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Journals / Kocatepe Veteriner Dergisi / 2026 / Cilt: 19 Sayı: 3

Effects of Opti-MEM®-based maturation and stage-specific glucose supplementation on ovine embryo development in vitro

Opti-MEM® temelli oosit matürasyonu ve evreye özgü glikoz takviyesinin koyun embriyolarının in vitro gelişimi üzerine etkileri

Selin Yağcioğlu(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE)0000-0002-9355-498X
Ramazan Arıcı(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE)0000-0002-2236-2526
Gül Bakirer Ozturk(ISTANBUL UNIVERSITY, AZIZ SANCAR INSTITUTE OF EXPERIMENTAL MEDICINE)0000-0003-0185-8239
Israa Faris(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE)0000-0002-4890-9892
Ahmet Eser(SIIRT UNIVERSITY)0000-0003-1326-2678
Kamber Demir(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE)0000-0002-4561-6189
Mithat Evecen(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE, VETERINARY MEDICINE PR.)0000-0002-0219-6997
Sema Birler(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE)0000-0001-5069-5427
Serhat Pabuccuoğlu(ISTANBUL UNIVERSITY-CERRAHPASA, FACULTY OF VETERINARY MEDICINE)0000-0002-6200-3018
Pages
289–304
Publication Date
2026-09-15
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AI Summary & Key Takeaways

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

These findings demonstrate that while Opti-MEM® supports ovine oocyte nuclear maturation comparably to TCM-199, optimal blastocyst development requires stage-specific glucose supplementation tailored to the maturation medium employed.

📌 3 Key Takeaways

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Objective & Hypothesis:In vitro embryo production (IVEP) in sheep remains constrained by suboptimal in vitro maturation (IVM) and culture conditions.
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Key Findings & Data:Cumulus–oocyte complexes (COCs) recovered from slaughterhouse-derived ovaries were matured for 24 h in either TCM-199 or Opti-MEM®, both supplemented with hormones and serum.
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Conclusion & Impact:These findings demonstrate that while Opti-MEM® supports ovine oocyte nuclear maturation comparably to TCM-199, optimal blastocyst development requires stage-specific glucose supplementation tailored to the maturation medium employed.
🔬Design:Araştırma Makalesi
📍Scope:Comprehensive Sample
⚙️Variables:blastosist gelişimi · embriyo kültürü · glikoz ilavesi

Abstract

In vitro embryo production (IVEP) in sheep remains constrained by suboptimal in vitro maturation (IVM) and culture conditions. This study evaluated Opti-MEM® as an alternative IVM medium for ovine oocytes and investigated the effects of stage-specific glucose supplementation on embryonic development and blastocyst quality. Cumulus–oocyte complexes (COCs) recovered from slaughterhouse-derived ovaries were matured for 24 h in either TCM-199 or Opti-MEM®, both supplemented with hormones and serum. Following in vitro fertilization, embryos were cultured in a two-step synthetic oviduct fluid medium supplemented with amino acids (SOFaa) under two glucose strategies: glucose-free medium transitioning to 1.5 mM (G0→G1.5), or 1.5 mM transitioning to 3.0 mM glucose (G1.5→G3.0). Development was monitored through Day 8, and blastocyst quality was assessed by differential staining of inner cell mass (ICM) and trophectoderm (TE) cells. Nuclear maturation rates were comparable between groups, with metaphase II rates of 74.62% and 66.66% in TCM-199 and Opti-MEM®, respectively (p>0.05). Embryo development was significantly influenced by both IVM medium and glucose supplementation strategy. The G1.5→G3.0 protocol yielded superior blastocyst formation and quality, with the highest blastocyst rate and ICM cell count recorded in the TCM-199 group (p<0.05). Conversely, early glucose deprivation reduced blastocyst yield, particularly in Opti-MEM®-derived embryos. These findings demonstrate that while Opti-MEM® supports ovine oocyte nuclear maturation comparably to TCM-199, optimal blastocyst development requires stage-specific glucose supplementation tailored to the maturation medium employed.

Özet

Koyunlarda in vitro embriyo üretimi, yetersiz in vitro matürasyon (İVM) ve kültür koşulları nedeniyle kısıtlı kalmaktadır. Bu çalışmada, Opti-MEM®'in alternatif bir İVM ortamı olarak kullanılabilirliği ve aşamalı glikoz takviyesinin embriyonik gelişim ile blastosist kalitesi üzerine etkileri araştırıldı. Mezbaha kaynaklı ovaryumlardan elde edilen kumulus-oosit kompleksleri, hormon ve serum içeren TCM-199 veya Opti-MEM® ortamında 24 saat matüre edildi. İn vitro fertilizasyonun ardından embriyolar, iki farklı glikoz stratejisi uygulanan amino asit içeren sentetik ovidukt sıvısı (SOFaa) ortamında kültüre edildi: glikossuz ortamdan 1,5 mM glikoza geçiş (G0→G1,5) veya 1,5 mM'den 3,0 mM'e geçiş (G1,5→G3,0). Embriyonik gelişim 8. güne kadar izlendi; blastosist kalitesi, iç hücre kitlesi ve trofektoderm hücrelerinin diferansiyel boyanmasıyla değerlendirildi. Nükleer matürasyon oranları gruplar arasında benzer bulundu; metafaz II oranları TCM-199 ve Opti-MEM® gruplarında sırasıyla %74,62 ve %66,66 olarak saptandı (p>0,05). Embriyonik gelişim hem İVM ortamından hem de glikoz takviye stratejisinden anlamlı düzeyde etkilendi. G1,5→G3,0 protokolü üstün blastosist oluşumu ve kalitesi sağladı; en yüksek blastosist oranı ve iç hücre kitlesi hücre sayısı TCM-199 grubunda elde edildi (p<0,05). Erken dönem glikoz eksikliği blastosist verimini olumsuz etkiledi; bu etki Opti-MEM® kaynaklı embriyolarda daha belirgin gözlemlendi. Sonuç olarak, Opti-MEM® koyun oositlerinde nükleer matürasyonu TCM-199 ile karşılaştırılabilir düzeyde destekledi; ancak optimum blastosist gelişimi, matürasyon ortamına uygun aşamalı glikoz takviyesi gerektirdi.

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Cite This Article

Yağcioğlu, S., Arıcı, R., Ozturk, G. B., Faris, I., Eser, A., Demir, K., Evecen, M., Birler, S., Pabuccuoğlu, S. (2026). Effects of Opti-MEM®-based maturation and stage-specific glucose supplementation on ovine embryo development in vitro. Kocatepe Veteriner Dergisi, Cilt: 19 Sayı: 3, 289–304. https://doi.org/10.30607/kvj.1967570

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