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Updated: Aug 18, 2026
Depletion and Reconstitution of Macrophages in Mice
Published on: August 1, 2012
Influence of pyrrolidine dithiocarbamate on the inflammatory response in macrophages and mouse endotoxin shock
M Meisner1, J Schmidt, M Schywalsky
1Department of Anesthesiology, University of Jena, Bachstr. 18, D-07743, Jena, Germany. meisner@anae1.med.uni-jena.de
Abstract:
To analyze the immunomodulatory effect of pyrrolidine dithiocarbamate (PDTC) on the endotoxin (LPS) stimulated inflammatory response, we measured the LPS-stimulated cytokine and NO production in murine peritoneal macrophages, J774A.1 cells and human whole blood in the presence of PDTC (60 microM). PDTC significantly inhibited the production of nitrite, IL-1beta and IL-6 in these cells. TNFalpha release was stimulated in murine cells, but suppressed in human whole blood. We further investigated the influence of PDTC on mortality and cytokine release in mouse endotoxin shock. PDTC was i.p. injected 30 min prior to the induction of endotoxin shock in female NMRI-mice and survival was significantly improved as compared to controls (48% vs 20%, n=25 per group). Plasma concentrations of TNFalpha were slightly augmented while IL-6 levels were decreased in PDTC-treated animals as compared to controls, however, without reaching significance. We conclude that PDTC is a potent immunomodulatory substance that modulates the inflammatory response in vitro and reduces mortality in mouse endotoxin shock. The pathophysiological mechanisms of the protective effect of PDTC in vivo, however, appears to be pluripotent, comprising both antioxidative properties and the inhibition of NF-kB.
Insights
Pyrrolidine dithiocarbamate (PDTC) effectively modulates inflammatory responses by inhibiting key cytokines and nitric oxide (NO) production. This compound also significantly reduces mortality in mouse models of endotoxin shock.
Area of Science:
- Immunology
- Pharmacology
- Toxicology
Background:
- Endotoxin (LPS) triggers potent inflammatory responses.
- Pyrrolidine dithiocarbamate (PDTC) is investigated for its immunomodulatory potential.
- Understanding PDTC's effects is crucial for managing inflammatory conditions.
Purpose of the Study:
- To analyze the immunomodulatory effects of PDTC on LPS-stimulated inflammatory responses.
- To evaluate PDTC's impact on cytokine and nitric oxide (NO) production in vitro.
- To assess PDTC's efficacy in reducing mortality in a mouse model of endotoxin shock.
Main Methods:
- Measurement of nitrite, IL-1beta, IL-6, and TNFalpha production in murine macrophages, J774A.1 cells, and human whole blood treated with PDTC and LPS.
- Administration of PDTC prior to LPS induction in a mouse endotoxin shock model.
- Monitoring survival rates and plasma cytokine levels in treated and control mice.
Main Results:
- PDTC significantly inhibited nitrite, IL-1beta, and IL-6 production in vitro.
- TNFalpha release was differentially affected: stimulated in murine cells but suppressed in human whole blood.
- PDTC treatment significantly improved survival in mice with endotoxin shock (48% vs 20%).
Conclusions:
- PDTC is a potent immunomodulatory agent affecting inflammatory responses in vitro.
- PDTC demonstrates a protective effect against mortality in mouse endotoxin shock.
- The protective mechanisms of PDTC involve antioxidative properties and NF-kB inhibition.
