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Wang J, Wang L, Wang Z, Lv M, Fu J, Zhang Y, Qiu P, Shi D, Luo C. Vitamin C down-regulates the H3K9me3-dependent heterochromatin in buffalo fibroblasts via PI3K/PDK1/SGK1/KDM4A signal axis. Theriogenology 2023; 200:114-124. [PMID: 36805248 DOI: 10.1016/j.theriogenology.2023.02.001] [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: 11/22/2022] [Revised: 02/02/2023] [Accepted: 02/02/2023] [Indexed: 02/11/2023]
Abstract
The success of reprogramming is dependent on the reprogramming factors enriched in the cytoplasm of recipient oocytes and the potential of donor nucleus to be reprogrammed. Histone 3 lysine 9 trimethylation (H3K9me3) was identified as a major epigenetic barrier impeding complete reprogramming. Treating donor cell with vitamin C (Vc) can enhance the developmental potential of cloned embryos, but the underlying mechanisms still need to be elucidated. In this study, we found that 20μg/mL Vc could promote proliferation and inhibit apoptosis of BFFs, as well as down-regulate the H3K9me3-dependent heterochromatin and increase chromatin accessibility. Inhibited the expression of KDM4A resulted in increasing apoptosis rate and the H3K9me3-dependent heterochromatin, which can be restored by Vc. Moreover, Vc up-regulated the expression of KDM4A through PI3K/PDK1/SGK1 pathway. Inhibiting any factor in the signal axis of this PI3K pathway not only suppressed the activity of KDM4A but also substantially increased the level of H3K9me3 modification and the expression of the HP1α protein. Finally, Vc can rescue those negative effects induced by the blocking the PI3K/PDK1/SGK1 pathway. Collectively, Vc can down-regulate the H3K9me3-dependent heterochromatin in BFFs via PI3K/PDK1/SGK1/KDM4A signal axis, suggesting that Vc can turn the chromatin status of donor cells to be reprogrammed more easily.
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Affiliation(s)
- Jinling Wang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi University, 75 Xiuling Road, Nanning, 530005, China; College of Animal Science and Technology, Guangxi University, 75 Xiuling Road, Nanning, 530005, China
| | - Lei Wang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi University, 75 Xiuling Road, Nanning, 530005, China; College of Animal Science and Technology, Guangxi University, 75 Xiuling Road, Nanning, 530005, China
| | - Zhiqiang Wang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi University, 75 Xiuling Road, Nanning, 530005, China; Guangxi Academy of Medical Sciences and the People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, 530021, China
| | - Meiyun Lv
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi University, 75 Xiuling Road, Nanning, 530005, China; College of Animal Science and Technology, Guangxi University, 75 Xiuling Road, Nanning, 530005, China
| | - Jiayuan Fu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi University, 75 Xiuling Road, Nanning, 530005, China; College of Animal Science and Technology, Guangxi University, 75 Xiuling Road, Nanning, 530005, China
| | - Yunchuan Zhang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi University, 75 Xiuling Road, Nanning, 530005, China; College of Animal Science and Technology, Guangxi University, 75 Xiuling Road, Nanning, 530005, China
| | - Peng Qiu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi University, 75 Xiuling Road, Nanning, 530005, China; College of Animal Science and Technology, Guangxi University, 75 Xiuling Road, Nanning, 530005, China
| | - Deshun Shi
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi University, 75 Xiuling Road, Nanning, 530005, China; College of Animal Science and Technology, Guangxi University, 75 Xiuling Road, Nanning, 530005, China.
| | - Chan Luo
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi Key Laboratory of Animal Reproduction, Breeding and Disease Control, Guangxi University, 75 Xiuling Road, Nanning, 530005, China; College of Animal Science and Technology, Guangxi University, 75 Xiuling Road, Nanning, 530005, China.
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Mechanistic insights into KDM4A driven genomic instability. Biochem Soc Trans 2021; 49:93-105. [PMID: 33492339 PMCID: PMC7925003 DOI: 10.1042/bst20191219] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 12/11/2020] [Accepted: 12/15/2020] [Indexed: 12/19/2022]
Abstract
Alterations in global epigenetic signatures on chromatin are well established to contribute to tumor initiation and progression. Chromatin methylation status modulates several key cellular processes that maintain the integrity of the genome. KDM4A, a demethylase that belongs to the Fe-II dependent dioxygenase family that uses α-ketoglutarate and molecular oxygen as cofactors, is overexpressed in several cancers and is associated with an overall poor prognosis. KDM4A demethylates lysine 9 (H3K9me2/3) and lysine 36 (H3K36me3) methyl marks on histone H3. Given the complexity that exists with these marks on chromatin and their effects on transcription and proliferation, it naturally follows that demethylation serves an equally important role in these cellular processes. In this review, we highlight the role of KDM4A in transcriptional modulation, either dependent or independent of its enzymatic activity, arising from the amplification of this demethylase in cancer. KDM4A modulates re-replication of distinct genomic loci, activates cell cycle inducers, and represses proteins involved in checkpoint control giving rise to proliferative damage, mitotic disturbances and chromosomal breaks, ultimately resulting in genomic instability. In parallel, emerging evidence of non-nuclear substrates of epigenetic modulators emphasize the need to investigate the role of KDM4A in regulating non-nuclear substrates and evaluate their contribution to genomic instability in this context. The existence of promising KDM-specific inhibitors makes these demethylases an attractive target for therapeutic intervention in cancers.
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Wagner S, Waldman M, Arora S, Wang S, Scott V, Islam K. Allele-Specific Inhibition of Histone Demethylases. Chembiochem 2019; 20:1133-1138. [PMID: 30618116 DOI: 10.1002/cbic.201800756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2018] [Indexed: 12/21/2022]
Abstract
Histone demethylases play a critical role in mammalian gene expression by removing methyl groups from lysine residues in degree- and site-specific manner. To specifically interrogate members and isoforms of this class of enzymes, we have developed demethylase variants with an expanded active site. The mutant enzymes are capable of performing lysine demethylation with wild-type proficiency, but are sensitive to inhibition by cofactor-competitive molecules embellished with a complementary steric "bump". The selected inhibitors show more than 20-fold selectivity over the wild-type demethylase, thus overcoming issues typical to pharmacological and genetic approaches. The mutant-inhibitor pairs are shown to act on a physiologically relevant full-length substrate. By engineering a conserved amino acid to achieve member-specific perturbation, this study provides a general approach for studying histone demethylases in diverse cellular processes.
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Affiliation(s)
- Shana Wagner
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| | - Megan Waldman
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| | - Simran Arora
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| | - Sinan Wang
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| | - Valerie Scott
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| | - Kabirul Islam
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
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