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Welter H, Kreitmair N, Schneider M, Schneider J, Petkov S, Stepanov Y, Köhn FM, Pickl U, Trottmann M, Fröhlich T, Behr R, Mayerhofer A. Dexamethasone is a regulator of clock genes in testicular peritubular cells. Andrology 2024. [PMID: 39506194 DOI: 10.1111/andr.13788] [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: 04/04/2024] [Revised: 09/06/2024] [Accepted: 10/10/2024] [Indexed: 11/08/2024]
Abstract
BACKGROUND We recently found that peritubular cells of the human testis are a dominant site of expression of the glucocorticoid receptor (GR; encoded by NR3C1). Activation of GR by dexamethasone (Dex) strongly influences the phenotype of cultured human testicular peritubular cells (HTPCs), causing massive changes of their proteome and secretome. As glucocorticoids (GC) are also known to set the internal clock of peripheral organs by regulating clock genes, we tested such an influence of Dex in HTPCs. METHODS We performed cellular studies with HTPCs and immortalized nonhuman primate (Callithrix jacchus; Cj)-derived peritubular cells, organotypic incubations of testicular fragments of Cj, qPCR and proteomic, as well as immunohistochemical studies. RESULTS Basal clock gene expression levels, when monitored by qPCR under standard culture conditions, showed alterations over 24 h, suggesting an endogenous circadian rhythm, especially for BMAL1. Dex (1 µM) when added to cells, caused a strong and significant increase of PER1, followed by elevations of BMAL1, and other clock genes. This action was observed as early as 4 h after the addition of Dex. Immunohistochemistry and data mining revealed GR in testicular peritubular cells and other somatic cells of Cj, in situ. We therefore performed organotypic incubations of testicular fragments of Cj (n = 3) and found that upon addition of Dex (1 µM), mRNA levels of BMAL1 and PER1 also increased in samples of two out of three animals after 6 h. Mass spectrometry did, however, not reveal significant alterations of the testicular proteome, possibly due to the short time point and/or the fact that the somatic GR-expressing cells represent only a small portion of the testis. In support for this assumption, Dex (1 µM; 6 h) significantly increased mRNA levels of BMAL1 and PER1 in Cj-derived immortalized testicular peritubular cells. CONCLUSION The results indicate that an internal clock system likely exists in peritubular cells of the testis and that Dex, via testicular GR expressed by peritubular cells and other somatic cells, is a strong regulator of this system. In a physiological situation, GC thus may be important regulators of the testicular clock, while in a situation of prolonged stress or GC-medication, derangements in clock gene expression may result.
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Affiliation(s)
- Harald Welter
- Biomedical Center, Cell Biology, Anatomy III, Faculty of Medicine, Ludwig Maximilian University of Munich, Planegg-Martinsried, Munich, Germany
| | - Nicole Kreitmair
- Biomedical Center, Cell Biology, Anatomy III, Faculty of Medicine, Ludwig Maximilian University of Munich, Planegg-Martinsried, Munich, Germany
| | - Michaela Schneider
- Biomedical Center, Cell Biology, Anatomy III, Faculty of Medicine, Ludwig Maximilian University of Munich, Planegg-Martinsried, Munich, Germany
| | - Julia Schneider
- Biomedical Center, Cell Biology, Anatomy III, Faculty of Medicine, Ludwig Maximilian University of Munich, Planegg-Martinsried, Munich, Germany
| | - Stoyan Petkov
- Platform Degenerative Diseases, German Primate Center, Leibniz Institute for Primate Research, Göttingen, Germany
| | - Youli Stepanov
- Laboratory for Functional Genome Analysis LAFUGA, Gene Center, Ludwig Maximilian University of Munich, München, Germany
| | | | | | | | - Thomas Fröhlich
- Laboratory for Functional Genome Analysis LAFUGA, Gene Center, Ludwig Maximilian University of Munich, München, Germany
| | - Rüdiger Behr
- Platform Degenerative Diseases, German Primate Center, Leibniz Institute for Primate Research, Göttingen, Germany
| | - Artur Mayerhofer
- Biomedical Center, Cell Biology, Anatomy III, Faculty of Medicine, Ludwig Maximilian University of Munich, Planegg-Martinsried, Munich, Germany
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Tsurudome Y, Yoshida Y, Hamamura K, Ogino T, Yasukochi S, Yasuo S, Iwamoto A, Yoshihara T, Inazumi T, Tsuchiya S, Takeo T, Nakagata N, Higuchi S, Sugimoto Y, Tsuruta A, Koyanagi S, Matsunaga N, Ohdo S. Prostaglandin F2α Affects the Cycle of Clock Gene Expression and Mouse Behavior. Int J Mol Sci 2024; 25:1841. [PMID: 38339119 PMCID: PMC10855224 DOI: 10.3390/ijms25031841] [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: 12/20/2023] [Revised: 01/26/2024] [Accepted: 02/01/2024] [Indexed: 02/12/2024] Open
Abstract
Prostaglandins are bioactive compounds, and the activation of their receptors affects the expression of clock genes. However, the prostaglandin F receptor (Ptgfr) has no known relationship with biological rhythms. Here, we first measured the locomotor period lengths of Ptgfr-KO (B6.129-Ptgfrtm1Sna) mice and found that they were longer under constant dark conditions (DD) than those of wild-type (C57BL/6J) mice. We then investigated the clock gene patterns within the suprachiasmatic nucleus in Ptgfr-KO mice under DD and observed a decrease in the expression of the clock gene cryptochrome 1 (Cry1), which is related to the circadian cycle. Moreover, the expression of Cry1, Cry2, and Period2 (Per2) mRNA were significantly altered in the mouse liver in Ptgfr-KO mice under DD. In the wild-type mouse, the plasma prostaglandin F2α (PGF2α) levels showed a circadian rhythm under a 12 h cycle of light-dark conditions. In addition, in vitro experiments showed that the addition of PTGFR agonists altered the amplitude of Per2::luc activity, and this alteration differed with the timing of the agonist addition. These results lead us to hypothesize that the plasma rhythm of PGF2α is important for driving clock genes, thus suggesting the involvement of PGF2α- and Ptgfr-targeting drugs in the biological clock cycle.
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Affiliation(s)
- Yuya Tsurudome
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; (Y.T.); (T.O.); (S.Y.); (S.K.)
| | - Yuya Yoshida
- Department of Clinical Pharmacokinetics, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; (Y.Y.); (K.H.)
| | - Kengo Hamamura
- Department of Clinical Pharmacokinetics, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; (Y.Y.); (K.H.)
| | - Takashi Ogino
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; (Y.T.); (T.O.); (S.Y.); (S.K.)
| | - Sai Yasukochi
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; (Y.T.); (T.O.); (S.Y.); (S.K.)
| | - Shinobu Yasuo
- Regulation in Metabolism and Behavior, Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; (S.Y.)
| | - Ayaka Iwamoto
- Regulation in Metabolism and Behavior, Faculty of Agriculture, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; (S.Y.)
| | - Tatsuya Yoshihara
- SOUSEIKAI Fukuoka Mirai Hospital Clinical Research Center, 3-5-1 Kashiiteriha, Higashi-ku, Fukuoka 813-0017, Japan;
| | - Tomoaki Inazumi
- Department of Pharmaceutical Biochemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1, Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan; (T.I.); (S.T.); (Y.S.)
| | - Soken Tsuchiya
- Department of Pharmaceutical Biochemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1, Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan; (T.I.); (S.T.); (Y.S.)
| | - Toru Takeo
- Division of Reproductive Engineering, Center for Animal Resources and Development (CARD), Institute of Resource Development and Analysis, Kumamoto University, 2-2-1 Honjo, Chuo-ku, Kumamoto 860-0811, Japan;
| | - Naomi Nakagata
- Division of Reproductive Biotechnology and Innovation, Center for Animal Resources and Development (CARD), Institute of Resource Development and Analysis, Kumamoto University, 2-2-1 Honjo, Chuo-ku, Kumamoto 860-0811, Japan;
| | - Shigekazu Higuchi
- Department of Human Life Design and Science, Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, Fukuoka 815-8540, Japan;
| | - Yukihiko Sugimoto
- Department of Pharmaceutical Biochemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1, Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan; (T.I.); (S.T.); (Y.S.)
| | - Akito Tsuruta
- Department of Glocal Healthcare Science, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan;
| | - Satoru Koyanagi
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; (Y.T.); (T.O.); (S.Y.); (S.K.)
- Department of Glocal Healthcare Science, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan;
| | - Naoya Matsunaga
- Department of Clinical Pharmacokinetics, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; (Y.Y.); (K.H.)
| | - Shigehiro Ohdo
- Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan; (Y.T.); (T.O.); (S.Y.); (S.K.)
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Kourpa A, Schulz A, Mangelsen E, Kaiser-Graf D, Koppers N, Stoll M, Rothe M, Bader M, Purfürst B, Kunz S, Gladytz T, Niendorf T, Bachmann S, Mutig K, Bolbrinker J, Panáková D, Kreutz R. Studies in Zebrafish and Rat Models Support Dual Blockade of EP2 and EP4 (Prostaglandin E 2 Receptors Type 2 and 4) for Renoprotection in Glomerular Hyperfiltration and Albuminuria. Hypertension 2023; 80:771-782. [PMID: 36715011 DOI: 10.1161/hypertensionaha.122.20392] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Glomerular hyperfiltration (GH) is an important mechanism in the development of albuminuria in hypertension. Upregulation of COX2 (cyclooxygenase 2) and prostaglandin E2 (PGE2) was linked to podocyte damage in GH. We explored the potential renoprotective effects of either separate or combined pharmacological blockade of EP2 (PGE2 receptor type 2) and EP4 (PGE2 receptor type 4) in GH. METHODS We conducted in vivo studies in a transgenic zebrafish model (Tg[fabp10a:gc-EGFP]) suitable for analysis of glomerular filtration barrier function and a genetic rat model with GH, albuminuria, and upregulation of PGE2. Similar pharmacological interventions and primary outcome analysis on albuminuria phenotype development were conducted in both model systems. RESULTS Stimulation of zebrafish embryos with PGE2 induced an albuminuria-like phenotype, thus mimicking the suggested PGE2 effects on glomerular filtration barrier dysfunction. Both separate and combined blockade of EP2 and EP4 reduced albuminuria phenotypes in zebrafish and rat models. A significant correlation between albuminuria and podocyte damage in electron microscopy imaging was identified in the rat model. Dual blockade of both receptors showed a pronounced synergistic suppression of albuminuria. Importantly, this occurred without changes in arterial blood pressure, glomerular filtration rate, or tissue oxygenation in magnetic resonance imaging, while RNA sequencing analysis implicated a potential role of circadian clock genes. CONCLUSIONS Our findings confirm a role of PGE2 in the development of albuminuria in GH and support the renoprotective potential of combined pharmacological blockade of EP2 and EP4 receptors. These data support further translational research to explore this therapeutic option and a possible role of circadian clock genes.
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Affiliation(s)
- Aikaterini Kourpa
- Institute of Clinical Pharmacology and Toxicology (A.K., A.S., E.M., D.K.-G., J.B., R.K.), Charité-Universitätsmedizin Berlin, Germany.,Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany (A.K., M.B., B.P., S.K., T.G., T.N., D.P.)
| | - Angela Schulz
- Institute of Clinical Pharmacology and Toxicology (A.K., A.S., E.M., D.K.-G., J.B., R.K.), Charité-Universitätsmedizin Berlin, Germany
| | - Eva Mangelsen
- Institute of Clinical Pharmacology and Toxicology (A.K., A.S., E.M., D.K.-G., J.B., R.K.), Charité-Universitätsmedizin Berlin, Germany
| | - Debora Kaiser-Graf
- Institute of Clinical Pharmacology and Toxicology (A.K., A.S., E.M., D.K.-G., J.B., R.K.), Charité-Universitätsmedizin Berlin, Germany
| | - Nils Koppers
- Genetic Epidemiology, Institute for Human Genetics, Westfälische Wilhelms University, Münster, Germany (N.K., M.S.)
| | - Monika Stoll
- Genetic Epidemiology, Institute for Human Genetics, Westfälische Wilhelms University, Münster, Germany (N.K., M.S.)
| | | | - Michael Bader
- Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany (A.K., M.B., B.P., S.K., T.G., T.N., D.P.).,German Center for Cardiovascular Research, Partner Site Berlin, Germany (M.B.).,Charité-Universitätsmedizin Berlin, Germany (M.B.).,Institute for Biology, University of Lübeck, Germany (M.B.)
| | - Bettina Purfürst
- Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany (A.K., M.B., B.P., S.K., T.G., T.N., D.P.)
| | - Severine Kunz
- Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany (A.K., M.B., B.P., S.K., T.G., T.N., D.P.)
| | - Thomas Gladytz
- Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany (A.K., M.B., B.P., S.K., T.G., T.N., D.P.)
| | - Thoralf Niendorf
- Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany (A.K., M.B., B.P., S.K., T.G., T.N., D.P.)
| | - Sebastian Bachmann
- Institute of Vegetative Anatomy (S.B.), Charité-Universitätsmedizin Berlin, Germany
| | - Kerim Mutig
- Institute of Translational Physiology (K.M.), Charité-Universitätsmedizin Berlin, Germany
| | - Juliane Bolbrinker
- Institute of Clinical Pharmacology and Toxicology (A.K., A.S., E.M., D.K.-G., J.B., R.K.), Charité-Universitätsmedizin Berlin, Germany
| | - Daniela Panáková
- Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany (A.K., M.B., B.P., S.K., T.G., T.N., D.P.)
| | - Reinhold Kreutz
- Institute of Clinical Pharmacology and Toxicology (A.K., A.S., E.M., D.K.-G., J.B., R.K.), Charité-Universitätsmedizin Berlin, Germany
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4
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Chihara I, Negoro H, Kono J, Nagumo Y, Tsuchiya H, Kojo K, Shiga M, Tanaka K, Kandori S, Mathis BJ, Nishiyama H. Glucocorticoids coordinate the bladder peripheral clock and diurnal micturition pattern in mice. Commun Biol 2023; 6:81. [PMID: 36681730 PMCID: PMC9867708 DOI: 10.1038/s42003-023-04464-3] [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] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 01/11/2023] [Indexed: 01/22/2023] Open
Abstract
Peripheral clocks function to regulate each organ and are synchronized though various molecular and behavioral signals. However, signals that entrain the bladder clock remain elusive. Here, we show that glucocorticoids are a key cue for the bladder clock in vitro and in vivo. A pBmal1-dLuc human urothelial cell-line showed significant shifts in gene expression after cortisol treatment. In vivo, rhythmic bladder clock gene expression was unchanged by bilateral adrenalectomy but shifted 4 h forward by corticosterone administration at the inactive phase. Moreover, the bladder clock shifted 8-12 h in mice that underwent both bilateral adrenalectomy and corticosterone administration at the inactive phase. These mice showed decreases in the diurnal rhythm of volume voided per micturition, while maintaining diurnal activity rhythms. These results indicate that the diurnal rhythm of glucocorticoid signaling is a zeitgeber that overcomes other bladder clock entrainment factors and coordinates the diurnal rhythm of volume voided per micturition.
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Affiliation(s)
- Ichiro Chihara
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Hiromitsu Negoro
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan.
| | - Jin Kono
- Department of Urology, Graduate School of Medicine, Kyoto University, Sakyo, Kyoto, Japan
| | - Yoshiyuki Nagumo
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Haruki Tsuchiya
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Kosuke Kojo
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Masanobu Shiga
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Ken Tanaka
- Department of Urology, Tsukuba Medical Center Hospital, Tsukuba, Ibaraki, Japan
| | - Shuya Kandori
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
| | - Bryan J Mathis
- International Medical Center, University of Tsukuba Affiliated Hospital, Tsukuba, Ibaraki, Japan
| | - Hiroyuki Nishiyama
- Department of Urology, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, Japan
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5
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Clock-Modulating Activities of the Anti-Arrhythmic Drug Moricizine. Clocks Sleep 2021; 3:351-365. [PMID: 34206497 PMCID: PMC8293187 DOI: 10.3390/clockssleep3030022] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/09/2021] [Accepted: 06/21/2021] [Indexed: 12/12/2022] Open
Abstract
Dysregulated circadian functions contribute to various diseases, including cardiovascular disease. Much progress has been made on chronotherapeutic applications of drugs against cardiovascular disease (CVD); however, the direct effects of various medications on the circadian system are not well characterized. We previously conducted high-throughput chemical screening for clock modulators and identified an off-patent anti-arrhythmic drug, moricizine, as a clock-period lengthening compound. In Per2:LucSV reporter fibroblast cells, we showed that under both dexamethasone and forskolin synchronization, moricizine was able to increase the circadian period length, with greater effects seen with the former. Titration studies revealed a dose-dependent effect of moricizine to lengthen the period. In contrast, flecainide, another Class I anti-arrhythmic, showed no effects on circadian reporter rhythms. Real-time qPCR analysis in fibroblast cells treated with moricizine revealed significant circadian time- and/or treatment-dependent expression changes in core clock genes, consistent with the above period-lengthening effects. Several clock-controlled cardiac channel genes also displayed altered expression patterns. Using tissue explant culture, we showed that moricizine was able to significantly prolong the period length of circadian reporter rhythms in atrial ex vivo cultures. Using wild-type C57BL/6J mice, moricizine treatment was found to promote sleep, alter circadian gene expression in the heart, and show a slight trend of increasing free-running periods. Together, these observations demonstrate novel clock-modulating activities of moricizine, particularly the period-lengthening effects on cellular oscillators, which may have clinical relevance against heart diseases.
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6
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Zakhvataev VE. Tidal variations of background ionizing radiation and circadian timing of the suprachiasmatic nucleus clock. Med Hypotheses 2020; 140:109667. [PMID: 32182557 DOI: 10.1016/j.mehy.2020.109667] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Revised: 03/03/2020] [Accepted: 03/05/2020] [Indexed: 02/06/2023]
Abstract
Recently, correlations of different physiological processes in humans with variations in the local lunisolar gravitational tide force have been observed under highly controlled laboratory conditions. Understanding of the physical nature of this phenomenon needs a comprehensive study of its possible molecular mechanisms. One of the possible timing cues is the strong periodic variation of the emanation fields of radon-222 and its progeny produced by tidal deformations of geological environment. In the present work, we argue that this variation could induce temporal modulation of radiation-induced bystander signaling pathways associated with fundamental regulators of gene expression in the suprachiasmatic nucleus clock.
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Affiliation(s)
- V E Zakhvataev
- Federal Research Center "Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences", 660036 Krasnoyarsk, Russia; Siberian Federal University, 660041 Krasnoyarsk, Russia.
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Mosser EA, Chiu CN, Tamai TK, Hirota T, Li S, Hui M, Wang A, Singh C, Giovanni A, Kay SA, Prober DA. Identification of pathways that regulate circadian rhythms using a larval zebrafish small molecule screen. Sci Rep 2019; 9:12405. [PMID: 31455847 PMCID: PMC6712016 DOI: 10.1038/s41598-019-48914-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 07/31/2019] [Indexed: 12/12/2022] Open
Abstract
The circadian clock ensures that behavioral and physiological processes occur at appropriate times during the 24-hour day/night cycle, and is regulated at both the cellular and organismal levels. To identify pathways acting on intact animals, we performed a small molecule screen using a luminescent reporter of molecular circadian rhythms in zebrafish larvae. We identified both known and novel pathways that affect circadian period, amplitude and phase. Several drugs identified in the screen did not affect circadian rhythms in cultured cells derived from luminescent reporter embryos or in established zebrafish and mammalian cell lines, suggesting they act via mechanisms absent in cell culture. Strikingly, using drugs that promote or inhibit inflammation, as well as a mutant that lacks microglia, we found that inflammatory state affects circadian amplitude. These results demonstrate a benefit of performing drug screens using intact animals and provide novel targets for treating circadian rhythm disorders.
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Affiliation(s)
- Eric A Mosser
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA.,Program in Biological Sciences, Northwestern University, Evanston, IL, 60201, USA
| | - Cindy N Chiu
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA.,Department of Neurobiology, Northwestern University, Evanston, IL, 60201, USA
| | - T Katherine Tamai
- Centre for Cell and Molecular Dynamics, Department of Cell and Developmental Biology, University College London, London, WC1E 6BT, United Kingdom
| | - Tsuyoshi Hirota
- PRESTO, JST, Nagoya, 464-8601, Japan.,Institute of Transformative Bio-Molecules, Nagoya University, Nagoya, 464-8601, Japan
| | - Suna Li
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - May Hui
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Amy Wang
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | - Chanpreet Singh
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA
| | | | - Steve A Kay
- Department of Neurology, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90089, USA
| | - David A Prober
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA.
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8
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Xie Y, Tang Q, Chen G, Xie M, Yu S, Zhao J, Chen L. New Insights Into the Circadian Rhythm and Its Related Diseases. Front Physiol 2019; 10:682. [PMID: 31293431 PMCID: PMC6603140 DOI: 10.3389/fphys.2019.00682] [Citation(s) in RCA: 152] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 05/13/2019] [Indexed: 12/18/2022] Open
Abstract
Circadian rhythms (CR) are a series of endogenous autonomous oscillators generated by the molecular circadian clock which acting on coordinating internal time with the external environment in a 24-h daily cycle. The circadian clock system is a major regulatory factor for nearly all physiological activities and its disorder has severe consequences on human health. CR disruption is a common issue in modern society, and researches about people with jet lag or shift works have revealed that CR disruption can cause cognitive impairment, psychiatric illness, metabolic syndrome, dysplasia, and cancer. In this review, we summarized the synchronizers and the synchronization methods used in experimental research, and introduced CR monitoring and detection methods. Moreover, we evaluated conventional CR databases, and analyzed experiments that characterized the underlying causes of CR disorder. Finally, we further discussed the latest developments in understanding of CR disruption, and how it may be relevant to health and disease. Briefly, this review aimed to synthesize previous studies to aid in future studies of CR and CR-related diseases.
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Affiliation(s)
- Yanling Xie
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qingming Tang
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Guangjin Chen
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Mengru Xie
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Shaoling Yu
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jiajia Zhao
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Lili Chen
- Department of Stomatology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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9
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Bentivoglio M, Kristensson K, Rottenberg ME. Circumventricular Organs and Parasite Neurotropism: Neglected Gates to the Brain? Front Immunol 2018; 9:2877. [PMID: 30619260 PMCID: PMC6302769 DOI: 10.3389/fimmu.2018.02877] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Accepted: 11/22/2018] [Indexed: 12/20/2022] Open
Abstract
Circumventricular organs (CVOs), neural structures located around the third and fourth ventricles, harbor, similarly to the choroid plexus, vessels devoid of a blood-brain barrier (BBB). This enables them to sense immune-stimulatory molecules in the blood circulation, but may also increase chances of exposure to microbes. In spite of this, attacks to CVOs by microbes are rarely described. It is here highlighted that CVOs and choroid plexus can be infected by pathogens circulating in the bloodstream, providing a route for brain penetration, as shown by infections with the parasites Trypanosoma brucei. Immune responses elicited by pathogens or systemic infections in the choroid plexus and CVOs are briefly outlined. From the choroid plexus trypanosomes can seed into the ventricles and initiate accelerated infiltration of T cells and parasites in periventricular areas. The highly motile trypanosomes may also enter the brain parenchyma from the median eminence, a CVO located at the base of the third ventricle, by crossing the border into the BBB-protected hypothalamic arcuate nuclei. A gate may, thus, be provided for trypanosomes to move into brain areas connected to networks of regulation of circadian rhythms and sleep-wakefulness, to which other CVOs are also connected. Functional imbalances in these networks characterize human African trypanosomiasis, also called sleeping sickness. They are distinct from the sickness response to bacterial infections, but can occur in common neuropsychiatric diseases. Altogether the findings lead to the question: does the neglect in reporting microbe attacks to CVOs reflect lack of awareness in investigations or of gate-opening capability by microbes?
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Affiliation(s)
- Marina Bentivoglio
- Department of Neuroscience Biomedicine and Movement Sciences, University of Verona, Verona, Italy
| | | | - Martin E. Rottenberg
- Department Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
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Masocha W, Kristensson K. Human African trypanosomiasis: How do the parasites enter and cause dysfunctions of the nervous system in murine models? Brain Res Bull 2018; 145:18-29. [PMID: 29870779 DOI: 10.1016/j.brainresbull.2018.05.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 05/24/2018] [Accepted: 05/30/2018] [Indexed: 12/27/2022]
Abstract
In this review we describe how Trypanosoma brucei brucei, a rodent pathogenic strain of African trypanosomes, can invade the nervous system, first by localization to the choroid plexus, the circumventricular organs (CVOs) and peripheral ganglia, which have fenestrated vessels, followed by crossing of the blood-brain barrier (BBB) into the white matter, hypothalamus, thalamus and basal ganglia. White blood cells (WBCs) pave the way for the trypanosome neuroinvasion. Experiments with immune deficient mice show that the invasion of WBCs is initiated by the toll-like receptor 9, followed by an augmentation phase that depends on the cytokine IFN-γ and the chemokine CXCL10. Nitric oxide (NO) derived from iNOS then prevents a break-down of the BBB and non-regulated passage of cells. This chain of events is relevant for design of better diagnostic tools to distinguish the different stages of the disease as well as for better understanding of the pathogenesis of the nervous system dysfunctions, which include circadian rhythm changes with sleep pattern disruption, pain syndromes, movement disorders and mental disturbances including dementia.
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Affiliation(s)
- Willias Masocha
- Department of Pharmacology and Therapeutics, Faculty of Pharmacy, Kuwait University, Kuwait.
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11
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Barca-Mayo O, Pons-Espinal M, Follert P, Armirotti A, Berdondini L, De Pietri Tonelli D. Astrocyte deletion of Bmal1 alters daily locomotor activity and cognitive functions via GABA signalling. Nat Commun 2017; 8:14336. [PMID: 28186121 PMCID: PMC5309809 DOI: 10.1038/ncomms14336] [Citation(s) in RCA: 164] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2016] [Accepted: 12/19/2016] [Indexed: 02/08/2023] Open
Abstract
Circadian rhythms are controlled by a network of clock neurons in the central pacemaker, the suprachiasmatic nucleus (SCN). Core clock genes, such as Bmal1, are expressed in SCN neurons and in other brain cells, such as astrocytes. However, the role of astrocytic clock genes in controlling rhythmic behaviour is unknown. Here we show that ablation of Bmal1 in GLAST-positive astrocytes alters circadian locomotor behaviour and cognition in mice. Specifically, deletion of astrocytic Bmal1 has an impact on the neuronal clock through GABA signalling. Importantly, pharmacological modulation of GABAA-receptor signalling completely rescues the behavioural phenotypes. Our results reveal a crucial role of astrocytic Bmal1 for the coordination of neuronal clocks and propose a new cellular target, astrocytes, for neuropharmacology of transient or chronic perturbation of circadian rhythms, where alteration of astrocytic clock genes might contribute to the impairment of the neurobehavioural outputs such as cognition.
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Affiliation(s)
- Olga Barca-Mayo
- Neurobiology of miRNA Lab, Neuroscience and Brain Technologies Department, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy
- NetS3 Lab, Neuroscience and Brain Technologies Department, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy
| | - Meritxell Pons-Espinal
- Neurobiology of miRNA Lab, Neuroscience and Brain Technologies Department, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy
| | - Philipp Follert
- Neurobiology of miRNA Lab, Neuroscience and Brain Technologies Department, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy
| | - Andrea Armirotti
- D3 PharmaChemistry, Department of Drug Discovery and Development, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy
| | - Luca Berdondini
- NetS3 Lab, Neuroscience and Brain Technologies Department, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy
| | - Davide De Pietri Tonelli
- Neurobiology of miRNA Lab, Neuroscience and Brain Technologies Department, Fondazione Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy
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12
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Stress-induced bystander signaling as a possible factor contributing to neuronal excitability and seizure generation/epileptogenesis. Med Hypotheses 2016; 90:57-62. [DOI: 10.1016/j.mehy.2016.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Accepted: 03/10/2016] [Indexed: 01/23/2023]
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13
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Zakhvataev VE. Possible scenarios of the influence of low-dose ionizing radiation on neural functioning. Med Hypotheses 2015; 85:723-35. [PMID: 26526727 DOI: 10.1016/j.mehy.2015.10.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 10/05/2015] [Accepted: 10/20/2015] [Indexed: 12/30/2022]
Abstract
Possible scenarios of the influence of ionizing radiation on neural functioning and the CNS are suggested. We argue that the radiation-induced bystander mechanisms associated with Ca(2+) flows, reactive nitrogen and oxygen species, and cytokines might lead to modulation of certain neuronal signaling pathways. The considered scenarios of conjugation of the bystander signaling and the neuronal signaling might result in modulation of certain synaptic receptors, neurogenesis, neurotransmission, channel conductance, synaptic signaling, different forms of neural plasticity, memory formation and storage, and learning. On this basis, corresponding new possible strategies for treating neurodegenerative deceases and mental disorders are proposed. The mechanisms considered might also be associated with neuronal survival and relevant to the treatment for brain injuries. At the same time, these mechanisms might be associated with detrimental effects and might facilitate the development of some neurological and psychiatric disorders.
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Affiliation(s)
- Vladimir E Zakhvataev
- Neuroinformatics Department, Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands; Laboratory of Biological Action of Low-Intensity Factors, Siberian Federal University, 79 Svobodny pr., 660041 Krasnoyarsk, Russia.
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14
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Poletini MO, Ramos BC, Moraes MN, Castrucci AML. Nonvisual Opsins and the Regulation of Peripheral Clocks by Light and Hormones. Photochem Photobiol 2015; 91:1046-55. [DOI: 10.1111/php.12494] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 06/23/2015] [Indexed: 12/18/2022]
Affiliation(s)
- Maristela O. Poletini
- Department of Physiology and Biophysics; Institute of Biological Sciences; Federal University of Minas Gerais; Belo Horizonte Brazil
- Department of Physiology; Institute of Biosciences; University of São Paulo; São Paulo Brazil
| | - Bruno C. Ramos
- Department of Physiology; Institute of Biosciences; University of São Paulo; São Paulo Brazil
| | - Maria Nathalia Moraes
- Department of Physiology; Institute of Biosciences; University of São Paulo; São Paulo Brazil
| | - Ana Maria L. Castrucci
- Department of Physiology; Institute of Biosciences; University of São Paulo; São Paulo Brazil
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15
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Abstract
Rhythmic events in the female reproductive system depend on the coordinated and synchronized activity of multiple neuroendocrine and endocrine tissues. This coordination is facilitated by the timing of gene expression and cellular physiology at each level of the hypothalamo-pituitary-ovarian (HPO) axis, including the basal hypothalamus and forebrain, the pituitary gland, and the ovary. Central to this pathway is the primary circadian pacemaker in the suprachiasmatic nucleus (SCN) that, through its myriad outputs, provides a temporal framework for gonadotropin release and ovulation. The heart of the timing system, a transcription-based oscillator, imparts SCN pacemaker cells and a company of peripheral tissues with the capacity for daily oscillations of gene expression and cellular physiology. Although the SCN sits comfortably at the helm, peripheral oscillators (such as the ovary) have undefined but potentially critical roles. Each cell type of the ovary, including theca cells, granulosa cells, and oocytes, harbor a molecular clock implicated in the processes of follicular growth, steroid hormone synthesis, and ovulation. The ovarian clock is influenced by the reproductive cycle and diseases that perturb the cycle and/or follicular growth can disrupt the timing of clock gene expression in the ovary. Chronodisruption is known to negatively affect reproductive function and fertility in both rodent models and women exposed to shiftwork schedules. Thus, influencing clock function in the HPO axis with chronobiotics may represent a novel avenue for the treatment of common fertility disorders, particularly those resulting from chronic circadian disruption.
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Affiliation(s)
- Michael T. Sellix
- Department of Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA
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16
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Virag JAI, Lust RM. Circadian influences on myocardial infarction. Front Physiol 2014; 5:422. [PMID: 25400588 PMCID: PMC4214187 DOI: 10.3389/fphys.2014.00422] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Accepted: 10/12/2014] [Indexed: 11/13/2022] Open
Abstract
Components of circadian rhythm maintenance, or "clock genes," are endogenous entrainable oscillations of about 24 h that regulate biological processes and are found in the suprachaismatic nucleus (SCN) and many peripheral tissues, including the heart. They are influenced by external cues, or Zeitgebers, such as light and heat, and can influence such diverse phenomena as cytokine expression immune cells, metabolic activity of cardiac myocytes, and vasodilator regulation by vascular endothelial cells. While it is known that the central master clock in the SCN synchronizes peripheral physiologic rhythms, the mechanisms by which the information is transmitted are complex and may include hormonal, metabolic, and neuronal inputs. Whether circadian patterns are causally related to the observed periodicity of events, or whether they are simply epi-phenomena is not well established, but a few studies suggest that the circadian effects likely are real in their impact on myocardial infarct incidence. Cycle disturbances may be harbingers of predisposition and subsequent response to acute and chronic cardiac injury, and identifying the complex interactions of circadian rhythms and myocardial infarction may provide insights into possible preventative and therapeutic strategies for susceptible populations.
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Affiliation(s)
- Jitka A I Virag
- Department of Physiology, Brody School of Medicine, East Carolina University Greenville, NC, USA
| | - Robert M Lust
- Department of Physiology, Brody School of Medicine, East Carolina University Greenville, NC, USA
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17
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Circadian Clocks and Inflammation: Reciprocal Regulation and Shared Mediators. Arch Immunol Ther Exp (Warsz) 2014; 62:303-18. [DOI: 10.1007/s00005-014-0286-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Accepted: 01/22/2014] [Indexed: 02/06/2023]
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18
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Pharmacological modulators of the circadian clock as potential therapeutic drugs: focus on genotoxic/anticancer therapy. Handb Exp Pharmacol 2013:289-309. [PMID: 23604484 DOI: 10.1007/978-3-642-25950-0_12] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The circadian clock is an evolutionary conserved intrinsic timekeeping mechanism that controls daily variations in multiple biological processes. One important process that is modulated by the circadian clock is an organism's response to genotoxic stress, such as that induced by anticancer drug and radiation treatments. Numerous observations made in animal models have convincingly demonstrated that drug-induced toxicity displays prominent daily variations; therefore, undesirable side effects could be significantly reduced by administration of drugs at specific times when they are better tolerated. In some cases, these critical times of the day coincide with increased sensitivity of tumor cells allowing for a greater therapeutic index. Despite encouraging results of chronomodulated therapies, our knowledge of molecular mechanisms underlying these observations remains sketchy. Here we review recent progress in deciphering mechanistic links between circadian and stress response pathways with a focus on how these findings could be applied to anticancer clinical practice. We discuss the potential for using high-throughput screens to identify small molecules that can modulate basic parameters of the entire circadian machinery as well as functional activity of its individual components. We also describe the discovery of several small molecules that can pharmacologically modulate clock and that have a potential to be developed into therapeutic drugs. We believe that translational applications of clock-targeting pharmaceuticals are twofold: they may be developed into drugs to treat circadian-related disorders or used in combination with existing therapeutic strategies to improve therapeutic index of a given genotoxic treatment via the intrinsic clock mechanism.
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19
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Herichová I, Šoltésová D, Szántóová K, Mravec B, Neupauerová D, Veselá A, Zeman M. Effect of angiotensin II on rhythmic per2 expression in the suprachiasmatic nucleus and heart and daily rhythm of activity in Wistar rats. ACTA ACUST UNITED AC 2013; 186:49-56. [PMID: 23850797 DOI: 10.1016/j.regpep.2013.06.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 04/29/2013] [Accepted: 06/27/2013] [Indexed: 11/26/2022]
Abstract
Endogenous daily rhythms are generated by the hierarchically organized circadian system predominantly synchronized by the external light (L): dark (D) cycle. During recent years several humoral signals have been found to influence the generation and manifestation of daily rhythm. Since most studies have been performed under in vitro conditions, the mechanisms employed under in vivo conditions need to be investigated. Our study focused on angiotensin II (angII)-mediated regulation of Per2 expression in the suprachiasmatic nuclei (SCN) and heart and spontaneous locomotor activity in Wistar rats under synchronized conditions. Angiotensin II was infused (100ng/kg/min) via subcutaneously implanted osmotic minipumps for 7 or 28days. Samples were taken in 4-h intervals during a 24hcycle and after a light pulse applied in the first and second part of the dark phase. Gene expression was measured using real time PCR. Locomotor activity was monitored using an infrared camera with a remote control installed in the animal facility. Seven days of angII infusion caused an increase in blood pressure and heart/body weight index and 28days of angII infusion also increased water intake in comparison with controls. We observed a distinct daily rhythm in Per2 expression in the SCN and heart of control rats and infused rats. Seven days of angII infusion did not influence Per2 expression in the heart. 28days of angII treatment caused significant phase advance and a decrease in nighttime expression of Per2 and influenced expression of clock controlled genes Rev-erb alpha and Dbp in the heart compared to the control. Four weeks of angII infusion decreased the responsiveness of Per2 expression in the SCN to a light pulse at the end of the dark phase of the 24hcycle. Expression of mRNA coding angiotensin-converting enzyme (ACE) and angiotensin-converting enzyme 2 (ACE2) showed a daily rhythm in the heart of control rats. Four weeks of angII infusion caused a decrease in amplitude of rhythmic expression of Ace, the disappearance of rhythm and an increase in Ace2 expression. The Ace/Ace2 ratio showed a rhythmic pattern in the heart of control rats with peak levels during the dark phase. Angiotensin II infusion decreased the mean Ace/Ace2 mRNA ratio in the heart. We observed a significant daily rhythm in expression of brain natriuretic peptide (BNP) in the heart of control rats. In hypertensive rats mean value of Bnp expression increased. Locomotor activity showed a distinct daily rhythm in both groups. Angiotensin II time dependently decreased ratio of locomotor activity in active versus passive phase of 24hcycle. To conclude, 28days of subcutaneous infusion of angII modulates the functioning of the central and peripheral circadian system measured at the level of Per2 expression and locomotor activity.
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Affiliation(s)
- Iveta Herichová
- Department of Animal Physiology and Ethology, Faculty of Natural Sciences, Comenius University, Mlynská dolina B-2, 842 15 Bratislava, Slovak Republic.
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20
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Cermakian N, Lange T, Golombek D, Sarkar D, Nakao A, Shibata S, Mazzoccoli G. Crosstalk between the circadian clock circuitry and the immune system. Chronobiol Int 2013; 30:870-88. [PMID: 23697902 DOI: 10.3109/07420528.2013.782315] [Citation(s) in RCA: 196] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Various features, components, and functions of the immune system present daily variations. Immunocompetent cell counts and cytokine levels present variations according to the time of day and the sleep-wake cycle. Moreover, different immune cell types, such as macrophages, natural killer cells, and lymphocytes, contain a circadian molecular clockwork. The biological clocks intrinsic to immune cells and lymphoid organs, together with inputs from the central pacemaker of the suprachiasmatic nuclei via humoral and neural pathways, regulate the function of cells of the immune system, including their response to signals and their effector functions. Consequences of this include, for example, the daily variation in the response to an immune challenge (e.g., bacterial endotoxin injection) and the circadian control of allergic reactions. The circadian-immune connection is bidirectional, because in addition to this circadian control of immune functions, immune challenges and immune mediators (e.g., cytokines) were shown to have strong effects on circadian rhythms at the molecular, cellular, and behavioral levels. This tight crosstalk between the circadian and immune systems has wide-ranging implications for disease, as shown by the higher incidence of cancer and the exacerbation of autoimmune symptoms upon circadian disruption.
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Affiliation(s)
- Nicolas Cermakian
- Laboratory of Molecular Chronobiology, Douglas Mental Health University Institute, Department of Psychiatry, McGill University, Montreal, Quebec, Canada
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21
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Abstract
Although circadian rhythms in mammalian physiology and behavior are dependent upon a biological clock in the suprachiasmatic nuclei (SCN) of the hypothalamus, the molecular mechanism of this clock is in fact cell autonomous and conserved in nearly all cells of the body. Thus, the SCN serves in part as a "master clock," synchronizing "slave" clocks in peripheral tissues, and in part directly orchestrates circadian physiology. In this chapter, we first consider the detailed mechanism of peripheral clocks as compared to clocks in the SCN and how mechanistic differences facilitate their functions. Next, we discuss the different mechanisms by which peripheral tissues can be entrained to the SCN and to the environment. Finally, we look directly at how peripheral oscillators control circadian physiology in cells and tissues.
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Affiliation(s)
- Steven A Brown
- Institute of Pharmacology and Toxicology, 190 Winterthurerstrasse, 8057 Zürich, Switzerland.
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Sellix MT. Clocks underneath: the role of peripheral clocks in the timing of female reproductive physiology. Front Endocrinol (Lausanne) 2013; 4:91. [PMID: 23888155 PMCID: PMC3719037 DOI: 10.3389/fendo.2013.00091] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 07/08/2013] [Indexed: 11/13/2022] Open
Abstract
The central circadian pacemaker in the suprachiasmatic nucleus (SCN) is a critical component of the neuroendocrine circuit controlling gonadotropin secretion from the pituitary gland. The SCN conveys photic information to hypothalamic targets including the gonadotropin releasing hormone neurons. Many of these target cells are also cell autonomous clocks. It has been suggested that, rather then being singularly driven by the SCN, the timing of gonadotropin secretion depends on the activity of multiple hypothalamic oscillators. While this view provides a novel twist to an old story, it does little to diminish the central role of rhythmic hypothalamic output in this system. It is now clear that the pituitary, ovary, uterus, and oviduct have functional molecular clocks. Evidence supports the notion that the clocks in these tissues contribute to the timing of events in reproductive physiology. The aim of this review is to highlight the current evidence for molecular clock function in the peripheral components of the female hypothalamo-pituitary-gonadal axis as it relates to the timing of gonadotropin secretion, ovulation, and parturition.
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Affiliation(s)
- Michael T. Sellix
- Department of Medicine, Division of Endocrinology and Metabolism, School of Medicine and Dentistry, University of Rochester, Rochester, NY, USA
- *Correspondence: Michael T. Sellix, Department of Medicine, Division of Endocrinology and Metabolism, School of Medicine and Dentistry, University of Rochester, 601 Elmwood Avenue, Rochester, NY 14642, USA e-mail:
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Kalsbeek A, Liu J, Lei J, Timmermans L, Foppen E, Cailotto C, Fliers E. Differential involvement of the suprachiasmatic nucleus in lipopolysaccharide-induced plasma glucose and corticosterone responses. Chronobiol Int 2012; 29:835-49. [PMID: 22823867 DOI: 10.3109/07420528.2012.699123] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The hypothalamic suprachiasmatic nucleus (SCN) is an essential component of the circadian timing system, and an important determinant of neuroendocrine and metabolic regulation. Recent data indicate a modulatory role for the immune system on the circadian timing system. The authors investigated how the circadian timing system affects the hypothalamo-pituitary-adrenal (HPA) axis and glucose regulatory responses evoked by an immune challenge induced by lipopolysaccharide (LPS). LPS-induced increases in corticosterone were minimal during the trough of the daily corticosterone rhythm; in contrast, LPS effects on glucose, glucagon, and insulin did not vary across time-of-day. Complete ablation of the SCN resulted in increased corticosterone responses but did not affect LPS-induced hyperglycemia. The paraventricular nucleus (PVN) of the hypothalamus is an important neuroendocrine and autonomic output pathway for hypothalamic information, as well as one of the main target areas of the SCN. Silencing the neuronal activity in the PVN did not affect the LPS-induced corticosterone surge and only slightly delayed the LPS-induced plasma glucose and glucagon responses. Finally, surgical interruption of the neuronal connection between hypothalamus and liver did not affect the corticosterone response but slightly delayed the LPS-induced glucose response. Together, these data support the previously proposed circadian modulation of LPS-induced neuroendocrine responses, but they are at variance with the suggested major role for the hypothalamic pacemaker on the autonomic output of the hypothalamus, as reflected by the effects of LPS on glucose homeostasis. The latter effects are more likely due to direct interactions of LPS with peripheral tissues, such as the liver.
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Affiliation(s)
- Andries Kalsbeek
- Department of Endocrinology and Metabolism, Academic Medical Center (AMC), University of Amsterdam, Amsterdam, The Netherlands.
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Soták M, Polidarová L, Ergang P, Sumová A, Pácha J. An association between clock genes and clock-controlled cell cycle genes in murine colorectal tumors. Int J Cancer 2012; 132:1032-41. [PMID: 22865596 DOI: 10.1002/ijc.27760] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2012] [Revised: 06/13/2012] [Accepted: 07/06/2012] [Indexed: 12/31/2022]
Abstract
Disruption of circadian machinery appears to be associated with the acceleration of tumor development. To evaluate the function of the circadian clock during neoplastic transformation, the daily profiles of the core clock genes Per1, Per2, Rev-Erbα and Bmal1, the clock-controlled gene Dbp and the clock-controlled cell cycle genes Wee1, c-Myc and p21 were detected by real-time RT-PCR in chemically induced primary colorectal tumors, the surrounding normal tissue and in the liver. The circadian rhythmicity of Per1, Per2, Rev-Erbα and Dbp was significantly reduced in tumor compared with healthy colon and the rhythmicity of Bmal1 was completely abolished. Interestingly, the circadian expression of Per1, Per2, Rev-Erbα and Dbp persisted in the colonic tissue surrounding the tumor but the rhythmic expression of Bmal1 was also abolished. Daily profiles of Wee1, c-Myc and p21 did not exhibit any rhythmicity either in tumors or in the colon of healthy animals. The absence of diurnal rhythmicity of cell cycle genes was partially associated with ageing, because young healthy mice showed rhythmicity in the core clock genes as well as in the Wee1 and p21. In the liver of tumor-bearing mice the clock gene rhythms were temporally shifted. The data suggest that the circadian regulation is distorted in colonic neoplastic tissue and that the gene-specific disruption may be also observed in the non-neoplastic tissues. These findings reinforce the role of peripheral circadian clockwork disruption for carcinogenesis and tumor progression.
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Affiliation(s)
- Matúš Soták
- Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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Chu G, Misawa I, Chen H, Yamauchi N, Shigeyoshi Y, Hashimoto S, Hattori MA. Contribution of FSH and triiodothyronine to the development of circadian clocks during granulosa cell maturation. Am J Physiol Endocrinol Metab 2012; 302:E645-53. [PMID: 22205630 DOI: 10.1152/ajpendo.00470.2011] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The involvement of FSH and triiodothyronine (T(3)) in circadian clocks was investigated using immature granulosa cells of ovaries during the progress of cell maturation. Granulosa cells were prepared from preantral follicles of mouse Period2 (Per2)-dLuc reporter gene transgenic rats injected subcutaneously with the synthetic nonsteroidal estrogen diethylstilbestrol. Analysis of the cellular clock of the immature granulosa cells was performed partly using a serum-free culture system. Several bioluminescence oscillations of Per2-dLuc promoter activity were generated in the presence of FSH + fetal bovine serum, but not in the presence of either FSH or serum. As revealed by bioluminescence recording and analysis of clock gene expression, the granulosa cells lack the functional cellular clock at the immature stage, although Lhr was greatly expressed during the period of cell maturation. The granulosa cells gained a strong circadian rhythm of bioluminescence during stimulation with FSH, whereas LH reset the cellular clock of matured granulosa cells. During strong circadian rhythms of clock genes, the Star gene showed significant expression in matured granulosa cells. In contrast, T(3) showed an inhibitory effect on the development of the functional cellular clock during the period of cell maturation. These results indicate that FSH provides a cue for the development of the functional cellular clock of the immature granulosa cells, and T(3) blocks the development of the cellular clock.
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Affiliation(s)
- Guiyan Chu
- Dept. of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, Fukuoka-shi, Fukuoka, Japan
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Takemiya T. Prostaglandin E2 produced by microsomal prostaglandin E synthase-1 regulates the onset and the maintenance of wakefulness. Neurochem Int 2011; 59:922-4. [PMID: 21784115 DOI: 10.1016/j.neuint.2011.07.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2011] [Revised: 06/28/2011] [Accepted: 07/01/2011] [Indexed: 10/18/2022]
Abstract
This study examined the effect of prostaglandin E(2) (PGE(2)) produced by microsomal prostaglandin E synthase-1 (mPGES-1) on circadian rhythm. Using wild-type mice (WT) and mPGES-1 knockout mice (mPGES-1(-/-)), I recorded and automatically analyzed the natural behavior of mice in home cages for 24h and measured brain levels of PGE(2). The switch to wakefulness was not smooth, and sleepiness and the total duration of sleep were significantly longer in the mPGES-1(-/-) mice. Moreover, the basal concentration of PGE(2) was significantly lower in the mPGES-1(-/-) mice. These findings suggest that PGE(2) produced by mPGES-1 regulates the onset of wakefulness and the maintenance of circadian rhythm.
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Affiliation(s)
- Takako Takemiya
- Medical Research Institute, Tokyo Women's Medical University, Shinjuku, Tokyo 162-8666, Japan.
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McGlynn OF, Browne JA, Blake CM, Murphy BA. Time of day influences cytokine and clock gene response to immune stimulation in equine whole blood. Anim Genet 2010. [DOI: 10.1111/j.1365-2052.2010.02109.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Systems biology is a natural extension of molecular biology; it can be defined as biology after identification of key gene(s). Systems-biological research is a multistage process beginning with (a) the comprehensive identification and (b) quantitative analysis of individual system components and their networked interactions, which lead to the ability to (c) control existing systems toward the desired state and (d) design new ones based on an understanding of the underlying structure and dynamical principles. In this review, we use the mammalian circadian clock as a model system and describe the application of systems-biological approaches to fundamental problems in this model. This application has allowed the identification of transcriptional/posttranscriptional circuits, the discovery of a temperature-insensitive period-determining process, and the discovery of desynchronization of individual clock cells underlying the singularity behavior of mammalian clocks.
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Affiliation(s)
- Hideki Ukai
- Laboratory for Systems Biology, RIKEN Center for Developmental Biology, Hyogo, Japan
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de Zavalía N, Fernandez DC, Sande PH, Keller Sarmiento MI, Golombek DA, Rosenstein RE, Silberman DM. Circadian variations of prostaglandin E2 and F2 α release in the golden hamster retina. J Neurochem 2010; 112:972-9. [DOI: 10.1111/j.1471-4159.2009.06517.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Affiliation(s)
- R Daniel Rudic
- Department of Pharmacology and Toxicology, Medical College of Georgia, Augusta, GA 30912, USA.
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Abstract
Many circadian rhythms are controlled by the central clock of the suprachiasmatic nucleus of the hypothalamus, as well as clocks located in other brain regions and most peripheral tissues. These central and peripheral clocks are based on clock genes and their protein products. In recent years, the expression of clock genes has started to be investigated in human samples, primarily white blood cells, but also skin, oral mucosa, colon cells, adipose tissue as well as post-mortem brain tissue. The expression of clock genes in those peripheral tissues offers a way to monitor human peripheral clocks and to compare their function and regulation with those of the central clock, which is followed by markers such as melatonin, cortisol and core body temperature. We have recently used such an approach to compare central and peripheral rhythms in subjects under different lighting conditions. In particular, we have monitored the entrainment of the clock of blood cells in subjects undergoing a simulated night shift protocol with bright light treatment, known to efficiently reset the central clock. This line of research will be helpful for learning more about the human circadian system and to find ways to alleviate health problems of shift workers, and other populations experiencing altered circadian rhythms.
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Affiliation(s)
- N Cermakian
- Laboratory of Molecular Chronobiology, Douglas Mental Health University Institute, Department of Psychiatry, McGill University, Montreal, QC, Canada.
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Abstract
Circadian clocks are molecular time-keeping systems that underlie daily fluctuations in multiple physiological and biochemical processes. It is well recognized now that dysfunctions of the circadian system (both genetically and environmentally induced) are associated with the development of various pathological conditions. Here we describe the application of high throughput screening approach designed to search for small molecules capable of pharmacological modulation of the molecular clock. We provide evidence for the feasibility and value of this approach for both scientific and therapeutic purposes.
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Affiliation(s)
- Marina P. Antoch
- Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
| | - Mikhail V. Chernov
- Small Molecule Screening Core, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
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Up-regulation of circadian clock gene Period 2 in the prostate mesenchymal cells during flutamide-induced apoptosis. Mol Cell Biochem 2009; 335:37-45. [PMID: 19714448 DOI: 10.1007/s11010-009-0238-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Accepted: 08/13/2009] [Indexed: 10/20/2022]
Abstract
Androgen regulates the proper development and physiological function of the prostate. Here, we investigated the modulation of androgen and androgen receptor (AR) antagonist on circadian oscillations of a clock core gene Period 2 (Per2) in rat prostate mesenchymal cells (PMCs). Circadian oscillations were analyzed with the real-time monitoring system of gene expression using transgenic rats introduced with mouse Per2 promoter fused to a destabilized luciferase (Per2-dLuc) reporter gene. Analyses of circadian oscillations, immunofluorescence, and androgen response element (ARE)-luciferase reporter assay revealed that circadian clocks are operative and the AR protein is functional in PMCs in vitro. Androgen such as testosterone (T) and dihydrotestosterone (DHT) did not cause any changes in circadian Per2-dLuc oscillations of confluent cells. Conversely, flutamide (FL) up-regulated the amplitude of circadian Per2-dLuc oscillations in a dose-dependent manner, whereas T antagonized the action of FL. The PER2 protein was markedly accumulated by FL treatment and localized in both the nucleus and cytoplasm during the first peak period of circadian Per2-dLuc oscillations. Simultaneously, FL treatment increased apoptotic cell death. Collectively, the present study demonstrates that a clock gene Per2 is up-regulated in PMCs during FL-induced apoptotic cell death. Thus, circadian oscillations of Per2 gene expression may be closely linked to the cellular states of PMCs such as apoptotic cell death.
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Mayer CM, Fick LJ, Gingerich S, Belsham DD. Hypothalamic cell lines to investigate neuroendocrine control mechanisms. Front Neuroendocrinol 2009; 30:405-23. [PMID: 19341762 DOI: 10.1016/j.yfrne.2009.03.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Revised: 03/10/2009] [Accepted: 03/17/2009] [Indexed: 12/22/2022]
Abstract
The hypothalamus is the control center for most physiological processes; yet has been difficult to study due to the inherent heterogeneity of this brain region. For this reason, researchers have turned towards cell models. Primary hypothalamic cultures are difficult to maintain, are heterogeneous neuronal and glial cell populations and often contain a minimal number of viable peptide-secreting neurons. In contrast, immortalized, clonal cell lines represent an unlimited, homogeneous population of neurons that can be manipulated using a number of elegant molecular techniques. Cell line studies and in vivo experimentation are complementary and together provide a powerful tool to drive scientific discovery. This review focuses on three key neuroendocrine systems: energy homeostasis, reproduction, and circadian rhythms; and the use of hypothalamic cell lines to dissect the complex pathways utilized by individual neurons in these systems.
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Murphy BA. Chronobiology and the horse: recent revelations and future directions. Vet J 2009; 185:105-14. [PMID: 19427248 DOI: 10.1016/j.tvjl.2009.04.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 04/08/2009] [Accepted: 04/10/2009] [Indexed: 01/13/2023]
Abstract
The circadian system provides animals with a means to adapt their internal physiology to the constantly changing environmental stimuli that exist on a rotating planet. Light information is translated into molecular timing mechanisms within pacemaker cells of the mammalian hypothalamic suprachiasmatic nucleus (SCN) via transcriptional-translational feedback loops. Humoral and neural outputs from this 'master' clock result in circadian rhythms of physiology and behaviour. The larger circadian system involves SCN synchronisation of cellular clocks throughout the organism such that individual organs can adapt their specific function to the time of day. In the short history of this scientific field, the vast majority of mammalian chronobiological research has been conducted using small laboratory animals. This review examines what these studies have revealed, discusses how recent chronobiological findings in the horse compare to what is known and highlights how the principles of circadian biology are applicable to equine husbandry and veterinary care.
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Affiliation(s)
- Barbara A Murphy
- School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Belfield, Dublin 4, Ireland.
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Hirata M, He PJ, Shibuya N, Uchikawa M, Yamauchi N, Hashimoto S, Hattori MA. Progesterone, but not estradiol, synchronizes circadian oscillator in the uterus endometrial stromal cells. Mol Cell Biochem 2008; 324:31-8. [DOI: 10.1007/s11010-008-9981-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2008] [Accepted: 11/28/2008] [Indexed: 11/29/2022]
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Ueda HR. Systems biology of mammalian circadian clocks. COLD SPRING HARBOR SYMPOSIA ON QUANTITATIVE BIOLOGY 2008; 72:365-80. [PMID: 18419294 DOI: 10.1101/sqb.2007.72.047] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Systems Biology is a natural extension of molecular biology and can be defined as biology after identification of key gene(s). Systems-biological research is hence seen as a multistage process, beginning with the comprehensive identification and quantitative analysis of individual system components and their networked interactions and leading to the ability to control existing systems toward the desired state and design new ones based on an understanding of structure and underlying dynamical principles. In this chapter, we take mammalian circadian clocks as a model system and describe systems-biological approaches, including the identification of clock-controlled genes, clock-controlled cis elements, and clock transcriptional circuits driven by functional genomics; the parameter change of clock components followed by quantitative measurement; and the dynamic and quantitative perturbation of the clock and its application to one of the fundamental but yet-unsolved questions: singularity behavior of clocks. As perspective for systems-biological investigations, we also introduce the system-level dynamical questions related to the core of clocks, including delay, nonlinearity, temperature-compensation and synchronization of mammalian circadian oscillator(s), and the system-level information problems related to clocks in the environment, including the internal representation of light change through perfect adaptation and internal representation of day length through photoperiodism in mammals.
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Affiliation(s)
- H R Ueda
- Laboratory for Systems Biology and Functional Genomics Unit, Center for Developmental Biology, Riken, Kobe, Hyogo 650-0047, Japan
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39
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Coogan AN, Wyse CA. Neuroimmunology of the circadian clock. Brain Res 2008; 1232:104-12. [PMID: 18703032 DOI: 10.1016/j.brainres.2008.07.087] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2008] [Revised: 03/31/2008] [Accepted: 07/11/2008] [Indexed: 12/12/2022]
Abstract
Circadian timekeeping is a ubiquitous feature of all eukaryotes which allows for the imposition of a biologically appropriate temporal architecture on an animal's physiology, behavior and metabolism. There is growing evidence that in mammals the processes of circadian timing are under the influence of the immune system. Such a role for the neuroimmune regulation of the circadian clock has inferences for phenomena such as sickness behavior. Conversely, there is also accumulating evidence for a circadian influence on immune function, raising the likelihood that there is a bidirectional communication between the circadian and immune systems. In this review, we examine the evidence for these interactions, including circadian rhythmicity in models of disease and immune challenge, distribution of cytokines and their receptors in the suprachiasmatic nucleus of the hypothalamus, the site of the master circadian pacemaker, and the evidence for endogenous circadian timekeeping in immune cells.
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Affiliation(s)
- Andrew N Coogan
- Neuroscience and Molecular Psychiatry, Institute of Life Science, School of Medicine, Swansea University, Swansea, SA2 8PP, UK.
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40
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Janecka IP. Colon Cancer and Physical Activity: A Content Analysis of Reciprocal Relationship. Clin Med Oncol 2007. [DOI: 10.4137/cmo.s299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Background Colon cancer is among the leading causes of cancer mortality and its incidence is increasing worldwide. This is true in spite of broad basic research into colon cancer while, concurrently, physical activity has been shown to offer significant preventive potential. This background led to the formulation of the following research questions: • Why is physical activity so effective in decreasing the incidence of colon cancer? • Is there a common denominator to colon cancer and physical activity, which has a reciprocal function? • Knowing the potential for public health impact of physical activity on colon cancer, has physical activity-colon cancer relationship been in the forefront of research efforts? Methods Content analysis of archival literature has been carried out on census of 32,822 message units, extracted from the National Library of Medicine and its PubMed database. The following search terms were used: colon cancer, physical activity, melatonin, age/genetics, diet (obesity, vitamin D, calcium), immunity/inflammation, and bioactive substances incorporating insulin-like growth factor 1, interleukins, and prostaglandins. The research timeframe for each category began with the first article published and ended with the last one printed in 2005. Results/Conclusions The effectiveness of physical activity in decreasing the incidence of colon cancer is likely the result of its biologic activity within not one or two but all of the major known colon cancer etiologies, demonstrating a powerful reciprocal relationship. Melatonin is identified as a plausible common denominator of colon cancer and physical activity. The greatest volume of publications deals with colon cancer and genetics. A significant societal health care impact could be achieved by adopting physical activity as a major cancer control strategy.
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Young ME, Bray MS. Potential role for peripheral circadian clock dyssynchrony in the pathogenesis of cardiovascular dysfunction. Sleep Med 2007; 8:656-67. [PMID: 17387040 PMCID: PMC2020822 DOI: 10.1016/j.sleep.2006.12.010] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2006] [Revised: 12/05/2006] [Accepted: 12/30/2006] [Indexed: 10/23/2022]
Abstract
Circadian clocks are intracellular molecular mechanisms designed to allow the cell, organ, and organism to prepare for an anticipated stimulus prior to its onset. In order for circadian clocks to maintain their selective advantage, they must be entrained to the environment. Light, sound, temperature, physical activity (including sleep/wake transitions), and food intake are among the strongest environmental factors influencing mammalian circadian clocks. Normal circadian rhythmicities in these environmental factors have become severely disrupted in our modern day society, concomitant with increased incidence of type 2 diabetes mellitus, obesity, and cardiovascular disease. Here, we review our current knowledge regarding the roles of peripheral circadian clocks, concentrating on those found within tissues directly involved in metabolic homeostasis and cardiovascular function. We propose that both inter- and intra-organ dyssynchronization, through alteration/impairment of peripheral circadian clocks, accelerates the development of cardiovascular disease risk factors associated with cardiometabolic syndrome.
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Affiliation(s)
- Martin E Young
- USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, 1100 Bates Street, Houston, TX 77030, USA.
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He PJ, Hirata M, Yamauchi N, Hashimoto S, Hattori MA. Gonadotropic regulation of circadian clockwork in rat granulosa cells. Mol Cell Biochem 2007; 302:111-8. [PMID: 17483911 DOI: 10.1007/s11010-007-9432-7] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2006] [Accepted: 02/09/2007] [Indexed: 10/23/2022]
Abstract
The circadian clock is responsible for the generation of circadian rhythms in hormonal secretion and metabolism. These peripheral clocks could be reset by various cues in order to adapt to environmental variations. The ovary can be characterized as having highly dynamic physiology regulated by gonadotropins. Here, we aimed to address the status of circadian clock in the ovary, and to explore how gonadotropins could regulate clockwork in granulosa cells (GCs). To this end, we mainly utilized the immunohistochemistry, RT-PCR, and real-time monitoring of gene expression methods. PER1 protein was constantly abundant across the daily cycle in the GCs of immature ovaries. In contrast, PER1 protein level was obviously cyclic through the circadian cycle in the luteal cells of pubertal ovaries. In addition, both FSH and LH induced Per1 expression in cultured immature and mature GCs, respectively. The promoter analysis revealed that the Per1 expression was mediated by the cAMP response element binding protein. In cultured transgenic GCs, both FSH and LH also induced the circadian oscillation of Per2. However, the Per2 oscillation promoted by FSH quickly dampened within only one cycle, whereas the Per2 oscillation promoted by LH was persistently maintained. Collectively, these findings strongly suggest that both FSH and LH play an important role in regulating circadian clock in the ovary; however, they might exert differential actions on the clockwork in vivo due to each specific role within ovarian physiology.
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Affiliation(s)
- Pei-Jian He
- Laboratory of Reproductive Physiology and Biotechnology, Department of Animal and Marine Bioresource Sciences, Graduate School of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
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Murphy BA, Vick MM, Sessions DR, Cook RF, Fitzgerald BP. Acute systemic inflammation transiently synchronizes clock gene expression in equine peripheral blood. Brain Behav Immun 2007; 21:467-76. [PMID: 17174528 DOI: 10.1016/j.bbi.2006.11.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2006] [Revised: 10/26/2006] [Accepted: 11/02/2006] [Indexed: 01/08/2023] Open
Abstract
Peripheral clocks receive timing signals from the master mammalian pacemaker in the suprachiasmatic nucleus (SCN) and function to adaptively anticipate daily changes that influence local physiology. Evidence suggests that peripheral immune activation may act as a resetting signal for circadian clocks in peripheral tissues. We wished to investigate whether acute systemic inflammation could synchronize clock gene expression in equine peripheral blood, a tissue that does not normally oscillate in this species. We report that in vivo administration of lipopolysaccharide (LPS) results in significant upregulation of the core clock genes Per2 and Bmal1 in equine blood, in association with an acute rise in tumor necrosis factor (TNF) alpha and core body temperature compared to vehicle-treated control animals. Furthermore, co-administration of LPS and phenylbutazone, a non-steroidal anti-inflammatory drug (NSAID) known to inhibit prostaglandin (PG) E(2) synthesis in the horse, prevents both the febrile response and the synchronized increase in clock gene expression. However, the rise in Per2 and Bmal1 expression cannot be replicated in equine peripheral blood mononuclear cells (PBMCs) ex vivo by treatment with PGE(2), LPS or a heat shock mimicking the in vivo febrile response. These results may suggest an indirect communication pathway between immune modulators and the molecular machinery of cell clocks in peripheral blood. This potential immune feedback regulation of an equine peripheral clock implies a role for the circadian system in contributing to innate immune reactions and maintaining homeostasis in a tissue that acts as the first line of defense during an infectious challenge.
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Affiliation(s)
- Barbara A Murphy
- Maxwell H. Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington, KY 40546-0099, USA.
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Izumo M, Sato TR, Straume M, Johnson CH. Quantitative analyses of circadian gene expression in mammalian cell cultures. PLoS Comput Biol 2006; 2:e136. [PMID: 17040123 PMCID: PMC1599765 DOI: 10.1371/journal.pcbi.0020136] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2006] [Accepted: 08/28/2006] [Indexed: 01/17/2023] Open
Abstract
The central circadian pacemaker is located in the hypothalamus of mammals, but essentially the same oscillating system operates in peripheral tissues and even in immortalized cell lines. Using luciferase reporters that allow automated monitoring of circadian gene expression in mammalian fibroblasts, we report the collection and analysis of precise rhythmic data from these cells. We use these methods to analyze signaling pathways of peripheral tissues by studying the responses of Rat-1 fibroblasts to ten different compounds. To quantify these rhythms, which show significant variation and large non-stationarities (damping and baseline drifting), we developed a new fast Fourier transform–nonlinear least squares analysis procedure that specifically optimizes the quantification of amplitude for circadian rhythm data. This enhanced analysis method successfully distinguishes among the ten signaling compounds for their rhythm-inducing properties. We pursued detailed analyses of the responses to two of these compounds that induced the highest amplitude rhythms in fibroblasts, forskolin (an activator of adenylyl cyclase), and dexamethasone (an agonist of glucocorticoid receptors). Our quantitative analyses clearly indicate that the synchronization mechanisms by the cAMP and glucocorticoid pathways are different, implying that actions of different genes stimulated by these pathways lead to distinctive programs of circadian synchronization. The circadian biological clock controls the adaptation of animals and plants to the daily environmental cycle of light and darkness. As such, this clock is responsible for jet lag and has consequences for mental health (e.g., depression), physical health (e.g., athletic performance and the timing of heart attacks), and social issues (e.g., shift work). The central circadian pacemaker is located in the hypothalamus of the mammalian brain, but essentially the same oscillating system operates in nonneural tissues. Using luciferase, an enzyme that emits light, the authors could monitor circadian gene expression in mammalian fibroblasts via luminescence emission that is controlled by the biological clock. Using this method, they report the collection and analysis of precise rhythmic data from these cells. These methods were used to analyze signaling pathways by studying the responses of fibroblasts to a variety of different treatments, including drugs, growth factors, and serum. The authors developed a new analysis procedure that specifically optimizes the quantification of amplitude for cyclic data to analyze these rhythms. This enhanced analysis method successfully distinguishes among the various signaling treatments for their rhythm inducing properties. The quantitative analyses clearly indicate that the synchronization mechanisms by the cyclic AMP and glucocorticoid pathways are different. Therefore, these pathways lead to distinctive programs of circadian synchronization.
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Affiliation(s)
- Mariko Izumo
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Takashi R Sato
- Cold Spring Harbor Laboratory, Cold Spring Harbor, New York, United States of America
| | - Martin Straume
- Customized Online Biomathematical Research Applications, Charlottesville, Virginia, United States of America
| | - Carl Hirschie Johnson
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee, United States of America
- * To whom correspondence should be addressed. E-mail:
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Stratmann M, Schibler U. Properties, entrainment, and physiological functions of mammalian peripheral oscillators. J Biol Rhythms 2006; 21:494-506. [PMID: 17107939 DOI: 10.1177/0748730406293889] [Citation(s) in RCA: 192] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In mammals, the circadian timing system is composed of multiple oscillators that are organized in a hierarchical manner. The central pacemaker, located in the suprachiasmatic nucleus of the hypothalamus, is believed to orchestrate countless subsidiary clocks in the periphery. These peripheral oscillators are cell-autonomous, self-sustained, resilient to cell division, and virtually insensitive to large fluctuations in general transcription rates. However, they are probably not coupled within an organ, and daily zeitgeber signals emanating from the SCN appear to be required to ensure phase coherence within and between tissues. Peripheral clocks are implicated in a variety of biochemical pathways, and recent results tightly link circadian rhythms to several aspects of metabolism. Thus, the expression of many key enzymes conducting rate-limiting steps in various metabolic pathways is regulated in a circadian fashion by core clock components or clock-controlled transcription factors. Genetic loss-of-function studies have now established a role for mammalian circadian clock components in energy homeostasis and xenobiotic detoxification, and the latter manifests itself in the daytime-dependent modulation of drug efficacy and toxicity.
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Affiliation(s)
- Markus Stratmann
- Department of Molecular Biology, National Center of Competence in Research Frontiers in Genetics, Sciences III, University of Geneva, Geneva, Switzerland
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Nakahata Y, Akashi M, Trcka D, Yasuda A, Takumi T. The in vitro real-time oscillation monitoring system identifies potential entrainment factors for circadian clocks. BMC Mol Biol 2006; 7:5. [PMID: 16483373 PMCID: PMC1386696 DOI: 10.1186/1471-2199-7-5] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2005] [Accepted: 02/16/2006] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Circadian rhythms are endogenous, self-sustained oscillations with approximately 24-hr rhythmicity that are manifested in various physiological and metabolic processes. The circadian organization of these processes in mammals is governed by the master oscillator within the suprachiasmatic nuclei (SCN) of the hypothalamus. Recent findings revealed that circadian oscillators exist in most organs, tissues, and even in immortalized cells, and that the oscillators in peripheral tissues are likely to be coordinated by SCN, the master oscillator. Some candidates for endogenous entrainment factors have sporadically been reported, however, their details remain mainly obscure. RESULTS We developed the in vitro real-time oscillation monitoring system (IV-ROMS) by measuring the activity of luciferase coupled to the oscillatory gene promoter using photomultiplier tubes and applied this system to screen and identify factors able to influence circadian rhythmicity. Using this IV-ROMS as the primary screening of entrainment factors for circadian clocks, we identified 12 candidates as the potential entrainment factor in a total of 299 peptides and bioactive lipids. Among them, four candidates (endothelin-1, all-trans retinoic acid, 9-cis retinoic acid, and 13-cis retinoic acid) have already been reported as the entrainment factors in vivo and in vitro. We demonstrated that one of the novel candidates, 15-deoxy-Delta12,14-prostaglandin J2 (15d-PGJ2), a natural ligand of the peroxisome proliferator-activated receptor-gamma (PPAR-gamma), triggers the rhythmic expression of endogenous clock genes in NIH3T3 cells. Furthermore, we showed that 15d-PGJ2 transiently induces Cry1, Cry2, and Roralpha mRNA expressions and that 15d-PGJ2-induced entrainment signaling pathway is PPAR-gamma--and MAPKs (ERK, JNK, p38MAPK)-independent. CONCLUSION Here, we identified 15d-PGJ2 as an entrainment factor in vitro. Using our developed IV-ROMS to screen 299 compounds, we found eight novel and four known molecules to be potential entrainment factors for circadian clocks, indicating that this assay system is a powerful and useful tool in initial screenings.
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Affiliation(s)
| | - Makoto Akashi
- Osaka Bioscience Institute, Suita, Osaka 565-0874, Japan
| | - Daniel Trcka
- Osaka Bioscience Institute, Suita, Osaka 565-0874, Japan
| | - Akio Yasuda
- Life Science Laboratory, Material Laboratories, Sony Corporation, Shinagawa, Tokyo 144-0001, Japan
| | - Toru Takumi
- Osaka Bioscience Institute, Suita, Osaka 565-0874, Japan
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Young ME. The circadian clock within the heart: potential influence on myocardial gene expression, metabolism, and function. Am J Physiol Heart Circ Physiol 2006; 290:H1-16. [PMID: 16373589 DOI: 10.1152/ajpheart.00582.2005] [Citation(s) in RCA: 153] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
It is becoming increasingly clear that the intrinsic properties of both the heart and vasculature exhibit dramatic oscillations over the course of the day. Diurnal variations in the responsiveness of the cardiovascular system to environmental stimuli are mediated by a complex interplay between extracellular (i.e., neurohumoral factors) and intracellular (i.e., circadian clock) influences. The intracellular circadian clock is composed of a series of transcriptional modulators that together allow the cell to perceive the time of day, thereby enabling preparation for an anticipated stimulus. These molecular timepieces have been characterized recently within both vascular smooth muscle cells and cardiomyocytes, giving rise to a multitude of hypotheses relating to the potential role(s) of the circadian clock as a modulator of physiological and pathophysiological cardiovascular events. For example, evidence strongly supports the hypothesis that the circadian clock within the heart modulates myocardial metabolism, which in turn facilitates anticipation of diurnal variations in workload, substrate availability, and/or the energy supply-to-demand ratio. The purpose of this review is therefore to summarize our current understanding of the molecular events governing diurnal variations in the intrinsic properties of the heart, with special emphasis on the intramyocardial circadian clock. Whether impairment of this molecular mechanism contributes toward cardiovascular disease associated with hypertension, diabetes mellitus, shift work, sleep apnea, and/or obesity will be discussed.
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Affiliation(s)
- Martin E Young
- United States Dept. of Agriculture/Agricultural Research Service Children's Nutrition Research Center, Dept. of Pediatrics, Baylor College of Medicine, 1100 Bates St., Houston, TX 77030, USA.
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Abstract
Cyclooxygenase (COX) enzymes catalyse the biotransformation of arachidonic acid to prostaglandins which subserve important functions in cardiovascular homeostasis. Prostacyclin (PGI2) and prostaglandin (PG)E2, dominant products of COX activityin macro- and microvascular endothelial cells, respectively, in vitro, modulate the interaction of blood cells with the vasculature and contribute to the regulation of blood pressure. COXs are the target for inhibition by nonsteroidal anti-inflammatory drugs (NSAIDs--which include those selective for COX-2) and for aspirin. Modulation of the interaction between COX products of the vasculature and platelets underlies both the cardioprotection afforded by aspirin and the cardiovascular hazard which characterises specific inhibitors of COX-2.
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Affiliation(s)
- K Egan
- Institute for Translational Medicine and Therapeutics, School of Medicine, University of Pennsylvania, 153 Johnson Pavilion, Philadelphia, PA 19104, USA
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Dolatshad H, Campbell EA, O'Hara L, Maywood ES, Hastings MH, Johnson MH. Developmental and reproductive performance in circadian mutant mice. Hum Reprod 2006; 21:68-79. [PMID: 16210390 DOI: 10.1093/humrep/dei313] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Genes underlying circadian rhythm generation are expressed in many tissues. We explore a role for circadian rhythms in the timing and efficacy of mouse reproduction and development using a genetic approach. METHODS We compare fecundity in Clock(Delta19) mutant mice (a dominant-negative protein essential for circadian rhythm activity) and in Vipr2-/- null mutant mice (affecting the generation and output of the circadian rhythm of the hypothalamic suprachiasmatic nucleus) with wild type (WT) litter mates under both a 12 h:12 h light:dark cycle and continuous darkness. RESULTS Uteri from Clock(Delta19) mice show no circadian rhythm and Vipr2-/- mice show a phase-advanced rhythm compared to WT uteri. In neither mutant line were homozygous or heterozygous fetuses lethal. Sexually mature adults of both mutant lines showed mildly reduced male in vivo (but not in vitro) fertility and irregular estrous cycles exacerbated by continuous darkness. However, pregnancy rates and neonatal litter sizes were not affected. The Clock(Delta19) mutant line was distinguishable from the Vipr2-/- null mutant line in showing more peri-natal delivery problems and very poor survival of offspring to weaning. CONCLUSIONS A fully functional central and peripheral circadian clock is not essential for reproduction and development to term, but has critical roles peri-natally and post-partum.
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Affiliation(s)
- H Dolatshad
- Department of Anatomy, Downing Street, Cambridge CB2 3DY, UK
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