Dose response of RU486 in a novel rabbit model of noninfectious preterm birth: Comparative efficacy of 3 routes of administration
| Autor: | Kay D. Beharry, Tamerou Asrat, Kenji C. Nishihara, Joshua Waltzman, Eileen Chang, David Gorenberg, Aamir Akmal |
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| Rok vydání: | 2005 |
| Předmět: |
medicine.medical_specialty
Hydrocortisone medicine.drug_class Injections Subcutaneous medicine.medical_treatment Injections Intramuscular Route of administration Pregnancy Internal medicine Animals Medicine Progesterone business.industry Abortifacient Agents Steroidal Obstetrics and Gynecology medicine.disease Disease Models Animal Mifepristone Steroid hormone Endocrinology Cytokine Cytokines Premature Birth Gestation Corticosteroid Female Rabbits business Injections Intraperitoneal Glucocorticoid medicine.drug |
| Zdroj: | American Journal of Obstetrics and Gynecology. 192:924-931 |
| ISSN: | 0002-9378 |
| DOI: | 10.1016/j.ajog.2004.11.061 |
| Popis: | Objective The purpose of this study was to examine whether the pregnant rabbit model can be used as a viable model for the study of non–infection-mediated preterm birth. Study design Timed pregnant New Zealand rabbits were injected with a single dose of RU486 on day 22 of gestation. Three doses (50 mg, 75 mg, and 100 mg) were administered intramuscularly, intraperitoneally, or subcutaneously. The rabbits were monitored for preterm delivery. Progesterone, cortisol, and cytokine levels were examined before the induction and after delivery. Uterine and cervical progesterone, cortisol, and cytokine levels were determined after delivery. Results RU486 resulted in 100% preterm delivery in all doses and modes of administration, compared with 0% of controls. Intramuscular administration appeared to generate the most favorable preterm delivery time. Rabbits that received 100 mg RU486 intramuscularly showed significantly decreased serum progesterone levels and uterine progesterone levels, compared with 100 mg subcutaneously and intraperitoneally. Conclusion RU486 that was administered intramuscularly appears to be a potent and effective method for inducing preterm birth. This model of hormonally mediated preterm birth might serve as a useful model for the investigation of the possible mechanisms of preterm labor. |
| Databáze: | OpenAIRE |
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