Researcher:
Kocabay, Ahmet

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Ahmet

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Kocabay

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Kocabay, Ahmet

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2016 - 201962020 - 20227

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    Treatment with melatonin enhances the embryo quality and the development of vitrified/warmed eight cell mouse embryos by solid surface vitrification (SSV)
    (Cryo Letters, 2020) Caglar, Kubra; Arat, Sezen; N/A; N/A; Kocabay, Ahmet; Taşkın, Ali Cihan; Other; Other; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); N/A; N/A; 291296; N/A
    BACKGROUND: Melatonin is an endocrine hormone secreted from the pineal gland located outside the blood-brain barrier. OBJECTIVE: In this study, in vitro propagated eight-cell mouse embryos were vitrified by the Solid Surface Vitrification (SSV) method and after thawing, their in vitro development and embryo qualities in melatonin added media were investigated. METHODS: Pronuclear stage embryos obtained from super ovulated B6CBAF1/J strain mice, were cultured until the eight-cell stage. Then these eight-cell embryos were vitrified by the SSV method and after thawing, cultured in melatonin added media at 37 degrees C and 5 %CO2 conditions until the blastocyst stage. RESULT: In the experimental period, in vitro embryo development rates of the control, SSV and +10(-12) M melatonin groups were observed as 97%, 86% and 93%, respectively. CONCLUSION: Our results indicated that melatonin addition slightly increased the development rates and total cell numbers of embryos vitrified by the SSV method.
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    Intracytoplasmic sperm injection (ICSI) in B6D2F1 and CB6F1 strains mice using cauda epididymal spermatozoa
    (İstanbul Üniversitesi, 2021) Taşkın, Ali Cihan; N/A; Kocabay, Ahmet; Coşkun, Nilhan; Other; Other; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); N/A
    Objective: Reproductive biotechnology studies focus on the longterm storage of embryos (cryopreservation), embryo cultures, genome editing of embryos and embryo transfer. Micromanipulation techniques in reproduction biotechnologies have an important role, especially in studies investigating assisted reproductive technology in laboratory animals. The aim of the present study was to investigate the effect of epididymal spermatozoa injected to oocyte by intracytoplasmic sperm injection (ICSI) in different mice strains. In this study, we evaluated the in vitro development of post-ICSI derived embryos using cauda epididymal sperm. Material and Method: Female mice (8-10 weeks) were superovulated using pregnant mare serum gonadotropin/human chorionic gonadotropin (PMSG/hCG) and ~14h post hCG, the mice were sacrificed, and the oocytes were collected. Spermatozoa from the cauda epididymal of a 12-week-old were used on the same strain for ICSI and the in vitro developmental potential was evaluated. Finally, the embryos were cultured for 120 hours at 5% CO2 with 37°C. Results: The results showed that the two-cell embryo of the B6D2F1 strain (79.31%) was significantly higher than the CB6F1 (56.26%) (p0.05). Conclusion: ICSI using cauda epididymal sperm is a suitable application for in vitro embryo development in B6D2F1 and CB6F1 strains. Finally, ICSI success of the B6D2F1 mice strains was found to be higher than CB6F1 mice strains. / Amaç: Üreme biyoteknolojisi alanındaki çalışmalar; embriyoların uzun süre saklanması (kriyoprezervasyon), embriyo kültürü, embriyoların genom düzenlenmesi araştırmaları ve embriyo transferi gibi konular üzerinde yoğunlaşmaktadır. Üreme biyoteknolojilerinde mikromanipülasyon teknikleri, özellikle laboratuvar hayvanlarında yardımcı üreme teknolojisinin araştırıldığı çalışmalarda önemli bir yere sahiptir. Bu çalışmanın amacı, farklı fare ırklarında intrastoplazmik sperm enjeksiyonu (ICSI) ile epididimal spermatozoanın oosite enjeksiyonunu araştırmaktır. Bu çalışmada, kauda epididimal fare spermi kullanılarak yapılan ICSI uygulaması sonrasında elde edilen embriyoların in vitro gelişimi değerlendirilmiştir. Gereç ve Yöntem: Dişi fareler (8-10 hafta), gebe kısrak serum gonadotropini/insan koryonik gonadotropini (PMSG/hCG) kullanılarak süperovüle edilmiş, hCG'den ~14 saat sonra fareler sakrifiye edilerek oositler toplanmıştır. 12 haftalık erkek farenin kauda epididiminden alınan spermatozoa, aynı ırk oositle ICSI için kullanılmış ve in vitro gelişim potansiyeli değerlendirilmiştir. Son olarak tüm embriyolar 120 saat süre ile %5 CO2 ve 37°C’de kültüre edilmiştir. Bulgular: Sonuçlar, B6D2F1 (%79,31) ırkının 2 hücreli embriyo gelişiminin CB6F1 (%56,26) ırklı farelerdeki 2 hücreli embriyo gelişiminden önemli ölçüde yüksek olduğunu göstermiştir (p0,05). Sonuç: B6D2F1 ve CB6F1 fare ırklarında, kauda epididimal sperma kullanılarak yapılan ICSI in vitro embriyo gelişimi için uygun bir yöntemdir. Sonuç olarak, B6D2F1 farelerde ICSI’nın başarısı, CB6F1 ırk farelere göre daha yüksektir.
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    Construction of gel based 3D endometrial co -culture systems: can human mesenchymal stem cells be an alternative?
    (Oxford Univ Press, 2017) Yücel, D.; N/A; Karahüseyinoğlu, Serçin; Şahin, Gizem Nur; Şevgin, Kübra; Kocabay, Ahmet; Taşkın, Ali Cihan; Faculty Member; Master Student; PhD Student; Other; Other; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); School of Medicine; Graduate School of Health Sciences; Graduate School of Health Sciences; N/A; N/A; 110772; N/A; N/A; N/A; 291296
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    Polymeric and collagen biomaterials enhance implantation of mouse blastocysts in three-dimensional culture models
    (Elsevier, 2021) Başoz, Deniz; Yücel, Deniz; N/A; N/A; N/A; N/A; N/A; Department of Industrial Engineering; N/A; Ergün, Yağmur; Şahin, Gizem Nur; Şevgin, Kübra; Kocabay, Ahmet; Taşkın, Ali Cihan; Gönen, Mehmet; Karahüseyinoğlu, Serçin; PhD Student; PhD Student; PhD Student; Other; Other; Faculty Member; Faculty Member; Department of Industrial Engineering; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); Graduate School of Health Sciences; Graduate School of Health Sciences; Graduate School of Health Sciences; N/A; N/A; College of Engineering; School of Medicine; N/A; N/A; N/A; N/A; 291296; 237468; 110772
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    Celcular and molecular dynamics of in-vitro 2D and 3D cultured blastocysts throughout the implantation process
    (Amer Soc Cell Biology, 2016) Yucel, D.; N/A; Karahüseyinoğlu, Serçin; Şahin, Gizem Nur; Kocabay, Ahmet; Taşkın, Ali Cihan; Faculty Member; PhD Student; Other; Other; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); School of Medicine; Graduate School of Health Sciences; N/A; N/A; N/A; N/A; N/A; Koç University Hospital; 110772; N/A; N/A; 291296
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    In vitro blastocyst implantation model by the use of synthetic polymer foam scaffolds
    (Mary Ann Liebert, Inc, 2022) Başöz, Deniz; Yücel, Deniz; N/A; Ergün, Yağmur; Kocabay, Ahmet; Taşkın, Ali Cihan; Karahüseyinoğlu, Serçin; Master Student; Other; Other; Faculty Member; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); Graduate School of Health Sciences; N/A; N/A; School of Medicine; N/A; N/A; 291296; 110772
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    The study of exposure times and dose-escalation of tick saliva on mouse embryonic stem cell proliferation
    (TÜBİTAK, 2022) Ebrahimi, Ayyub; Taşkın, Ali Cihan; Kar, Sırrı; N/A; Kocabay, Ahmet; Other; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); N/A; N/A
    The saliva of ticks contains numerous bioactive molecules with anti-hemostatic and immunomodulatory properties. Due to their abilities of self-renewal and pluripotency, stem cells hold considerable promise in the regenerative medicine and biomedical fields. The present study examines the viability and proliferation of mouse embryonic stem cells (mESCs) following the addition of tick salivary gland extracts obtained from three tick species (Dermacentor marginatus, Rhipicephalus bursa and Hyalomma marginatum) to the mESC medium in different quantities (0.2, 2, 20, 40, 80, and 160 µg/ml). On days 2, 5 and 7 of the treatment, the vitality and proliferation of the cells were determined with CellTiter-Glo and morphological tests. The results showed that the culture supplemented with D. marginatus salivary gland extract at a concentration of 80 µg/ml positively affected the proliferation rate of mESC. It was further shown that all concentrations of the salivary gland extracts derived from H. marginatum and R. bursa had a negative effect on the proliferation rate of mESC when compared to the controls.
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    Effect of leptin on derivation rate of mouse embryonic stem (ES) cell line
    (Springer, 2016) N/A; N/A; N/A; N/A; Taşkın, Ali Cihan; Kocabay, Ahmet; Önder, Tamer Tevfik; Ebrahimi, Ayyub A.; Other; Other; Faculty Member; Researcher; N/A; N/A; School of Medicine; School of Medicine; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); N/A; N/A; 291296; N/A; 42946; 381072
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    Celcular and molecular dynamics of in-vitro 2D and 3D cultured blastocysts throughout the implantation process
    (Amer Soc Cell Biology, 2016) Yucel, D.; N/A; Karahüseyinoğlu, Serçin; Şahin, Gizem Nur; Kocabay, Ahmet; Taşkın, Ali Cihan; Faculty Member; PhD Student; Other; Other; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); School of Medicine; Graduate School of Health Sciences; N/A; N/A; N/A; N/A; N/A; Koç University Hospital; 110772; N/A; N/A; 291296
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    Effects of different parthenogenetic activation periods on mouse embryo development and quality
    (Afyon Kocatepe Üniversitesi Veterinerlik Fakültesi, 2020) N/A; N/A; N/A; Taşkın, Ali Cihan; Coşkun, Nilhan; Kocabay, Ahmet; Other; Other; Other; Koç University Research Center for Translational Medicine (KUTTAM); Koç University Research Center for Translational Medicine (KUTTAM); Koç University Research Center for Translational Medicine (KUTTAM); N/A; N/A; N/A; 291296; N/A; N/A
    In the present study we investigate the effects of parthenogenetic activation on in vitro embryo development and quality in different activation periods. oocytes were obtained 14 hours after human chorionic gonadotropin (hCG) injection from superovulated B6D2F1 female mice then parthenogenetic activation started 18 hours after hCG injection. The oocytes were activated at different activation periods for 3, 4, 5 or 6 hours in 10 mM strontium chloride (SrCl2)+ 5 μg/mL-1 Cytohalasine B (CB) + 5 nM Trichostatin A (TSA) containing a Ca 2+ free Chatot Ziomek Brinster (CZB) activation medium, followed by further incubation for two hours at 37°C and 5% CO2 in embryo culturing medium + TSA. The results in the present study suggested that the parthenogenetic activation of the 6 hour activation period was found to be higher than at 3, 4 and 5 hours. / Çalışmamızın amacı, partenogenetik aktivasyonda farklı aktivasyon sürelerinin in vitro embriyo gelişimi ve kalitesi üzerindeki etkilerinin araştırılmasıdır. Superovule B6D2F1 ırkı dişi farelere uygulanan insan koryonik gonadotropin (hCG) enjeksiyonundan 14 saat sonra oositler elde edildi ve 18 saat sonra partenogenetik aktivasyona başlandı. Oositler, 10 mM stronsiyum klorür (SrCl2) + 5 μg/mL-1 sitokalazin B (CB) + 5 nM trikostatin A (TSA) Ca 2+ içermeyen Chatot Ziomek Brinster (CZB) medyumu içerisinde 3, 4, 5 ve 6 saat bekletildi. Aktivasyon sonrası, embriyo kültür medyumu + TSA’da inkübatörde 37°C ve %5 CO2 ortamında 2 saat bekletildi. Son olarak, tüm embriyolar 120 saat süre ile kültüre edildi. Bu çalışmadan elde edilen sonuçlar göre, 6 saatlik partenogenetik aktivasyon başarısının, 3, 4 ve 5 saatlik sürelere göre daha yüksek olduğu saptandı.