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Peng X, Chen Y. The emerging role of circadian rhythms in the development and function of thermogenic fat. Front Endocrinol (Lausanne) 2023; 14:1175845. [PMID: 37293491 PMCID: PMC10244810 DOI: 10.3389/fendo.2023.1175845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 04/06/2023] [Indexed: 06/10/2023] Open
Abstract
Circadian rhythms regulate many biological processes in response to ambient influences. A disrupted circadian rhythm has been shown to be associated with obesity and obesity-related metabolic disorders. Thermogenic fat, including brown and beige fat, may play an important role in this process since it displays a high capacity to burn fat and release the stored energy as heat, contributing to the combat against obesity and its associated metabolic disorders. In this review, we summarize the relationship between the circadian clock and thermogenic fat and the prominent mechanisms which are involved in the regulation of the development and function of thermogenic fat by circadian rhythms, which may provide novel therapeutics for the prevention and treatment of metabolic diseases by targeting thermogenic fat in a circadian manner.
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Affiliation(s)
- Xuemin Peng
- Division of Endocrinology, Internal Medicine, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
- Laboratory of Endocrinology, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
| | - Yong Chen
- Division of Endocrinology, Internal Medicine, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
- Laboratory of Endocrinology, Tongji Hospital, Huazhong University of Science and Technology, Wuhan, China
- Branch of National Clinical Research Center for Metabolic Diseases, Hubei, China
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Du K, Chen GH, Bai X, Chen L, Hu SQ, Li YH, Wang GZ, He JW, Lai SJ. Dynamics of transcriptome and chromatin accessibility revealed sequential regulation of potential transcription factors during the brown adipose tissue whitening in rabbits. Front Cell Dev Biol 2022; 10:981661. [PMID: 36225319 PMCID: PMC9548568 DOI: 10.3389/fcell.2022.981661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 09/07/2022] [Indexed: 11/13/2022] Open
Abstract
Brown adipose tissue (BAT) represents a valuable target for treating obesity in humans. BAT losses of thermogenic capacity and gains a “white adipose tissue-like (WAT-like)” phenotype (BAT whitening) under thermoneutral environments, which could lead to potential low therapy responsiveness in BAT-based obesity treatments. However, the epigenetic mechanisms of BAT whitening remain largely unknown. In this study, BATs were collected from rabbits at day0 (D0), D15, D85, and 2 years (Y2). RNA-sequencing (RNA-seq) and the assay for transposase-accessible chromatin with high-throughput sequencing (ATAC-seq) were performed to investigate transcriptome and chromatin accessibility of BATs at the four whitening stages, respectively. Our data showed that many genes and chromatin accessible regions (refer to as “peaks”) were identified as significantly changed during BAT whitening in rabbits. The BAT-selective genes downregulated while WAT-selective genes upregulated from D0 to Y2, and the de novo lipogenesis-related genes reached the highest expression levels at D85. Both the highly expressed genes and accessible regions in Y2 were significantly enriched in immune response-related signal pathways. Analysis of different relationships between peaks and their nearby genes found an increased proportion of the synchronous changes between chromatin accessibility and gene expression during BAT whitening. The synergistic changes between the chromatin accessibility of promoter and the gene expression were found in the key adipose genes. The upregulated genes which contained increased peaks were significantly enriched in the PI3K-Akt signaling pathway, steroid biosynthesis, TGF-beta signaling pathway, osteoclast differentiation, and dilated cardiomyopathy. Moreover, the footprinting analysis suggested that sequential regulation of potential transcription factors (TFs) mediated the loss of thermogenic phenotype and the gain of a WAT-like phenotype of BAT. In conclusion, our study provided the transcriptional and epigenetic frameworks for understanding BAT whitening in rabbits for the first time and might facilitate potential insights into BAT-based obesity treatments.
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Affiliation(s)
- Kun Du
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, China
| | - Guan-He Chen
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, China
| | - Xue Bai
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, China
| | - Li Chen
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, China
| | - Shen-Qiang Hu
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, China
| | - Yan-Hong Li
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, China
| | - Guo-Ze Wang
- School of Public Health, The Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University, Guiyang, China
| | - Jing-Wei He
- Sichuan Animal Husbandry Station, Chengdu, China
| | - Song-Jia Lai
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, Sichuan Agricultural University, Chengdu, China
- *Correspondence: Song-Jia Lai,
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Noh SG, Jung HJ, Kim S, Arulkumar R, Kim DH, Park D, Chung HY. Regulation of Circadian Genes Nr1d1 and Nr1d2 in Sex-Different Manners during Liver Aging. Int J Mol Sci 2022; 23:ijms231710032. [PMID: 36077427 PMCID: PMC9456386 DOI: 10.3390/ijms231710032] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 08/26/2022] [Accepted: 08/30/2022] [Indexed: 11/23/2022] Open
Abstract
Background: Circadian rhythm is associated with the aging process and sex differences; however, how age and sex can change circadian regulation systems remains unclear. Thus, we aimed to evaluate age- and sex-related changes in gene expression and identify sex-specific target molecules that can regulate aging. Methods: Rat livers were categorized into four groups, namely, young male, old male, young female, and old female, and the expression of several genes involved in the regulation of the circadian rhythm was confirmed by in silico and in vitro studies. Results: Gene Ontology and the Kyoto Encyclopedia of Genes and Genomes pathway enrichment analyses showed that the expression of genes related to circadian rhythms changed more in males than in females during liver aging. In addition, differentially expressed gene analysis and quantitative real-time polymerase chain reaction/western blotting analysis revealed that Nr1d1 and Nr1d2 expression was upregulated in males during liver aging. Furthermore, the expression of other circadian genes, such as Arntl, Clock, Cry1/2, Per1/2, and Rora/c, decreased in males during liver aging; however, these genes showed various gene expression patterns in females during liver aging. Conclusions: Age-related elevation of Nr1d1/2 downregulates the expression of other circadian genes in males, but not females, during liver aging. Consequently, age-related upregulation of Nr1d1/2 may play a more crucial role in the change in circadian rhythms in males than in females during liver aging.
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Affiliation(s)
- Sang Gyun Noh
- Interdisciplinary Research Program of Bioinformatics and Longevity Science, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
- Department of Pharmacy, College of Pharmacy, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
| | - Hee Jin Jung
- Department of Pharmacy, College of Pharmacy, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
| | - Seungwoo Kim
- Interdisciplinary Research Program of Bioinformatics and Longevity Science, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
- Department of Pharmacy, College of Pharmacy, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
| | - Radha Arulkumar
- Interdisciplinary Research Program of Bioinformatics and Longevity Science, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
- Department of Pharmacy, College of Pharmacy, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
| | - Dae Hyun Kim
- Department of Pharmacy, College of Pharmacy, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
| | - Daeui Park
- Department of Predictive Toxicology, Korea Institute of Toxicology, 141, Gajeong-ro, Yuseong-gu, Daejeon 34114, Korea
| | - Hae Young Chung
- Interdisciplinary Research Program of Bioinformatics and Longevity Science, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
- Department of Pharmacy, College of Pharmacy, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
- Correspondence: ; Tel.: +82-51-510-2814
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Ma H, Kang J, Fan W, He H, Huang F. ROR: Nuclear Receptor for Melatonin or Not? Molecules 2021; 26:molecules26092693. [PMID: 34064466 PMCID: PMC8124216 DOI: 10.3390/molecules26092693] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/28/2021] [Accepted: 05/03/2021] [Indexed: 12/14/2022] Open
Abstract
Whether the retinoic acid-related orphan receptor (ROR) is a nuclear receptor of melatonin remains controversial. ROR is inextricably linked to melatonin in terms of its expression, function, and mechanism of action. Additionally, studies have illustrated that melatonin functions analogous to ROR ligands, thereby modulating the transcriptional activity of ROR. However, studies supporting these interactions have since been withdrawn. Furthermore, recent crystallographic evidence does not support the view that ROR is a nuclear receptor of melatonin. Some other studies have proposed that melatonin indirectly regulates ROR activity rather than directly binding to ROR. This review aims to delve into the complex relationship of the ROR receptor with melatonin in terms of its structure, expression, function, and mechanism. Thus, we provide the latest evidence and views on direct binding as well as indirect regulation of ROR by melatonin, dissecting both viewpoints in-depth to provide a more comprehensive perspective on this issue.
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Affiliation(s)
- Haozhen Ma
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China; (H.M.); (J.K.); (W.F.)
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510080, China
| | - Jun Kang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China; (H.M.); (J.K.); (W.F.)
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510080, China
| | - Wenguo Fan
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China; (H.M.); (J.K.); (W.F.)
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510080, China
| | - Hongwen He
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510080, China
- Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510080, China
- Correspondence: (H.H.); (F.H.); Tel.: +86-20-8733-0570 (H.H. & F.H.)
| | - Fang Huang
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China; (H.M.); (J.K.); (W.F.)
- Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510080, China
- Correspondence: (H.H.); (F.H.); Tel.: +86-20-8733-0570 (H.H. & F.H.)
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The nuclear retinoid-related orphan receptor RORα controls adipose tissue inflammation in patients with morbid obesity and diabetes. Int J Obes (Lond) 2021; 45:1369-1381. [PMID: 33637954 DOI: 10.1038/s41366-021-00787-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 02/01/2021] [Accepted: 02/05/2021] [Indexed: 12/30/2022]
Abstract
BACKGROUND/AIMS Inflammation governs adipose tissue (AT) dysfunction in obesity. Retinoic acid receptor-related orphan receptor alpha (RORα) is associated with inflammation and insulin resistance in animal studies, but its role in human obesity remains elusive. We investigated the expression and function of RORα on AT inflammation in patients with morbid obesity with/without diabetes. SUBJECTS/METHODS We assessed RORα expression in paired biopsies of subcutaneous and omental AT from 41 patients (body mass index (BMI) 43.3 ± 0.8 kg/m2) during Roux-en-Y-gastric surgery and explored the functional consequences of pharmacological RORα blockade in AT ex vivo. RESULTS RORα expression was significantly higher in omental AT than in subcutaneous AT (p = 0.03) and was positively associated with BMI (r = 0.344, p = 0.027) and homeostasis model assessment of insulin resistance (r = 0.319, p = 0.041). In ex vivo assays, IL-8/CXCL8 and MCP-1/CCL2 chemokine release was significantly higher in omental fat explants from diabetic patients than from non-diabetics and was significantly diminished by RORα blockade (p < 0.05). Inhibition of RORα improved protein kinase B signaling and decreased NF-κB activity in omental AT from patients with diabetes (p < 0.05). Under dynamic flow conditions, RORα blockade prevented mononuclear cell attachment to human dysfunctional endothelial cells. CONCLUSIONS RORα blockade represents a potential therapy to prevent AT dysfunction and inflammation associated with insulin resistance in human obesity.
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