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实验性诱导的子宫内膜炎会损害牛卵母细胞的发育能力。

Experimentally Induced Endometritis Impairs the Developmental Capacity of Bovine Oocytes†.

机构信息

Department of Large Animal Clinical Sciences, University of Florida, Gainesville FL, USA.

Animal Reproduction and Biotechnology Laboratory, Department of Biomedical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, USA.

出版信息

Biol Reprod. 2020 Aug 21;103(3):508-520. doi: 10.1093/biolre/ioaa069.

Abstract

Uterine infection is associated with infertility in women and dairy cows, even after the resolution of infection. However, the mechanisms causing this persistent infertility are unclear. Here, we hypothesized that induced endometritis in non-lactating dairy cows would reduce the developmental competence of oocytes. Non-lactating Holstein cows received an intrauterine infusion of endometrial pathogenic bacteria (Escherichia coli and Trueperella pyogenes; n = 12) or vehicle control (n = 11) on day 2 of the estrous cycle. Bacterial infusion increased expression of endometrial inflammatory mediators, and a mucopurulent discharge in the vagina confirmed the establishment of endometritis. Oocytes were collected by transvaginal ultrasound-guided ovum pickup on days 2, 24, 45, and 66 following infusion and subjected to in vitro fertilization and embryo culture. Bacterial infusion resulted in fewer cleaved oocytes developing to morulae compared to vehicle-infused controls (30.7 versus 45.0%), with the greatest effect observed in oocytes collected on day 24. Development to morula was inversely correlated with endometrial expression of IL6 on day 6. The expression of genes associated with embryo quality did not differ significantly between morulae from bacteria-infused and control cows. Artificial insemination 130 days after intrauterine infusion resulted in normal, filamentous embryos that produced interferon tau 16 days after conception in both infusion groups. This model of experimentally induced uterine infection successfully resulted in endometritis and a reduction in the proportion of oocytes that developed to morulae following in vitro fertilization. In conclusion, endometritis reduced the capacity of oocytes to develop to morulae.

摘要

子宫感染与女性和奶牛的不孕有关,即使感染得到解决也是如此。然而,导致这种持续性不孕的机制尚不清楚。在这里,我们假设非泌乳奶牛的诱导性子宫内膜炎会降低卵母细胞的发育能力。非泌乳荷斯坦奶牛在发情周期的第 2 天接受宫内输注子宫内膜致病菌(大肠杆菌和真细菌;n=12)或载体对照(n=11)。细菌输注增加了子宫内膜炎症介质的表达,阴道中出现粘液脓性分泌物证实了子宫内膜炎的建立。在输注后第 2、24、45 和 66 天,通过经阴道超声引导的卵母细胞采集技术采集卵母细胞,并进行体外受精和胚胎培养。与载体输注对照相比,细菌输注导致较少的卵裂卵发育成桑葚胚(30.7%对 45.0%),在第 24 天采集的卵母细胞中观察到最大的影响。桑葚胚的发育与第 6 天子宫内膜 IL6 的表达呈负相关。来自细菌输注和对照牛的桑葚胚中与胚胎质量相关的基因表达没有显著差异。宫内输注 130 天后进行人工授精,两组均产生正常的丝状胚胎,在受孕后 16 天产生干扰素 tau。这种实验性诱导的子宫感染模型成功地导致了子宫内膜炎,并降低了体外受精后卵母细胞发育成桑葚胚的比例。总之,子宫内膜炎降低了卵母细胞发育成桑葚胚的能力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5a84/7442778/3095a454b401/ioaa069ga1.jpg

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