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A threshold concentration of FSH is needed during IVM of ex vivo collected human oocytes. | LitMetric

A threshold concentration of FSH is needed during IVM of ex vivo collected human oocytes.

J Assist Reprod Genet

Laboratory of Reproductive Biology, The Juliane Marie Centre for Women, Children and Reproduction, University Hospital of Copenhagen, Rigshospitalet, Copenhagen, Denmark.

Published: June 2021

AI Article Synopsis

  • The study aimed to determine how different concentrations of FSH (Follicle Stimulating Hormone) affect in vitro maturation of human oocytes and the associated gene expression changes in surrounding cumulus cells.
  • Researchers utilized immature oocytes from 32 patients who had undergone surgery for ovarian tissue freezing, testing various FSH concentrations ranging from 0 to 250 IU/L during a 44-hour maturation process.
  • Results showed that higher FSH concentrations (70 and 250 IU/L) significantly improved nuclear maturation of the oocytes by altering gene expression in cumulus cells, indicating a specific threshold for FSH's effectiveness in oocyte maturation.

Article Abstract

Purpose: To investigate the effect of different FSH concentrations on human oocyte maturation in vitro and its impact on gene expression of key factors in the surrounding cumulus cells.

Methods: The study included 32 patients who underwent unilateral oophorectomy for ovarian tissue cryopreservation (OTC) (aged 28 years on average). Immature oocytes were collected from surplus medulla tissue. A total of 587 immature oocytes were divided into three categories according to the size of the cumulus mass: large (L-COCs), small (S-COCs), and naked oocytes (NOs), and submitted to 44-h IVM with one of the following concentrations of recombinant FSH: 0 IU/L, 20 IU/L, 40 IU/L, 70 IU/L, or 250 IU/L. After IVM, oocyte nuclear maturation stage and diameter were recorded. The relative gene expression of FSHR, LHCGR, and CYP19A1 in cumulus cells before (day 0; D0) and after IVM were evaluated.

Results: Addition of 70 or 250 IU/L FSH to the IVM medium improved oocyte nuclear maturation compared to 0, 20, and 40 IU/L FSH by upregulating LHCGR and downregulating FSHR in the cumulus cells.

Conclusion: FSH improved oocyte nuclear maturation at concentrations above 70 IU/L suggesting a threshold for FSH during IVM of ex vivo collected human oocytes from small antral follicles. Moreover, current results for the first time highlight that FSH function in vitro is mediated via cumulus cells by downregulating FSHR and upregulating LHCGR, which was also observed when the immature oocytes progressed in meiosis from the GV to the MII stage.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8266958PMC
http://dx.doi.org/10.1007/s10815-021-02244-8DOI Listing

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