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https://www.readbyqxmd.com/read/28545154/site-specific-phosphorylation-of-casein-kinase-1-%C3%AE-ck1%C3%AE-regulates-its-activity-towards-the-circadian-regulator-per2
#1
Gracie Wee Ling Eng, Edison, David M Virshup
Circadian rhythms are intrinsic ~24 hour cycles that regulate diverse aspects of physiology, and in turn are regulated by interactions with the external environment. Casein kinase 1 delta (CK1δ, CSNK1D) is a key regulator of the clock, phosphorylating both stabilizing and destabilizing sites on the PER2 protein, in a mechanism known as the phosphoswitch. CK1δ can itself be regulated by phosphorylation on its regulatory domain, but the specific sites involved, and the role this plays in control of circadian rhythms as well as other CK1-dependent processes is not well understood...
2017: PloS One
https://www.readbyqxmd.com/read/28543984/cycle-affects-imidacloprid-efficiency-by-mediating-cytochrome-p450-expression-in-the-brown-planthopper-nilaparvata-lugens
#2
K Kang, P Yang, R Pang, L Yue, W Zhang
Circadian clocks influence most behaviours and physiological activities in animals, including daily fluctuations in metabolism. However, how the clock gene cycle influences insects' responses to pesticides has rarely been reported. Here, we provide evidence that cycle affects imidacloprid efficacy by mediating the expression of cytochrome P450 genes in the brown planthopper (BPH) Nilaparvata lugens, a serious insect pest of rice. Survival bioassays showed that the susceptibility of BPH adults to imidacloprid differed significantly between the two time points tested [Zeitgeber Time 8 (ZT8) and ZT4]...
May 23, 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/28543681/activation-of-mmps-in-macrophages-by-mycobacterium-tuberculosis-via-the-mir-223-bmal1-signaling-pathway
#3
Jun Lou, Yongli Wang, Zhimin Zhang, Weiqiang Qiu
An interaction between Mycobacterium tuberculosis and macrophages constitutes an essential step in tuberculosis development, as macrophages exert both positive and negative effects on M. tuberculosis-triggered organ lesions. In this study, we focused on the regulation of the expression of matrix metalloproteinases (MMPs), which is responsible for lung matrix degradation and bacteria dissection, in macrophages following M. tuberculosis infection. Female BALB/c mice were intravenously injected with the M. tuberculosis strain H37Rv at 0h zeitgeber time (ZT0) or 12 h zeitgeber time (ZT12)...
May 19, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28542864/circadian-clustering-of-spontaneous-epileptic-seizures-emerges-after-pilocarpine-induced-status-epilepticus
#4
Julika Pitsch, Albert J Becker, Susanne Schoch, Johannes Alexander Müller, Marco de Curtis, Vadym Gnatkovsky
OBJECTIVE: Seizures in mesial temporal lobe epilepsy (MTLE) associated with hippocampal sclerosis are thought to develop with various latency intervals after an initial transient brain insult. To study seizure dynamics after an initial transient precipitating insult in a systematic fashion, we utilized continuous video-electroencephalography (EEG) monitoring after the induction of status epilepticus (SE) in a mouse MTLE model. METHODS: Continuous 24/7 video/telemetric hippocampal EEG recordings in the systemic pilocarpine MTLE mouse model...
May 24, 2017: Epilepsia
https://www.readbyqxmd.com/read/28541391/rotating-night-shift-work-and-risk-of-breast-cancer-in-the-nurses-health-studies
#5
Lani R Wegrzyn, Rulla M Tamimi, Bernard A Rosner, Susan B Brown, Richard G Stevens, A Heather Eliassen, Francine Laden, Walter C Willett, Susan E Hankinson, Eva S Schernhammer
In 2007, the International Agency for Research on Cancer declared shift work involving circadian disruption to be a "probable" carcinogen (group 2A), noting that human evidence was limited. This study examined associations between rotating night shift work and breast cancer risk in two prospective cohorts, the Nurses' Health Studies (NHS: 1988-2012, n = 78,516; NHS2: 1989-2013, n = 114,559), with 9,541 incident invasive breast malignancies and 24 years of follow-up. Women in NHS with 30+ years of shift work had no increased risk of breast cancer (Hazard ratio (HR) = 0...
May 24, 2017: American Journal of Epidemiology
https://www.readbyqxmd.com/read/28540583/circadian-rhythm-in-melatonin-release-as-a-mechanism-to-reinforce-the-temporal-organization-of-the-circadian-system-in-crayfish
#6
Leonor Mendoza-Vargas, Armida Báez-Saldaña, Ramón Alvarado, Beatriz Fuentes-Pardo, Edgar Flores-Soto, Héctor Solís-Chagoyán
Melatonin (MEL) is a conserved molecule with respect to its synthesis pathway and functions. In crayfish, MEL content in eyestalks (Ey) increases at night under the photoperiod, and this indoleamine synchronizes the circadian rhythm of electroretinogram amplitude, which is expressed by retinas and controlled by the cerebroid ganglion (CG). The aim of this study was to determine whether MEL content in eyestalks and CG or circulating MEL in hemolymph (He) follows a circadian rhythm under a free-running condition; in addition, it was tested whether MEL might directly influence the spontaneous electrical activity of the CG...
June 2017: Invertebrate Neuroscience: IN
https://www.readbyqxmd.com/read/28540509/short-term-supplementation-of-isocaloric-meals-with-l-tryptophan-affects-pig-growth
#7
H N Liu, C-A A Hu, M M Bai, Gang Liu, M C B Tossou, K Xu, F N Li, P Liao, X F Kong, X Wu, Y L Yin
L-Tryptophan (Trp) and some of its metabolites regulate the circadian rhythm in mammals. We aimed to investigate the effects of short-term supplementation of Trp in isocaloric meals on growth performance using the parameters of multiple blood biomarkers and free amino acids in growing pigs. A total of 32 Landrace × Yorkshire barrows with a mean body weight of 8.64 (±1.13) kg were randomly assigned to four groups and then fed with various concentrations of Trp diets daily. Our results showed that sequential supplementation of different concentrations of Trp in isocaloric meals decreased the feed:gain (F:G) ratio (P = 0...
May 24, 2017: Amino Acids
https://www.readbyqxmd.com/read/28539591/characterization-of-the-adult-head-transcriptome-and-identification-of-migration-and-olfaction-genes-in-the-oriental-armyworm-mythimna-separate
#8
Hai-Xu Bian, Hong-Fang Ma, Xi-Xi Zheng, Ming-Hui Peng, Yu-Ping Li, Jun-Fang Su, Huan Wang, Qun Li, Run-Xi Xia, Yan-Qun Liu, Xing-Fu Jiang
The oriental armyworm Mythimna separate is an economically important insect with a wide distribution and strong migratory activity. However, knowledge about the molecular mechanisms regulating the physiological and behavioural responses of the oriental armyworm is scarce. In the present study, we took a transcriptomic approach to characterize the gene network in the adult head of M. separate. The sequencing and de novo assembly yielded 63,499 transcripts, which were further assembled into 46,459 unigenes with an N50 of 1,153 bp...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28539174/drug-metabolism-in-the-elderly-a-multifactorial-problem
#9
REVIEW
R H Waring, R M Harris, S C Mitchell
Whether or not an individual's drug metabolising capacity declines with advancing age is a vexing question. There is no clear evidence that drug metabolism itself ('the biologically-assisted chemical alteration of the administered parent molecule') is less efficient in healthy old age than at younger ages, whereas a decreased capacity may be associated with ill-health and frailty. However, elderly individuals do show a reduced enzyme induction capability and are less able to tolerate overdoses. It appears that the majority of deleterious clinical outcomes related to drug therapy in an elderly (usually ill or frail) population may be ascribed to various anatomical and physiological age-related changes...
June 2017: Maturitas
https://www.readbyqxmd.com/read/28539147/sunlight-exposure-work-hours-caffeine-consumption-and-sleep-duration-in-the-naval-environment
#10
Nita L Shattuck, Panagiotis Matsangas
BACKGROUND: Sailors in the U.S. Navy are habitual shiftworkers, often experiencing circadian misalignment due to their irregular work/rest schedules. This study assessed the effect of sunlight exposure, work hours, and caffeinated beverage consumption on the daily sleep duration of crewmembers of a U.S. Navy ship during a 2-wk underway period. METHODS: Working in an artificially lit area with no access to sunlight during work hours, U.S. Navy crew members (N = 91) used daily logs to report their daily activity, caffeinated beverage consumption, and exposure to sunlight while off-duty; sleep was assessed by wrist-worn actigraphy...
June 1, 2017: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/28538660/regulatory-plasticity-of-earthworm-wmt-2-gene-expression
#11
Victoria Drechsel, Karl Schauer, Maja Šrut, Martina Höckner
Metallothioneins (MTs) are multifunctional proteins occurring throughout the animal kingdom. While the expression and transcriptional regulation of MTs is well-studied in vertebrates, the mechanism of MT activation is still unknown for most invertebrates. Therefore, we examined wMT-2 gene regulation and expression patterns in Lumbricus rubellus and L. terrestris. Transcription levels, the occupation of DNA binding sites, the expression of putative transcriptional regulators, and promotor DNA methylation were determined...
May 24, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28538305/comparing-performance-during-morning-vs-afternoon-training-sessions-in-intercollegiate-basketball-players
#12
Aaron D Heishman, Michael A Curtis, Ethan N Saliba, Robert J Hornett, Steven K Malin, Arthur L Weltman
Heishman, AD, Curtis, MA, Saliba, EN, Hornett, RJ, Malin, SK, and Weltman, AL. Comparing performance during morning vs. afternoon training sessions in intercollegiate basketball players. J Strength Cond Res 31(6): 1557-1562, 2017-Time of day is a key factor that influences the optimization of athletic performance. Intercollegiate coaches oftentimes hold early morning strength training sessions for a variety of factors including convenience. However, few studies have specifically investigated the effect of early morning vs...
June 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28537528/circadian-orchestration-of-insulin-and-glucagon-release
#13
Volodymyr Petrenko, Charna Dibner
No abstract text is available yet for this article.
May 24, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28536575/inflammatory-long-pentraxin-3-is-associated-with-leukocyte-telomere-length-in-night-shift-workers
#14
Sofia Pavanello, Mariarita Stendardo, Giuseppe Mastrangelo, Melissa Bonci, Barbara Bottazzi, Manuela Campisi, Marco Nardini, Roberto Leone, Alberto Mantovani, Piera Boschetto
Aging is an emerging worldwide threat to public health, even in the workplace, as it links with risk of illness and death. Bewildered inflammatory responses and stressful conditions associate with age-related disorders. Additionally, circadian rhythm disruption, a critical health issue in night-shift workers, correlates with premature aging. We investigated the hypothesis of a link between altered inflammatory response, detected by plasmatic long pentraxin 3 (PTX3), and biological aging, measured by leukocyte telomere length (LTL), attrition, and possibly induced by night-shift work...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28536247/circadian-networks-in-human-embryonic-stem-cell-derived-cardiomyocytes
#15
Pieterjan Dierickx, Marit W Vermunt, Mauro J Muraro, Menno P Creyghton, Pieter A Doevendans, Alexander van Oudenaarden, Niels Geijsen, Linda W Van Laake
Cell-autonomous circadian oscillations strongly influence tissue physiology and pathophysiology of peripheral organs including the heart, in which the circadian clock is known to determine cardiac metabolism and the outcome of for instance ischemic stress. Human pluripotent stem cells represent a powerful tool to study developmental processes in vitro, but the extent to which human embryonic stem (ES) cell-derived cardiomyocytes establish circadian rhythmicity in the absence of a systemic context is unknown...
May 23, 2017: EMBO Reports
https://www.readbyqxmd.com/read/28535270/intrinsically-photosensitive-retinal-ganglion-cell-function-sleep-efficiency-and-depression-in-advanced-age-related-macular-degeneration
#16
Michelle L Maynard, Andrew J Zele, Anthony S Kwan, Beatrix Feigl
Purpose: Melanopsin expressing intrinsically photosensitive retinal ganglion cells (ipRGC) input to multiple brain regions including those for pupil control, circadian rhythms, sleep and mood regulation. Here we measured ipRGC function and its relationship to sleep quality and depression in patients with advanced AMD. Methods: The melanopsin-mediated post-illumination pupil response (PIPR) was measured in 53 patients with advanced AMD (age 78.8 ± 8.8 years) and in 20 healthy controls (age 72...
February 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28535183/time-caloric-restriction-inhibits-the-neoplastic-transformation-of-cirrhotic-liver-in-rats-treated-with-diethylnitrosamine
#17
Christian Molina-Aguilar, María de Jesús Guerrero-Carrillo, Jesús Javier Espinosa-Aguirre, Sitlali Olguin-Reyes, Thania Castro-Belio, Olivia Vázquez-Martínez, Julieta Berenice Rivera-Zavala, Mauricio Díaz-Muñoz
Hepatocellular cancer is the most common type of primary liver cancer. Cirrhosis is the main risk factor that generates this malady. It has been proven that caloric restriction protocols and restricted feeding schedules are protective in experimental carcinogenic models. We tested the influence of a time-caloric restriction protocol (2 h of food access during the daytime for 18 weeks) in an experimental model of cirrhosis-hepatocarcinoma produced by weekly administration of diethylnitrosamine. Our results indicate that time-caloric restriction reduced hepatomegaly and prevented the increase in blood leukocytes promoted by diethylnitrosamine...
May 23, 2017: Carcinogenesis
https://www.readbyqxmd.com/read/28535015/the-circadian-clock-gene-per2-plays-an-important-role-in-tumor-suppression-through-regulating-tumor-associated-genes-in-human-oral-squamous-cell-carcinoma
#18
Xiaoli Su, Dan Chen, Kai Yang, Qin Zhao, Dan Zhao, Xiaoqiang Lv, Yiran Ao
Low expression of the clock gene PER2 is closely related to carcinogenesis and the development of cancer; however, the mechanism of the low expression of PER2 that led to cell malignant transformation remains unclear. This study used RNA interference (RNAi) technology to silence PER2 in SCC15 human oral squamous cell carcinoma (OSCC) cells. Then it was found that the ability of cancer cell proliferation, migration, and invasion were markedly increased (P<0.05), and the ability of cancer cell apoptosis and the number of cells in G1/G0 phase were markedly reduced (P<0...
May 19, 2017: Oncology Reports
https://www.readbyqxmd.com/read/28534696/light-sleep-and-circadian-rhythms-in-older-adults-with-alzheimer-s-disease-and-related-dementias
#19
Mariana G Figueiro
Alzheimer's disease and related dementias (ADRD) can cause sleep and behavioral problems that are problematic for ADRD patients and their family caregivers. Light therapy has shown promise as a nonpharmacological treatment, and preliminary studies demonstrate that timed light exposure can consolidate and improve nighttime sleep efficiency, increase daytime wakefulness and reduce evening agitation without the adverse effects of pharmacological solutions. Compliance with light treatment and the accurate measurement of light exposures during treatment, however, have presented barriers for the adoption of light therapy for ADRD...
May 23, 2017: Neurodegenerative Disease Management
https://www.readbyqxmd.com/read/28534145/alterations-in-gene-expression-after-gamma-hydroxybutyric-acid-intake-a-pilot-study
#20
Lena-Maria Mehling, Annika Spottke, Anna Heidbreder, Peter Young, Burkhard Madea, Cornelius Hess, Cornelius Courts
Gamma-hydroxybutyric acid (GHB) acts as an agonist of the GABAB receptor, where GHB induces a depressant effect in the central nervous system. Besides its therapeutic application, GHB is also used as a date rape drug. However, the detection of GHB ingestion proves to be difficult due to its narrow detection window. The aim of this pilot study was to assess differential gene expressions after GHB intake to identify potential biomarkers for the detection of GHB intake. To this aim, alteration in gene expression of ALDH5A1, AKR7A2, EREG, and PEA15 was investigated via quantitative PCR (qPCR)...
May 22, 2017: International Journal of Legal Medicine
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