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https://www.readbyqxmd.com/read/29770483/melatonin-modulates-dysregulated-circadian-clocks-in-mice-with-diethylnitrosamine-induced-hepatocellular-carcinoma
#1
Diana I Sánchez, Bárbara González-Fernández, Irene Crespo, Beatriz San-Miguel, Marcelino Álvarez, Javier González-Gallego, María Jesús Tuñón
Disruption of circadian rhythms, which are regulated by the circadian clock machinery, plays an important role in different long-term diseases including hepatocellular carcinoma (HCC). Melatonin has been reported to alleviate promotion and progression of HCC, but the potential contribution of circadian clock modulation is unknown. We investigated the effects of melatonin in mice which received diethylnitrosamine (DEN) (35 mg/kg body weight i.p.) once a week for 8 weeks. Melatonin was given at 5 or 10 mg/kg/day i...
May 16, 2018: Journal of Pineal Research
https://www.readbyqxmd.com/read/29765408/the-interaction-between-bmal1-and-per2-in-mouse-bmsc-osteogenic-differentiation
#2
Haiya Zhuo, Yuhong Wang, Qing Zhao
The circadian clock is a system that controls endogenous time of organisms, and it regulates the physiology and behavior of bodies. The transcription factors Brain and Muscle ARNT-like Protein 1 (BMAL1) and Period2 (Per2) are components of the circadian clock, and they play vital roles in circadian clock function. Both Bmal1-/- mice and Per2-/- mice display obvious bone volume changes. In this study, we inhibited the expression of Bmal1 in bone marrow-derived mesenchymal stem cells (BMSCs) using a lentiviral vector harboring RNAi sequences, which increased the osteogenic differentiation capability of BMSCs...
2018: Stem Cells International
https://www.readbyqxmd.com/read/29761750/obesity-disrupts-rhythmic-clock-gene-expression-in-maternal-adipose-tissue-during-rat-pregnancy
#3
Rachael C Crew, Peter J Mark, Brendan J Waddell
Obesity during pregnancy causes numerous maternal and fetal health complications, but the underlying mechanisms remain unclear. Adipose tissue dysfunction in obesity has previously been linked to disruption of the intrinsic adipose clock gene network that is crucial for normal metabolic function. This adipose clock also undergoes major change as part of the maternal metabolic adaptation to pregnancy, but whether this is affected by maternal obesity is unknown. Consequently, in this study we tested the hypothesis that obesity disturbs rhythmic gene expression in maternal adipose tissue across pregnancy...
June 2018: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/29760682/daily-gene-expression-rhythms-in-rat-white-adipose-tissue-do-not-differ-between-subcutaneous-and-intra-abdominal-depots
#4
Rianne van der Spek, Eric Fliers, Susanne E la Fleur, Andries Kalsbeek
White adipose tissue (WAT) is present in different depots throughout the body. Although all depots are exposed to systemic humoral signals, they are not functionally identical. Studies in clock gene knockout animals and in shift workers suggest that daily rhythmicity may play an important role in lipid metabolism. Differences in rhythmicity between fat depots might explain differences in depot function; therefore, we measured mRNA expression of clock genes and metabolic genes on a 3-h interval over a 24-h period in the subcutaneous inguinal depot and in the intra-abdominal perirenal, epididymal, and mesenteric depots of male Wistar rats...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29750810/mtor-signaling-regulates-central-and-peripheral-circadian-clock-function
#5
Chidambaram Ramanathan, Nimish D Kathale, Dong Liu, Choogon Lee, David A Freeman, John B Hogenesch, Ruifeng Cao, Andrew C Liu
The circadian clock coordinates physiology and metabolism. mTOR (mammalian/mechanistic target of rapamycin) is a major intracellular sensor that integrates nutrient and energy status to regulate protein synthesis, metabolism, and cell growth. Previous studies have identified a key role for mTOR in regulating photic entrainment and synchrony of the central circadian clock in the suprachiasmatic nucleus (SCN). Given that mTOR activities exhibit robust circadian oscillations in a variety of tissues and cells including the SCN, here we continued to investigate the role of mTOR in orchestrating autonomous clock functions in central and peripheral circadian oscillators...
May 11, 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29748957/circadian-alignment-in-a-foster-mother-improves-the-offspring-s-pathological-phenotype
#6
Lucie Olejníková, Lenka Polidarová, Michal Behuliak, Martin Sládek, Alena Sumová
KEY POINTS: In mammals, the mother-offspring interaction is essential for health later in adulthood. The impact of altered timing and quality of maternal care on the offspring's circadian system was assessed using a cross-strain fostering approach. Better maternal care facilitated the development of amplitudes of Bmal1 clock gene expression in the central clock, as well as the clock-driven activity/rest rhythm, and also its entrainment to the external light/dark cycle. Worse maternal care impaired entrainment of the central clock parameters in the Wistar rat during the early developmental stages...
May 10, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29737878/involvement-of-cortisol-and-sirtuin1-during-the-response-to-stress-of-hypothalamic-circadian-system-and-food-intake-related-peptides-in-rainbow-trout-oncorhynchus-mykiss
#7
Fatemeh Naderi, Juan Hernández-Pérez, Mauro Chivite, José L Soengas, Jesús M Míguez, Marcos A López-Patiño
Stress is conditioning animal welfare by negatively affecting a wide range of physiological and behavioral functions. This may be applied to circadian physiology and food intake. Cortisol, the stress-related hormone, may mediate such effect of stress, but other indirect mediators might be considered, such as sirtuin1. Then, either the independent modulatory effect or the existence of any interaction between mediators may be responsible. The circadian system is the main modulator of several integrative mechanisms at both central and peripheral levels that are rhythmically presented, thus influencing different processes such as food intake...
May 8, 2018: Chronobiology International
https://www.readbyqxmd.com/read/29721962/the-retinal-circadian-clock-and-photoreceptor-viability
#8
Kenkichi Baba, Christophe P Ribelayga, P Michael Iuvone, Gianluca Tosini
Circadian rhythms are present in most living organisms, and these rhythms are not just a consequence of the day/night fluctuation, but rather they are generated by endogenous biological clocks with a periodicity of about 24 h. In mammals, the master pacemaker of circadian rhythms is localized in the suprachiasmatic nuclei (SCN) of the hypothalamus. The SCN controls circadian rhythms in peripheral organs. The retina also contains circadian clocks which regulate many aspects of retinal physiology, independently of the SCN...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29695531/timping-the-aorta-smooth-muscle-cell-specific-deletion-of-bmal1-limits-murine-abdominal-aortic-aneurysm-development
#9
EDITORIAL
Carla Winter, Oliver Soehnlein, Lars Maegdefessel
No abstract text is available yet for this article.
May 2018: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29671710/functionally-complete-excision-of-conditional-alleles-in-the-mouse-suprachiasmatic-nucleus-by-vgat-ires-cre
#10
David R Weaver, Vincent van der Vinne, E Lela Giannaris, Thomas J Vajtay, Kristopher L Holloway, Christelle Anaclet
Mice with targeted gene disruption have provided important information about the molecular mechanisms of circadian clock function. A full understanding of the roles of circadian-relevant genes requires manipulation of their expression in a tissue-specific manner, ideally including manipulation with high efficiency within the suprachiasmatic nuclei (SCN). To date, conditional manipulation of genes within the SCN has been difficult. In a previously developed mouse line, Cre recombinase was inserted into the vesicular GABA transporter (Vgat) locus...
April 2018: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/29671709/regulation-of-the-neuroligin-1-gene-by-clock-transcription-factors
#11
Lydia Hannou, Erika Bélanger-Nelson, Emma K O'Callaghan, Julien Dufort-Gervais, Maria Neus Ballester Roig, Pierre-Gabriel Roy, Jean-Martin Beaulieu, Nicolas Cermakian, Valérie Mongrain
NEUROLIGIN-1 (NLGN1) is a postsynaptic adhesion molecule involved in the regulation of glutamatergic transmission. It has been associated with several features of sleep and psychiatric disorders. Our previous work suggested that transcription of the Nlgn1 gene could be regulated by the transcription factors CLOCK and BMAL1 because they bind to the Nlgn1 gene promoter in vivo. However, whether CLOCK/BMAL1 can directly activate Nlgn1 transcription is not yet known. We thus aimed to verify whether CLOCK/BMAL1, as well as their homologs NPAS2 and BMAL2, can activate transcription via the Nlgn1 promoter by using luciferase assays in COS-7 cells...
April 2018: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/29626158/deubiquitinating-enzyme-usp9x-regulates-cellular-clock-function-by-modulating-the-ubiquitination-and-degradation-of-a-core-circadian-protein-bmal1
#12
Yang Zhang, Chunyan Duan, Jing Yang, Suping Chen, Qing Liu, Liang Zhou, Zhengyun Huang, Ying Xu, Guoqiang Xu
Living organisms on the earth maintain a roughly 24 h circadian rhythm, which is regulated by circadian clock genes as well as their protein products. Post-translational modifications of core clock proteins could affect the circadian behavior. Although ubiquitination of core clock proteins was studied extensively, the reverse process, deubiquitination, has only begun to unfold and the role of this regulation on circadian function is not completely understood. Here, we use affinity purification and mass spectrometry analysis to identify probable ubiquitin carboxyl-terminal hydrolase FAF-X (USP9X) as an interacting protein of the core clock protein aryl hydrocarbon receptor nuclear translocator-like protein 1 (ARNTL or BMAL1)...
April 6, 2018: Biochemical Journal
https://www.readbyqxmd.com/read/29615980/histamine-regulates-molecular-clock-oscillations-in-human-retinal-pigment-epithelial-cells-via-h-1-receptors
#13
Eri Morioka, Yuzuki Kanda, Hayato Koizumi, Tsubasa Miyamoto, Masayuki Ikeda
Vertebrate eyes are known to contain circadian clocks, but their regulatory mechanisms remain largely unknown. To address this, we used a cell line from human retinal pigment epithelium (hRPE-YC) with stable coexpression of reporters for molecular clock oscillations ( Bmal1-luciferase ) and intracellular Ca2+ concentrations ( YC3.6 ). We observed concentration-dependent increases in cytosolic Ca2+ concentrations after treatment with histamine (1-100 µM) and complete suppression of histamine-induced Ca2+ mobilizations by H1 histamine receptor (H1 R) antagonist d -chlorpheniramine ( d -CPA) in hRPE-YC cells...
2018: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29588368/clock-phosphorylation-by-akt-regulates-its-nuclear-accumulation-and-circadian-gene-expression-in-peripheral-tissues
#14
Amelia K Luciano, Wenping Zhou, Jeans M Santana, Cleo Kyriakides, Heino Velazquez, William C Sessa
Circadian locomotor output cycles kaput (CLOCK) is a transcription factor which activates transcription of clock-controlled genes (CCG) by heterodimerizing with BMAL1 and binding to E-box elements on DNA. While several phosphorylation sites on CLOCK have already been identified, this study characterizes a novel phosphorylation site at Serine 845 (S836 in humans). Here we show that CLOCK is a novel AKT substrate in vitro and in cells, and this phosphorylation site is a negative regulator of CLOCK nuclear localization by acting as a binding site for 14-3-3 proteins...
March 27, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29577261/clock-genes-alterations-and-endocrine-disorders
#15
REVIEW
Anna Angelousi, Eva Kassi, Narjes Nasiri-Ansari, Martin O Weickert, Harpal Randeva, Gregory Kaltsas
BACKGROUND: Various endocrine signals oscillate over the 24-hour period and so does the responsiveness of target tissues. These daily oscillations do not occur solely in response to external stimuli but are also under the control of an intrinsic circadian clock. DESIGN: We searched the PubMed database to identify studies describing the associations of clock genes with endocrine diseases. RESULTS: Various human single nucleotide polymorphisms of BMAL1 and CLOCK genes exhibited significant associations with type 2 diabetes mellitus...
March 25, 2018: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/29572261/clock-dependent-chromatin-topology-modulates-circadian-transcription-and-behavior
#16
Jérôme Mermet, Jake Yeung, Clémence Hurni, Daniel Mauvoisin, Kyle Gustafson, Céline Jouffe, Damien Nicolas, Yann Emmenegger, Cédric Gobet, Paul Franken, Frédéric Gachon, Félix Naef
The circadian clock in animals orchestrates widespread oscillatory gene expression programs, which underlie 24-h rhythms in behavior and physiology. Several studies have shown the possible roles of transcription factors and chromatin marks in controlling cyclic gene expression. However, how daily active enhancers modulate rhythmic gene transcription in mammalian tissues is not known. Using circular chromosome conformation capture (4C) combined with sequencing (4C-seq), we discovered oscillatory promoter-enhancer interactions along the 24-h cycle in the mouse liver and kidney...
March 1, 2018: Genes & Development
https://www.readbyqxmd.com/read/29556064/an-evolutionary-hotspot-defines-functional-differences-between-cryptochromes
#17
Clark Rosensweig, Kimberly A Reynolds, Peng Gao, Isara Laothamatas, Yongli Shan, Rama Ranganathan, Joseph S Takahashi, Carla B Green
Mammalian circadian clocks are driven by a transcription/translation feedback loop composed of positive regulators (CLOCK/BMAL1) and repressors (CRYPTOCHROME 1/2 (CRY1/2) and PER1/2). To understand the structural principles of regulation, we used evolutionary sequence analysis to identify co-evolving residues within the CRY/PHL protein family. Here we report the identification of an ancestral secondary cofactor-binding pocket as an interface in repressive CRYs, mediating regulation through direct interaction with CLOCK and BMAL1...
March 19, 2018: Nature Communications
https://www.readbyqxmd.com/read/29548611/circadian-calcium-feeding-regime-in-laying-hens-related-to-zinc-concentration-gene-expression-of-circadian-clock-calcium-transporters-and-oxidative-status
#18
Xue Lin, Yilin Liu, Tiantian Meng, Chunyan Xie, Xin Wu, Yulong Yin
The study was conducted to investigate the effects of different circadian calcium feeding regimes on parameters of Zn status and gene expression of circadian clock, calcium transporters and oxidative status in laying hens. In total, 180 of 41-weeks Brown Hy-line laying hens were assigned randomly into three groups, 1-CON group (Control Ca, diets contained 3.4% Ca at both 0730 and 1530 h), 2-HL group (High-low Ca, diets contained 3.6%-3.2% Ca respectively) and 3-LH group (Low-high Ca, diets contained 3.2%-3...
March 8, 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29543849/modulation-of-large-dense-core-vesicle-insulin-content-mediates-rhythmic-hormone-release-from-pancreatic-beta-cells-over-the-24h-cycle
#19
Aurore Quinault, Corinne Leloup, Geoffrey Denwood, Coralie Spiegelhalter, Marianne Rodriguez, Philippe Lefebvre, Nadia Messaddeq, Quan Zhang, Catherine Dacquet, Luc Pénicaud, Stephan C Collins
The rhythmic nature of insulin secretion over the 24h cycle in pancreatic islets has been mostly investigated using transcriptomics studies showing that modulation of insulin secretion over this cycle is achieved via distal stages of insulin secretion. We set out to measure β-cell exocytosis using in depth cell physiology techniques at several time points. In agreement with the activity and feeding pattern of nocturnal rodents, we find that C57/Bl6J islets in culture for 24h exhibit higher insulin secretion during the corresponding dark phase than in the light phase (Zeitgeber Time ZT20 and ZT8, respectively, in vivo)...
2018: PloS One
https://www.readbyqxmd.com/read/29540683/the-choroid-plexus-is-an-important-circadian-clock-component
#20
Jihwan Myung, Christoph Schmal, Sungho Hong, Yoshiaki Tsukizawa, Pia Rose, Yong Zhang, Michael J Holtzman, Erik De Schutter, Hanspeter Herzel, Grigory Bordyugov, Toru Takumi
Mammalian circadian clocks have a hierarchical organization, governed by the suprachiasmatic nucleus (SCN) in the hypothalamus. The brain itself contains multiple loci that maintain autonomous circadian rhythmicity, but the contribution of the non-SCN clocks to this hierarchy remains unclear. We examine circadian oscillations of clock gene expression in various brain loci and discovered that in mouse, robust, higher amplitude, relatively faster oscillations occur in the choroid plexus (CP) compared to the SCN...
March 14, 2018: Nature Communications
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