Journals / Medical Network Klinik Bilimler ve Doktor / 2001 / Cilt: 7 - Sayı: 5

Microscopic tese in nonobstructive azoospermia cases: Comparison of mechanical and enzymatic extraction procedures

Nonobstrüktif azoospermi olgularında mikroskopik tese: Mekanik ve enzimatik ayrıştırma yöntemlerinin karşılaştırılması

Pages
636–640
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

In conclusion, we believe that in non-obstructive azoospermia cases when spermatozoa was not found by mechanical extraction technique, to continue the procedure with enzymatic digestion procedure yields more spermatozoa to be used in ICSI.

📌 3 Key Takeaways

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Objective & Hypothesis:In 153 infertile patients with diagnosis of non-obstructive azoospermia secondary to primary testicular failure, microdissection testicular sperm extraction (TESE) was performed.
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Key Findings & Data:In 55 of them (36%) at least one spermatozoa was obtained by mechanical extraction technique.
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Conclusion & Impact:In conclusion, we believe that in non-obstructive azoospermia cases when spermatozoa was not found by mechanical extraction technique, to continue the procedure with enzymatic digestion procedure yields more spermatozoa to be used in ICSI.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Sperm sayısı · Germ hücreleri · Sperm

Abstract

In 153 infertile patients with diagnosis of non-obstructive azoospermia secondary to primary testicular failure, microdissection testicular sperm extraction (TESE) was performed. In 55 of them (36%) at least one spermatozoa was obtained by mechanical extraction technique. In the remaining 98 patients with no spermatozoa was found by mechanic extraction, testicular tissue suspension were subjected to enzymatic digestion procedure placing in incubating medium containing 25 mg/ml Dnase to prevent clotting of the resulting cell suspension due to the release free DNA from dead cells, and 2.6 mg of collagenase type IV. In 19 (19%) at least one spermatozoa was found. In addition to its role in dissociation of collagen fibers in the lamina propria, collagenase may play a role in the translocation of germ cells and releasing of mature spermatozoa into the lumen of the seminiferous tubules during spermiation, and by that way, enzymatic digestion by collagenase could be superior to mechanical extraction for better cell retrieval. However, detailed investigation of the possible effects of the enzymes using in this procedure, on the fertilization capacities of germ cells is necessary. In conclusion, we believe that in non-obstructive azoospermia cases when spermatozoa was not found by mechanical extraction technique, to continue the procedure with enzymatic digestion procedure yields more spermatozoa to be used in ICSI.

Özet

İnfertilite yakınması ile başvuran ve yapılan tetkikleri neticesi primer testiküler yetmezliğe bağlı non-obstrüktif azoospermi tanısı konan 153 olguya mikroskopik testiküler sperm ekstraksiyonu (TESE) yapıldı. Bunların 55'inde (% 36) mekanik ayrıştırma ile en az bir spermatozoa elde edilebildi. Hücre bulunamayan 98 olguda ise hücre süspansiyonları daha sonra %1 HSA içeren HEPES'li Earle's mediumu içine, ölü hücrelerden açığa çıkacak serbest DNA'ya bağlı hücre süspansiyonundaki pıhtılaşmayı önlemek amacıyla 25 mg/ml Dnase ve 2.6 mg kollajenaz tip IV konularak hazırlanmış enzim solüsyonu içerisinde muamele edilerek tekrar spermatozoa araştırıldı. 19'unda (%19) daha en az bir spermatozoa bulunduğu görüldü. Kollajenazın lamina propriadaki kollagen liflerini ayrıştırıcı etkisi yanısıra, germ hücrelerinin germinal epitel içerisinde yer değiştirmesinde ve spermiasyon sırasında matür spermatozoaların lümene salınmasındaki rolü nedeniyle, mekanik ayrıştırmaya göre daha fazla hücre elde edilmesini sağla ması mümkündür. Ancak, kullanılan enzimlerin germ hücrelerinin fertilizasyon kapasiteleri üzerine etkilerinin geniş olarak araştırılması gerekmektedir. Sonuç olarak, non-obstrüktif azoospermi olgularında, mekanik ayrıştırma ile TESE yapılan olgularda spermatozoa bulunamaması durumunda işleme enzimatik ayrıştırma yöntemi ile devam edilmesinin ICSI'de kullanılmak üzere daha fazla hücre bulunmasını sağlayabileceği kanısına varılmıştır.

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Cite This Article

AYDOS, K. (2001). Microscopic tese in nonobstructive azoospermia cases: Comparison of mechanical and enzymatic extraction procedures. Medical Network Klinik Bilimler ve Doktor, Cilt: 7 - Sayı: 5, 636–640. https://ajindex.com/articles/279203

References (13)

  1. Palermo G, Joris H, Devroey P, Van Steirteghem A: Pregnancies after intracytoplasmic injection of single spermatozoan into an oocyte. Lancet 1992, 340; 17-18.
  2. Tournaye H, Devroey P, Liu J, et al: Microsurgical epididymal sperm aspiration and intracytoplasmic sperm injection: a new effective approach to infertility as a result of congenital absence of the vas deferens. Fertil Steril 1994, 61: 1045-1051.
  3. Schoysman R, Vanderzwalmen P, Nijs M, et al: Pregnancy after fertilisation with human testicular spermatozoa. Lancet 1993, 342: 1237. Schlegel PN: Sperm retrieval techniques for assisted reproduction. Inf Reprod Med Clin North Am 1999, 10: 539-554.
  4. Tournaye H, Camus M, Vandervorst M, et al: Sperm retrieval for ICSI. Int J Androl 1997,20: 69-73.
  5. Devroey P, Liu J, Nagy Z, et al: Normal fertilization of oocytes after testicular sperm extraction and intracytoplasmic sperm injection (TESE and ICSI). Fertil Steril 1994, 62: 639-641.
  6. Crabbe E, Verheyen G, Tournaye H, Van Steirteghem A: The use of enzymatic procedures to recover testicular germ cells. Hum Reprod 1997, 12: 1682-1687.
  7. Blanchard Y, Lavault MT, Quernee D, et al: Preparation of spermatogenic cell populations at specific stages of differentiation in the human. Mol Reprod Dev 1991, 30: 275-282.
  8. Aslam I, Robins A, Dowel K, Fishel S: Isolation, purification and assessment of viability of spermatogenic cells from testicular biopsies of azoospermic men. Hum Reprod 1998, 13: 639-645.
  9. Salzbrunn A, Benson DM, Holstein AF, Schulze W: A new concept for the extraction of testicular spermatozoa as a tool for assisted fertilisation (ICSI).Hum Reprod 1996,11: 752-755.
  10. Kenmochi T, Miyamoto M, Une S, et al: Improved quality and yield of islets isolated from human pancreata using a two-step digestion method. Pancreas 2000,20:184-190.
  11. Ezeh UIO, Moore HDM, Cooke ID: A prospective study of multiple needle biopsies versus a single open biopsy for testicular sperm extraction, in men with non-obstructive azoospermia. Hum Reprod 1998,13: 3075-3080.
  12. Aslam I, Fishel S: Short-term in-vitro culture and cryopreservation of spermatogenic cells used for human in-vitro conception. Hum Reprod 1998, 13: 634-638. Silber S: The treatment of azoospermia with surgery and ICSI. In: Male fertility and infertility. Glover TD, Barratt LR (eds). Cambridge, Cambridge University Press, 1999.
  13. Vanderzwalmen P, Zech H, Birkenfeld A, Yemini M, et al: Intracytoplasmic injection of spermatids retrieved from testicular tissue: influence of testicular patho