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We provide evidence that human sleep is a competitive arena in which cognitive domains vie for limited resources. Using pharmacology and effective connectivity analysis, we demonstrate that long-term memory and working memory are served by distinct offline neural mechanisms that are mutually antagonistic. Specifically, we administered zolpidem to increase central sigma activity and demonstrated targeted suppression of autonomic vagal activity. With effective connectivity, we determined the central activity has greater causal influence over autonomic activity, and the magnitude of this influence during sleep produced a behavioral trade-off between offline long-term and working memory processing. These findings suggest a sleep switch mechanism that toggles between central sigma-dependent long-term memory and autonomic vagal-dependent working memory processing.
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Memória de Longo Prazo/fisiologia , Memória de Curto Prazo/fisiologia , Sono/fisiologia , Adulto , Sistema Nervoso Autônomo/efeitos dos fármacos , Sistema Nervoso Autônomo/fisiologia , Córtex Cerebral/efeitos dos fármacos , Córtex Cerebral/fisiologia , Feminino , Hipocampo/efeitos dos fármacos , Hipocampo/fisiologia , Humanos , Masculino , Consolidação da Memória/efeitos dos fármacos , Consolidação da Memória/fisiologia , Memória de Longo Prazo/efeitos dos fármacos , Memória de Curto Prazo/efeitos dos fármacos , Modelos Neurológicos , Vias Neurais , Sono/efeitos dos fármacos , Fases do Sono/efeitos dos fármacos , Fases do Sono/fisiologia , Zolpidem/farmacologiaRESUMO
Age and sex are two of the three major risk factors for Alzheimer's disease (ApoE-e4 allele is the third), with women having a twofold greater risk for Alzheimer's disease after the age of 75â¯years. Sex differences have been shown across a wide range of cognitive skills in young and older adults, and evidence supports a role for sex steroids, especially estradiol, in protecting against the development of cognitive decline in women. Sleep may also be a protective factor against age-related cognitive decline, since specific electrophysiological sleep events (e.g. sleep spindle/slow oscillation coupling) are critical for offline memory consolidation. Furthermore, studies in young women have shown fluctuations in sleep events and sleep-dependent memory consolidation during different phases of the menstrual cycle that are associated with the levels of sex steroids. An under-appreciated possibility is that there may be an important interaction between these two protective factors (sex steroids and sleep) that may play a role in daily fluctuations in cognitive processing, in particular memory, across a woman's lifespan. Here, we summarize the current knowledge of sex steroid-dependent influences on sleep and cognition across the lifespan in women, with special emphasis on sleep-dependent memory processing. We further indicate gaps in knowledge that require further experimental examination in order to fully appreciate the complex and changing landscape of sex steroids and cognition. Lastly, we propose a series of testable predictions for how sex steroids impact sleep events and sleep-dependent cognition across the three major reproductive stages in women (reproductive years, menopause transition, and post-menopause).
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Envelhecimento/fisiologia , Hormônios Esteroides Gonadais/fisiologia , Consolidação da Memória/fisiologia , Menopausa/fisiologia , Ciclo Menstrual/fisiologia , Sono/fisiologia , Envelhecimento/metabolismo , Feminino , Hormônios Esteroides Gonadais/metabolismo , Humanos , Menopausa/metabolismo , Ciclo Menstrual/metabolismoRESUMO
More than 2 million people in the United States have myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). We performed targeted, broad-spectrum metabolomics to gain insights into the biology of CFS. We studied a total of 84 subjects using these methods. Forty-five subjects (n = 22 men and 23 women) met diagnostic criteria for ME/CFS by Institute of Medicine, Canadian, and Fukuda criteria. Thirty-nine subjects (n = 18 men and 21 women) were age- and sex-matched normal controls. Males with CFS were 53 (±2.8) y old (mean ± SEM; range, 21-67 y). Females were 52 (±2.5) y old (range, 20-67 y). The Karnofsky performance scores were 62 (±3.2) for males and 54 (±3.3) for females. We targeted 612 metabolites in plasma from 63 biochemical pathways by hydrophilic interaction liquid chromatography, electrospray ionization, and tandem mass spectrometry in a single-injection method. Patients with CFS showed abnormalities in 20 metabolic pathways. Eighty percent of the diagnostic metabolites were decreased, consistent with a hypometabolic syndrome. Pathway abnormalities included sphingolipid, phospholipid, purine, cholesterol, microbiome, pyrroline-5-carboxylate, riboflavin, branch chain amino acid, peroxisomal, and mitochondrial metabolism. Area under the receiver operator characteristic curve analysis showed diagnostic accuracies of 94% [95% confidence interval (CI), 84-100%] in males using eight metabolites and 96% (95% CI, 86-100%) in females using 13 metabolites. Our data show that despite the heterogeneity of factors leading to CFS, the cellular metabolic response in patients was homogeneous, statistically robust, and chemically similar to the evolutionarily conserved persistence response to environmental stress known as dauer.
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Mitochondria are highly adaptable organelles that can facilitate communication between tissues to meet the energetic demands of the organism. However, the mechanisms by which mitochondria can nonautonomously relay stress signals remain poorly understood. Here we report that mitochondrial mutations in the young, preprogeroid polymerase gamma mutator (POLG) mouse produce a metabolic state of starvation. As a result, these mice exhibit signs of metabolic imbalance including thermogenic defects in brown adipose tissue (BAT). An unexpected benefit of this adaptive response is the complete resistance to diet-induced obesity when POLG mice are placed on a high-fat diet (HFD). Paradoxically, HFD further increases oxygen consumption in part by inducing thermogenesis and mitochondrial biogenesis in BAT along with enhanced expression of fibroblast growth factor 21 (FGF21). Collectively, these findings identify a mechanistic link between FGF21, a long-known marker of mitochondrial disease, and systemic metabolic adaptation in response to mitochondrial stress.
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Dieta Hiperlipídica , Fatores de Crescimento de Fibroblastos/fisiologia , Termogênese/genética , Tecido Adiposo Marrom/metabolismo , Aerobiose , Animais , Fatores de Crescimento de Fibroblastos/genética , Fatores de Crescimento de Fibroblastos/metabolismo , Masculino , Camundongos , Camundongos Mutantes , Mitocôndrias/metabolismoRESUMO
INTRODUCTION: Skeletal muscle oxidative capacity decreases and fatigability increases after spinal cord injury. Transcription factor peroxisome proliferator-activated receptor δ (PPARδ) promotes a more oxidative phenotype. METHODS: We asked whether PPARδ overexpression could ameliorate these deficits in the medial gastrocnemius of spinal cord transected (ST) adult mice. RESULTS: Time-to-peak tension and half-relaxation times were longer in PPARδ-Con and PPARδ-ST compared with littermate wild-type (WT) controls. Fatigue index was 50% higher in PPARδ-Con than WT-Con and 70% higher in the PPARδ-ST than WT-ST. There was an overall higher percent of darkly stained fibers for succinate dehydrogenase in both PPARδ groups. CONCLUSIONS: The results indicate a conversion toward slower, more oxidative, and less fatigable muscle properties with overexpression of PPARδ. Importantly, the elevated fatigue resistance was maintained after ST, suggesting that enhanced PPARδ expression, and possibly small molecule agonists, could ameliorate the increased fatigability routinely observed in chronically paralyzed muscles.
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Músculo Esquelético/fisiopatologia , PPAR alfa/metabolismo , Traumatismos da Medula Espinal/patologia , Traumatismos da Medula Espinal/fisiopatologia , Animais , Peso Corporal/genética , Modelos Animais de Doenças , Feminino , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Fadiga Muscular/genética , Músculo Esquelético/metabolismo , Músculo Esquelético/patologia , Cadeias Pesadas de Miosina/metabolismo , Tamanho do Órgão/genética , PPAR alfa/genética , RNA Mensageiro/metabolismo , Estatísticas não Paramétricas , Succinato Desidrogenase/metabolismoRESUMO
Congenital anomalies of the kidney and urinary tract (CAKUTs) are common disorders of human development affecting the renal parechyma, renal pelvis, ureter, bladder and urethra; they show evidence of shared genetic aetiology, although the molecular basis of this remains unknown in the majority of cases. Breakpoint mapping of a de novo, apparently balanced, reciprocal translocation associated with bilateral renal agenesis has implicated the gene encoding the nuclear steroid hormone receptor ESRRG as a candidate gene for CAKUT. Here we show that the Esrrg protein is detected throughout early ureteric ducts as cytoplasmic/sub-membranous staining; with nuclear localization seen in developing nephrons. In 14.5-16.5 dpc (days post-conception) mouse embryos, Esrrg localizes to the subset of ductal tissue within the kidney, liver and lung. The renal ductal expression becomes localized to renal papilla by 18.5 dpc. Perturbation of function was performed in embryonic mouse kidney culture using pooled siRNA to induce knock-down and a specific small-molecule agonist to induce aberrant activation of Esrrg. Both resulted in severe abnormality of early branching events of the ureteric duct. Mouse embryos with a targeted inactivation of Esrrg on both alleles (Esrrg(-/-)) showed agenesis of the renal papilla but normal development of the cortex and remaining medulla. Taken together, these results suggest that Esrrg is required for early branching events of the ureteric duct that occur prior to the onset of nephrogenesis. These findings confirm ESRRG as a strong candidate gene for CAKUT.
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Medula Renal/embriologia , Receptores de Estrogênio/metabolismo , Ureter/embriologia , Ureter/metabolismo , Animais , Anormalidades Congênitas/embriologia , Anormalidades Congênitas/genética , Anormalidades Congênitas/metabolismo , Regulação da Expressão Gênica no Desenvolvimento , Humanos , Rim/anormalidades , Rim/embriologia , Rim/metabolismo , Nefropatias/congênito , Medula Renal/metabolismo , Camundongos , Camundongos Knockout , Organogênese , Receptores de Estrogênio/genéticaRESUMO
Orphan nuclear receptor ERRalpha (NR3B1) is recognized as a key regulator of mitochondrial biogenesis, but it is not known whether ERRalpha and other ERR isoforms play a broader role in cardiac energetics and function. We used genome-wide location analysis and expression profiling to appraise the role of ERRalpha and gamma (NR3B3) in the adult heart. Our data indicate that the two receptors, acting as nonobligatory heterodimers, target a common set of promoters involved in the uptake of energy substrates, production and transport of ATP across the mitochondrial membranes, and intracellular fuel sensing, as well as Ca(2+) handling and contractile work. Motif-finding algorithms assisted by functional studies indicated that ERR target promoters are enriched for NRF-1, CREB, and STAT3 binding sites. Our study thus reveals that the ERRs orchestrate a comprehensive cardiac transcriptional program and further suggests that modulation of ERR activities could be used to manage cardiomyopathies.
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Regulação da Expressão Gênica , Genoma/genética , Coração/fisiologia , Regiões Promotoras Genéticas/fisiologia , Receptores Citoplasmáticos e Nucleares/metabolismo , Receptores de Estrogênio/metabolismo , Animais , Imunoprecipitação da Cromatina , Proteína de Ligação ao Elemento de Resposta ao AMP Cíclico/metabolismo , Perfilação da Expressão Gênica , Masculino , Camundongos , Camundongos Knockout , Fator 1 Relacionado a NF-E2/metabolismo , Regiões Promotoras Genéticas/genética , Fator de Transcrição STAT3/metabolismo , Receptor ERRalfa Relacionado ao EstrogênioRESUMO
At birth, the heart undergoes a critical metabolic switch from a predominant dependence on carbohydrates during fetal life to a greater dependence on postnatal oxidative metabolism. This remains the principle metabolic state throughout life, although pathologic conditions such as heart failure and cardiac hypertrophy reactivate components of the fetal genetic program to increase carbohydrate utilization. Disruption of the ERRgamma gene (Esrrg), which is expressed at high levels in the fetal and postnatal mouse heart, blocks this switch, resulting in lactatemia, electrocardiographic abnormalities, and death during the first week of life. Genomic ChIP-on-chip and expression analysis identifies ERRgamma as both a direct and an indirect regulator of a nuclear-encoded mitochondrial genetic network that coordinates the postnatal metabolic transition. These findings reveal an unexpected and essential molecular genetic component of the oxidative metabolic gene program in the heart and highlight ERRgamma in the study of cardiac hypertrophy and failure.
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Cardiomegalia/metabolismo , Transporte de Elétrons/fisiologia , Metabolismo Energético/fisiologia , Regulação da Expressão Gênica no Desenvolvimento/fisiologia , Genes Mitocondriais/fisiologia , Coração/embriologia , Receptores Citoplasmáticos e Nucleares/fisiologia , Receptores de Estrogênio/fisiologia , Animais , Cardiomegalia/patologia , Imunoprecipitação da Cromatina , Eletrocardiografia , Feminino , Perfilação da Expressão Gênica , Coração/fisiopatologia , Lactatos/sangue , Masculino , Camundongos , Camundongos Knockout , Miócitos Cardíacos , Análise de Sequência com Séries de Oligonucleotídeos , Técnicas de Patch-Clamp , Sódio/metabolismo , Função VentricularRESUMO
Lipid metabolism is a continuum from emulsification and uptake of lipids in the intestine to cellular uptake and transport to compartments such as mitochondria. Whether fats are shuttled into lipid droplets in adipose tissue or oxidized in mitochondria and peroxisomes depends on metabolic substrate availability, energy balance and endocrine signaling of the organism. Several members of the nuclear hormone receptor superfamily are lipid-sensing factors that affect all aspects of lipid metabolism. The physiologic actions of glandular hormones (e.g. thyroid, mineralocorticoid and glucocorticoid), vitamins (e.g. vitamins A and D) and reproductive hormones (e.g. progesterone, estrogen and testosterone) and their cognate receptors are well established. The peroxisome-proliferator activated receptors (PPARs) and liver X receptors (LXRs), acting in concert with PPARgamma Coactivator 1alpha (PGC-1alpha), have been shown to regulate insulin sensitivity and lipid handling. These receptors are the focus of intense pharmacologic studies to expand the armamentarium of small molecule ligands to treat diabetes and the metabolic syndrome (hypertension, insulin resistance, hyperglycemia, dyslipidemia and obesity). Recently, additional partners of PGC-1alpha have moved to the forefront of metabolic research, the estrogen-related receptors (ERRs). Although no endogenous ligands for these receptors have been identified, phenotypic analyses of knockout mouse models demonstrate an important role for these molecules in substrate sensing and handling as well as mitochondrial function.
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Metabolismo dos Lipídeos , Mitocôndrias/metabolismo , Receptores Citoplasmáticos e Nucleares/fisiologia , Animais , Proteínas de Ligação a DNA/fisiologia , Regulação da Expressão Gênica , Proteínas de Choque Térmico/fisiologia , Humanos , Receptores X do Fígado , Síndrome Metabólica/fisiopatologia , Obesidade/fisiopatologia , Receptores Nucleares Órfãos , PPAR alfa/fisiologia , PPAR delta/fisiologia , PPAR gama/fisiologia , Coativador 1-alfa do Receptor gama Ativado por Proliferador de Peroxissomo , Receptores de Superfície Celular/fisiologia , Receptores Citoplasmáticos e Nucleares/metabolismo , Receptores de Estrogênio/fisiologia , Receptores X de Retinoides/fisiologia , Fatores de Transcrição/fisiologia , Receptor ERRalfa Relacionado ao EstrogênioRESUMO
OBJECTIVE: No drug is yet approved to treat the core symptoms of autism spectrum disorder (ASD). Low-dose suramin was effective in the maternal immune activation and Fragile X mouse models of ASD. The Suramin Autism Treatment-1 (SAT-1) trial was a double-blind, placebo-controlled, translational pilot study to examine the safety and activity of low-dose suramin in children with ASD. METHODS: Ten male subjects with ASD, ages 5-14 years, were matched by age, IQ, and autism severity into five pairs, then randomized to receive a single, intravenous infusion of suramin (20 mg/kg) or saline. The primary outcomes were ADOS-2 comparison scores and Expressive One-Word Picture Vocabulary Test (EOWPVT). Secondary outcomes were the aberrant behavior checklist, autism treatment evaluation checklist, repetitive behavior questionnaire, and clinical global impression questionnaire. RESULTS: Blood levels of suramin were 12 ± 1.5 µmol/L (mean ± SD) at 2 days and 1.5 ± 0.5 µmol/L after 6 weeks. The terminal half-life was 14.7 ± 0.7 days. A self-limited, asymptomatic rash was seen, but there were no serious adverse events. ADOS-2 comparison scores improved by -1.6 ± 0.55 points (n = 5; 95% CI = -2.3 to -0.9; Cohen's d = 2.9; P = 0.0028) in the suramin group and did not change in the placebo group. EOWPVT scores did not change. Secondary outcomes also showed improvements in language, social interaction, and decreased restricted or repetitive behaviors. INTERPRETATION: The safety and activity of low-dose suramin showed promise as a novel approach to treatment of ASD in this small study.
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Macrophage activation is an essential cellular process underlying innate immunity, enabling the body to combat bacteria and other pathogens. In addition to host defense, activated macrophages play a central role in atherogenesis, autoimmunity, and a variety of inflammatory diseases. As members of the Nuclear Receptor Signaling Atlas (NURSA) program, we employed quantitative real-time PCR (qPCR) to provide a comprehensive assessment of changes in expression of the 49 members of the murine nuclear receptor superfamily. In this study, we have identified a network of 28 nuclear receptors associated with the activation of bone marrow-derived macrophages by lipopolysaccharide or the prototypic cytokine interferon gamma. More than half of this network is deployed in three intricate and highly scripted temporal phases that are unique for each activator. Thus, early receptors whose expression peaks within 4 h after lipopolysaccharide exposure, such as glucocorticoid receptor, peroxisome proliferator-activated receptor gamma, and neuronal growth factor 1B, are found as late rising markers of the interferon gamma cascade, occurring 16 h or later. The discovery of precise serial expression patterns reveals that macrophage activation is the product of an underlying process that impacts the genome within minutes and identifies a collection of new therapeutic targets for controlling inflammation by disruption of presumptive regulatory cascades.
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Ativação de Macrófagos , Receptores Citoplasmáticos e Nucleares/imunologia , Animais , Bases de Dados de Proteínas , Perfilação da Expressão Gênica , Técnicas In Vitro , Mediadores da Inflamação/metabolismo , Interferon gama/farmacologia , Lipopolissacarídeos/farmacologia , Ativação de Macrófagos/efeitos dos fármacos , Macrófagos/efeitos dos fármacos , Macrófagos/imunologia , Macrófagos/fisiologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Reação em Cadeia da Polimerase , Receptores Citoplasmáticos e Nucleares/genética , Proteínas Recombinantes , Transdução de SinaisRESUMO
The spinal cord of vertebrate animals is comprised of intrinsic circuits that are capable of sensing the environment and generating complex motor behaviors. There are two major perspectives for understanding the biology of this complicated structure. The first approaches the spinal cord from the point of view of function and is based on classic and ongoing research in electrophysiology, adult behavior, and spinal cord injury. The second view considers the spinal cord from a developmental perspective and is founded mostly on gene expression and gain-of-function and loss-of-function genetic experiments. Together these studies have uncovered functional classes of neurons and their lineage relationships. In this review, we summarize our knowledge of developmental classes, with an eye toward understanding the functional roles of each group.
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BACKGROUND: This study was designed to test a new approach to drug treatment of autism spectrum disorders (ASDs) in the Fragile X (Fmr1) knockout mouse model. METHODS: We used behavioral analysis, mass spectrometry, metabolomics, electron microscopy, and western analysis to test the hypothesis that the disturbances in social behavior, novelty preference, metabolism, and synapse structure are treatable with antipurinergic therapy (APT). RESULTS: Weekly treatment with the purinergic antagonist suramin (20 mg/kg intraperitoneally), started at 9 weeks of age, restored normal social behavior, and improved metabolism, and brain synaptosomal structure. Abnormalities in synaptosomal glutamate, endocannabinoid, purinergic, and IP3 receptor expression, complement C1q, TDP43, and amyloid ß precursor protein (APP) were corrected. Comprehensive metabolomic analysis identified 20 biochemical pathways associated with symptom improvements. Seventeen pathways were shared with human ASD, and 11 were shared with the maternal immune activation (MIA) model of ASD. These metabolic pathways were previously identified as functionally related mediators of the evolutionarily conserved cell danger response (CDR). CONCLUSIONS: The data show that antipurinergic therapy improves the multisystem, ASD-like features of both the environmental MIA, and the genetic Fragile X models. These abnormalities appeared to be traceable to mitochondria and regulated by purinergic signaling.
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The coordination of multi-muscle movements originates in the circuitry that regulates the firing patterns of spinal motorneurons. Sensory neurons rely on the musculotopic organization of motorneurons to establish orderly connections, prompting us to examine whether the intraspinal circuitry that coordinates motor activity likewise uses cell position as an internal wiring reference. We generated a motorneuron-specific GCaMP6f mouse line and employed two-photon imaging to monitor the activity of lumbar motorneurons. We show that the central pattern generator neural network coordinately drives rhythmic columnar-specific motorneuron bursts at distinct phases of the locomotor cycle. Using multiple genetic strategies to perturb the subtype identity and orderly position of motorneurons, we found that neurons retained their rhythmic activity-but cell position was decoupled from the normal phasing pattern underlying flexion and extension. These findings suggest a hierarchical basis of motor circuit formation that relies on increasingly stringent matching of neuronal identity and position.
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Geradores de Padrão Central/fisiologia , Locomoção/fisiologia , Neurônios Motores/fisiologia , Rede Nervosa/fisiologia , Medula Espinal/citologia , Potenciais de Ação/fisiologia , Animais , Animais Recém-Nascidos , Cálcio/metabolismo , Geradores de Padrão Central/citologia , Eletromiografia , Embrião de Mamíferos , Proteínas de Homeodomínio/metabolismo , Técnicas In Vitro , Proteínas Luminescentes/genética , Proteínas Luminescentes/metabolismo , Camundongos , Camundongos Transgênicos , Periodicidade , Estatísticas não Paramétricas , Fatores de Transcrição/metabolismoRESUMO
Dopamine-deficient (DD) mice become hypophagic and die of starvation by 3 to 4 weeks of age unless dopamine is restored by daily treatment with l-3-4-dihydroxyphenylalanine (l-dopa). We demonstrate here that DD mice mount qualitatively normal counter-regulatory blood glucose responses to insulin and 2-deoxy-d-glucose (2-DG). However, unlike control mice, DD mice fail to eat in response to acute glucoprivation induced by insulin or 2-DG. They also have a severely blunted response to central administration of peptide YY (PYY). Viral-mediated restoration of dopamine synthesis to the central caudate putamen (CPu) of DD mice rescues feeding and survival. However, this treatment fails to restore insulin- and 2-DG-induced feeding despite normalizing feeding in response to food deprivation and PYY. Since dopamine signaling in the CPu is not sufficient for glucoprivation-induced feeding, we propose that this feeding behavior may be mediated by dopamine in an anatomically distinct brain region.
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Dopamina/fisiologia , Ingestão de Alimentos/fisiologia , Comportamento Alimentar/fisiologia , Adenoviridae/fisiologia , Análise de Variância , Animais , Antimetabólitos/farmacologia , Comportamento Animal , Glicemia/metabolismo , Desoxiglucose/farmacologia , Dopaminérgicos/farmacologia , Dopamina beta-Hidroxilase/deficiência , Dopamina beta-Hidroxilase/genética , Interações Medicamentosas , Ingestão de Alimentos/efeitos dos fármacos , Comportamento Alimentar/efeitos dos fármacos , Privação de Alimentos , Vetores Genéticos , Hipoglicemiantes/farmacologia , Insulina/farmacologia , Levodopa/farmacologia , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Knockout , Peptídeo YY/farmacologia , Sincalida/administração & dosagem , Fatores de Tempo , Transdução Genética , Tirosina 3-Mono-Oxigenase/deficiência , Tirosina 3-Mono-Oxigenase/genéticaRESUMO
It is well documented that the quality and quantity of prior sleep influence future sleep. For instance, nocturnal sleep restriction leads to an increase in slow wave sleep (SWS) (i.e. SWS rebound) during a subsequent sleep period. However, few studies have examined how prior napping affects daytime sleep architecture. Because daytime naps are recommended for management of disrupted sleep, understanding the impact of napping on subsequent sleep may be important. We monitored sleep-wake patterns for one week with actigraphy followed by a 75-minute polysomnographically-recorded nap. We found that greater nap frequency was correlated with increased Stage 1 and decreased SWS. We categorized subjects based on nap frequency during the prior week (0 nap, 1 to 2 naps, and 3 to 4 naps) and found differences in Stage 1, Stage 2, and SWS between groups. Subjects who took no naps had the greatest amount of SWS, those who took 1 to 2 naps had the most Stage 2 sleep, and those who took 3 to 4 naps had the most Stage 1. While correlations were not found between nap frequency and nocturnal sleep measures, frequent napping was associated with increased subjective sleepiness. Therefore, frequent napping appears to be associated with lighter daytime sleep and increased sleepiness during the day. Speculatively, low levels of daytime sleepiness and increased SWS in non-nappers may help explain why these individuals choose not to nap.
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Ritmo Circadiano/fisiologia , Fases do Sono/fisiologia , Vigília/fisiologia , Actigrafia , Adolescente , Adulto , Análise de Variância , Feminino , Humanos , Masculino , Atividade Motora/fisiologia , Polissonografia , Estatística como Assunto , Adulto JovemRESUMO
How type I skeletal muscle inherently maintains high oxidative and vascular capacity in the absence of exercise is unclear. We show that nuclear receptor ERRγ is highly expressed in type I muscle and, when transgenically expressed in anaerobic type II muscles (ERRGO mice), dually induces metabolic and vascular transformation in the absence of exercise. ERRGO mice show increased expression of genes promoting fat metabolism, mitochondrial respiration, and type I fiber specification. Muscles in ERRGO mice also display an activated angiogenic program marked by myofibrillar induction and secretion of proangiogenic factors, neovascularization, and a 100% increase in running endurance. Surprisingly, the induction of type I muscle properties by ERRγ does not involve PGC-1α. Instead, ERRγ genetically activates the energy sensor AMPK in mediating the metabovascular changes in ERRGO mice. Therefore, ERRγ represents a previously unrecognized determinant that specifies intrinsic vascular and oxidative metabolic features that distinguish type I from type II muscle.
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Músculo Esquelético/metabolismo , Receptores de Estrogênio/metabolismo , Transativadores/metabolismo , Quinases Proteína-Quinases Ativadas por AMP , Animais , Metabolismo dos Lipídeos/genética , Camundongos , Camundongos Transgênicos , Músculo Esquelético/irrigação sanguínea , Músculo Esquelético/fisiologia , Neovascularização Fisiológica , Coativador 1-alfa do Receptor gama Ativado por Proliferador de Peroxissomo , Condicionamento Físico Animal , Proteínas Quinases/metabolismo , Fatores de TranscriçãoRESUMO
We review an objective and automated method for analyzing locomotor electrophysiology data with improved speed and accuracy. Manipulating central pattern generator (CPG) organization via mouse genetics has been a critical advance in the study of this circuit. Better quantitative measures of the locomotor data will further enhance our understanding of CPG development and function. Current analysis methods aim to measure locomotor cycle period, rhythmicity, and left-right and flexor-extensor phase; however, these methods have not been optimized to detect or quantify subtle changes in locomotor output. Because multiple experiments suggest that development of the CPG is robust and that the circuit is able to achieve organized behavior by several means, we sought to find a more objective and sensitive method for quantifying locomotor output. Recently, a continuous wavelet transform (CWT) has been applied to spinal cord ventral root recordings with promising results. The CWT provides greater resolution of cycle period, phase, and rhythmicity, and is proving to be a superior technique in assessing subtle changes in locomotion due to genetic perturbations of the underlying circuitry.