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Effect of RU-486 and related compounds on the proliferation of cultured macrophages
C P Roberts1, S Parthasarathy, R Gulati
1Department of Gynecology and Obstetrics, Emory University School of Medicine, Atlanta, GA 30322, USA.
Problem:
Macrophages are implicated in the pathophysiology of endometriosis and are influenced by anti-inflammatory steroids as well as anti-oxidants.
Methods:
We tested the effect of RU-486, an antiprogesterone, antiglucocorticoid and an antioxidant, on the proliferation of RAW macrophages.
Results:
The incorporation of 3H-thymidine was significantly inhibited by both progesterone and RU-486. Progesterone and RU-486, in combination, synergistically inhibited macrophage growth. In contrast, dexamethasone-stimulated growth was antagonized by RU-486 in a dose dependent manner. ZK 112,993 which is structurally related to RU-486 but lacks antioxidant properties, also inhibited thymidine incorporation. The synergistic effect of RU-486 and ZK 112,993 with progesterone implicate a mechanism of action separate from receptor bound antagonists. A cell permeable antioxidant, pyrrolidine dithiocarbamate was very effective in inhibiting the incorporation of 3H-thymidine into cells.
Conclusions:
These results suggest novel therapeutic modalities in the management of endometriosis via antiglucocorticoid as well as antioxidant mechanisms.
Insights
RU-486, an antiglucocorticoid and antioxidant, inhibits macrophage proliferation, suggesting new endometriosis treatments. Progesterone and RU-486 synergistically reduce macrophage growth, offering therapeutic potential.
Area of Science:
- Endocrinology
- Immunology
- Reproductive Biology
Background:
- Macrophages play a key role in endometriosis.
- Anti-inflammatory steroids and antioxidants influence macrophage activity.
Purpose of the Study:
- To investigate the effects of RU-486, an antiprogesterone, antiglucocorticoid, and antioxidant, on RAW macrophage proliferation.
- To explore potential therapeutic mechanisms for endometriosis management.
Main Methods:
- Assessing 3H-thymidine incorporation to measure macrophage proliferation.
- Testing the effects of progesterone, RU-486, dexamethasone, ZK 112,993, and pyrrolidine dithiocarbamate on macrophage growth.
Main Results:
- Progesterone and RU-486 significantly inhibited macrophage proliferation.
- RU-486 and progesterone exhibited synergistic inhibition of macrophage growth.
- RU-486 antagonized dexamethasone-stimulated growth, while ZK 112,993 also inhibited proliferation, suggesting mechanisms beyond receptor binding.
- A cell-permeable antioxidant, pyrrolidine dithiocarbamate, effectively inhibited macrophage proliferation.
Conclusions:
- RU-486 demonstrates potential therapeutic value in endometriosis management.
- Antiglucocorticoid and antioxidant properties of compounds like RU-486 offer novel treatment strategies for endometriosis.