Publications by authors named "K Yamakami"

An oral infectious disease, dental caries, is caused by the cariogenic streptococci Streptococcus mutans. The expected preventive efficiency for prophylactics against dental caries is not yet completely observed. Nisin, a bacteriocin, has been demonstrated to be microbicidal against S.

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It is well known that glomerulonephritis can occur after streptococcal infection, which is classically referred to as acute poststreptococcal glomerulonephritis (APSGN). The pathogenic mechanism of APSGN has been described by so-called immune complex theory, which involves glomerular deposition of nephritogenic streptococcal antigen and subsequent formation of immune complexes in situ and/or the deposition of circulating antigen-antibody complexes. However, the exact entity of the causative antigen has remained a matter of debate.

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Article Synopsis
  • Dental caries are caused by harmful bacteria called cariogenic streptococci, which create biofilms made of insoluble glucans, making them difficult to combat.
  • The study investigated the effectiveness of nisin, an antimicrobial agent, in preventing the synthesis of these harmful biofilms, using both naked nisin and liposome-encapsulated nisin (nisin-liposome).
  • Results showed that while naked nisin effectively suppressed biofilm formation, nisin-liposome was more efficient and prolonged the inhibitory effect for a longer duration, suggesting its potential use in preventive dental care.
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The nephritis-associated plasmin receptor is a recently identified nephritogenic antigen associated with acute poststreptococcal glomerulonephritis and proposed to play a pathogenic role, but its precise glomerular localization in acute poststreptococcal glomerulonephritis has not been elucidated. We therefore analyzed renal biopsy sections from 10 acute poststreptococcal glomerulonephritis patients by using immunofluorescence staining with anti-nephritis-associated plasmin receptor antibody and various markers of glomerular components. Nephritis-associated plasmin receptor was detected in the glomeruli of all patients, and double staining for nephritis-associated plasmin receptor and collagen IV showed nephritis-associated plasmin receptor to be predominantly on the inner side of the glomerular tufts.

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