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Published on: July 19, 2018
Biocompatibility reduces inflammation-induced apoptosis in mesothelial cells exposed to peritoneal dialysis fluid
Background/Aims:
Peritonitis is a major complication that arises out of peritoneal dialysis (PD), leading to death and loss of mesothelium and peritoneal injury, which may impede PD. We studied the combined impact of inflammatory mediators and PD fluids on mesothelial cell death.
Methods:
Cultured human mesothelial cells.
Results:
Inflammatory cytokines (TNF-α and interferon-γ) cooperate with bioincompatible PD fluids containing high glucose degradation product (GDP) concentrations to promote mesothelial cell death. Thus, the inflammatory cytokine cocktail induced a higher rate of death in cells cultured in high GDP PD fluid than in low GDP PD fluid or cell culture medium (cell death expressed as % hypodiploid cells: TNF-α and interferon-γ in RPMI: 14.15 ± 1.68, TNF-α and interferon-γ in 4.25% low GDP PD fluid 13.16 ± 3.29, TNF-α and interferon-γ in 4.25% high GDP PD fluid 25.88 ± 2.18%, p < 0.05 vs. the other two groups). BclxL BH4 peptides, Apaf-1 inhibition or caspase inhibition failed to protect from apoptosis induced by the combination of inflammatory cytokines and bioincompatible PD fluids, although they protected from other forms of mesothelial cell apoptosis.
Conclusion:
Inflammation cooperates with high GDP PD fluids to promote mesothelial cell death, which is resistant to several therapeutic approaches. This information provides a framework for selection of PD fluid during peritonitis.
Insights
Inflammation and high glucose degradation product (GDP) peritoneal dialysis (PD) fluids cause mesothelial cell death. This cell death is resistant to common apoptosis inhibitors, impacting PD treatment strategies.
Area of Science:
- Nephrology
- Cell Biology
- Biomaterials Science
Background:
- Peritonitis is a serious complication of peritoneal dialysis (PD).
- It leads to mesothelial cell death and peritoneal injury, potentially hindering PD.
- The combined effects of inflammatory mediators and PD fluids on mesothelial cells are critical.
Purpose of the Study:
- To investigate the synergistic impact of inflammatory mediators and PD fluids on mesothelial cell death.
- To understand the mechanisms underlying PD-related peritonitis and cell injury.
Main Methods:
- Utilized cultured human mesothelial cells.
- Exposed cells to inflammatory cytokines (TNF-α, interferon-γ) and PD fluids with varying glucose degradation product (GDP) concentrations.
Main Results:
- Inflammatory cytokines and high GDP PD fluids significantly increased mesothelial cell death compared to low GDP fluids or standard medium.
- Cell death rates were significantly higher in high GDP PD fluid (25.88 ± 2.18%) than low GDP PD fluid (13.16 ± 3.29%) or RPMI (14.15 ± 1.68%).
- Therapeutic approaches targeting BclxL, Apaf-1, or caspases did not prevent apoptosis induced by the combined inflammatory and PD fluid challenge.
Conclusions:
- Inflammation and high GDP PD fluids synergistically promote mesothelial cell death.
- This cell death pathway is resistant to several known therapeutic interventions.
- Findings offer a basis for selecting appropriate PD fluids during peritonitis episodes.
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