Research
Print page Print page
Switch language
The Capital Region of Denmark - a part of Copenhagen University Hospital
Published

Hallmarks of Human Small Antral Follicle Development: Implications for Regulation of Ovarian Steroidogenesis and Selection of the Dominant Follicle

Research output: Contribution to journalJournal articleResearchpeer-review

DOI

  1. Editorial: Novel Biomarkers for Type 2 Diabetes

    Research output: Contribution to journalEditorialResearchpeer-review

  2. Editorial: The Role of Genetic and Lifestyle Factors in Metabolic Diseases

    Research output: Contribution to journalEditorialResearchpeer-review

  3. Liraglutide-Induced Weight Loss May be Affected by Autonomic Regulation in Type 1 Diabetes

    Research output: Contribution to journalJournal articleResearchpeer-review

  4. In-utero Exposure to Maternal Stressful Life Events and Risk of Cryptorchidism: The Raine Study

    Research output: Contribution to journalJournal articleResearchpeer-review

  1. Gene Expression in Granulosa Cells From Small Antral Follicles From Women With or Without Polycystic Ovaries

    Research output: Contribution to journalJournal articleResearchpeer-review

  2. Quantitative Differences in TGF-β Family Members Measured in Small Antral Follicle Fluids From Women With or Without PCO

    Research output: Contribution to journalJournal articleResearchpeer-review

View graph of relations

Regulation of human ovarian steroidogenesis differs from other species and precise knowledge on how human small antral follicles (hSAF) develop and acquire competence for continued growth and steroid output is still incomplete. The present study has characterized almost 1,000 normal hSAF collected in connection with cryopreservation of ovarian tissue for fertility preservation. The antral follicles (ranging from 3 to 13 mm) were generally aspirated from one ovary surgically removed during the natural cycle, and the follicular fluid (FF) and the granulosa cells (GC) were isolated and snap-frozen. In FF, the following hormones were measured: inhibin-B, inhibin-A, AMH, follistatin, PAPP-A, estradiol, progesterone, testosterone, and androstenedione. In GC, mRNA gene expressions using q-PCR were measured for the following genes: FSHR, AMH, CYP19, and AR. All samples in which one of the abovementioned parameters was measured were included, but typically multiple parameters were measured. Highly significant differences in concentration and follicular content in relation to follicular diameter were found for all measured hormones despite massive variability in-between follicles for any given diameter. The results demonstrate that profound changes take place in the hormonal microenvironment around follicular diameters of 8-11 mm corresponding to when follicular selection occurs. At this point, inhibin-B and inhibin-A showed distinct peaks concomitant with a significant reduction in both AMH protein and mRNA expression. Concentrations of inhibins, androgens, FSHR, and AR were intimately associated, and it is suggested that inhibin-B in combination with PAPP-A and thereby IGF2 activity exerts important paracrine signaling at follicular selection. At the same time upregulation of estradiol synthesis and CYP19 mRNA expression increased steroid output profoundly. Furthermore, the highly significant association between FSHR and AR mRNA gene expression enforces important functions of androgens in follicular development. Collectively, these data reintroduce the understanding of the follicular phase as two parted in which regulation of steroidogenesis differs. The profound changes taking place around follicular selection highlight important paracrine actions of TGF-β family members and IGFs for securing dominance of the selected follicle.

Original languageEnglish
JournalFrontiers in Endocrinology
Volume8
Pages (from-to)376
ISSN1664-2392
DOIs
Publication statusPublished - 2018

    Research areas

  • Journal Article

ID: 52661114