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Autoantibodies in falciparum malaria: a sequential study in 183 Thai patients
Abstract:
Various autoantibodies were sequentially studied in 183 consecutive Thai adults infected with Plasmodium falciparum. On the first day of admission, 31.1% of the patients had positive fluorescent anti-nuclear antibodies (FANA) and 16.9% had positive smooth muscle antibodies (SMA). The incidences of positive FANA and SMA rose progressively with times when the patients returned for the 2 and 4 week follow-ups after discharge, although most of their malaria was cured. The majority of the positive FANA and SMA titres lay between 1:20 and 1:160. The positivity of the FANA and SMA did not correlate with the complications of malaria, nor the initial serum IgG or IgA levels. However, they significantly correlated with the initial hyper-IgM. More interestingly, almost all of the positive FANA were of the speckled type of nuclear staining. The antigen specificity of the speckled FANA were found not to be the double stranded DNA or the extractable nuclear antigens. The polyclonal B cell activation in active malarial infection was postulated.
Insights
Malaria infection in Thai adults can trigger autoantibodies like fluorescent anti-nuclear antibodies (FANA) and smooth muscle antibodies (SMA). These antibodies increased over time, correlating with hyper-IgM, suggesting polyclonal B cell activation during Plasmodium falciparum infection.
Area of Science:
- Immunology
- Infectious Diseases
- Autoimmunity
Background:
- Plasmodium falciparum malaria is a significant global health concern.
- Autoantibody production is a known complication in various infections.
- The specific immunological responses during malaria, particularly autoantibody generation, require further elucidation.
Purpose of the Study:
- To investigate the prevalence and dynamics of autoantibodies in Thai adults with Plasmodium falciparum malaria.
- To explore the correlation between autoantibody positivity and clinical parameters, including malaria complications and immunoglobulin levels.
- To postulate the underlying immunological mechanisms driving autoantibody formation during acute malaria.
Main Methods:
- Sequential study of autoantibodies, including fluorescent anti-nuclear antibodies (FANA) and smooth muscle antibodies (SMA), in 183 Thai adults with P. falciparum malaria.
- Assessment of antibody titers at admission and during follow-up visits (2 and 4 weeks post-discharge).
- Correlation analysis with malaria complications, serum IgG, IgA, and IgM levels, and antigen specificity of FANA.
Main Results:
- On admission, 31.1% of patients had positive FANA and 16.9% had positive SMA.
- Autoantibody incidences increased progressively during follow-up, even after malaria cure.
- Positive FANA and SMA correlated significantly with initial hyper-IgM but not with malaria complications or initial IgG/IgA levels.
- Speckled FANA, not directed against dsDNA or extractable nuclear antigens, were predominantly observed.
Conclusions:
- Plasmodium falciparum malaria in Thai adults is associated with the development and persistence of autoantibodies (FANA and SMA).
- The observed autoantibody profile suggests a link to polyclonal B cell activation, indicated by the correlation with hyper-IgM.
- Further research is needed to fully understand the long-term implications of these autoantibodies in malaria patients.