Evaluation of blood-testis barrier integrity in terms of adhesion molecules in nonobstructive azoospermia

Sevim Aydin (Lead / Corresponding author), Deniz Billur, Sule Kizil, Sinan Ozkavukcu, Ferda Topal Celikkan, Kaan Aydos, Esra Erdemli

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Blood–testis barrier (BTB) is critical for maintaining fertility. The integrity of tight junctions (TJs) provides restricted permeability of BTB. The aim of this study was to evaluate the relationship between BTB and Sertoli cells. Testicular sperm extraction (TESE) obtained from nonobstructive azoospermia (NOA) patients was examined: Group I (spermatozoa+) and Group II (spermatozoa−). The tissues were stained with haematoxylin eosin, periodic acid–Schiff and Masson's trichrome for Johnsen's score evaluation. Apoptosis and adhesion molecules such as claudin-11, occludin and ZO-1 were assessed. In Group I, the integrity of the seminiferous tubules was intact. In Group II, some seminiferous tubule walls were lined only with Sertoli cells, had a thickening of the basement membrane, and oedema in interstitial spaces. In Group I, the seminiferous tubule consisted of a stratified columnar epithelium, claudin-11 expressions were observed as linear staining in the basal zone of the tubule, while seminiferous tubules, with low epithelium, displayed a punctate type of staining. Immunohistochemical observations were consistent with the ultrastructural findings. In Group II, high apoptosis and unstained/irregular TJ formation in claudin-11, occludin and ZO-1 were observed. In conclusion, disruption of relation between BTB and TJs may reveal inadequate spermatogenesis, which is one of the mechanisms behind azoospermia.
Original languageEnglish
Article numbere13636
Number of pages8
Issue number7
Early online date26 May 2020
Publication statusPublished - 1 Aug 2020


  • blood-testis barrier (BTB)
  • claudin-11
  • occludin
  • tight junctions (TJs)
  • ZO-1


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