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Kalinderi K, Kalinderis M, Papaliagkas V, Fidani L. The Reproductive Lifespan of Ovarian Follicle. Reprod Sci 2024:10.1007/s43032-024-01606-8. [PMID: 38816594 DOI: 10.1007/s43032-024-01606-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 05/27/2024] [Indexed: 06/01/2024]
Abstract
The functional unit within mammalian ovaries is the ovarian follicle. The development of the ovarian follicle is a lengthy process beginning from the time of embryogenesis, passing through multiple different stages of maturation. The purpose of this review is to describe the most basic events in the journey of ovarian follicle development, discussing the importance of ovarian reserve and highlighting the role of several factors that affect oocyte quality and quantity during aging including hormonal, genetic and epigenetic factors. Novel, promising anti-aging strategies are also discussed.
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Affiliation(s)
- Kallirhoe Kalinderi
- Laboratory of Medical Biology-Genetics, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, GR-54124, Greece.
| | - Michail Kalinderis
- Department of Obstetrics and Gynaecology, St George's University Hospital NHS Trust, Blackshaw Road, Tooting, London, SW17 0QT, UK
| | - Vasileios Papaliagkas
- Department of Biomedical Sciences, School of Health Sciences, International Hellenic University, Thessaloniki, 57400, Greece
| | - Liana Fidani
- Laboratory of Medical Biology-Genetics, School of Medicine, Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, GR-54124, Greece
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2
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Uysal F, Sukur G, Bozdemir N, Cinar O. Unveiling the impact of DNA methylation machinery: Dnmt1 and Dnmt3a in orchestrating oocyte development and cellular homeostasis. Genesis 2024; 62:e23579. [PMID: 37985411 DOI: 10.1002/dvg.23579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 10/27/2023] [Accepted: 11/02/2023] [Indexed: 11/22/2023]
Abstract
DNA methylation can be considered the most prominent in controlling the gene expression responsible for the balance between cell proliferation and cell death. In this study, we aimed to analyze the distinct contributions of Dnmt1 and Dnmt3a enzymes in oocyte maturation, survival, autophagy, reactive oxygen species (ROS) production, and compensation capacity of Dnmt3b and Dnmt3l enzymes in mouse oocytes. Following confirming the suppression of Dnmt1or Dnmt3a through siRNA application, the assessment involved immunofluorescence staining for Dnmts, 5mC, p62, and ROS levels. Cell death rates showed a noticeable increase while oocyte maturation rates exhibited significant reduction. Global DNA methylation showed a decline, concomitant with elevated p62 and ROS levels upon Dnmt1 or Dnmt3a knockdown. Remarkably, silencing of Dnmt1 led to an upsurge in Dnmt3a expression, whereas Dnmt3a knockdown triggered an increase in Dnmt1 levels. Furthermore, Dnmt3l expression exhibited a notable decrease after silencing of either Dnmt1 or Dnmt3a, while Dnmt3b levels remained comparable between control and siRNA-treated groups. Collectively, this study underscores the pivotal roles of Dnmt1 and Dnmt3a in orchestrating various facets of oocyte development, encompassing maturation, survival, autophagy, and ROS production. These findings offer valuable insights into the intricate regulatory network governed by DNA methylation machinery within the context of oocyte physiology.
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Affiliation(s)
- Fatma Uysal
- Department of Histology and Embryology, Ankara Medipol University School of Medicine, Ankara, Turkey
| | - Gozde Sukur
- Department of Histology and Embryology, Ankara University School of Medicine, Ankara, Turkey
| | - Nazlican Bozdemir
- Department of Histology and Embryology, Ankara Medipol University School of Medicine, Ankara, Turkey
| | - Ozgur Cinar
- Department of Histology and Embryology, Ankara University School of Medicine, Ankara, Turkey
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3
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Luo L, Li J, Sun Y, Lv Y, Liu J, Li Y, Zhang C, Zhang W. Maternal genetic intergenerational and transgenerational effects on hormone synthesis in ovarian granulosa cells of offspring exposed to cadmium during pregnancy. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 263:115278. [PMID: 37481859 DOI: 10.1016/j.ecoenv.2023.115278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 07/05/2023] [Accepted: 07/17/2023] [Indexed: 07/25/2023]
Abstract
This study aimed to investigate the maternally inherited intergenerational and transgenerational effects of cadmium (Cd) exposure on steroid hormone synthesis in the ovarian granulosa cells (GCs) of offspring rats. F1 rats were obtained by mating adult female Sprague-Dawley rats with healthy adult male rats and were exposed to 0, 0.5, 2.0, and 8.0 mg/kg CdCl2 during pregnancy. The adult female rats (PND 56) were mated with healthy adult male rats to produce F2 and F3 rats. The serum progesterone (Pg) and estradiol (E2) levels of the F2 adult female rats were decreased, while those of F3 rats were significantly increased. Moreover, hormone synthesis-related genes had different expression patterns in the F2 and F3 generations. F2 and F3 rat ovarian GCs exhibited altered miRNA expression profiles and DNA methylation patterns. Validation of miRNAs that regulate hormone synthesis-related genes in the cAMP/PKA signaling pathway suggested that miR-124-3p was downregulated in F2 and F3 rats, while miR-133a-5p and miR-150-5p were upregulated in F2 rats and downregulated in F3 rats. In summary, 1) there are maternal genetic intergenerational (GCs hormone synthesis disorder) and transgenerational (GCs hormone synthesis function repair change) effects on hormone synthesis function changes in offspring GCs induced by Cd exposure during pregnancy. 2) Changes in miRNAs and DNA methylation modifications associated with the genetic effects of altered hormone synthesis function in offspring GCs induced by Cd exposure during pregnancy are important. 3) Under the current environmental level of Cd exposure, the possible risk of maternal genetic intergenerational and transgenerational effects of offspring ovarian toxicity should be strongly considered.
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Affiliation(s)
- Lingfeng Luo
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Fuzhou 350122, Fujian Province, China
| | - Jingwen Li
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Fuzhou 350122, Fujian Province, China
| | - Yi Sun
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Fuzhou 350122, Fujian Province, China; Key Laboratory of Environment and Female Reproductive Health, The Eighth Affiliated Hospital, Sun Yat-sen University, Shenzhen, China
| | - Yake Lv
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Fuzhou 350122, Fujian Province, China
| | - Jin Liu
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Fuzhou 350122, Fujian Province, China
| | - Yuchen Li
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Fuzhou 350122, Fujian Province, China
| | - Chenyun Zhang
- School of Health Management, Fujian Medical University, Fuzhou 350122, Fujian Province, China.
| | - Wenchang Zhang
- Department of Preventive Medicine, Fujian Provincial Key Laboratory of Environmental Factors and Cancer, Key Laboratory of Environment and Health, School of Public Health, Fujian Medical University, Fuzhou 350122, Fujian Province, China.
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Taatjes DJ, Roth J. In focus in HCB. Histochem Cell Biol 2023; 159:309-311. [PMID: 36977938 DOI: 10.1007/s00418-023-02190-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Affiliation(s)
- Douglas J Taatjes
- Department of Pathology and Laboratory Medicine, Larner College of Medicine, University of Vermont, Burlington, VT, 05405, USA.
| | - Jürgen Roth
- University of Zurich, CH-8091, Zurich, Switzerland
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High-fat diet induced obesity alters Dnmt1 and Dnmt3a levels and global DNA methylation in mouse ovary and testis. Histochem Cell Biol 2023; 159:339-352. [PMID: 36624173 DOI: 10.1007/s00418-022-02173-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/13/2022] [Indexed: 01/11/2023]
Abstract
Obesity impairs reproductive capacity, and the link between imprinting disorders and obesity has been discussed in many studies. Recent studies indicate that a high-fat diet may cause epigenetic changes in maternal and paternal genes, which may be transmitted to offspring and negatively affect their development. On this basis, our study aims to reveal the changes in DNA methylation and DNA methyltransferase enzymes in the ovaries and testes of C57BL/6 mice fed a high-fat diet and created a model of obesity, by comparing them with the control group. For this purpose, we demonstrated the presence and quantitative differences of DNA methyltransferase 1 and DNA methyltransferase 3a enzymes as well as global DNA methylation in ovaries and testis of C57BL/6 mice fed a high-fat diet by using immunohistochemistry and western blot methods. We found that a high-fat diet induces the levels of Dnmt1 and Dnmt3a proteins (p < 0.05). We observed increased global DNA methylation in testes but, interestingly, decreased global DNA methylation in ovaries. We think that our outcomes have significant value to demonstrate the effects of obesity on ovarian follicle development and testicular spermatogenesis and may bring a new perspective to obesity-induced infertility treatments. Additionally, to the best of our knowledge, this is the first study to document dynamic alteration of Dnmt1 and Dnmt3a as well as global DNA methylation patterns during follicle development in healthy mouse ovaries.
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Wang F, Qin Z, Li Z, Yang S, Gao T, Sun L, Wang D. Dnmt3aa but Not Dnmt3ab Is Required for Maintenance of Gametogenesis in Nile Tilapia ( Oreochromis niloticus). Int J Mol Sci 2021; 22:ijms221810170. [PMID: 34576333 PMCID: PMC8469005 DOI: 10.3390/ijms221810170] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/13/2021] [Accepted: 09/16/2021] [Indexed: 12/20/2022] Open
Abstract
Dnmt3a, a de novo methyltransferase, is essential for mammalian germ line DNA methylation. Only one Dnmt3a is identified in mammals, and homozygous mutants of Dnmt3a are lethal, while two Dnmt3a paralogs, dnmt3aa and dnmt3ab, are identified in teleosts due to the third round of genome duplication, and homozygous mutants of dnmt3aa and dnmt3ab are viable in zebrafish. The expression patterns and roles of dnmt3aa and dnmt3ab in gonadal development remain poorly understood in teleosts. In this study, we elucidated the precise expression patterns of dnmt3aa and dnmt3ab in tilapia gonads. Dnmt3aa was highly expressed in oogonia, phase I and II oocytes and granulosa cells in ovaries and spermatogonia and spermatocytes in testes, while dnmt3ab was mainly expressed in ovarian granulosa cells and testicular spermatocytes. The mutation of dnmt3aa and dnmt3ab was achieved by CRISPR/Cas9 in tilapia. Lower gonadosomatic index (GSI), increased apoptosis of oocytes and spermatocytes and significantly reduced sperm quality were observed in dnmt3aa−/− mutants, while normal gonadal development was observed in dnmt3ab−/− mutants. Consistently, the expression of apoptotic genes was significantly increased in dnmt3aa−/− mutants. In addition, the 5-methylcytosine (5-mC) level in dnmt3aa−/− gonads was decreased significantly, compared with that of dnmt3ab−/− and wild type (WT) gonads. Taken together, our results suggest that dnmt3aa, not dnmt3ab, plays important roles in maintaining gametogenesis in teleosts.
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Affiliation(s)
| | | | | | | | | | - Lina Sun
- Correspondence: (L.S.); (D.W.); Tel.: +86-23-6825-3702 (D.W.)
| | - Deshou Wang
- Correspondence: (L.S.); (D.W.); Tel.: +86-23-6825-3702 (D.W.)
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Uysal F, Ozturk S. The loss of global DNA methylation due to decreased DNMT expression in the postnatal mouse ovaries may associate with infertility emerging during ovarian aging. Histochem Cell Biol 2020; 154:301-314. [PMID: 32514790 DOI: 10.1007/s00418-020-01890-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2020] [Indexed: 12/15/2022]
Abstract
Ovarian aging is one of the main causes of female infertility, and its molecular background is still largely unknown. As DNA methylation regulates many oogenesis/folliculogenesis-related genes, the expression levels and cellular localizations of DNA methyltransferases (DNMTs) playing key roles in this process is important in the ovaries from early to aged terms. In the present study, we aimed to evaluate the spatial and temporal expression of the Dnmt1, Dnmt3a, Dnmt3b, and Dnmt3l genes as well as global DNA methylation levels in the mouse ovaries during aging. For this purpose, the following groups were created: young (1- and 2-week old; n = 3 from each week), prepubertal (3- and 4-week-old; n = 3 from each week), pubertal (5- and 6-week-old; n = 3 from each week), postpubertal (16- and 18-week-old; n = 3 from each week), and aged (52-, 60- and 72-week-old; n = 3 from each week). We found here that Dnmt1, Dnmt3a, and Dnmt3l genes' expression at mRNA and protein levels as well as global DNA methylation profiles were gradually and significantly decreased in the postnatal ovaries from young to aged groups (P < 0.05). In contrast, there was a remarkable increase of Dnmt3b expression in the pubertal, postpubertal and aged groups (P < 0.05). Our findings suggest that the significantly altered DNMT expression and global DNA methylation levels during ovarian aging may contribute to female infertility development at the later terms of lifespan. Also, new researches are required to determine the molecular biological mechanism(s) that how altered DNMT expression and decreased DNA methylation lead to ovarian aging.
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Affiliation(s)
- Fatma Uysal
- Department of Histology and Embryology, Akdeniz University School of Medicine, 07070, Antalya, Turkey
- Department of Histology and Embryology, Ankara University School of Medicine, 06100, Ankara, Turkey
| | - Saffet Ozturk
- Department of Histology and Embryology, Akdeniz University School of Medicine, 07070, Antalya, Turkey.
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Zhang J, Yang C, Wu C, Cui W, Wang L. DNA Methyltransferases in Cancer: Biology, Paradox, Aberrations, and Targeted Therapy. Cancers (Basel) 2020; 12:cancers12082123. [PMID: 32751889 PMCID: PMC7465608 DOI: 10.3390/cancers12082123] [Citation(s) in RCA: 101] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 07/14/2020] [Accepted: 07/20/2020] [Indexed: 02/07/2023] Open
Abstract
DNA methyltransferases are an essential class of modifiers in epigenetics. In mammals, DNMT1, DNMT3A and DNMT3B participate in DNA methylation to regulate normal biological functions, such as embryo development, cell differentiation and gene transcription. Aberrant functions of DNMTs are frequently associated with tumorigenesis. DNMT aberrations usually affect tumor-related factors, such as hypermethylated suppressor genes and genomic instability, which increase the malignancy of tumors, worsen the prognosis for patients, and greatly increase the difficulty of cancer therapy. However, the impact of DNMTs on tumors is still controversial, and therapeutic approaches targeting DNMTs are still under exploration. Here, we summarize the biological functions and paradoxes associated with DNMTs and we discuss some emerging strategies for targeting DNMTs in tumors, which may provide novel ideas for cancer therapy.
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Affiliation(s)
- Jiayu Zhang
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, China; (J.Z.); (C.Y.); (C.W.)
- Benxi Institute of Pharmaceutical Research, Shenyang Pharmaceutical University, Benxi 117004, China
| | - Cheng Yang
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, China; (J.Z.); (C.Y.); (C.W.)
- Benxi Institute of Pharmaceutical Research, Shenyang Pharmaceutical University, Benxi 117004, China
| | - Chunfu Wu
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, China; (J.Z.); (C.Y.); (C.W.)
- Benxi Institute of Pharmaceutical Research, Shenyang Pharmaceutical University, Benxi 117004, China
| | - Wei Cui
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, China; (J.Z.); (C.Y.); (C.W.)
- Correspondence: (W.C.); (L.W.)
| | - Lihui Wang
- Department of Pharmacology, Shenyang Pharmaceutical University, Shenyang 110016, China; (J.Z.); (C.Y.); (C.W.)
- Benxi Institute of Pharmaceutical Research, Shenyang Pharmaceutical University, Benxi 117004, China
- Correspondence: (W.C.); (L.W.)
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Wang Y, Shi Y, Tao M, Zhuang S, Liu N. Peritoneal fibrosis and epigenetic modulation. Perit Dial Int 2020; 41:168-178. [PMID: 32662737 DOI: 10.1177/0896860820938239] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Peritoneal dialysis (PD) is an effective treatment for patients with end-stage renal disease. However, peritoneal fibrosis (PF) is a common complication that ultimately leads to ultrafiltration failure and discontinuation of PD after long-term PD therapy. There is currently no effective therapy to prevent or delay this pathologic process. Recent studies have reported epigenetic modifications involved in PF, and accumulating evidence suggests that epigenetic therapies may have the potential to prevent and treat PF clinically. The major epigenetic modifications in PF include DNA methylation, histone modification, and noncoding RNAs. The mechanisms of epigenetic regulation in PF are complex, predominantly involving modification of signaling molecules, transcriptional factors, and genes. This review will describe the mechanisms of epigenetic modulation in PF and discuss the possibility of targeting them to prevent and treat this complication.
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Affiliation(s)
- Yi Wang
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, China
| | - Yingfeng Shi
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, China
| | - Min Tao
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, China
| | - Shougang Zhuang
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, China.,Department of Medicine, Rhode Island Hospital and Alpert Medical School, Brown University, Providence, RI, USA
| | - Na Liu
- Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, China
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Soto-Heras S, Menéndez-Blanco I, Catalá MG, Izquierdo D, Thompson JG, Paramio MT. Biphasic in vitro maturation with C-type natriuretic peptide enhances the developmental competence of juvenile-goat oocytes. PLoS One 2019; 14:e0221663. [PMID: 31442286 PMCID: PMC6707569 DOI: 10.1371/journal.pone.0221663] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 08/12/2019] [Indexed: 12/21/2022] Open
Abstract
In vitro embryo production success in juvenile animals is compromised due to their intrinsic lower oocyte quality. Conventional in vitro maturation (IVM) impairs oocyte competence by inducing spontaneous meiotic resumption. A series of experiments were performed to determine if maintaining meiotic arrest during a pre-maturation culture phase (pre-IVM) prior to conventional IVM improves oocyte competence of juvenile-goat (2 months old) cumulus-oocyte complexes (COCs). In experiment 1, COCs were cultured with C-type natriuretic peptide (CNP; 0, 50, 100, 200 nM) for 6 and 8 h. Nuclear stage was assessed, revealing no differences in the incidence of germinal vesicle (GV) breakdown. In experiment 2, the same CNP concentrations were assessed plus 10 nM estradiol, the known upstream agonist activating expression of NPR2, the exclusive receptor of CNP. CNP (200 nM) plus estradiol increased the rate of oocytes at GV stage at 6 h compared to control group (74.7% vs 28.3%; P<0.05) with predominantly condensed chromatin configuration. In experiment 3, relative mRNA quantification revealed NPR2 expression was down-regulated after pre-IVM (6 h). In experiment 4, analysis of transzonal projections indicated that pre-IVM maintained cumulus-oocyte communication after oocyte recovery. For experiments 5 and 6, biphasic IVM (6 h pre-IVM with CNP and estradiol, plus 24 h IVM) and control IVM (24 h) were compared. Biphasic IVM increased intra-oocyte glutathione and decreased ROS, up-regulated DNA-methyltransferase 1 and pentraxin 3 expression and led to an increase in rate of blastocyst development compared to control group (30.2% vs 17.2%; P<0.05). In conclusion, a biphasic IVM, including a pre-IVM with CNP, maintains oocyte meiotic arrest for 6 h and enhances the embryo developmental competence of oocytes from juvenile goats.
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Affiliation(s)
- Sandra Soto-Heras
- Departament de Ciència Animal i dels Aliments, Facultat de Veterinària, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | - Irene Menéndez-Blanco
- Departament de Ciència Animal i dels Aliments, Facultat de Veterinària, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | - Maria-Gracia Catalá
- Departament de Ciència Animal i dels Aliments, Facultat de Veterinària, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | - Dolors Izquierdo
- Departament de Ciència Animal i dels Aliments, Facultat de Veterinària, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
| | - Jeremy G. Thompson
- Robinson Research Institute, School of Paedriatics and Reproductive Health, The University of Adelaide, Adelaide, South Australia, Australia
- Adelaide Medical School, The University of Adelaide, Adelaide, South Australia, Australia
- Australian Research Council Centre of Excellence for Nanoscale BioPhotonics and Institute for Photonics and Advanced Sensing, Davies Research Centre, The University of Adelaide, Adelaide, South Australia, Australia
| | - Maria-Teresa Paramio
- Departament de Ciència Animal i dels Aliments, Facultat de Veterinària, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, Spain
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The Effect and Mechanism of TLR9/KLF4 in FFA-Induced Adipocyte Inflammation. Mediators Inflamm 2018; 2018:6313484. [PMID: 30662369 PMCID: PMC6312605 DOI: 10.1155/2018/6313484] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 10/01/2018] [Accepted: 10/15/2018] [Indexed: 12/24/2022] Open
Abstract
Objective Current research has reported that obesity is a chronic inflammatory state, which is closely related with excessive accumulation of free fatty acid, while the specific mechanism that high level of FFA causes inflammation is not very clear. Thus, our research intended to observe the high FFA effects on TLR9/KLF4 expression and the downstream inflammatory factors, to explore the mechanism of inflammatory response suppressed by TLR9/KLF4. Methods qRT-PCR and Western blot were used to detect the mRNA and protein expression levels of TLR9, KLF4, and key inflammation-related factors. ELISA was used to detect the release level of inflammatory cytokines. The triglyceride (TG) and glucose (GLU) testing cassettes were used to detect the TG and GLU levels in culture medium. Results In the omental tissue of obese individuals (OB), we found that TLR9, KLF4, mRNA, and the protein expression levels were lower than those of the normal weight control (NC) group. Similarly, in the omental tissue of high-fat diet (HFD) rats, we found that the mRNA expression levels of TLR9 and KLF4 were lower than those of the normal diet control group. In mature adipocytes, we found that KLF4 played an important anti-inflammatory role; moreover, PA can promote the development of inflammation by inhibiting KLF4 expression; TLR9 has a positive regulation function on KLF4 expression, but unrelated to PA. Conclusions TLR9/KLF4 is involved in regulating FFA-induced adipocyte inflammation.
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