Changes in IgM Memory B Cells after Splenectomy
Author Information
Author(s): Cameron Paul U., Jones Penelope, Gorniak Malgorzata, Dunster Kate, Paul Eldho, Lewin Sharon, Woolley Ian, Spelman Denis
Primary Institution: The Alfred Hospital, Melbourne, Victoria, Australia
Hypothesis
To assess changes in B cell sub-populations after splenectomy.
Conclusion
Splenectomy leads to a significant reduction in IgM memory B cells, which stabilizes within six months.
Supporting Evidence
- Total B cells in splenectomy patients did not differ from controls.
- Memory B cells and IgM memory B cells were significantly reduced.
- The reduction in IgM memory B cells reached a stable level within 6 months after splenectomy.
- Patients with IgM memory B cells above a certain cut-off had a high true positive rate for identifying splenic loss.
Takeaway
When people have their spleens removed, they lose a type of immune cell called IgM memory B cells, which help fight infections, but the number of these cells levels off after a while.
Methodology
The study analyzed blood samples from splenectomized patients and normal controls to measure IgM memory B cells using flow cytometry.
Potential Biases
The initial patient enrollment was biased toward incident splenectomy cases.
Limitations
The study did not assess the function of IgM memory B cells and had limited longitudinal data.
Participant Demographics
The study included 591 subjects, with a subset of 209 adult asplenic or hyposplenic subjects and normal controls.
Statistical Information
P-Value
p<0.001
Confidence Interval
95% confidence intervals provided for various measures.
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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