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Published on: November 10, 2011
The Kupffer cells. Ultrastructural and functional features
Abstract:
The Kupffer cells, as fixed macrophages, belong to the mononuclear phagocyte system (MPS), the former reticulo-endothelial system (RES). Their ultrastructure has some characteristics, i.e. ergastroplasmic peroxidase activity and worm-like structures, which allow a very sharp identification. Some particular "bridge-like" arrangements of Kupffer cells in the capillary lumen seem to provide them with a special ability of "trapping" the passing white blood cells. The important endocytotic function is analysed from the viewpoint of ultrastructural features, and with particular reference to the phagocytosis of damaged red blood cells. Several drugs and particulate substances acting as Kupffer cells stimulants are presented. This stimulation reaction concerns woth increased number and enhanced endocytotic activity. The origin and kinetics of Kupffer cells are discussed, with reference to own results which substantiate the theory of local proliferation and blood supply, the bone marrow being however the main source of hepatic macrophages. A few ultrastructural data on Kupffer cells involved in pathological processes are presented.
Insights
Kupffer cells, the liver's macrophages, have unique structures enabling efficient white blood cell trapping and phagocytosis. Their origin is primarily the bone marrow, with local proliferation also contributing to their numbers.
Area of Science:
- Hepatology
- Immunology
- Cell Biology
Background:
- Kupffer cells are fixed macrophages within the mononuclear phagocyte system (MPS).
- They possess unique ultrastructural features for identification, including ergastoplasmic peroxidase activity and worm-like structures.
- These cells play a crucial role in the liver's immune surveillance and homeostasis.
Purpose of the Study:
- To detail the ultrastructure and identification markers of Kupffer cells.
- To analyze the endocytotic function, particularly phagocytosis of damaged red blood cells.
- To investigate Kupffer cell stimulation by drugs and particulate substances, and discuss their origin and kinetics.
Main Methods:
- Ultrastructural analysis using electron microscopy.
- Observation of Kupffer cell interactions with blood cells in vivo.
- Evaluation of cellular responses to stimulant substances.
Main Results:
- Distinctive ultrastructural features allow precise Kupffer cell identification.
- "Bridge-like" arrangements facilitate the trapping of circulating white blood cells.
- Stimulation increases Kupffer cell number and endocytotic activity; bone marrow is the primary source, with local proliferation also occurring.
Conclusions:
- Kupffer cells exhibit specialized structures for immune functions like phagocytosis and cell trapping.
- Their response to stimulants involves proliferation and enhanced activity.
- Hepatic macrophages originate mainly from bone marrow, supplemented by local proliferation.
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