title: Telomerase activity and expression of telomerase subunits in the testicular tissue of infertile patients.
abstract: OBJECTIVE
  Determination of telomerase activity and the expression of human telomerase RNA (hTR) and human telomerase reverse transcriptase (hTERT) in the testicular tissue of patients with infertility arising from various causes.
  
  
  METHODS
  Prospective observational study.
  
  
  METHODS
  A university hospital.
  
  
  METHODS
  Thirty-three patients with azoospermia arising from various causes. There were 12 testicular biopsy specimens from patients with Sertoli cell-only syndrome, 9 from patients with maturation arrest, and 12 from patients with obstructive azoospermia and normal histologic findings.
  
  
  METHODS
  Thirty-three testicular biopsies.
  
  
  METHODS
  Correlation of histologic findings at testicular biopsy with telomerase activity, hTERT, and hTR.
  
  
  RESULTS
  All 12 biopsy specimens from patients with obstructive azoospermia were positive for telomerase activity, hTR, and hTERT. Biopsy specimens from the 9 patients with maturation arrest were positive for telomerase activity in 8 cases, hTR in 9 cases, and hTERT in 5 cases. None of the patients with Sertoli cell-only syndrome showed either telomerase activity or hTERT, but all of them showed hTR.
  
  
  CONCLUSIONS
  Telomerase activity and evidence of hTERT in testicular tissue are highly sensitive and highly specific markers of gametogenesis, which could gain in importance as part of the fertility workup before microinjection procedures.
authors.affiliation: Freie Universität Berlin, Berlin, Germany. schrader@medizin.fu-berlin.de
authors.forename: M
authors.initials: M
authors.lastname: Schrader
authors.forename: M
authors.initials: M
authors.lastname: Müller
authors.forename: R
authors.initials: R
authors.lastname: Heicappell
authors.forename: H
authors.initials: H
authors.lastname: Krause
authors.forename: W
authors.initials: W
authors.lastname: Schulze
authors.forename: K
authors.initials: K
authors.lastname: Miller
mesh_terms: D004268:DNA-Binding Proteins; D005640:Follicle Stimulating Hormone / Q000097:blood; D006801:Humans; D007248:Infertility, Male / Q000201:enzymology* / Q000473:pathology / Q000503:physiopathology; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D009845:Oligospermia / Q000201:enzymology; D011446:Prospective Studies; D012313:RNA; D012708:Sertoli Cells / Q000473:pathology; D013091:Spermatogenesis; D019098:Telomerase / Q000378:metabolism*; D013737:Testis / Q000201:enzymology* / Q000473:pathology; D013739:Testosterone / Q000097:blood
chemical_list: D004268:DNA-Binding Proteins; C422952:telomerase RNA; D013739:Testosterone; D012313:RNA; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D019098:Telomerase