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Carlos K B Ferrari, Eduardo L França, Luciane A Monteiro, Bruno L Santos, Alfredo Pereira-Junior, Adenilda C Honorio-França
OBJECTIVES: To investigate the chronopharmacological effects of growth hormone on executive function and the oxidative stress response in rats. MATERIALS AND METHODS: Fifty male Wistar rats (36-40 weeks old) had ad libitum access to water and food and were separated into four groups: diurnal control, nocturnal control, diurnal GH-treated, and nocturnal GH-treated animals. Levels of Cu, Zn superoxide dismutase (Cu, Zn-SOD), and superoxide release by spleen macrophages were evaluated...
January 2017: Iranian Journal of Basic Medical Sciences
Robert Dallmann, Alper Okyar, Francis Lévi
Daily rhythms in physiology significantly modulate drug pharmacokinetics and pharmacodynamics according to the time-of-day, a finding that has led to the concept of chronopharmacology. The importance of biological clocks for xenobiotic metabolism has gained increased attention with the discovery of the molecular circadian clockwork. Mechanistic understanding of the cell-autonomous molecular circadian oscillator and the circadian timing system as a whole has opened new conceptual and methodological lines of investigation to understand first, the clock's impact on a specific drug's daily variations or the effects/side effects of environmental substances, and second, how clock-controlled pathways are coordinated within a given tissue or organism...
May 2016: Trends in Molecular Medicine
Wilhelmus H I M Drinkenburg, Abdallah Ahnaou, Gé S F Ruigt
Current research on the effects of pharmacological agents on human neurophysiology finds its roots in animal research, which is also reflected in contemporary animal pharmaco-electroencephalography (p-EEG) applications. The contributions, present value and translational appreciation of animal p-EEG-based applications are strongly interlinked with progress in recording and neuroscience analysis methodology. After the pioneering years in the late 19th and early 20th century, animal p-EEG research flourished in the pharmaceutical industry in the early 1980s...
2015: Neuropsychobiology
Akio Fujimura
Blunted blood pressure (BP) decline during night-time leads to the higher risk of cardiovascular events in hypertensive patients. Therefore, to improve the prognosis of the patients, it is essential for properly controlling BP during night-time sleep as well as day-time activity. In addition, the dosing-time dependent changes are observed in the pharmacokinetics and pharmacodynamics of some antihypertensive drugs. Thus, the efficacy and toxicity of drugs might be affected by their dosing-time. Chronotherapy is the therapeutic application of chronopharmacology and chronotoxicology to enhance the effectiveness and tolerance of drugs by determining optical dosing-time of drugs from a circadian perspective...
November 2015: Nihon Rinsho. Japanese Journal of Clinical Medicine
Isaac K Sundar, Hongwei Yao, Michael T Sellix, Irfan Rahman
Disrupted daily or circadian rhythms of lung function and inflammatory responses are common features of chronic airway diseases. At the molecular level these circadian rhythms depend on the activity of an autoregulatory feedback loop oscillator of clock gene transcription factors, including the BMAL1:CLOCK activator complex and the repressors PERIOD and CRYPTOCHROME. The key nuclear receptors and transcription factors REV-ERBα and RORα regulate Bmal1 expression and provide stability to the oscillator. Circadian clock dysfunction is implicated in both immune and inflammatory responses to environmental, inflammatory, and infectious agents...
November 15, 2015: American Journal of Physiology. Lung Cellular and Molecular Physiology
K L Ode, H R Ueda
Recent advances in methods for making mammalian organs translucent have made possible whole-body fluorescent imaging with single-cell resolution. Because organ-clearing methods can be used to image the heterogeneous nature of cell populations, they are powerful tools to investigate the hierarchical organization of the cellular circadian clock, and how the clock synchronizes a variety of physiological activities. In particular, methods compatible with genetically encoded fluorescent reporters have the potential to detect circadian activity in different brain regions and the circadian-phase distribution across the whole body...
September 2015: Diabetes, Obesity & Metabolism
Sandrine Dulong, Annabelle Ballesta, Alper Okyar, Francis Lévi
Cancer chronotherapy aims at enhancing tolerability and efficacy of anticancer drugs through their delivery according to circadian clocks. However, mouse and patient data show that lifestyle, sex, genetics, drugs, and cancer can modify both host circadian clocks and metabolism pathways dynamics, and thus the optimal timing of drug administration. The mathematical modeling of chronopharmacology could indeed help moderate optimal timing according to patient-specific determinants. Here, we combine in vitro and in silico methods, in order to characterize the critical molecular pathways that drive the chronopharmacology of irinotecan, a topoisomerase I inhibitor with complex metabolism and known activity against colorectal cancer...
September 2015: Molecular Cancer Therapeutics
Diego A Golombek, Seithikurippu R Pandi-Perumal, Gregory M Brown, Daniel P Cardinali
The last decade has witnessed the emergence of new chronopharmacological perspectives. In the case of sleep disorders, the accumulating evidence suggests that even a minor dysfunction in the biological clock can impact broadly upon body physiology causing increases in sleep onset latency, phase delays or advances in sleep initiation, frequent nocturnal awakenings, reduced sleep efficiency, delayed and shortened rapid eye movement sleep and increased periodic leg movements, among others. Thus, restoration of the adequate circadian pattern of proper sleep hygiene, targeted exposure to light and the use of chronobiotic drugs, such as melatonin, which affect the output phase of clock-controlled circadian rhythms, can help to recover the sleep-wake cycle...
September 5, 2015: European Journal of Pharmacology
Isaac K Sundar, Hongwei Yao, Michael T Sellix, Irfan Rahman
Airway diseases are associated with abnormal circadian rhythms of lung function, reflected in daily changes of airway caliber, airway resistance, respiratory symptoms, and abnormal immune-inflammatory responses. Circadian rhythms are generated at the cellular level by an autoregulatory feedback loop of interlocked transcription factors collectively referred to as clock genes. The molecular clock is altered by cigarette smoke, LPS, and bacterial and viral infections in mouse and human lungs and in patients with chronic airway diseases...
September 2015: American Journal of Respiratory Cell and Molecular Biology
A V Popov, S S Naumov, É B Arushanian
Inflammatory arthritis is accompanied by disorganization of the circadian rhythm of locomotion in rats. Control saline injections increased the rhythm disturbances. Chronic administration of melatonin (5 mg/kg) attenuated these chronopathological shifts. Diclofenac demonstrated much lower positive chronopharmacological activity than did melatonin.
2014: Eksperimental'naia i Klinicheskaia Farmakologiia
Perumal Subramanian, Murugesan Jayakumar, Jaime Jacqueline Jayapalan, Onn Haji Hashim
BACKGROUND: Elevated blood ammonia leads to hyperammonaemia that affects vital central nervous system (CNS) functions. Fisetin, a naturally occurring flavonoid, exhibits therapeutic benefits, such as anti-cancer, anti-diabetic, anti-oxidant, anti-angiogenic, neuroprotective and neurotrophic effects. METHODS: In this study, the chronotherapeutic effect of fisetin on ammonium chloride (AC)-induced hyperammonaemic rats was investigated, to ascertain the time point at which the maximum drug effect is achieved...
December 2014: Pharmacological Reports: PR
Madeleine M Grigg-Damberger, Frank Ralls
PURPOSE OF REVIEW: To summarize recent studies on the complex relationships between sleep disorders, sleep, and epilepsy. RECENT FINDINGS: Insomnia in adults with epilepsy (AWE) warrants consideration of depression, anxiety, and suicidal ideation. Daytime sleepiness in AWE is more often due to undiagnosed sleep disorders. Sleep deprivation is an important provoker of seizures in juvenile myoclonic epilepsy. Abnormalities in frontal lobe executive function with difficulties making advantageous decisions may explain failure of juvenile myoclonic epilepsy patients to adhere to treatment recommendations and regulate their sleep habits...
November 2014: Current Opinion in Pulmonary Medicine
Sushil Sharma
Efficient drug delivery systems are exceedingly important for novel drug discovery. The evidence-based personalized medicine (EBPM) promises to deliver the right drug at the right time to a right patient as it covers clinicallysignificant genetic predisposition and chronopharmacological aspects of nanotheranostics. Recently nanotechnology has provided clinically-significant information at the cellular, molecular, and genetic level to facilitate evidence-based personalized treatment. Particularly drug encapsulation in pegylated liposomes has improved pharmacodynamics of cancer, cardiovascular diseases, and neurodegenerative diseases...
2014: Current Drug Targets
Peipei Wang, Fengmei An, Xingjun Zhuang, Jiao Liu, Liyan Zhao, Bin Zhang, Liang Liu, Pingping Lin, Mingchun Li
The epidermal growth factor receptor (EGFR), a ubiquitously expressed receptor tyrosine kinase, is recognized as a key mediator of tumorigenesis in many human epithelial tumors. Erlotinib is tyrosine kinase inhibitor approved by FDA for use in oncology. It inhibits the intracellular phosphorylation of tyrosine kinase associated with the EGFR to restrain the development of the tumor. To investigate the antitumor effect of erlotinib at different dosing times and the underlying molecular mechanism via the PI3K/AKT pathway, we established a mouse model of Lewis lung cancer xenografts...
2014: PloS One
Pinar Erkekoglu, Terken Baydar
For many decades, researchers are aware of the importance of circadian rhythm in physiological/biochemical properties and drug metabolism. Chronopharmacology is the study of how the effects of drugs vary with biological timing and endogenous periodicities. It has been attaching substantial attention in the last years. Chronopharmacodynamics mainly deals with the biochemical and physiological effects of drugs on the body, the mechanisms of drug action, the relationship between drug concentration and effect in relation to circadian clock...
October 2012: Journal of Research in Pharmacy Practice
Pinar Erkekoglu, Terken Baydar
A rough 24-hour cycle driven endogenously in biochemical, physiological or behavioral processes is called circadian rhythm. Chronobiology is the study of biological temporal rhythms. For decades, we know that the biological rhythm and the drug metabolism are also affected from daylight and chronopharmacology became recognized by scientists in the early 1970s. Its lateral branch chronocopharmacokinetics is the study of rhythmic, predictable-in-time differences in the pharmacokinetics of drugs. Chronopharmacokinetic studies are performed at every step of the biotransformation i...
July 2012: Journal of Research in Pharmacy Practice
Katsuya Aoto, Akihiro Kanamori, Tomokazu Yoshioka, Kenta Uemura, Masataka Sakane, Masashi Yamazaki
OBJECTIVE: The influence of circadian rhythms has recently been considered in advanced studies of chronopharmacology and chronotherapeutics. Although emerging studies have reported the usefulness of platelet-rich plasma (PRP), no reports have described the diurnal variations in PRP growth factor levels. In the present study, we hypothesized that growth factor levels in PRP show a significant diurnal variation. DESIGN: Controlled laboratory study. SETTING: Institutional...
November 2014: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
Z-q Yu, C-l Zhang, Y-j Xu, M-j Chang, J-j Jin, L Luo, X-p Li, D Liu
Narcotic analgesics, especially morphine, exert significantly different effects depending on the time within one day. The objective of this study was to observe whether the dosing time of 6 narcotic analgesics in mice affected their efficacy, pain tolerance and recovery of tolerance. The chronopharmacology of these 6 narcotics was evaluated using a hot-plate model. Maximum possible effect (MPE) of morphine showed a significant 24 h rhythm, which was higher during the dark phase and lower during the light phase (P<0...
March 2015: Drug Research
José Manuel Costa-Martins, Marco Pereira, Henriqueta Martins, Mariana Moura-Ramos, Rui Coelho, Jorge Tavares
Circadian variation in biological rhythms has been identified as affecting both labour pain and the pharmacological properties of analgesics. In the context of pain, there is also a growing body of evidence suggesting the importance of adult attachment. The purpose of this study was to examine whether labour pain, analgesic consumption and pharmacological effect are significantly affected by the time of day and to analyse whether this circadian variation is influenced by women's attachment style. This prospective observational study included a sample of 81 pregnant women receiving patient-controlled epidural analgesia (PCEA)...
July 2014: Chronobiology International
Naoto Burioka
Bronchial asthma is characterized by recurring symptoms, chronic inflammation of airway, reversible airflow limitation, and bronchial hyperresponsiveness. Lung function and symptoms of asthmatic patients frequently worsen between midnight and early morning. Currently, new drug delivery system based on chronopharmacology has been developed for the treatment of asthma. A night-time single dosing of anti-asthmatic drugs is clinically used for chronotherapy of asthma, which contributes to improve patient's adherence...
December 2013: Nihon Rinsho. Japanese Journal of Clinical Medicine
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