Avicenna J Med Biotech

arij002

Avicenna Journal of Medical Biotechnology

2008-2835 2008-4625

Avicenna Research Institute

ajmb60593

The Effect of Simulated Physiological Oocyte Maturation (SPOM) and L-Carnitine on Bovine Oocyte Developmental Competence

Malekpour

Ali

Shirazi

Abolfazl

Reproductive Biotechnology Research Center, Avicenna Research Institute, ACECR , Tehran, Iran

Borjian Boroujeni

Sara

Department of Clinical Science, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran

Sarvari

Ali

Naderi

Mohammad Mehdi

Department of Biotechnology, School of Life Sciences, Karpagam University, Coimbatore, Tamil Nadu, India

Pournourali

Mostafa

Behzadi

Bahareh

Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranDepartment of Developmental Biology, University of Science and Culture, ACECR, Tehran, Iran

Mehrazar

Mohammad Mehdi

16 4 260 267 17 4 2024 31 7 2024

Background: Simulated Physiological Oocyte Maturation (SPOM) mimics in vitro the physiological events of oocyte maturation in the presence of cAMP modulators. These modulators increase the intracellular concentrations of cAMP, which inhibits the immediate resumption of meiosis and gives the oocyte more time to gain optimal developmental competence. In addition, L-carnitine helps to increase the energy supply of cells through the β-oxidation of fatty acids. This study aimed to investigate the effect of SPOM and L-carnitine supplementation during In Vitro Maturation (IVM) and In Vitro Culture (IVC) on the developmental competence of bovine oocytes. Methods: Ovarian Cumulus Complexes (COCs) were cultured in the presence or absence of forskolin+IBMX during the first 2 hr of IVM (pre-IVM) with or without L-carnitine (LC) during IVM or IVC in six experimental groups as follows: I) pre-IVM (pre-IVM group), II) pre-IVM with L-carnitine supplementation during IVM (pre-IVM/LC group), III) L-carnitine supplementation during IVM (IVM/LC group), IV) L-carnitine supplementation during in vitro culture (IVC/LC group), V) pre-IVM+ IVC/LC group, and VI) no treatment during IVM and IVC (Control group). The cleavage and blastocyst rates, the blastocysts’ total cells number, and the expression of Nanog, Bax, Oct4, Cdx2, and Ifnt genes in resulting blastocysts were assessed. To assess differences among experimental groups, a one-way analysis of variance was initially employed, followed by post hoc Fisher LSD. The difference between groups was considered statistically significant when p<0.05. Results: The cleavage and blastocyst rates in the Pre-IVM and Pre-IVM/LC groups was higher than control group and other groups (p≤0.05) except for IVC/LC and IVM/LC groups, respectively. The number of blastocyst’s Inner Cell Mass (ICM) in pre-IVM and Pre-IVM/LC groups as well as the ratio of ICM/TE were higher than control group (p<0.05). The expression of OCT4, CDX2, and IFNT increased in both the pre-IVM and pre-IVM/LC groups compared to the control group (p<0.05). Conclusion: In conclusion, the application of SPOM-adapted IVM and L-carnitine during IVM of bovine oocyte improves the quantity and quality of the resulting embryos.