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The therapeutic effect of sustained-release microspheres of a potent LHRH agonist (leuprorelin acetate) on experimental endometriosis in female rats was examined histologically. Endometriosis was produced in rats by autotransplantation of endometrial tissue obtained from the left uterine horn into the renal subcapsular space. In the nontreated rats, the transplants were well established and had formed large cysts containing fluid. The walls of the cysts were composed of epithelium and stroma resembling that of normal endometrium. In the rats which received the microspheres of leuprorelin acetate, growth of the transplant was markedly suppressed as evidenced by the reduced size of the cystic cavity and the flattened and pyknotic epithelium. Also, the uterine and ovarian weight decreased significantly. In the ovariectomized rats, growth of the transplant was also markedly suppressed, and the uterine weight decreased. The present results clearly indicate that a single injection of the sustained-release microspheres of leuprorelin acetate markedly suppresses growth of the transplant and produces uterine and ovarian atrophy in the rats.

endocrinologia japonica

Histological Studies on the Therapeutic Effect of Sustained-Release Microspheres of a Potent LHRH Agonist (Leuprorelin Acetate) in an Experimental Endometriosis Model in Rats.