Prematür ovaryan yetmezliği modelinde asprosinin folikül gelişimine etkisinin araştırılması
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Date
2024-07-12
Authors
Adalı, Bahar Pomak
Journal Title
Journal ISSN
Volume Title
Publisher
Bursa Uludağ Üniversitesi
Abstract
Prematüre over yetmezliği (POI), hipoöstrojenik ve hipergonadotropik amenore ile karakterize, 40 yaşından önce bireylerin normal yumurtalı kfonksiyonlarını kaybettiği, subfertilite/infertilite ile sonuçlanan patolojik birdurumdur. Günümüzde kullanılan hormon replasman tedavisinin, ovaryum fonksiyonlarını normale döndürmede yetersiz kalması ve kanser riski gibi yan etkileri nedeniyle alternative tedavi arayışları sürmektedir. Beyaz yağ dokusunda eksprese edilen adipokinlerin dişi ve/veya erkek bireylerde fertilite üzerinde etkilerinin olduğu bilinmektedir. Asprosin, glukojenik ve oreksijenik etkili bir adipokindir. “Asprosin, dişifertilitesini olumsuz etkileyen POI’de azalmış ovaryan rezervini, ovaryum folükülllerinin gelişimi uyararak arttırır” hipotezinin test edilebilmesi için planlanan bu çalışmada, asprosinin POI’de azalan ovaryum rezervini ve bozulan ovaryan folükül gelişimini etkileyip etkilemediğinin gösterilmesi amaçlanmıştır. Bu amaç doğrultusunda 4-vinilsikloheksen diepoksit (VCD) ile oluşturulan POI sıçan modelinde asprosinin etkisi, histolojik, immünohistokimyasal ve biyokimyasal yöntemlerle değerlendirildi. 60 günlük deneklere, 8 hafta boyunca intraperitonealyolla asprosin (500 ng/kg/gün) ya da serum fizyolojik verildi. 1. ,15. ve 71. Günlerde alınan kan örneklerinde serum AMH ve östrojen konsantrasyonları ölçüldü. Deneklerin ovaryumlarından hazırlanan ve hematoksilen-eosin ile PCNA ile boyanan kesitlerde ovaryan foliküller sayıldı, granülosa hücre proliferasyonu değerlendirildi. Biyokimyasal bulgular, POI oluşturulan deneklere göre AMH ve östrojen konsantrasyonlarının asprosin uygulanması ile anlamlı olarak yükseldiğini; histolojikve immünohistokimyasal bulgular ise asprosinin, primordial foliküllerin yanı sıragelişmekte olan folikül sayılarında ve granülosa hücrelerinin proliferasyonunda anlamlı artışa neden olduğunu gösterdi.Sonuç olarak çalışmamız, asprosinin, primordial foliküllerin aktivasyonuna neden olarak over rezervini ve folikül gelişimini olumlu yönde etkilediğini gösterdi. Bu bağlamda çalışmamızın asprosinin, primordial foliküllerin aktivasyonunu vefolikül gelişmini etkileyen çeşitli faktörlerin ve mekanizmalar üzerindeki araştırılacağı yeni çalışmalara öncülük edeceğini düşünmekteyiz.
Premature ovarian insufficiency (POI) is a pathological condition characterized by hypoestrogenic and hypergonadotropic amenorrhea, whereindividuals lose normal ovarian functions before the age of 40, resulting in subfertilityor infertility. The search for alternative treatments continues due to the inability ofcurrently used hormone replacement therapy to normalize ovarian functions and sideeffects such as cancer risk. Adipokines expressed in white adipose tissue are known tohave effects on fertility in female and/or male individuals. Adipokines expressed inwhite adipose tissue are known to have effects on fertility in female and/or maleindividuals. T his study, planned to test the hypothesis that "Asprosin increases thedecreased ovarian reserve in POI, which negatively affects female fertility, bystimulating the development of ovarian follicles", was aimed to show whether asprosinaffects the decreased ovarian reserve and impaired ovarian follicle development in POI. For this purpose, the effect of asprosin on the 4-vinylcyclohexene diepoxide (VCD)-induced POI rat model was evaluated by histological, immunohistochemicaland biochemical methods. Sixty-day-old rats were intraperitoneally given asprosin (500 ng/kg/day) or physiological saline for 8 weeks. Serum AMH and estrogenconcentrations were measured in blood samples taken on the 1st, 15th and 71st day. Ovarian follicles were counted and granulosa cell proliferation was evaluated on thesections which were prepared from the ovaries of the rats and stained withhematoxylin-eosin or PCNA,. Biochemical findings showed that AMH and estrogenlevels were increased significantly with asprosin administration compared to POIgroup; histological and immunohistochemical findings showed that asprosin caused asignificant increase in the number of developing follicles as well as primordial folliclesand the proliferation of granulosa cells.In conclusion, our study showed that asprosin positively affects ovarian reserveand follicle development by causing activation of primordial follicles. In this context,we think that our study will lead to new studies in which asprosin will be investigated on various factors and mechanisms affecting the activation of primordial follicles and follicle development.
Premature ovarian insufficiency (POI) is a pathological condition characterized by hypoestrogenic and hypergonadotropic amenorrhea, whereindividuals lose normal ovarian functions before the age of 40, resulting in subfertilityor infertility. The search for alternative treatments continues due to the inability ofcurrently used hormone replacement therapy to normalize ovarian functions and sideeffects such as cancer risk. Adipokines expressed in white adipose tissue are known tohave effects on fertility in female and/or male individuals. Adipokines expressed inwhite adipose tissue are known to have effects on fertility in female and/or maleindividuals. T his study, planned to test the hypothesis that "Asprosin increases thedecreased ovarian reserve in POI, which negatively affects female fertility, bystimulating the development of ovarian follicles", was aimed to show whether asprosinaffects the decreased ovarian reserve and impaired ovarian follicle development in POI. For this purpose, the effect of asprosin on the 4-vinylcyclohexene diepoxide (VCD)-induced POI rat model was evaluated by histological, immunohistochemicaland biochemical methods. Sixty-day-old rats were intraperitoneally given asprosin (500 ng/kg/day) or physiological saline for 8 weeks. Serum AMH and estrogenconcentrations were measured in blood samples taken on the 1st, 15th and 71st day. Ovarian follicles were counted and granulosa cell proliferation was evaluated on thesections which were prepared from the ovaries of the rats and stained withhematoxylin-eosin or PCNA,. Biochemical findings showed that AMH and estrogenlevels were increased significantly with asprosin administration compared to POIgroup; histological and immunohistochemical findings showed that asprosin caused asignificant increase in the number of developing follicles as well as primordial folliclesand the proliferation of granulosa cells.In conclusion, our study showed that asprosin positively affects ovarian reserveand follicle development by causing activation of primordial follicles. In this context,we think that our study will lead to new studies in which asprosin will be investigated on various factors and mechanisms affecting the activation of primordial follicles and follicle development.
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Keywords
Asprosin, Adipokin, POI, İnfertilite, Ovaryan folikül gelişimi, Adipokine, Infertility, Ovarian follicle development