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Macrophage-conditioned media enhance endometrial stromal cell proliferation in vitro
D L Olive1, I Montoya, R M Riehl
1Department of Obstetrics and Gynecology, University of Texas Health Science Center, San Antonio.
Abstract:
It has been hypothesized that the activated peritoneal macrophages of endometriosis, rather than being a response to ectopic endometrium, may contribute to its pathogenesis. This study attempts to define the effect of macrophage-derived growth factors on endometrial stromal cell growth in vitro, as well as the interaction between estrogen and these growth factors. Mouse endometrial stromal cells were prepared and cultured in either a serum-containing, insulin-free medium or a serum-free, insulin-containing medium, and the effects of adding 10% macrophage-conditioned medium on [3H]thymidine incorporation were assessed. Results indicate that macrophage-conditioned medium will increase incorporation in the presence of insulin but not in insulin-free media. Serum can substitute for macrophage-conditioned medium, but the two together show no additive or synergistic effect. The effect of estrogen on this system was determined, and results indicate that estrogen will perform the function of insulin, with an optimal concentration of 10(-10) to 10(-12) mol/L. Thus macrophage-conditioned medium appears to function as a competence growth factor, and estrogen (in appropriate concentrations) functions as a progression growth factor.
Insights
Activated peritoneal macrophages may drive endometriosis. Macrophage-conditioned medium, like insulin, promotes endometrial stromal cell growth, with estrogen acting similarly at specific concentrations.
Area of Science:
- Reproductive biology
- Cell biology
- Immunology
Background:
- Endometriosis pathogenesis is complex, with activated peritoneal macrophages potentially playing a key role beyond a mere response to ectopic endometrial tissue.
- Understanding the interaction between immune cells and endometrial cells is crucial for elucidating disease mechanisms.
Purpose of the Study:
- To investigate the influence of macrophage-derived growth factors on endometrial stromal cell proliferation in vitro.
- To explore the synergistic or additive effects of macrophage-conditioned medium and serum on cell growth.
- To define the role of estrogen in modulating these growth factor-mediated effects.
Main Methods:
- Primary mouse endometrial stromal cells were cultured in various media conditions (serum-containing/insulin-free vs. serum-free/insulin-containing).
- Macrophage-conditioned medium was added to assess its impact on [3H]thymidine incorporation, a measure of cell proliferation.
- The effect of varying estrogen concentrations on cell growth was evaluated.
Main Results:
- Macrophage-conditioned medium significantly increased [3H]thymidine incorporation in the presence of insulin, but not in insulin-free media.
- Serum could substitute for macrophage-conditioned medium, but no additive or synergistic effects were observed when used together.
- Estrogen mimicked the effect of insulin, with optimal activity observed at concentrations between 10(-10) and 10(-12) mol/L.
Conclusions:
- Macrophage-conditioned medium acts as a competence growth factor for endometrial stromal cells.
- Estrogen functions as a progression growth factor in this system, particularly at specific physiological concentrations.
- These findings suggest a potential mechanism by which immune cells and hormones contribute to endometriosis progression.