Ahmad Waqas, Suleman Muhammad, Akhtar Jawad, Riaz Amjad, Javed Khalid, Rashid Muhammad Imran, Khan Muhammad Irfan-Ur-Rehman
Department of Theriogenology, University of Veterinary and Animal Sciences, Lahore, Pakistan.
Department of Pathology, University of Veterinary and Animal Sciences, Lahore, Pakistan.
Theriogenology. 2025 Oct 15;246:117552. doi: 10.1016/j.theriogenology.2025.117552. Epub 2025 Jun 20.
This study investigates the mechanistic basis of follicular co-dominance in goats by evaluating the differential expression of gonadotropin receptors and associated functional markers across follicle sizes. Granulosa (GC) and theca cells (TC) were isolated from small (<5.0 mm), medium (5.1-7.0 mm), and large (>7.0 mm) follicles obtained from abattoir-sourced ovaries of sub-tropical Beetal goats. Transcripts of luteinizing hormone receptor (LHR), follicle-stimulating hormone receptor (FSHR), steroidogenic enzymes (CYP19A1, CYP17A1), growth (IGF-1), apoptotic (BAX), and anti-apoptotic (Bcl-2) markers were quantified using RT-qPCR. Receptor density and percentage of LHR- and FSHR-positive GC were analyzed via flow cytometry. Intrafollicular estradiol-17β and progesterone concentrations were measured by radioimmunoassay. LHR expression was significantly elevated in GC of medium follicles and in TC of small and medium follicles. FSHR transcripts were significantly abundant in GC of small follicles. Flow cytometry revealed that medium follicles exhibited the highest percentage and mean fluorescence intensity (MFI) for both FSHR and LHR, suggesting dual gonadotropin sensitivity. Estradiol-17β and progesterone concentrations were also significantly higher in medium compared to small follicles, consistent with enhanced steroidogenic activity. CYP19A1 expression peaked in GC of small follicles, while CYP17A1 was elevated in TC of small and medium follicles. Bcl-2 expression was higher in medium follicles than in large follicles, while IGF-1 and BAX expression remained unchanged across sizes. These findings provide novel insight into goat follicular physiology, supporting the hypothesis that medium follicles co-express both gonadotropin receptors, potentially enabling co-dominance through dual hormonal responsiveness.
本研究通过评估不同大小卵泡中促性腺激素受体及相关功能标志物的差异表达,探讨山羊卵泡共同优势的机制基础。从亚热带比塔尔山羊屠宰场获取的卵巢中分离出小卵泡(<5.0毫米)、中卵泡(5.1 - 7.0毫米)和大卵泡(>7.0毫米)的颗粒细胞(GC)和卵泡膜细胞(TC)。使用RT-qPCR对促黄体生成素受体(LHR)、促卵泡激素受体(FSHR)、类固醇生成酶(CYP19A1、CYP17A1)、生长(IGF-1)、凋亡(BAX)和抗凋亡(Bcl-2)标志物的转录本进行定量分析。通过流式细胞术分析LHR和FSHR阳性GC的受体密度和百分比。采用放射免疫分析法测定卵泡内雌二醇-17β和孕酮浓度。LHR表达在中卵泡的GC以及小卵泡和中卵泡的TC中显著升高。FSHR转录本在小卵泡的GC中显著丰富。流式细胞术显示,中卵泡的FSHR和LHR的百分比和平均荧光强度(MFI)最高,表明对促性腺激素具有双重敏感性。与小卵泡相比,中卵泡的雌二醇-17β和孕酮浓度也显著更高,这与增强的类固醇生成活性一致。CYP19A1表达在小卵泡的GC中达到峰值,而CYP17A1在小卵泡和中卵泡的TC中升高。Bcl-2表达在中卵泡中高于大卵泡,而IGF-1和BAX表达在不同大小卵泡中保持不变。这些发现为山羊卵泡生理学提供了新的见解,支持了中卵泡同时表达两种促性腺激素受体,可能通过双重激素反应实现共同优势的假说。