Expression Profile of Prostaglandin Enzymes in Cystic Endometrial Hyperplasia in Dogs: the Results of a Hypothesis in Clinical Trial

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Abstract

The expressions of prostaglandin synthesis enzymes and estrogen, progesterone receptors in canine cystic endometrial hyperplasia (CEH) were reported in this manuscript. Uterine tissue samples were collected from bitches with CEH (n=5), CEH-P (Cystic endometrial hyperplasia-Pyometra) (n=5) and healthy-negative control group, CG (n=5). Immunohistochemistry was carried out for the estrogen (ER) and progesterone receptor (PR) detection. Shock-frozen samples were utilized in mRNA extraction and Real-Time PCR was performed. Gene expression of PTGS2/COX2, PTGES, PTGER4, PGFS, PTGFR and PGR were detected higher in the CEH group compared with CG. The PGFS and PTGFR (FP) mRNA expressions were significantly increased in CEH compared with other groups. Expression of progesterone receptor mRNA (PGR) was highest in CEH and statistically different from the CEH-P group (P<0.05). No PR immunostaining was observed. ER staining had been detected in endometrial glands, endometrial stoma and myometrium, however hyperplasic glands in propria mucosa had lower or no ER scores. Based on the results of this study, the high levels of prostaglandin enzymes and low ER scores in CEH could be a preliminary step for the next stages of severe differentiation of endometrium.
Bu çalışmada köpek kistik endometriyal hiperplazi (KEH)’de prostaglandin sentez enzimleri, östrojen ve progesterone reseptörlerinin ekspresyonları rapor edilmiştir. Uterus örnekleri KEH (n=5) ve KEH-P (Kistik endomteriyal hiperplazi- pyometra) (n=5)’lı köpeklerden ve sağlıklı negatif kontrol köpeklerinden CG (n=5) toplanmıştır. Östrojen (ER) ve progesterone (PR) reseptörü belirlenmesi için immunohistokimya kullanılmıştır. Şok dondurulan doku örnekleri mRNA ekstraksiyonunda kullanılmış ve bu örneklerden Real Time PCR yapılmıştır. PTGS2/COX2, PTGES, PTGER4, PGFS, PTGFR ve PGR gen ekspresyonu KEH’de, kontrol grubuna göre yüksek bulunmuştur. PGFS ve PTGFR (FP) mRNA ekspresyonları KEH grubunda diğer gruplara göre istatistiksel olarak farklı bulunmuştur. Progesterone reseptor mRNA (PGR) ekspresyonu KEH’de en yüksek ve KEH-P grubuna göre farklı bulunmuştur (P<0.05). PR immun boyamada belirlenememiştir. ER boyanmaları ise endometriyal bezler, endometriyal stroma ve miyometriyumda gözlenirken, proprio mukozadaki hiperplastik bezlerde ya çok az boyanmış ya da hiç boyanma gözlenmemiştir. Bu çalışmanın sonuçlarına dayanarak, CEH’deki yüksek prostaglandin enzim seviyeleri ve düşük ER skorları, endometriumun şiddetli farklılaşmasının sonraki aşamaları için öncü bir adım olabilir.

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This work was supported by the Bursa Uludağ University Scientific Research Projects Unit (project number: DDP(V)-2020/8).

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Canine, Cystic endometrial hyperplasi, Estrogen receptor, Prostaglandin

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