目的:表征人卵巢中的生长因子中期因子(MDK),以i)确定是否在卵巢内局部产生MDK;ii)检查不同的卵巢细胞类型是否更有可能产生MDK;iii)以及在卵泡生长过程中是否存在任何阶段特异性变化。先前的研究表明,MDK可能会影响人类卵泡生长和卵母细胞成熟。卵泡液(FF)中的蛋白质组学分析已确定MDK在功能上聚集在一起,并遵循与卵巢卵泡发育相关的众所周知的蛋白质相似的表达谱。MDK尚未在人卵巢中表征。
方法:描述性研究单位:大学医院。
方法:该研究包括来自121名患者的样本:71名接受卵巢组织冷冻保存(OTC)的患者(年龄17-37岁)提供了颗粒细胞(GC),卵丘细胞(CC),卵巢皮质,髓质组织,和FF来自小腔卵泡(SAF);50例(年龄20-35岁)接受体外受精(IVF)治疗的患者在诱导最终卵泡成熟之前和之后从排卵前卵泡提供FF。
方法:无GC,和髓质组织.此外,免疫染色和免疫印迹法检测含腔前卵泡的卵巢皮质中的MDK蛋白,SAF,和髓质组织.此外,在诱导卵泡最终成熟之前和之后36小时,进行了ELISA分析以测量从SAF和排卵前卵泡中抽出的FF中MDK的浓度。
结果:免疫染色和RT-qPCR显示,与其他卵巢细胞类型相比,MDK在GC中的表达更为突出。SAF中卵泡内MDK浓度明显高于排卵前卵泡。此外,通过蛋白质印迹在各种卵巢样品类型中检测到不同分子量(Mw)的MDK:GC和FF样品主要呈现一条约15kDa的带和另一条约13kDa的带,而在髓质组织中检测到其他具有较高Mw(30至38kDa)的条带。
结论:这是MDK首次在蛋白质水平上在人卵巢细胞中进行免疫定位,在人类FF中检测到潜在的不同MDK变异,GC,和卵巢髓质组织.需要进一步的研究来测序和鉴定发现的不同潜在的MDK变体,以确定它们对卵巢和卵母细胞能力的功能重要性。
To characterize the growth factor midkine (MDK) in the human ovary to determine whether MDK is produced locally within the ovary, examine whether different ovarian cell types are more likely to produce MDK, and determine whether there are any stage-specific variations during follicle growth. Previous studies have revealed that MDK potentially affects human follicle growth and oocyte maturation. Proteomic analyses in follicular fluid (FF) have identified MDK to functionally cluster together and follow a similar expression profile to that of well-known proteins involved in ovarian follicle development. Midkine has not yet been characterized in the human ovary.
Descriptive study.
University Hospital.
The study included samples from 121 patients: 71 patients (aged 17-37 years) who underwent ovarian tissue cryopreservation provided granulosa cells (GC), cumulus cells, ovarian cortex, medulla tissue, and FF from small antral follicles (SAF); and 50 patients (aged 20-35 years) receiving in vitro fertilization treatment provided FF from preovulatory follicles before and after induction of final follicle maturation.
None.
MDK relative gene expression was quantified using a real-time quantitative polymerase chain reaction in cumulus cells, GC, and medulla tissue. Additionally, immunostaining and western blotting assays were used to detect MDK protein in the ovarian cortex, which contains preantral follicles, SAF, and medulla tissue. Furthermore, enzyme-linked immunosorbent assay analyses were performed to measure the concentration of MDK in FF aspirated from SAF and preovulatory follicles both before and 36 hours after inducing the final maturation of follicles.
Immunostaining and reverse transcription-quantitative polymerase chain reaction revealed a more prominent expression of MDK in GC compared with other ovarian cell types. Intrafollicular MDK concentration was significantly higher in SAF compared with preovulatory follicles. In addition, different molecular weight species of MDK were detected using western blotting in various ovarian sample types: GC and FF samples presented primarily one band of approximately 15 kDa and an additional band of approximately 13 kDa, although other bands with higher molecular weight (between 30 and 38 kDa) were detected in medulla tissue.
This is the first time that MDK has been immunolocalized in human ovarian cells at the protein level and that potentially different MDK variants have been detected in human FF, GC, and ovarian medulla tissue. Future studies are needed to sequence and identify the different potential MDK variants found to determine their functional importance for ovary and oocyte competence.