Relative neutralizing activity in polyspecific IgM, IgA, and IgG preparations against group A streptococcal superantigens

Anna Norrby-Teglund, Nahla Ihendyane, Rita Kansal, Hesham Basma, Malak Kotb, Jan Andersson, Lennart Hammarström

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43 Scopus citations


In this study we compared the ability of different immunoglobulin (Ig) preparations containing IgG, IgM, and/or IgA to neutralize the activity of streptococcal pyrogenic exotoxin A (SpeA) or culture supernatant from a clinical group A streptococcal isolate. All Ig preparations markedly inhibited the mitogenic and cytokine-inducing activity of SpeA and culture supernatant at concentrations of 0.05-0.5 mg/mL, and at 0.5 mg/mL, most caused 95-100% inhibition of both stimuli. A significantly higher (P ≤ .05) inhibition of SpeA was achieved by Pentaglobin (IgG, IgM, and IgA) and IgAbulin (IgA and IgG), as compared with pure IgG preparations. IgM- and IgA-enriched preparations had significantly higher inhibitory activity against SpeA than against culture supernatant, whereas the reverse was true for the IgG preparations (P ≤ .05). The data show that IgM and IgA are potent inhibitors of specific streptococcal superantigens. These findings may have implications for the optimization of immunotherapy in invasive streptococcal infections.

Original languageEnglish (US)
Pages (from-to)1175-1182
Number of pages8
JournalClinical Infectious Diseases
Issue number5
Publication statusPublished - Jan 1 2000


ASJC Scopus subject areas

  • Microbiology (medical)
  • Infectious Diseases

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