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Reproduction, fertility, and development2015; 27(6); 944-956; doi: 10.1071/RD14468

Cytoskeletal alterations associated with donor age and culture interval for equine oocytes and potential zygotes that failed to cleave after intracytoplasmic sperm injection.

Abstract: Intracytoplasmic sperm injection (ICSI) is an established method to fertilise equine oocytes, but not all oocytes cleave after ICSI. The aims of the present study were to examine cytoskeleton patterns in oocytes after aging in vitro for 0, 24 or 48h (Experiment 1) and in potential zygotes that failed to cleave after ICSI of oocytes from donors of different ages (Experiment 2). Cytoplasmic multiasters were observed after oocyte aging for 48h (P<0.01). A similar increase in multiasters was observed with an increased interval after ICSI for young mares (9-13 years) but not old (20-25 years) mares. Actin vesicles were observed more frequently in sperm-injected oocytes from old than young mares. In the present study, multiasters appeared to be associated with cell aging, whereas actin vesicles were associated with aging of the oocyte donor.
Publication Date: 2015-03-24 PubMed ID: 25798646PubMed Central: PMC4934900DOI: 10.1071/RD14468Google Scholar: Lookup
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  • Journal Article

Summary

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The research article discusses a study regarding the effects of aging and time in culture on the cytoskeleton structure of equine oocytes failed to be fertilised through the intracytoplasmic sperm injection (ICSI) method. The authors also explored the differences in these structures between oocytes derived from younger and older horses.

Objective of the Study

  • The study aimed to understand how aging and in vitro culture time affects the cytoskeletal structures in horse oocytes subject to intracytoplasmic sperm injection (ICSI). It also aimed to examine the differences between the cytoskeleton in oocytes derived from younger and older horses that did not cleave after ICSI.

Methodology and Experiments

  • The research was conducted in two main experiments. In Experiment 1, the researchers examined cytoskeleton patterns in oocytes after they were aged in vitro for 0, 24, or 48 hours.
  • In Experiment 2, the team focused on potential zygotes that did not cleave after undergoing ICSI. The donor oocytes for this procedure came from females of different age groups.

Findings

  • The research found cytoplasmic multiasters (star-shaped figures formed in the cell cytoplasm) were noticed in the oocytes aged for 48 hours in vitro.
  • The number of multiasters also increased with the interval after ICSI for younger mares (9-13 years), but this was not observed in mares who were older (20-25 years).
  • Actin vesicles, small enclosed pouches that contain actin proteins that help in cell movement and structure, were observed more frequently in sperm-injected oocytes from older mares when compared to the younger ones.

Conclusion

  • The study concluded that cytoplasmic multiasters appeared to be associated with cell aging, whereas actin vesicles were associated with the age of the oocyte donor. Hence, the age factor manifests at two different cellular levels – the cell aging (indicated by multiasters) and the donor’s age (indicated by actin vesicles).

Cite This Article

APA
Ruggeri E, DeLuca KF, Galli C, Lazzari G, DeLuca JG, Carnevale EM. (2015). Cytoskeletal alterations associated with donor age and culture interval for equine oocytes and potential zygotes that failed to cleave after intracytoplasmic sperm injection. Reprod Fertil Dev, 27(6), 944-956. https://doi.org/10.1071/RD14468

Publication

ISSN: 1448-5990
NlmUniqueID: 8907465
Country: Australia
Language: English
Volume: 27
Issue: 6
Pages: 944-956

Researcher Affiliations

Ruggeri, Elena
  • Department of Biomedical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, 1601 Campus Delivery, Fort Collins, CO 80523, USA.
DeLuca, Keith F
  • Department of Biochemistry and Molecular Biology, College of Natural Sciences, Colorado State University, 1870 Campus Delivery, Fort Collins, CO 80523, USA.
Galli, Cesare
  • Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di sopra, 50, 40064, Ozzano Emilia (Bologna), Italy.
Lazzari, Giovanna
  • Avantea srl, Laboratory of Reproductive Technologies, Via Porcellasco 7f, 26100 Cremona, Italy.
DeLuca, Jennifer G
  • Department of Biochemistry and Molecular Biology, College of Natural Sciences, Colorado State University, 1870 Campus Delivery, Fort Collins, CO 80523, USA.
Carnevale, Elaine M
  • Department of Biomedical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, 1601 Campus Delivery, Fort Collins, CO 80523, USA.

MeSH Terms

  • Age Factors
  • Animals
  • Cytoskeleton / metabolism
  • Female
  • Fertilization in Vitro / veterinary
  • Horses
  • Male
  • Oocytes / metabolism
  • Sperm Injections, Intracytoplasmic / methods
  • Sperm Injections, Intracytoplasmic / veterinary
  • Spermatozoa / metabolism
  • Zygote / metabolism

Grant Funding

  • R01 GM088371 / NIGMS NIH HHS

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