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IL-4 mRNA expression by peritoneal cells during episodes of peritonitis in patients on continuous ambulatory
C J Watson1, J J Finlay-Jones, P J McDonald
1Department of Microbiology and Infectious Diseases, School of Medicine, Flinders University of South Australia, Adelaide.
Abstract:
Peritoneal cells were isolated from dialysates drained from nine patients on continuous ambulatory peritoneal dialysis (CAPD) during episodes of peritonitis. Levels of expression of mRNA for the regulatory cytokines, interferon-gamma (IFN-gamma) and IL-4, were investigated daily, where possible, during the first 5 days of peritonitis. Cytokine mRNA levels were compared with those of peripheral blood mononuclear cells (PBMC) stimulated in vitro with phorbol 12-myristate 13-acetate (PMA) plus phytohaemagglutinin (PHA). Peritoneal cells expressed low levels of IFN-gamma mRNA; for four of nine patients, IL-4 mRNA levels greater than those expressed by stimulated PBMC were detected. There was no pattern of cytokine mRNA expression associated with the types of organisms detected in dialysates at initiation of peritonitis. However, in contrast to those patients with a transient, resolving peritonitis, significant IL-4 mRNA expression was detected in cells isolated early in the episodes of peritonitis in patients who suffered recurrent peritonitis within 30 days of the initial peritonitis episode. These results suggest an association between early IL-4 mRNA expression and susceptibility to further infections. The known anti-inflammatory effects of IL-4 may explain this association.
Insights
Early expression of interleukin-4 (IL-4) mRNA in peritoneal dialysis patients experiencing peritonitis may indicate a higher risk of recurrent infections. This finding suggests IL-4
Area of Science:
- Immunology
- Nephrology
- Molecular Biology
Background:
- Peritonitis is a serious complication in continuous ambulatory peritoneal dialysis (CAPD).
- Understanding the local immune response in the peritoneum during peritonitis is crucial for managing CAPD patients.
- Cytokines play a key role in regulating immune responses during infection.
Purpose of the Study:
- To investigate the expression patterns of messenger RNA (mRNA) for interferon-gamma (IFN-gamma) and interleukin-4 (IL-4) in peritoneal cells during peritonitis.
- To correlate cytokine mRNA expression with the clinical course and recurrence of peritonitis in CAPD patients.
- To explore the potential role of IL-4 in susceptibility to recurrent peritonitis.
Main Methods:
- Peritoneal cells were isolated from dialysates of nine CAPD patients during peritonitis episodes.
- Daily measurement of IFN-gamma and IL-4 mRNA levels during the initial 5 days of peritonitis.
- Comparison of peritoneal cell cytokine mRNA levels with in vitro stimulated peripheral blood mononuclear cells (PBMC).
Main Results:
- Low levels of IFN-gamma mRNA were observed in peritoneal cells.
- Four out of nine patients showed IL-4 mRNA levels exceeding those in stimulated PBMC.
- Significant early IL-4 mRNA expression was detected in patients who experienced recurrent peritonitis within 30 days, unlike those with resolving peritonitis.
Conclusions:
- Early expression of IL-4 mRNA in peritoneal cells during peritonitis is associated with an increased risk of recurrent infections in CAPD patients.
- The anti-inflammatory properties of IL-4 may contribute to this observed association with recurrent peritonitis.
- These findings highlight a potential biomarker for predicting peritonitis recurrence in CAPD.