Background: Cumulus cells, as oocyte nurse cells, provide a suitable microenvironment with growth factors and cellular interactions required for oocyte maturation. Thus, these cells may serve as a natural niche for studies of female germ cell development. Cumulus cells may help attain a better understanding of the causes of infertility in women and eventually improve the outcomes of cases that respond poorly to standard infertility treatment.
Objective: The aim of this study was to isolate, culture, and investigate the biological characteristics of human cumulus cells.
Materials And Methods: In this experimental study, cumulus cells were isolated, cultured, and characterized using reverse transcription-polymerase chain reaction analyses of specific genes including , , , , and The presence of vimentin, a structural protein, was examined via immunofluorescent staining. Moreover, levels of anti-mullerian hormone (AMH) and progesterone secretion by cumulus cells were measured with ELISA after 2, 4, 12, 24, and 48 hr of culture.
Results: In adherent culture, human cumulus cells expressed specific genes and markers as well as secreted AMH and progesterone into the medium.
Conclusion: Cumulus cells secrete AMH and progesterone in an adherent culture and might be applicable for maturation (IVM) and gametogenesis (IVG) studies.
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http://dx.doi.org/10.18502/ijrm.v18i1.6189 | DOI Listing |
PLoS One
January 2025
School of Life Science, Inner Mongolia University, Hohhot, PR China.
Ovarian tissue cryopreservation addresses critical challenges in fertility preservation for prepubertal female cancer patients, such as the lack of viable eggs and hormonal deficiencies. However, mitigating follicle and granulosa cell damage during freeze-thaw cycles remains an urgent issue. Luteinizing hormone (LH), upon binding to luteinizing hormone receptors (LHR) on granulosa cells, enhances estrogen synthesis and secretion, contributing to the growth of granulosa cells and follicles.
View Article and Find Full Text PDFInt J Mol Sci
December 2024
Department of Biosciences, Biotechnology and Environment, University of Bari Aldo Moro, 70125 Bari, Italy.
Di-(2-ethylhexyl) phthalate (DEHP) and Cadmium (Cd) affect female reproduction. To date, toxicological research has focused on the effects of individual contaminants, whereas living beings are exposed to mixtures. This study analyzed the effects of a DEHP/Cd mixture on nuclear and cytoplasmic maturation of sheep cumulus-oocyte complexes (COCs) compared with single compounds.
View Article and Find Full Text PDFLife Sci
January 2025
Division of Applied Life Science (BK21 Four), Gyeongsang National University, Jinju 52828, Gyeongnam Province, Republic of Korea; Institute of Agriculture and Life Science, Gyeongsang National University, Gyeongnam Province, Republic of Korea; Division of Animal Science, Gyeongsang National University, Jinju 52828, Republic of Korea; The King Kong Corp. Ltd., Gyeongsang National University, Jinju 52828, Gyeongnam Province, Republic of Korea. Electronic address:
Telomerase is highly expressed in oocyte cumulus cells and plays a significant role in follicular development and oocyte maturation. In this study, we hypothesized that in vitro culture conditions may affect telomerase activity during in vitro embryo production (IVP) and that its activation may improve embryo quality. We first examined telomerase protein levels and localization in bovine cumulus-oocyte complexes via immunofluorescence assays.
View Article and Find Full Text PDFF S Sci
January 2025
Division of Human Reproduction, Department of Obstetrics and Gynecology, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil. Electronic address:
This study investigated whether luteinizing hormone receptor (LHR) expression varies in the granulosa cells of individual follicles according to the maturation stage of the oocytes harvested for assisted reproductive technology (ART) treatment. We observed minimal to no LHR mRNA and protein expression in cumulus cells surrounding oocytes arrested in the germinal vesicle (GV) stage. Interestingly, their ability to mature was confirmed by rescue in vitro maturation, suggesting somatic cell LHR deficiency as a key factor for the retrieval of GV oocytes in ART procedures.
View Article and Find Full Text PDFCell Commun Signal
January 2025
Laboratory of Theriogenology, College of Veterinary Medicine, Chungnam National University, Daejeon, 34134, Republic of Korea.
Background: Although the Notch signaling pathway is known to play an important role in ovarian follicle development in mammals, whether it is involved in oocyte maturation remains unclear. Therefore, this study was performed to elucidate the existence and role of the Notch signaling pathway during oocyte maturation in a porcine model.
Methods: Reverse transcription-polymerase chain reaction (RT-PCR) and immunocytochemical assays were used to determine the existence of Notch signaling pathway-related transcripts and proteins in porcine cumulus-oocyte complexes (COCs).
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