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Updated: Aug 11, 2026
Depletion and Reconstitution of Macrophages in Mice
Published on: August 1, 2012
Effect of carrageenan on activity of the mononuclear phagocyte system in the mouse
Abstract:
Injection of 5 mg carrageenan caused hepatosplenomegaly and thymic involution and resulted in temporary blockade of the mononuclear phagocyte system (MPS). Impaired MPS activity was shown by decreased hepatic phagocytosis of i.v. injected colloidal carbon and 51Cr-labelled sheep red blood cells (SRBC). Depression of Kupffer cell activity was dependent on carrageenan dose, route of administration and interval between carrageenan and particle injection. Reduction in hepatic uptake of SRBC was accompanied by increased localization of these cells within the spleen.
Insights
Carrageenan injection temporarily blocks the mononuclear phagocyte system (MPS), impairing liver function and increasing spleen activity. This effect on Kupffer cells depends on carrageenan dosage and administration.
Area of Science:
- Immunology
- Pharmacology
- Cell Biology
Background:
- The mononuclear phagocyte system (MPS) plays a crucial role in immune surveillance and clearance of foreign particles.
- Carrageenan is a substance known to affect immune responses, but its precise impact on MPS activity requires further elucidation.
Purpose of the Study:
- To investigate the effects of carrageenan on the mononuclear phagocyte system (MPS).
- To assess the functional impairment of Kupffer cells and overall MPS activity following carrageenan administration.
Main Methods:
- Administration of carrageenan (5 mg) to induce effects on the MPS.
- Assessment of MPS activity through the hepatic phagocytosis of colloidal carbon and 51Cr-labelled sheep red blood cells (SRBC).
- Evaluation of dose-dependency, route of administration, and timing effects on carrageenan-induced MPS blockade.
Main Results:
- Carrageenan injection led to hepatosplenomegaly and thymic involution, indicating systemic effects.
- A temporary blockade of the MPS was observed, evidenced by reduced hepatic clearance of injected particles.
- Kupffer cell activity depression was dose-dependent and influenced by administration route and timing.
- Reduced hepatic uptake of SRBC correlated with increased SRBC localization in the spleen.
Conclusions:
- Carrageenan administration significantly impairs mononuclear phagocyte system (MPS) function, particularly Kupffer cell activity in the liver.
- The observed hepatosplenomegaly and thymic involution suggest a broader systemic immune response to carrageenan.
- Understanding carrageenan's impact on MPS is crucial for interpreting its effects in immunological and pharmacological contexts.
