title: Effect of a gonadotropin-releasing hormone analogue on cyclophosphamide-induced ovarian toxicity in adult mice.
abstract: OBJECTIVE
  To evaluate the possible protective effect of low and high dose of triptorelin, a GnRH analogue, on cyclophosphamide-induced ovarian toxicity in adult female mice.
  
  
  METHODS
  Thirty-six sexually mature, virgin, female mice were divided randomly into six groups of six each: control group, low-dose triptorelin (TL) group, high-dose triptorelin (TH) group, cyclophosphamide (CPA) group, low-dose triptorelin plus cyclophosphamide (TL + CPA) group and high-dose triptorelin plus cyclophosphamide (T + CPA) group. Mice in both the TL + CPA and the TH + CPA groups were injected with 3.8 and 38 mg/kg of triptorelin subcutaneously, respectively. Four weeks later, mice in the CPA, TL + CPA and TH + CPA groups were injected with cyclophosphamide, intraperitoneally, at a dose of 50 mg/kg. Ovaries were removed 4 weeks later and processed for light microscopic examinations.
  
  
  RESULTS
  Obvious destruction of ovarian structure and significant depletion of primordial, primary, secondary and antral follicles were demonstrated in the CPA group and compared with the control group, the difference was statistically highly significant (p < 0.001), affirming the ovarian toxicity of cyclophosphamide. In the TL + CPA group, there was a significant increase in primordial, primary, secondary and antral follicles compared with the CPA group (p < 0.05), showing the effect of triptorelin on ovarian protection. Regarding, the high-dose GnRH agonist the difference was statistically highly significant for primordial and primary follicles (p < 0.001).
  
  
  CONCLUSIONS
  This study has showed a dose-dependent protective effect of GnRH analogue on ovarian reserve against ovarian toxic chemotherapy, thus demonstrating an important role of GnRH analogues in fertility preservation.
authors.affiliation: Department of Obstetrics and Gynecology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt. tete5500@yahoo.com
authors.forename: Eman A Fouad
authors.initials: EA
authors.lastname: Kishk
authors.forename: Mona H
authors.initials: MH
authors.lastname: Mohammed Ali
mesh_terms: D000818:Animals; D018906:Antineoplastic Agents, Alkylating / Q000633:toxicity*; D003520:Cyclophosphamide / Q000633:toxicity*; D004305:Dose-Response Relationship, Drug; D005260:Female; D059247:Fertility Preservation; D007987:Gonadotropin-Releasing Hormone / Q000031:analogs & derivatives; D051379:Mice; D010053:Ovary / Q000187:drug effects / Q000473:pathology; D016649:Primary Ovarian Insufficiency / Q000139:chemically induced* / Q000473:pathology / Q000517:prevention & control*; D017329:Triptorelin Pamoate / Q000008:administration & dosage*
chemical_list: D018906:Antineoplastic Agents, Alkylating; D017329:Triptorelin Pamoate; D007987:Gonadotropin-Releasing Hormone; D003520:Cyclophosphamide