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Bacteroides gingivalis, Bacteroides asaccharolyticus, andBacteroides melaninogenicus subspecies: Cell surface morphology and adherence to erythrocytes and human buccal epithelial cells

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Abstract

All study strains ofBacteroides gingivalis, B. asaccharolyticus, andB. melaninogenicus subspecies possessed numerous pilus-like fibers and capsule-like outer surface structures. The capsular morphology varied between the different species and subspecies.B. gingivalis strongly agglutinated 16 erythrocyte species studied.B. asaccharolyticus showed variable and weak agglutination of only a few erythrocyte species.B. melaninogenicus subsp.intermedius strains strongly agglutinated rabbit erythrocytes and exhibited variable, often weak agglutination of 8 other erythrocyte species. Preparations of capsular polysaccharide or lipopolysaccharide fromB. gingivalis failed to agglutinate human erythrocytes, while pili preparations from the same organisms possessed marked hemagglutinating activity.B. gingivalis cells adhered in high numbers to human buccal epithelial cells, whereas strains ofB. asaccharolyticus failed to show measurable adherence. Oral strains ofB. melaninogenicus subsp.intermedius feebly adhered to the buccal epithelial cells. Pretreatment ofB. gingivalis cells with serum or saliva prevented the adherence to epithelial cells. Our findings suggest that cell surfaces with distinct properties exist on the various black-pigmentedBacteroides species and subspecies and this may accout for markedly differing ability of these organisms to attach to mammalian cells.

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Authors and Affiliations

  1. Department of Microbiology, Tokyo Dental College, Misakichio, Chiyodaku, Tokyo, Japan

    Katsuji Okuda & Jørgen Slots

  2. Department of Oral Biology and Periodontal Disease Clinical Research Center, State University of New York at Buffalo, 14226, Buffalo, New York, USA

    Robert J. Genco

Authors
  1. Katsuji Okuda
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  2. Jørgen Slots
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  3. Robert J. Genco
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Okuda, K., Slots, J. & Genco, R.J. Bacteroides gingivalis, Bacteroides asaccharolyticus, andBacteroides melaninogenicus subspecies: Cell surface morphology and adherence to erythrocytes and human buccal epithelial cells. Current Microbiology 6, 7–12 (1981). https://doi.org/10.1007/BF01566718

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