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Circadian biology

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https://www.readbyqxmd.com/read/29331582/inositol-polyphosphates-contribute-to-cellular-circadian-rhythms-implications-for-understanding-lithium-s-molecular-mechanism
#1
Heather Wei, Dominic Landgraf, George Wang, Michael J McCarthy
Most living organisms maintain cell autonomous circadian clocks that synchronize critical biological functions with daily environmental cycles. In mammals, the circadian clock is regulated by inputs from signaling pathways including glycogen synthase kinase 3 (GSK3). The drug lithium has actions on GSK3, and also on inositol metabolism. While it is suspected that lithium's inhibition of GSK3 causes rhythm changes, it is not known if inositol polyphosphates can also affect the circadian clock. We examined whether the signaling molecule inositol hexaphosphate (IP6) has effects on circadian rhythms...
January 10, 2018: Cellular Signalling
https://www.readbyqxmd.com/read/29331507/adropin-an-endocrine-link-between-the-biological-clock-and-cholesterol-homeostasis
#2
Sarbani Ghoshal, Joseph R Stevens, Cyrielle Billon, Clemence Girardet, Sadichha Sitaula, Arthur S Leon, D C Rao, James S Skinner, Tuomo Rankinen, Claude Bouchard, Marinelle V Nuñez, Kimber L Stanhope, Deborah A Howatt, Alan Daugherty, Jinsong Zhang, Matthew Schuelke, Edward P Weiss, Alisha R Coffey, Brian J Bennett, Praveen Sethupathy, Thomas P Burris, Peter J Havel, Andrew A Butler
OBJECTIVE: Identify determinants of plasma adropin concentrations, a secreted peptide translated from the Energy Homeostasis Associated (ENHO) gene linked to metabolic control and vascular function. METHODS: Associations between plasma adropin concentrations, demographics (sex, age, BMI) and circulating biomarkers of lipid and glucose metabolism were assessed in plasma obtained after an overnight fast in humans. The regulation of adropin expression was then assessed in silico, in cultured human cells, and in animal models...
December 30, 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/29325176/dynamic-motif-occupancy-dynamo-analysis-identifies-transcription-factors-and-their-binding-sites-driving-dynamic-biological-processes
#3
Zheng Kuang, Zhicheng Ji, Jef D Boeke, Hongkai Ji
Biological processes are usually associated with genome-wide remodeling of transcription driven by transcription factors (TFs). Identifying key TFs and their spatiotemporal binding patterns are indispensable to understanding how dynamic processes are programmed. However, most methods are designed to predict TF binding sites only. We present a computational method, dynamic motif occupancy analysis (DynaMO), to infer important TFs and their spatiotemporal binding activities in dynamic biological processes using chromatin profiling data from multiple biological conditions such as time-course histone modification ChIP-seq data...
January 9, 2018: Nucleic Acids Research
https://www.readbyqxmd.com/read/29324752/tet-protein-function-during-drosophila-development
#4
Fei Wang, Svetlana Minakhina, Hiep Tran, Neha Changela, Joseph Kramer, Ruth Steward
The TET (Ten-eleven translocation) 1, 2 and 3 proteins have been shown to function as DNA hydroxymethylases in vertebrates and their requirements have been documented extensively. Recently, the Tet proteins have been shown to also hydroxylate 5-methylcytosine in RNA. 5-hydroxymethylcytosine (5hmrC) is enriched in messenger RNA but the function of this modification has yet to be elucidated. Because Cytosine methylation in DNA is barely detectable in Drosophila, it serves as an ideal model to study the biological function of 5hmrC...
2018: PloS One
https://www.readbyqxmd.com/read/29319388/woohwangcheongsimwon-prevents-high-fat-diet-induced-memory-deficits-and-induces-sirt1-in-mice
#5
Hyunwoo Park, Mia Kim, Im-Joon Shin, Jonghee Park, Soo Yong Bang, Chunsik Yi, Myoung-Ae Kim, Jae-Hwan Lew, Joo Won Suh, Sungho Maeng
Woohwangcheongsimwon (WHC) is a mixture of herbal medicines that is widely prescribed in Korean traditional medicine. SIRT1 is known for its regulatory roles in energy metabolism, oxidative stress, and circadian rhythms. This study was designed to determine whether WHC can increase and mimic the biological reactions of SIRT1 activation. Ten-month-old male mice were divided into four groups: nontreated normal diet (ND), nontreated high-fat diet (HFD), WHC-treated ND, and WHC-treated HFD. Body weight and cognitive functions were evaluated after treatment...
January 10, 2018: Journal of Medicinal Food
https://www.readbyqxmd.com/read/29318656/circadian-genes-and-risk-of-prostate-cancer-in-the-prostate-cancer-prevention-trial
#6
Lisa W Chu, Cathee Till, Baiyu Yang, Catherine M Tangen, Phyllis J Goodman, Kai Yu, Yong Zhu, Summer Han, Ashraful M Hoque, Christine Ambrosone, Ian Thompson, Robin Leach, Ann W Hsing
Circadian genes have been considered as a possible biological mechanism for the observed relationship between circadian rhythm disruptions and increased risk of hormone-related cancers. In the current study, we investigated the relationship between circadian gene variants and prostate cancer risk and whether reducing bioavailable testosterone modifies the circadian genes-prostate cancer relationship. We conducted a nested case-control study among Caucasian men in the Prostate Cancer Prevention Trial (PCPT), a randomized placebo-controlled clinical trial to assess if finasteride (an androgen bioactivation inhibitor) could prevent prostate cancer...
January 10, 2018: Molecular Carcinogenesis
https://www.readbyqxmd.com/read/29316898/inhibition-of-p38-mapk-activity-leads-to-cell-type-specific-effects-on-the-molecular-circadian-clock-and-time-dependent-reduction-of-glioma-cell-invasiveness
#7
Charles S Goldsmith, Sam Moon Kim, Nirmala Karunarathna, Nichole Neuendorff, L Gerard Toussaint, David J Earnest, Deborah Bell-Pedersen
BACKGROUND: The circadian clock is the basis for biological time keeping in eukaryotic organisms. The clock mechanism relies on biochemical signaling pathways to detect environmental stimuli and to regulate the expression of clock-controlled genes throughout the body. MAPK signaling pathways function in both circadian input and output pathways in mammals depending on the tissue; however, little is known about the role of p38 MAPK, an established tumor suppressor, in the mammalian circadian system...
January 10, 2018: BMC Cancer
https://www.readbyqxmd.com/read/29316442/circadian-clocks-and-upr-new-twists-as-the-story-unfolds
#8
Nikolay B Milev, David Gatfield
Circadian clocks help control the unfolded protein response (UPR). In a recent issue of Nature Cell Biology, Bu et al. (2017) show that the interaction is reciprocal, with miRNA-211 providing a signal from the UPR to the clock component BMAL1, affecting circadian timing, global translational control, and cancer cell survival.
January 8, 2018: Developmental Cell
https://www.readbyqxmd.com/read/29303978/telomere-homeostasis-interplay-with-magnesium
#9
REVIEW
Donogh Maguire, Ognian Neytchev, Dinesh Talwar, Donald McMillan, Paul G Shiels
Telomere biology, a key component of the hallmarks of ageing, offers insight into dysregulation of normative ageing processes that accompany age-related diseases such as cancer. Telomere homeostasis is tightly linked to cellular metabolism, and in particular with mitochondrial physiology, which is also diminished during cellular senescence and normative physiological ageing. Inherent in the biochemistry of these processes is the role of magnesium, one of the main cellular ions and an essential cofactor in all reactions that use ATP...
January 5, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29301134/suprachiasmatic-nucleus-and-subordinate-brain-oscillators-clock-gene-desynchronization-by-neuroinflammation
#10
Leila Maria Guissoni Campos, Rogerio Leone Buchaim, Nathani Cristina da Silva, Caio Sergio Galina Spilla, Alessandre Hataka, Luciana Pinato
OBJECTIVE: The clock genes Period (per) 1 and 2 are essential components in the generation and adjustment of biological circadian rhythms by the suprachiasmatic nucleus (SCN). Both genes are also rhythmically present in extrahypothalamic areas such as the hippocampus and cerebellum, considered subordinate oscillators. Several pathological conditions alter rhythmic biological phenomena, but the mechanisms behind these changes involving the clock genes are not well defined. The current study investigated changes in PER1 and PER2 immunoreactivity in the SCN, hippocampus, and cerebellum in a neuroinflammation model...
January 5, 2018: Neuroimmunomodulation
https://www.readbyqxmd.com/read/29300726/regulation-of-circadian-clock-transcriptional-output-by-clock-bmal1
#11
Alexandra J Trott, Jerome S Menet
The mammalian circadian clock relies on the transcription factor CLOCK:BMAL1 to coordinate the rhythmic expression of 15% of the transcriptome and control the daily regulation of biological functions. The recent characterization of CLOCK:BMAL1 cistrome revealed that although CLOCK:BMAL1 binds synchronously to all of its target genes, its transcriptional output is highly heterogeneous. By performing a meta-analysis of several independent genome-wide datasets, we found that the binding of other transcription factors at CLOCK:BMAL1 enhancers likely contribute to the heterogeneity of CLOCK:BMAL1 transcriptional output...
January 4, 2018: PLoS Genetics
https://www.readbyqxmd.com/read/29298348/computational-exploration-of-cis-regulatory-modules-in-rhythmic-expression-data-using-the-exploration-of-distinctive-cres-and-crms-edcc-and-crm-network-generator-cng-programs
#12
Pavlos Stephanos Bekiaris, Tobias Tekath, Dorothee Staiger, Selahattin Danisman
Understanding the effect of cis-regulatory elements (CRE) and clusters of CREs, which are called cis-regulatory modules (CRM), in eukaryotic gene expression is a challenge of computational biology. We developed two programs that allow simple, fast and reliable analysis of candidate CREs and CRMs that may affect specific gene expression and that determine positional features between individual CREs within a CRM. The first program, "Exploration of Distinctive CREs and CRMs" (EDCC), correlates candidate CREs and CRMs with specific gene expression patterns...
2018: PloS One
https://www.readbyqxmd.com/read/29289963/treatment-guidelines-for-circadian-rhythm-sleep-wake-disorders-of-the-polish-sleep-research-society-and-the-section-of-biological-psychiatry-of-the-polish-psychiatric-association-part-ii-diagnosis-and-treatment
#13
REVIEW
Adam Wichniak, Konrad S Jankowski, Michał Skalski, Krystyna Skwarło-Sońta, Jolanta B Zawilska, Marcin Żarowski, Ewa Poradowska, Wojciech Jernajczyk
AIM: Circadian rhythm sleep-wake disorders (CRSWD) are a group of disorders, in which the timing of sleep and wakefulness significantly differs from a patient's expectations or socially acceptable times. The aimof the article is to present the current principles for the diagnosis and treatment of CRSWD in adults and children. METHOD: Guidelines proposed as CRSWD treatment standard are based on the recommendations from the scientific societies involved in the sleep research and medicine...
October 29, 2017: Psychiatria Polska
https://www.readbyqxmd.com/read/29289962/treatment-guidelines-for-circadian-rhythm-sleep-wake-disorders-of-the-polish-sleep-research-society-and-the-section-of-biological-psychiatry-of-the-polish-psychiatric-association-part-i-physiology-assessment-and-therapeutic-methods
#14
REVIEW
Adam Wichniak, Konrad S Jankowski, Michal Skalski, Krystyna Skwarło-Sońta, Jolanta B Zawilska, Marcin Żarowski, Ewa Poradowska, Wojciech Jernajczyk
Majority of the physiological processes in the human organism are rhythmic. The most common are the diurnal changes that repeat roughly every 24 hours, called circadian rhythms. Circadian rhythms disorders have negative influence on human functioning. The aim of this article is to present the current understanding of the circadian rhythms physiological role, with particular emphasis on the circadian rhythm sleep-wake disorders (CRSWD), principles of their diagnosis and chronobiological therapy. The guidelines are based on the review of recommendations from the scientific societies involved in sleep medicine and the clinical experiences of the authors...
October 29, 2017: Psychiatria Polska
https://www.readbyqxmd.com/read/29286421/flexible-measurement-of-bioluminescent-reporters-using-an-automated-longitudinal-luciferase-imaging-gas-and-temperature-optimized-recorder-alligator
#15
Priya Crosby, Nathaniel P Hoyle, John S O'Neill
Luciferase-based reporters of cellular gene expression are in widespread use for both longitudinal and end-point assays of biological activity. In circadian rhythms research, for example, clock gene fusions with firefly luciferase give rise to robust rhythms in cellular bioluminescence that persist over many days. Technical limitations associated with photomultiplier tubes (PMT) or conventional microscopy-based methods for bioluminescence quantification have typically demanded that cells and tissues be maintained under quite non-physiological conditions during recording, with a trade-off between sensitivity and throughput...
December 13, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29282866/body-clocks-time-for-the-nobel-prize
#16
EDITORIAL
Charna Dibner, Ueli Schibler
Already in 1729 Jean-Jacques d'Ortous de Mairan, a French astronomer, noticed that the mimosa plants in his backyard opened and closed their leaves at similar times during the day. Intriguingly, these daily cycles of leaf movements persisted in plants kept in nearly constant darkness, and de Mairan thus concluded that they must be driven by endogenous clocks rather than environmental light-dark cycles. In the meantime self-sustained circadian oscillators have been found in nearly all light-sensitive organisms from cyanobacteria to mammals...
December 28, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/29282130/what-does-not-kill-it-makes-it-weaker-effects-of-sub-lethal-concentrations-of-ivermectin-on-the-locomotor-activity-of-anopheles-aquasalis
#17
Vanderson de Souza Sampaio, Gustavo Bueno da Silva Rivas, Kevin Kobylinski, Yudi Tatiana Pinilla, Paulo Filemon Paolluci Pimenta, José Bento Pereira Lima, Rafaela Vieira Bruno, Marcus Vinícius Guimarães Lacerda, Wuelton Marcelo Monteiro
BACKGROUND: Malaria remains a major public health concern. Vector control measures based solely on insecticide treated nets (ITNs) and indoor residual spraying (IRS) have demonstrated not to be feasible for malaria elimination. It has been shown that ivermectin affects several aspects of Anopheles species biology. Along the Latin American seacoast, Anopheles aquasalis Curry plays an important role in malaria transmission. The observation of mosquitoes locomotor activity under laboratory conditions can reveal details of their daily activity rhythms, which is controlled by an endogenous circadian clock that seems to be influenced by external signals, such as light and temperature...
December 28, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29277155/wnt-takes-two-to-tango-molecular-links-between-the-circadian-clock-and-the-cell-cycle-in-adult-stem-cells
#18
Toru Matsu-Ura, Sean R Moore, Christian I Hong
Like two dancers, the circadian clock and cell cycle are biological oscillators engaged in bidirectional communication, resulting in circadian clock-gated cell division cycles in species ranging from cyanobacteria to mammals. The identified mechanisms for this phenomenon have expanded beyond intracellular molecular coupling components to include intercellular connections. However, detailed molecular mechanisms, dynamics, and physiological functions of the circadian clock and cell cycle as coupled oscillators remain largely unknown...
December 1, 2017: Journal of Biological Rhythms
https://www.readbyqxmd.com/read/29273645/stratification-of-knee-osteoarthritis-two-major-patient-subgroups-identified-by-genome-wide-expression-analysis-of-articular-cartilage
#19
Jamie Soul, Sara L Dunn, Sanjay Anand, Ferdinand Serracino-Inglott, Jean-Marc Schwartz, Ray P Boot-Handford, Tim E Hardingham
INTRODUCTION: Osteoarthritis (OA) is a heterogeneous and complex disease. We have used a network biology approach based on genome-wide analysis of gene expression in OA knee cartilage to seek evidence for pathogenic mechanisms that may distinguish different patient subgroups. METHODS: Results from RNA-Sequencing (RNA-Seq) were collected from intact knee cartilage at total knee replacement from 44 patients with OA, from 16 additional patients with OA and 10 control patients with non-OA...
December 22, 2017: Annals of the Rheumatic Diseases
https://www.readbyqxmd.com/read/29260645/clock-gene-period-in-the-chagas-disease-vector-triatoma-infestans-hemiptera-reduviidae
#20
María M Stroppa, Ignacio Gimenez, Beatriz A García
To contribute to a better understanding of the molecular bases of the circadian biological rhythms in Chagas disease vectors, in this work we identified functional domains in the sequences of the clock protein PERIOD (PER) in Rhodnius prolixus and Triatoma infestans and analyzed the expression of the PER gene at mRNA level in T. infestans. The PER protein sequences comparison among these species and those from other insects revealed that the most similar regions are the PAS domains and the most variable is the COOH-terminal...
December 18, 2017: American Journal of Tropical Medicine and Hygiene
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