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Yang G, Yang B, Wang S, Liang X, Li C, Zhang Y, Zhang X, Chang X, Meng X. Cloning grass carp (Ctenopharyngodon idella) ccdc3 and its expression affected by nutrition state, insulin, and glucagon. JOURNAL OF FISH BIOLOGY 2024; 104:624-632. [PMID: 37943095 DOI: 10.1111/jfb.15614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/28/2023] [Accepted: 11/08/2023] [Indexed: 11/10/2023]
Abstract
As an adipokine, coiled-coil domain-containing 3 (CCDC3) plays multiple physiological roles in fatty liver, lipid metabolism, and abdominal obesity. Grass carp was selected as the experimental animal in this study to investigate the roles of Ccdc3 in teleosts. Results showed that the open reading frame (ORF) of cloned ccdc3 was 831 bp and encoded 276 amino acids. Three N-glycosylation sites and a predicted coiled-coil domain motif were located in the identified Ccdc3. Moreover, a nuclear localization signal (NLS) was contained in the coiled-coil domain motif of the identified Ccdc3. The results on tissue distribution revealed that ccdc3 was highly detected in grass carp fat and brain tissue. In the oral glucose tolerance test (OGTT), the expression of ccdc3 increased remarkably in the brain, hypothalamus, and visceral fat in the glucose treatment group. In the fasting and refeeding experiment, the ccdc3 expression levels were remarkably reduced in the brain, hypothalamus, and visceral fat after 14 days of fasting. In the refeeding group, the ccdc3 expression levels were considerably elevated compared with those in the fasting group. In the induced overfeeding experiment, the ccdc3 expression increased remarkably in the hepatopancreas, brain, and visceral fat tissues. The ccdc3 expression in the primary hepatocytes was remarkably increased with glucose, oleic acid, and insulin treatment. However, ccdc3 expression was markedly decreased with glucagon treatment. In conclusion, these results indicate that Ccdc3 is involved in regulating glucose and lipid metabolism of teleosts.
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Affiliation(s)
- Guokun Yang
- College of Fisheries, Henan Normal University, Xinxiang, PR China
- Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, PR China
| | - Boya Yang
- College of Fisheries, Henan Normal University, Xinxiang, PR China
| | - Sunan Wang
- College of Fisheries, Henan Normal University, Xinxiang, PR China
| | - Xiaomin Liang
- College of Fisheries, Henan Normal University, Xinxiang, PR China
| | - Chengquan Li
- College of Fisheries, Henan Normal University, Xinxiang, PR China
| | - Yanmin Zhang
- College of Fisheries, Henan Normal University, Xinxiang, PR China
- Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, PR China
| | - Xindang Zhang
- College of Fisheries, Henan Normal University, Xinxiang, PR China
- Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, PR China
| | - Xulu Chang
- College of Fisheries, Henan Normal University, Xinxiang, PR China
- Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, PR China
| | - Xiaolin Meng
- College of Fisheries, Henan Normal University, Xinxiang, PR China
- Engineering Technology Research Center of Henan Province for Aquatic Animal Cultivation, Henan Normal University, Xinxiang, PR China
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Omari S, Lee H, Wang J, Zeng SX, Lu H. Extracellular and intracellular functions of coiled-coil domain containing 3. J Mol Cell Biol 2023; 15:mjad037. [PMID: 37263799 PMCID: PMC10849165 DOI: 10.1093/jmcb/mjad037] [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: 04/03/2023] [Revised: 05/25/2023] [Accepted: 05/31/2023] [Indexed: 06/03/2023] Open
Abstract
Coiled-coil domain containing 3 (CCDC3, also called Favine) is a highly conserved protein initially identified as a protein secreted from adipocytes and endothelial cells in the vascular system with endocrine-like functions. Recently, CCDC3 was also found to function as a nuclear tumor suppressor in breast cancers. Although it is still understudied, CCDC3, since its discovery, has been shown to play multiple roles in lipid metabolism, fatty liver, abdominal obesity, anti-inflammation, atherosclerosis, and cancer. This essay is thus composed to offer an overview of these extracellular endocrine-like and intracellular (nuclear) functions of CCDC3. We also discuss the possible underlying cellular and molecular mechanisms of CCDC3, the implications for clinical translation, and the remaining puzzles about this special molecule.
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Affiliation(s)
- Sara Omari
- Department of Biochemistry & Molecular Biology, Tulane University School of Medicine, New Orleans, LA 70112, USA
- Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA 70112, USA
| | - Hyemin Lee
- Department of Biochemistry & Molecular Biology, Tulane University School of Medicine, New Orleans, LA 70112, USA
- Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA 70112, USA
| | - Jieqiong Wang
- Department of Biochemistry & Molecular Biology, Tulane University School of Medicine, New Orleans, LA 70112, USA
- Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA 70112, USA
| | - Shelya X Zeng
- Department of Biochemistry & Molecular Biology, Tulane University School of Medicine, New Orleans, LA 70112, USA
- Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA 70112, USA
| | - Hua Lu
- Department of Biochemistry & Molecular Biology, Tulane University School of Medicine, New Orleans, LA 70112, USA
- Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA 70112, USA
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Mao J, Lu Q, Li P, Shi S, Li J, Li Y, Chen S, Xie X. CCDC3 Gene Regulates the Proliferation of Breast Cancer Cells. Bull Exp Biol Med 2023; 174:653-658. [PMID: 37052857 DOI: 10.1007/s10517-023-05763-9] [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: 03/22/2022] [Indexed: 04/14/2023]
Abstract
We studied the effect of CCDC3 on the viability of human breast cancer cell line MDA-MB-231. The levels of CCDC3 mRNA and the corresponding protein in MDA-MB-231, MCF-7, T-47D, and HCC1937 cell lines were measured by reverse transcription quantitative real-time PCR and Western blotting. Since MDA-MB-231 cells had higher expression of mRNA CCDC3 and CCDC3 protein, we used this cell line for transfection with small interfering RNA by lentivirus. Cell Counting Kit-8 and clone formation assay were used to detect the effects of CCDC3 knockdown on cell viability; flow cytometry was used to detect the effects of CCDC3 knockdown on cell apoptosis and cell cycle. In MDA-MB-231 cell line, the CCDC3 protein level was significantly down-regulated after CCDC3 knockdown in comparison with the control group (p<0.05). The cell viability and the number of clones in the CCDC3 knockdown group were significantly reduced (p<0.05), while the apoptosis rate significantly increased (p<0.05). Thus, after CCDC3 knockdown, cell viability is weakened in MDA-MB-231 cells, and cell apoptosis rate is increased. Therefore, CCDC3 gene is promising as a new candidate target for BC treatment.
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Affiliation(s)
- J Mao
- The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan Province, China
| | - Q Lu
- The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan Province, China
| | - P Li
- The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan Province, China
| | - S Shi
- The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan Province, China
| | - J Li
- The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan Province, China
| | - Y Li
- The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan Province, China
| | - S Chen
- The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan Province, China
| | - X Xie
- The First Hospital of Hunan University of Chinese Medicine, Changsha, Hunan Province, China.
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Priyanka PP, Yenugu S. Coiled-Coil Domain-Containing (CCDC) Proteins: Functional Roles in General and Male Reproductive Physiology. Reprod Sci 2021; 28:2725-2734. [PMID: 33942254 DOI: 10.1007/s43032-021-00595-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Accepted: 04/22/2021] [Indexed: 01/10/2023]
Abstract
The coiled-coil domain-containing (CCDC) proteins have been implicated in a variety of physiological and pathological processes. Their functional roles vary from their interaction with molecular components of signaling pathways to determining the physiological functions at the cellular and organ level. Thus, they govern important functions like gametogenesis, embryonic development, hematopoiesis, angiogenesis, and ciliary development. Further, they are implicated in the pathogenesis of a large number of cancers. Polymorphisms in CCDC genes are associated with the risk of lifetime diseases. Because of their role in many biological processes, they have been extensively studied. This review concisely presents the functional role of CCDC proteins that have been studied in the last decade. Studies on CCDC proteins continue to be an active area of investigation because of their indispensable functions. However, there is ample opportunity to further understand the involvement of CCDC proteins in many more functions. It is anticipated that basing on the available literature, the functional role of CCDC proteins will be explored much further.
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Affiliation(s)
| | - Suresh Yenugu
- Department of Animal Biology, University of Hyderabad, Hyderabad, 500046, India.
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Liao W, Liu H, Zhang Y, Jung JH, Chen J, Su X, Kim YC, Flores ER, Wang SM, Czarny-Ratajczak M, Li W, Zeng SX, Lu H. Ccdc3: A New P63 Target Involved in Regulation Of Liver Lipid Metabolism. Sci Rep 2017; 7:9020. [PMID: 28827783 PMCID: PMC5566403 DOI: 10.1038/s41598-017-09228-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 07/17/2017] [Indexed: 12/18/2022] Open
Abstract
TAp63, a member of the p53 family, has been shown to regulate energy metabolism. Here, we report coiled coil domain-containing 3 (CCDC3) as a new TAp63 target. TAp63, but not ΔNp63, p53 or p73, upregulates CCDC3 expression by directly binding to its enhancer region. The CCDC3 expression is markedly reduced in TAp63-null mouse embryonic fibroblasts and brown adipose tissues and by tumor necrosis factor alpha that reduces p63 transcriptional activity, but induced by metformin, an anti-diabetic drug that activates p63. Also, the expression of CCDC3 is positively correlated with TAp63 levels, but conversely with ΔNp63 levels, during adipocyte differentiation. Interestingly, CCDC3, as a secreted protein, targets liver cancer cells and increases long chain polyunsaturated fatty acids, but decreases ceramide in the cells. CCDC3 alleviates glucose intolerance, insulin resistance and steatosis formation in transgenic CCDC3 mice on high-fat diet (HFD) by reducing the expression of hepatic PPARγ and its target gene CIDEA as well as other genes involved in de novo lipogenesis. Similar results are reproduced by hepatic expression of ectopic CCDC3 in mice on HFD. Altogether, these results demonstrate that CCDC3 modulates liver lipid metabolism by inhibiting liver de novo lipogenesis as a downstream player of the p63 network.
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Affiliation(s)
- Wenjuan Liao
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, 70112, USA
| | - Hongbing Liu
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, 70112, USA.,Department of Pediatrics, Tulane University School of Medicine, New Orleans, LA, 70112, USA
| | - Yiwei Zhang
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, 70112, USA
| | - Ji Hoon Jung
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, 70112, USA
| | - Jiaxiang Chen
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, 70112, USA.,Department of Physiology, Jiangxi Medical College of Nanchang University, Nanchang, Jiangxi, 330006, P.R. China
| | - Xiaohua Su
- Department of Molecular Oncology, Cancer Biology and Evolution Program, H. Lee Moffitt Cancer Center, Tampa, Florida, USA
| | - Yeong C Kim
- Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, 68198, NE, USA
| | - Elsa R Flores
- Department of Molecular Oncology, Cancer Biology and Evolution Program, H. Lee Moffitt Cancer Center, Tampa, Florida, USA
| | - San Ming Wang
- Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, 986805 Nebraska Medical Center, Omaha, 68198, NE, USA.,Faculty of Health Sciences, University of Macau, Macau, China
| | - Malwina Czarny-Ratajczak
- Department of Medicine, Center for Aging, Tulane University School of Medicine, New Orleans, LA, 70112, USA
| | - Wen Li
- Laboratory of General Surgery, The First Affiliated Hospital, Sun Yatsen University, Guangzhou, Guangdong, 510080, P.R. China
| | - Shelya X Zeng
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, 70112, USA.
| | - Hua Lu
- Department of Biochemistry & Molecular Biology and Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, 70112, USA.
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Kusakabe M, Ishikawa A, Ravinet M, Yoshida K, Makino T, Toyoda A, Fujiyama A, Kitano J. Genetic basis for variation in salinity tolerance between stickleback ecotypes. Mol Ecol 2016; 26:304-319. [DOI: 10.1111/mec.13875] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 08/30/2016] [Accepted: 09/07/2016] [Indexed: 12/17/2022]
Affiliation(s)
- Makoto Kusakabe
- Atmosphere and Ocean Research Institute; The University of Tokyo; Kashiwanoha 5-1-5 Kashiwa Chiba 277-8564 Japan
- Department of Biological Science; Faculty of Science; Shizuoka University; 836 Ohya, Suruga-ku Shizuoka 422-8529 Japan
| | - Asano Ishikawa
- Division of Ecological Genetics; National Institute of Genetics; Yata 1111 Mishima Shizuoka 411-8540 Japan
| | - Mark Ravinet
- Division of Ecological Genetics; National Institute of Genetics; Yata 1111 Mishima Shizuoka 411-8540 Japan
- Centre for Ecological and Evolutionary Synthesis; University of Oslo; P.O. Box 1066 Blindern Oslo NO-0316 Oslo Norway
| | - Kohta Yoshida
- Division of Ecological Genetics; National Institute of Genetics; Yata 1111 Mishima Shizuoka 411-8540 Japan
| | - Takashi Makino
- Department of Ecology and Evolutionary Biology; Graduate School of Life Sciences; Tohoku University; Sendai Miyagi 980-8578 Japan
| | - Atsushi Toyoda
- Comparative Genomics Laboratory; National Institute of Genetics; Yata 1111 Mishima Shizuoka 411-8540 Japan
| | - Asao Fujiyama
- Comparative Genomics Laboratory; National Institute of Genetics; Yata 1111 Mishima Shizuoka 411-8540 Japan
| | - Jun Kitano
- Division of Ecological Genetics; National Institute of Genetics; Yata 1111 Mishima Shizuoka 411-8540 Japan
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Kobayashi S, Fukuhara A, Otsuki M, Suganami T, Ogawa Y, Morii E, Shimomura I. Fat/vessel-derived secretory protein (Favine)/CCDC3 is involved in lipid accumulation. J Biol Chem 2015; 290:7443-51. [PMID: 25605713 DOI: 10.1074/jbc.m114.592493] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We previously identified a novel gene encoding Favine/CCDC3 (NCBI protein entry NP_083080), a possible secretory factor, the mRNA of which is highly expressed in adipose tissue and the aorta. The Favine mRNA levels are increased in the course of differentiation of rat primary adipocytes and are more elevated in the adipose tissue of genetically obese and diet-induced obese mice than in lean mice. However, its biological function has not yet been elucidated until now. Here, we tested the hypothesis that Favine is involved in lipid metabolism in adipocytes. We found that overexpression of Favine promoted 3T3-L1 adipocyte differentiation. To further investigate the function of Favine in vivo, we generated Favine knock-out (KO) mice. Favine KO mice exhibited a lean phenotype as they aged. The weights of white adipose tissue and liver were less, and adipocyte size was smaller in Favine KO mice compared with wild-type littermates (WT). Expression levels of lipogenic genes, such as fatty-acid synthase (FAS), acetyl-CoA carboxylase α (ACC1), and diacylglycerol O-acyltransferase-2 (Dgat2), were decreased in adipose tissue of Favine KO mice. In 1-year-old mice, Favine deficiency decreased the number of inflammatory cells in white adipose tissue and diminished hepatic steatosis. In vitro, deficiency of Favine attenuated differentiation of primary adipocytes. Taken together, these data demonstrate that Favine has adipogenic and lipogenic effects on adipocytes.
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Affiliation(s)
| | | | | | | | - Yoshihiro Ogawa
- Molecular Endocrinology and Metabolism, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-545 Yushima, Bunkyo-ku, Tokyo, Japan
| | - Eiichi Morii
- Pathology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka and
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Azad AK, Chakrabarti S, Xu Z, Davidge ST, Fu Y. Coiled-coil domain containing 3 (CCDC3) represses tumor necrosis factor-α/nuclear factor κB-induced endothelial inflammation. Cell Signal 2014; 26:2793-800. [PMID: 25193116 DOI: 10.1016/j.cellsig.2014.08.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Accepted: 08/25/2014] [Indexed: 11/26/2022]
Abstract
Coiled-coil domain containing 3 (CCDC3) is a newly identified secretory protein that is expressed in vascular endothelial cells (ECs) and adipose tissues. Here, we investigate the role of CCDC3 in tumor necrosis factor (TNF)-α-induced inflammatory response in ECs. Our results show that stable overexpression of CCDC3 decreases, while stable knockdown of the endogenous CCDC3 increases TNF-α-induced expression of vascular cell adhesion molecule-1 (VCAM-1) at the mRNA and protein level in ECs. The IκB kinase inhibitor Bay 11-7082 completely blocks TNF-α-induced expression of VCAM-1, confirming that TNF-α-induced expression of VCAM-1 in ECs is nuclear factor κB (NF-κB) dependent. Stable overexpression of CCDC3 decreases TNF-α-induced p65 and p50 nuclear translocation and NF-κB transcriptional activity, suggesting that CCDC3 inhibits TNF-α-induced NF-κB activation in ECs. Similar to CCDC3 overexpression, both CCDC3-containing conditioned medium (CM) and purified CCDC3 decrease TNF-α-induced expression of VCAM-1 in receiving ECs, suggesting a paracrine/autocrine function of CCDC3. Interestingly, CCDC3 in CM can enter the receiving ECs. Taken together, our work demonstrates that CCDC3 represses TNF-α/NF-κB-induced pro-inflammatory response in ECs, providing an insight into the functional role of CCDC3.
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Affiliation(s)
- Abul Kalam Azad
- Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
| | - Subhadeep Chakrabarti
- Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
| | - Zhihua Xu
- Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
| | - Sandra T Davidge
- Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
| | - YangXin Fu
- Department of Oncology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada; Department of Obstetrics and Gynecology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada.
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Ugi S, Maeda S, Kawamura Y, Kobayashi MA, Imamura M, Yoshizaki T, Morino K, Sekine O, Yamamoto H, Tani T, Rokushima M, Kashiwagi A, Maegawa H. CCDC3 is specifically upregulated in omental adipose tissue in subjects with abdominal obesity. Obesity (Silver Spring) 2014; 22:1070-7. [PMID: 24123834 DOI: 10.1002/oby.20645] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 09/20/2013] [Indexed: 01/24/2023]
Abstract
OBJECTIVE The aim of this study was to search for novel markers of visceral adiposity. METHODS Visceral (omental) and subcutaneous adipose tissues were obtained from 43 Japanese men. Microarray analysis using total RNA from visceral and subcutaneous adipose tissues obtained from five men with abdominal obesity and five nonobese men was first conducted. Then the expression pattern of candidate genes identified in the human study in mouse models of adiposity was examined. RESULTS Among 30,500 genes evaluated, the mRNA expression of CCDC3 (encoding coiled-coil domain-containing protein 3) was upregulated in omental adipose tissues from abdominally obese subjects (3.07-fold) but not in subcutaneous adipose tissues (0.89-fold). Similar expression patterns were found in two distinct mouse models of obesity. In the analysis of all 43 men, CCDC3 mRNA levels in omental, but not in subcutaneous adipose tissue, were positively correlated with waist circumference and body mass index. CCDC3 was predicted to be a secretory protein, which was confirmed by western blotting, as overexpressed CCDC3 was secreted into the culture media. CONCLUSIONS The expression of CCDC3 is specifically increased in visceral adipose tissues in abdominally obese subjects. These results suggest that CCDC3 is a potential biomarker for estimating visceral adiposity.
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Affiliation(s)
- Satoshi Ugi
- Department of Medicine, Shiga University of Medical Science, Otsu, Japan
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De Jager N, Hudson NJ, Reverter A, Barnard R, Cafe LM, Greenwood PL, Dalrymple BP. Gene expression phenotypes for lipid metabolism and intramuscular fat in skeletal muscle of cattle. J Anim Sci 2013; 91:1112-28. [PMID: 23296809 DOI: 10.2527/jas.2012-5409] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Gene expression phenotypes were evaluated for intramuscular fat (IMF) in bovine skeletal muscle as an alternative to traditional estimates of IMF%. Gene expression data from a time course of LM development in high- and low-marbling Bos taurus cattle crosses were compared to identify genes involved in intramuscular adipocyte lipid metabolism with developmentally similar gene expression profiles. Three sets of genes were identified: triacylglyceride (TAG) synthesis and storage, fatty acid (FA) synthesis, and PPARγ-related genes. In an independent analysis in the LM of 48 Bos indicus cattle, TAG and FA gene sets were enriched in the top 100 genes of which expression was most correlated with IMF% (P = 1.2 × 10(-24) and 3.5 × 10(-9), respectively). In general, genes encoding enzymes involved in the synthesis of FA and TAG in the intramuscular adipocytes were present in the top 100 genes. In B. indicus, effects of a steroid hormone growth promotant (HGP), 2 experimental sites [New South Wales (NSW) and Western Australia (WA)], and 3 tenderness genotypes on the expression levels of genes in the TAG gene set and the correlation of gene expression with IMF% were investigated. Although correlation between expression of 12 individual TAG genes and IMF% was observed in HGP-treated animals in both experimental sites (mean r = 0.43), correlation was not observed for untreated animals at the NSW site (mean r = -0.07, P < 3 × 10(-6)). However, TAG genes showed an average 1.6-fold (P < 0.0004) reduction in expression in the LM of HGP-treated cattle relative to untreated cattle, an effect consistent across both experimental sites. Cattle possessing the favored tenderness calpain 1 and 3 and calpastatin alleles exhibited a greater (P = 0.008) reduction in expression in NSW (1.8-fold reduction, P = 0.0002) compared with WA (1.2-fold reduction, P = 0.03). Tenderness genotype had no impact (P > 0.05) on the correlation of TAG genes with IMF%. In general, the interactions among genotype, treatment and location, and TAG gene set gene expression were consistent with the interactions among the same factors and IMF% detected using 255 animals, of which the 48 in this study were a subset. Thus, the TAG gene set constitutes a gene expression phenotype able to predict effects of different genotypes and treatments on IMF% using much smaller groups than current approaches, even in animals with very low IMF%.
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Affiliation(s)
- N De Jager
- Australian Cooperative Research Centre for Beef Genetic Technologies (Beef CRC), Armidale, NSW 2351, Australia
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