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Neopterin release from human endothelial cells is triggered by interferon-gamma
S E Andert1, A Griesmacher, A Zuckermann
1Second Department of Surgery, University of Vienna, Austria.
Clinical and Experimental Immunology
|June 1, 1992
Summary
Human umbilical vein endothelial cells (HUVEC) can produce neopterin, an immune system activation marker. Interferon-gamma (IFN-gamma) stimulated this production, suggesting endothelial cells contribute to elevated neopterin levels during infections or transplant rejection.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Neopterin is a biochemical marker indicating immune system activation.
- Elevated neopterin levels are observed in patients experiencing infections or transplant rejection.
- Monocytes and macrophages are known producers of neopterin.
Purpose of the Study:
- To investigate the capacity of human umbilical vein endothelial cells (HUVEC) to produce neopterin.
- To determine if various immune stimulatory agents can induce neopterin production in HUVEC.
Main Methods:
- Primary human umbilical vein endothelial cells (HUVEC) were cultured.
- HUVEC were stimulated with a panel of cytokines and mitogens, including Interferon-gamma (IFN-gamma), IL-1 alpha, IL-2, IL-6, tumor necrosis factor-alpha, granulocyte/macrophage colony-stimulating factor, phytohemagglutinin, and concanavalin A.
- Neopterin production by HUVEC was measured following stimulation.
Main Results:
- Interferon-gamma (IFN-gamma) significantly induced neopterin release from HUVEC.
- The neopterin release induced by IFN-gamma was both time- and dose-dependent.
- Other tested cytokines and mitogens did not elicit a significant neopterin response from HUVEC.
Conclusions:
- Human umbilical vein endothelial cells (HUVEC) possess the ability to synthesize neopterin.
- Interferon-gamma (IFN-gamma) is a potent stimulator of neopterin production in endothelial cells.
- Endothelial cells may contribute to elevated serum neopterin levels observed in clinical conditions such as infections and transplant rejection, alongside immune cells like monocytes and macrophages.