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Updated: Aug 15, 2026
Depletion and Reconstitution of Macrophages in Mice
Published on: August 1, 2012
LPS-induced decrease of specific binding of 3H-dexamethasone to peritoneal macrophages of C57BL/6 mice
Abstract:
The effect of LPS on the specific binding of 3H-dexamethasone to peritoneal macrophages of C57BL/6 mice was studied. Scatchard plot of the specific binding of 3H-dexamethasone to the macrophages indicated that the Kd and Ro of glucocorticoid receptor was approximately 3.0 nM and 5,500 binding sites per cell, respectively. LPS, at the concentration of 10 ug/ml, caused a decrease in the specific binding of 3H-dexamethasone to macrophages after it interacted with the macrophages for different times. Con A, a mitogen for lymphocytes, did not significantly cause a decrease of glucocorticoid receptor in the macrophages at the concentration of 10 ug/ml. Our results indicated that the effect of LPS on the specific binding of 3H-dexamethasone to macrophages was different from the effect of Con A, which might be significant in the interaction of immune system and neuroendocrine system.
Insights
Lipopolysaccharide (LPS) reduces the binding of 3H-dexamethasone to mouse macrophages, unlike Concanavalin A (Con A). This suggests LPS impacts glucocorticoid receptors, potentially influencing immune and neuroendocrine system interactions.
Area of Science:
- Immunology
- Neuroendocrinology
- Pharmacology
Background:
- Glucocorticoids are crucial for immune regulation.
- Macrophages play a key role in immune responses.
- The interaction between the immune and neuroendocrine systems is complex.
Purpose of the Study:
- To investigate the effect of lipopolysaccharide (LPS) on glucocorticoid receptor binding in mouse peritoneal macrophages.
- To compare the effects of LPS and Concanavalin A (Con A) on glucocorticoid receptor expression.
Main Methods:
- Primary peritoneal macrophages were isolated from C57BL/6 mice.
- Specific binding of 3H-dexamethasone to macrophages was measured.
- Scatchard analysis was used to determine receptor characteristics (Kd and R0).
- Macrophages were treated with LPS or Con A at 10 ug/ml for varying durations.
Main Results:
- Scatchard analysis revealed a Kd of approximately 3.0 nM and 5,500 binding sites per cell for the glucocorticoid receptor.
- LPS treatment significantly decreased 3H-dexamethasone binding to macrophages.
- Con A treatment did not significantly alter glucocorticoid receptor binding at the tested concentration.
Conclusions:
- LPS, but not Con A, downregulates glucocorticoid receptor binding in mouse macrophages.
- These findings highlight a differential effect of LPS and Con A on macrophage glucocorticoid receptors.
- The observed effect of LPS may be significant for understanding immune-neuroendocrine system crosstalk.
