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Ducreux B, Patrat C, Trasler J, Fauque P. Transcriptomic integrity of human oocytes used in ARTs: technical and intrinsic factor effects. Hum Reprod Update 2024; 30:26-47. [PMID: 37697674 DOI: 10.1093/humupd/dmad025] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/04/2023] [Indexed: 09/13/2023] Open
Abstract
BACKGROUND Millions of children have been born throughout the world thanks to ARTs, the harmlessness of which has not yet been fully demonstrated. For years, efforts to evaluate the specific effects of ART have focused on the embryo; however, it is the oocyte quality that mainly dictates first and foremost the developmental potential of the future embryo. Ovarian stimulation, cryopreservation, and IVM are sometimes necessary steps to obtain a mature oocyte, but they could alter the appropriate expression of the oocyte genome. Additionally, it is likely that female infertility, environmental factors, and lifestyle have a significant influence on oocyte transcriptomic quality, which may interfere with the outcome of an ART attempt. OBJECTIVE AND RATIONALE The objective of this review is to identify transcriptomic changes in the human oocyte caused by interventions specific to ART but also intrinsic factors such as age, reproductive health issues, and lifestyle. We also provide recommendations for future good practices to be conducted when attempting ART. SEARCH METHODS An in-depth literature search was performed on PubMed to identify studies assessing the human oocyte transcriptome following ART interventions, or in the context of maternal aging, suboptimal lifestyle, or reproductive health issues. OUTCOMES ART success is susceptible to external factors, maternal aging, lifestyle factors (smoking, BMI), and infertility due to endometriosis or polycystic ovary syndrome. Indeed, all of these are likely to increase oxidative stress and alter mitochondrial processes in the foreground. Concerning ART techniques themselves, there is evidence that different ovarian stimulation regimens shape the oocyte transcriptome. The perturbation of processes related to the mitochondrion, oxidative phosphorylation, and metabolism is observed with IVM. Cryopreservation might dysregulate genes belonging to transcriptional regulation, ubiquitination, cell cycle, and oocyte growth pathways. For other ART laboratory factors such as temperature, oxygen tension, air pollution, and light, the evidence remains scarce. Focusing on genes involved in chromatin-based processes such as DNA methylation, heterochromatin modulation, histone modification, and chromatin remodeling complexes, but also genomic imprinting, we observed systematic dysregulation of such genes either after ART intervention or lifestyle exposure, as well as due to internal factors such as maternal aging and reproductive diseases. Alteration in the expression of such epigenetic regulators may be a common mechanism linked to adverse oocyte environments, explaining global transcriptomic modifications. WIDER IMPLICATIONS Many IVF factors and additional external factors have the potential to impair oocyte transcriptomic integrity, which might not be innocuous for the developing embryo. Fortunately, it is likely that such dysregulations can be minimized by adapting ART protocols or reducing adverse exposure.
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Affiliation(s)
- Bastien Ducreux
- Université Bourgogne Franche-Comtés-Equipe Génétique des Anomalies du Développement (GAD) INSERM UMR1231, Dijon, France
| | - Catherine Patrat
- Université de Paris Cité, Faculty of Medicine, Inserm 1016, Paris, France
- Department of Reproductive Biology-CECOS, aphp.centre-Université Paris Cité, Paris, France
| | - Jacquetta Trasler
- Department of Pediatrics, McGill University and Research Institute of the McGill University Health Centre, Montreal, QC, Canada
- Department of Human Genetics, McGill University and Research Institute of the McGill University Health Centre, Montreal, QC, Canada
- Department of Pharmacology & Therapeutics, McGill University and Research Institute of the McGill University Health Centre, Montreal, QC, Canada
| | - Patricia Fauque
- Université Bourgogne Franche-Comtés-Equipe Génétique des Anomalies du Développement (GAD) INSERM UMR1231, Dijon, France
- CHU Dijon Bourgogne, Laboratoire de Biologie de la Reproduction-CECOS, Dijon, France
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Zeng W, Xiao D, Chen R, Lu Y, Liang W, Sun H. A novel method for gas mixing and distribution in multi-chamber embryo incubators. Technol Health Care 2024; 32:169-181. [PMID: 38759047 PMCID: PMC11191516 DOI: 10.3233/thc-248015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/19/2024]
Abstract
BACKGROUND High-quality control of the gas environment in incubators is crucial for in vitro embryo development, which requires high accuracy, fast recovery, and low gas consumption. OBJECTIVE In this study, we propose a novel gas mixing and distribution system and method as an alternative solution for multi-chamber embryo incubators. METHODS The system-based embryo incubator enables a controllable gas circulation process and a quantitative supply of CO2 and N2. To determine the optimal parameters for the mixing time and flow rate of the circulated gases, we conducted contrast experiments on the system-based incubator. To evaluate the performance of the gas system in the incubator, we conducted tests under four different initial conditions, simulating various practical application scenarios. Furthermore, we performed a mouse embryo assay to assess the system's effectiveness. RESULTS The results show that the system achieved a gas concentration accuracy of ± 0.2% (volume fraction) after stabilization, a minimum recovery time of 5 minutes, an average consumption of 8.9 L/d for N2 and 0.83 L/d for CO2 during routine operation, and a blastocyst rate exceeding 90% observed after 96 hours of culture in the incubator. CONCLUSION The system and method demonstrate a significant advantage in terms of low gas consumption compared to existing incubators, while still maintaining high accuracy and fast recovery.
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Affiliation(s)
- Weijun Zeng
- School of Biomedical Engineering (Suzhou), University of Science and Technology of China, Hefei, Anhui, China
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu, China
| | - Donggen Xiao
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu, China
| | - Ruitao Chen
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu, China
| | - Yao Lu
- School of Biomedical Engineering (Suzhou), University of Science and Technology of China, Hefei, Anhui, China
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu, China
| | - Weiguo Liang
- School of Biomedical Engineering (Suzhou), University of Science and Technology of China, Hefei, Anhui, China
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu, China
| | - Haixuan Sun
- School of Biomedical Engineering (Suzhou), University of Science and Technology of China, Hefei, Anhui, China
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu, China
- Jinan Guokeyigong Science and Technology Development Company Ltd., Jinan, Shandong, China
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Zhang Y, Zhou M, Liang Y, Li R, Zhang L, Chen S, Yang K, Ding H, Tan X, Zhang Q, Qiao Z. Study of Transcriptomic Analysis of Yak ( Bos grunniens) and Cattle ( Bos taurus) Pulmonary Artery Smooth Muscle Cells under Oxygen Concentration Gradients and Differences in Their Lung Histology and Expression of Pyruvate Dehydrogenase Kinase 1-Related Factors. Animals (Basel) 2023; 13:3450. [PMID: 38003068 PMCID: PMC10668684 DOI: 10.3390/ani13223450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/27/2023] [Accepted: 11/04/2023] [Indexed: 11/26/2023] Open
Abstract
The aim of this study was to investigate the molecular mechanisms by which hypoxia affects the biological behavior of yak PASMCs, the changes in the histological structure of yak and cattle lungs, and the relationships and regulatory roles that exist regarding the differences in the distribution and expression of PDK1 and its hypoxia-associated factors screened for their role in the adaptation of yak lungs to the plateau hypoxic environment. The results showed that, at the level of transcriptome sequencing, the molecular regulatory mechanisms of the HIF-1 signaling pathway, glucose metabolism pathway, and related factors (HK2/PGK1/ENO1/ENO3/ALDOC/ALDOA) may be closely related to the adaptation of yaks to the hypoxic environment of the plateau; at the tissue level, the presence of filled alveoli and semi-filled alveoli, thicker alveolar septa and basement membranes, a large number of erythrocytes, capillary distribution, and collagen fibers accounted for all levels of fine bronchioles in the lungs of yaks as compared to cattle. A higher percentage of goblet cells was found in the fine bronchioles of yaks, and PDK1, HIF-1α, and VEGF were predominantly distributed and expressed in the monolayers of ciliated columnar epithelium in the branches of the terminal fine bronchioles of yak and cattle lungs, with a small amount of it distributed in the alveolar septa; at the molecular level, the differences in PDK1 mRNA relative expression in the lungs of adult yaks and cattle were not significant (p > 0.05), the differences in HIF-1α and VEGF mRNA relative expression were significant (p < 0.05), and the expression of PDK1 and HIF-1α proteins in adult yaks was stronger than that in adult cattle. PDK1 and HIF-1α proteins were more strongly expressed in adult yaks than in adult cattle, and the difference was highly significant (p < 0.01); the relative expression of VEGF proteins was not significantly different between adult yaks and cattle (p > 0.05). The possible regulatory relationship between the above results and the adaptation of yak lungs to the plateau hypoxic environment paves the way for the regulatory mechanisms of PDK1, HIF-1α, and VEGF, and provides basic information for studying the mechanism of hypoxic adaptation of yaks in the plateau. At the same time, it provides a reference for human hypoxia adaptation and a target for the prevention and treatment of plateau diseases in humans and plateau animals.
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Affiliation(s)
- Yiyang Zhang
- Engineering Research Center of Key Technology and Industrialization of Cell-Based Vaccine, Ministry of Education, Northwest Minzu University, Lanzhou 730030, China; (Y.Z.); (M.Z.); (R.L.); (S.C.); (Z.Q.)
- Gansu Tech Innovation Center of Animal Cell, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
| | - Manlin Zhou
- Engineering Research Center of Key Technology and Industrialization of Cell-Based Vaccine, Ministry of Education, Northwest Minzu University, Lanzhou 730030, China; (Y.Z.); (M.Z.); (R.L.); (S.C.); (Z.Q.)
- Gansu Tech Innovation Center of Animal Cell, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
| | - Yuxin Liang
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
| | - Rui Li
- Engineering Research Center of Key Technology and Industrialization of Cell-Based Vaccine, Ministry of Education, Northwest Minzu University, Lanzhou 730030, China; (Y.Z.); (M.Z.); (R.L.); (S.C.); (Z.Q.)
- Gansu Tech Innovation Center of Animal Cell, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
| | - Lan Zhang
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
| | - Shuwu Chen
- Engineering Research Center of Key Technology and Industrialization of Cell-Based Vaccine, Ministry of Education, Northwest Minzu University, Lanzhou 730030, China; (Y.Z.); (M.Z.); (R.L.); (S.C.); (Z.Q.)
- Gansu Tech Innovation Center of Animal Cell, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
| | - Kun Yang
- Engineering Research Center of Key Technology and Industrialization of Cell-Based Vaccine, Ministry of Education, Northwest Minzu University, Lanzhou 730030, China; (Y.Z.); (M.Z.); (R.L.); (S.C.); (Z.Q.)
- Gansu Tech Innovation Center of Animal Cell, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
| | - Haie Ding
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
| | - Xiao Tan
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
| | - Qian Zhang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China;
| | - Zilin Qiao
- Engineering Research Center of Key Technology and Industrialization of Cell-Based Vaccine, Ministry of Education, Northwest Minzu University, Lanzhou 730030, China; (Y.Z.); (M.Z.); (R.L.); (S.C.); (Z.Q.)
- Gansu Tech Innovation Center of Animal Cell, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Key Laboratory of Biotechnology and Bioengineering of State Ethnic Affairs Commission, Biomedical Research Center, Northwest Minzu University, Lanzhou 730030, China
- Life Science and Engineering College, Northwest Minzu University, Lanzhou 730030, China; (Y.L.); (L.Z.); (H.D.); (X.T.)
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Mo L, Ma J, Xiong Y, Xiong X, Lan D, Li J, Yin S. Factors Influencing the Maturation and Developmental Competence of Yak ( Bos grunniens) Oocytes In Vitro. Genes (Basel) 2023; 14:1882. [PMID: 37895231 PMCID: PMC10606142 DOI: 10.3390/genes14101882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 09/17/2023] [Accepted: 09/25/2023] [Indexed: 10/29/2023] Open
Abstract
The yak (Bos grunniens) is a unique breed living on the Qinghai-Tibet Plateau and its surrounding areas, providing locals with a variety of vital means of living and production. However, the yak has poor sexual maturity and low fertility. High-quality mature oocytes are the basis of animal breeding technology. Recently, in vitro culturing of oocytes and embryo engineering technology have been applied to yak breeding. However, compared to those observed in vivo, the maturation rate and developmental capacity of in vitro oocytes are still low, which severely limits the application of in vitro fertilization and embryo production in yaks. This review summarizes the endogenous and exogenous factors affecting the in vitro maturation (IVM) and developmental ability of yak oocytes reported in recent years and provides a theoretical basis for obtaining high-quality oocytes for in vitro fertilization and embryo production in yaks.
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Affiliation(s)
- Luoyu Mo
- College of Animal and Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China; (L.M.); (J.M.); (Y.X.); (X.X.); (D.L.); (J.L.)
| | - Jun Ma
- College of Animal and Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China; (L.M.); (J.M.); (Y.X.); (X.X.); (D.L.); (J.L.)
| | - Yan Xiong
- College of Animal and Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China; (L.M.); (J.M.); (Y.X.); (X.X.); (D.L.); (J.L.)
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization Key Laboratory of Sichuan Province, Chengdu 610041, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu 610041, China
| | - Xianrong Xiong
- College of Animal and Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China; (L.M.); (J.M.); (Y.X.); (X.X.); (D.L.); (J.L.)
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization Key Laboratory of Sichuan Province, Chengdu 610041, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu 610041, China
| | - Daoliang Lan
- College of Animal and Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China; (L.M.); (J.M.); (Y.X.); (X.X.); (D.L.); (J.L.)
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization Key Laboratory of Sichuan Province, Chengdu 610041, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu 610041, China
| | - Jian Li
- College of Animal and Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China; (L.M.); (J.M.); (Y.X.); (X.X.); (D.L.); (J.L.)
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization Key Laboratory of Sichuan Province, Chengdu 610041, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu 610041, China
| | - Shi Yin
- College of Animal and Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China; (L.M.); (J.M.); (Y.X.); (X.X.); (D.L.); (J.L.)
- Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization Key Laboratory of Sichuan Province, Chengdu 610041, China
- Key Laboratory of Animal Science of National Ethnic Affairs Commission of China, Southwest Minzu University, Chengdu 610041, China
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Gao S, Yang L, Yang X, Xiong Y, Fu W, Li J, Yin S. Sirtuin 7 is essential for the survival and synthesis of oestrogen in yak (Bos grunniens) cumulus granulosa cells. Reprod Domest Anim 2023; 58:323-332. [PMID: 36305218 DOI: 10.1111/rda.14289] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Accepted: 10/21/2022] [Indexed: 02/07/2023]
Abstract
Cumulus granulosa cells (CGCs) are a type of important ovarian somatic cells that carries out various functions related to oogenesis, follicular development and embryogenesis. The study on the development and function of CGCs facilitates the understanding of reproductive regulation in female animals. Sirtuin 7 (SIRT7) is a member of the sirtuin family of NAD+-dependent deacetylases mediating numerous biological processes. In this study, we detected the localization of SIRT7 in yak ovaries as well as explored the function of SIRT7 in yak CGCs. The results revealed that the SIRT7 protein was mainly localized in the cytoplasm of oocytes, granulosa cells and theca cells. The knockdown of SIRT7 in yak CGCs repressed cell proliferation and impacted the expressions of several apoptosis-related genes. Furthermore, oestrogen synthesis was also inhibited in SIRT7-deficient yak CGCs. The expressions of several sterogenesis-related genes decreased significantly following SIRT7 knockdown. In addition, the lack of SIRT7 in yak CGCs resulted in decreased levels of the TGFB/SMAD family members TGFB1, TGFBR1 SMAD2 and SMAD3. Moreover, the activation of the TGFB/SMAD pathway by adding TGFB/SMAD pathway activator SRI-011381 partially rescued the level of oestrogen secreted by SIRT7-deficient yak CGCs, as well as the expressions of steroidogenesis-related genes NR5A1 and CYP19A1. This research is the first to focus on the role of SIRT7 in yak ovary, and the outcomes offer new insights into the mechanism governing yak reproduction.
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Affiliation(s)
- Shaoshuai Gao
- College of Animal & Veterinary, Southwest Minzu University, Chengdu, Sichuan, China
| | - Liuqing Yang
- College of Animal & Veterinary, Southwest Minzu University, Chengdu, Sichuan, China
| | - Xue Yang
- College of Animal & Veterinary, Southwest Minzu University, Chengdu, Sichuan, China
| | - Yan Xiong
- College of Animal & Veterinary, Southwest Minzu University, Chengdu, Sichuan, China.,Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Chengdu, Sichuan, China
| | - Wei Fu
- College of Animal & Veterinary, Southwest Minzu University, Chengdu, Sichuan, China.,Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Chengdu, Sichuan, China
| | - Jian Li
- College of Animal & Veterinary, Southwest Minzu University, Chengdu, Sichuan, China.,Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Chengdu, Sichuan, China
| | - Shi Yin
- College of Animal & Veterinary, Southwest Minzu University, Chengdu, Sichuan, China.,Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization, Ministry of Education, Chengdu, Sichuan, China.,Key Laboratory of Modem Technology (Southwest Minzu University), State Ethnic Affairs Commission, Chengdu, Sichuan, China
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Choi J, Kim W, Yoon H, Lee J, Jun JH. Dynamic Oxygen Conditions Promote the Translocation of HIF-1 α to the Nucleus in Mouse Blastocysts. BIOMED RESEARCH INTERNATIONAL 2021; 2021:5050527. [PMID: 34608438 PMCID: PMC8487385 DOI: 10.1155/2021/5050527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 08/23/2021] [Accepted: 09/01/2021] [Indexed: 11/17/2022]
Abstract
Oxygen tension is one of the most critical factors for mammalian embryo development and its survival. The HIF protein is an essential transcription factor that activated under hypoxic conditions. In this study, we evaluated the effect of dynamic oxygen conditions on the expression of embryonic genes and translocation of hypoxia-inducible factor-1α (HIF-1α) in cultured mouse blastocysts. Two-pronuclear (2PN) zygotes harvested from ICR mice were subjected to either high oxygen (HO; 20%), low oxygen (LO; 5%), or dynamic oxygen (DO; 5% to 2%) conditions. In the DO group, PN zygotes were cultured in 5% O2 from days 1 to 3 and then in 2% O2 till day 5 after hCG injection. On day 5, the percentage of blastocysts in the cultured embryos from each group was estimated, and the embryos were also subjected to immunocytochemical and gene expression analysis. We found that the percentage of blastocysts was similar among the experimental groups; however, the percentage of hatching blastocysts in the DO and LO groups was significantly higher than that in the HO group. The total cell number of blastocysts in the DO group was significantly higher than that of both the HO and LO groups. Further, gene expression analysis revealed that the expression of genes related to the embryonic development was significantly higher in the DO group than that in the HO and LO groups. Interestingly, HIF-1α mRNA expression did not significantly differ; however, HIF-1α protein translocation from the cytoplasm to the nucleus was significantly higher in the DO group than in the HO and LO groups. Our study suggests that dynamic oxygen concentrations increase the developmental capacity in mouse preimplantation embryos through activation of the potent transcription factor HIF-1α.
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Affiliation(s)
- Jungwon Choi
- Department of Senior Healthcare BK21 Plus Program, Graduate School, Eulji University, Seongnam, Republic of Korea
- Department of Biomedical Laboratory Science, Eulji University, Seongnam, Republic of Korea
| | - Wontae Kim
- Department of Biomedical Laboratory Science, Eulji University, Seongnam, Republic of Korea
- Department of Biomedical Laboratory Science, Graduate School, Eulji University, Seongnam, Republic of Korea
| | - Hyejin Yoon
- Department of Senior Healthcare BK21 Plus Program, Graduate School, Eulji University, Seongnam, Republic of Korea
- Department of Biomedical Laboratory Science, Eulji University, Seongnam, Republic of Korea
| | - Jaewang Lee
- Department of Biomedical Laboratory Science, Eulji University, Seongnam, Republic of Korea
- Department of Biomedical Laboratory Science, Graduate School, Eulji University, Seongnam, Republic of Korea
| | - Jin Hyun Jun
- Department of Senior Healthcare BK21 Plus Program, Graduate School, Eulji University, Seongnam, Republic of Korea
- Department of Biomedical Laboratory Science, Eulji University, Seongnam, Republic of Korea
- Department of Biomedical Laboratory Science, Graduate School, Eulji University, Seongnam, Republic of Korea
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