Probable role ofStreptococcus pyogenes in Kawasaki disease
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Abstract
Over the past 25 years, the clinical course of Kawasaki disease has been defined, the prevalence and nature of the cardiovascular effects widely understood, and pathological changes in the most severe cases well described. However, the aetiology and pathogenesis of this puzzling disease have remained unclear, thus specific therapy is not yet available. Because of some close clinical similarities between this disease and streptococcal scarlet fever, particular attention has been paid to the possible role ofStreptococcus pyogenes as an aetiological agent in this illness. Until now, however, group A β-haemolytic streptococci have never been consistently isolated from any patients; in addition, the titre of antistreptolysin 0 is not raised, and lack of response to antibiotics is a feature of this disease. Our long series of investigations over more than 10 years, which will be covered in the present review, were performed in an attempt at elucidating causative agent(s) of Kawasaki disease. This has led to our firm belief in the probable role ofS. pyogenes in the pathogenesis of this disease, despite the lack of fulfillment of Koch's postulates, on the basis of the following findings. Patients with Kawasaki disease recovering from the acute, febrile phase of the illness exhibited an exaggerated cell-mediated reactivity, as measured by the macrophage migration inhibition test, to group A β-haemolytic streptococci, their pyrogenic exotoxin and streptolysin 0 as well as to several mammalian muscle cell extracts which are allegedly related antigenically to the cell wall and/or cytoplasmic membrane ofS. pyogenes. Protoplast-like “spherical bodies” varying in diameter from 0.5 to 1.5 μm, and devoid of cell walls, were detected in the buffy coats of peripheral blood from patients with this disease, and stained distinctly by immuno-electron microscopy using, as a primary antibody, a rabbit antiserum toS. pyogenes- derived protoplasts, and followed by absorption with protoplasts fromStaphylococcus aureus andEscherichia coli. Newborn mice infected withS. pyogenes having no capacity to confer cell-mediated immunity even in adult murine hosts, and reinfected 4–6 weeks later with another strain of the same species of bacteria which is able to elicit cellular immunity, showed a lack of humoral response to streptococcal antigens, leaving intact cell-mediated immunity. Such a biased immunological characteristic is an exact counterpart of that of Kawasaki disease patients. Consequently, in the subsequent experiment, peripheral blood lymphocytes from patients with this disease were cultured in the presence of pokeweed mitogen, streptolysin O andS. pyogenes-derived C-polysaccharide, confirming their refractoriness toS. pyogenes-associated antigens coupled with normal response to the unrelated antigen. A considerable amount of streptococcal pyrogenic exotoxin and its 100% incidence in the patient's sera were detected by the use of an enzyme-linked immunosorbent assay reinforced with a monoclonal antibody specific for the streptococcal exotoxin.
Key words
Kawasaki disease Streptococcus pyogenes Streptococcal pyrogenic exotonin Immunological toleranceAbbreviations
- ASLO
anti-streptolysin O
- CFA
complete Freund's adjuvant
- EA
early antigen
- EB
Epstein-Barr virus
- KD
Kawasaki disease
- MIF
migration inhibitory factor
- MIT
macrophage migration inhibition test
- PWM
pokeweed mitogen
- SIO
streptolysin O
- SPE
streptococcal pyrogenic exotoxin
- VCA
viral capsid antigen
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References
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