Pharmacological concentrations of follicle-stimulating hormone and testosterone improve the efficacy of in vitro germ cell differentiation in men with maturation arrest

Jan Tesarik, Peter Nagy, Roger Abdelmassih, Ermanno Greco, Carmen Mendoza

Research output: Contribution to journalArticle

17 Citations (Scopus)


Objective: To examine whether in vitro differentiation of germ cells from men with maturation arrest is improved by augmenting FSH and T concentrations above the values effective in samples from men with normal spermatogenesis. Design: Prospective, controlled in vitro study. Setting: Private assisted reproduction centers and a university department. Patient(s): Men with meiotic or postmeiotic maturation arrest. Intervention(s): Testicular spermatid extraction, in vitro culture of testicular biopsy samples, intraoocyte injection of elongated spermatids, embryo culture and transfer. Main Outcome Measure(s): Progression of in vitro germ cell differentiation, fertilization, and pregnancy outcomes with in vitro cultured germ cells. Result(s): In some cases of meiotic and postmeiotic maturation arrest, more advanced germ cell stages were achieved by in vitro culture in the presence of 500 IU/L FSH as compared with 50 IU/L FSH. The beneficial effect of 500 IU/L FSH was further potentiated by a simultaneous increase of T concentration from 1 to 10 μM. Fertilizations with germ cells recovered after incubation with these pharmacological hormone concentrations gave rise to viable embryos and the births of five healthy babies. Conclusion(s): Pharmacological concentrations of FSH and T are beneficial for in vitro maturation of germ cells from some men with in vivo maturation arrest.

Original languageEnglish
Pages (from-to)245-251
Number of pages7
JournalFertility and Sterility
Issue number2
Publication statusPublished - Jan 31 2002



  • FSH
  • In vitro spermatogenesis
  • Maturation arrest
  • Nonobstructive azoospermia
  • Testosterone

ASJC Scopus subject areas

  • Reproductive Medicine
  • Obstetrics and Gynaecology

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