Cell growth effects of leuprolide on cultured endometrioma cells.

OBJECTIVE: To examine the effect of the GnRH agonist leuprolide on the growth of cultured endometrioma cells. STUDY DESIGN: Experimental study in an academic setting on endometrioma cell lines cultured from 15 women undergoing laparoscopy or laparotomy for excision of endometrioma. RESULTS: Mean cell counts resulting from treatment with lower concentrations were not significantly different from those of the controls. Increasing concentrations of leuprolide resulted in inhibition of cell growth. The inhibitory effect of leuprolide was statistically significant when the 1,000 ng/mL concentration was compared with the control concentration. CONCLUSION: Increased concentrations of leuprolide has suppressive effects on the growth of cultured endometrioma cells. This suggests a direct effect of GnRH agonists acting via GnRH agonist receptors. Long-acting gonadotropin-releasing hormone (GnRH) agonists cause pituitary receptor down-regulation and ovarian suppression, a function that has made this class of agents useful for the treatment of endometriosis. Recent work has also revealed that this class of agents may also have a direct suppressive effect on peripheral target tissue, mediated by GnRH and GnRH agonist receptors. Preliminary work has suggested that there are GnRH receptors in endometriotic cells and that the growth of these cells is inhibited by GnRH agonists. This activity, however, has not been extensively studied in the growth of endometrioma cells. The present study evaluated the effect of the GnRH agonist leuprolide on 15 endometrioma cell lines.