gingivalis W83 and ΔPG0343. Abscess formation by P. gingivalis W83, but not ΔPG0343, differed significantly in the presence and absence of l-cysteine. In addition, the presence of l-methionine did not affect the size of abscesses generated by P. gingivalis W83 and ΔPG0343. Therefore, we conclude that H2S produced by P. gingivalis does not induce inflammation; however, H2S enhances inflammation caused by CH3SH. Thus, these results suggest the H2S produced by P. gingivalis plays a supportive role in inflammation caused by methionine γ-lyase. |
| Databáze: | OpenAIRE |
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