Octreotide inhibits myeloperoxidase activity in rat uterus

OBJECTIVE: Several studies have demonstrated that synthetic somatostatin-analog octreotide could affect the functions of the hypothalamus, anterior pituitary gland and ovary. To date, very few studies on the effect of octreotide on uterine function have been reported. We investigated the effects of octreotide on neutrophil functions in rat uterus. METHODS: Twenty Sprague-Dawley rats were subjected to a standardized uterine horn excision. To evaluate the effect of octreotide, the rats were assigned randomly to treatment (octreotide 20 microgr/kg, SC) and control groups. After two weeks relaparotomy was performed and contralateral uterine horns were excised in the same standardized manner. The excised segment was washed in cold saline solution and was frozen in liquid nitrogen immediately and homogenized. Myeloperoxidase (MPO) and elastase concentrations were determined in homogenates of uterine horns. The data were analyzed by Mann-Whitney U test. RESULTS: In octreotide-treated rats the MPO activity was significantly reduced after 14 days (14.79+/-2.08 versus 6.62+/-1.72 U/mg protein; p=0.012). There was also a significant difference in mean MPO levels between the two groups at the end of the experiment (6.62+/- 1.72 versus 18.56+/-2.49 U/mg protein; p=0.001). The octreotide administration did not affect elastase levels significantly. No differences were found in mean elastase levels in both groups after the treatment. CONCLUSION: This study demonstrates that octreotide has a significant effect on the neutrophil function in terms of MPO activity in rat uterus. Further studies are needed to clarify the clinical relevance of the inhibitory effect of octreotide in the uterus and the possibility of its applications.