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https://www.readbyqxmd.com/read/29931080/effect-of-chronic-heat-stress-on-some-physiological-and-immunological-parameters-in-different-breed-of-broilers
#1
Yongjie Xu, Xiaodan Lai, Zhipeng Li, Xiquan Zhang, Qingbin Luo
The differences in physiological and immunological parameters and pathological damage to organ tissues exposed to chronic heat stress provide the basis for evaluating heat resistance of different chicken breeds (white recessive rock [WRR] and The Lingshan [LS]). Ninety broilers of each breed were divided equally into a chronic heat stress group and a no heat stress group. The effects of chronic heat stress on the physiological and immunological parameters of broilers were analyzed using flow cytometry, ELISA, RT-qPCR, etc...
June 20, 2018: Poultry Science
https://www.readbyqxmd.com/read/29928950/contingency-training-alters-neurobiological-components-of-emotional-resilience-in-male-and-female-rats
#2
M Kent, S Scott, S Lambert, E Kirk, B Terhune-Cotter, B Thompson, S Neal, B Dozier, M Bardi, K Lambert
Prior research with a rat model of behavioral therapy [i.e., effort-based reward (EBR) contingency training] suggests that strengthened associations between physical effort and desired outcomes enhance neurobiological indices of resilience. In the current study, male and female Long-Evans rats were exposed to either six weeks of EBR training or noncontingent training prior to 10 days of exposure to chronic unpredictable stress (CUS). Subsequently, all animals were exposed to a problem-solving task and then trained in a spatial learning/foraging task, the dry land maze (DLM)...
June 18, 2018: Neuroscience
https://www.readbyqxmd.com/read/29928891/sex-and-breeding-stage-specific-hormonal-stress-response-of-seabird-parents
#3
Katarzyna Wojczulanis-Jakubas, Dariusz Jakubas, Monika Kulpińska-Chamera, Olivier Chastel
Changes in corticosterone (CORT) and prolactin (PRL) levels are thought to provide complementary information on parental decisions in birds in the context of stressful situations. However, these endocrine mechanisms have yet to be fully elucidated, appearing to vary among avian species without any clear pattern. Here, we examined CORT and PRL stress responses in a small Arctic seabird, the little auk (Alle alle). We analysed the levels of these hormones (baseline, and stress response, i.e. the change in the baseline in response to stress) with respect to the breeding phase (mid incubation and mid chick rearing) and the sex of the birds...
June 18, 2018: Hormones and Behavior
https://www.readbyqxmd.com/read/29927732/intermittent-hypoxia-improves-behavioral-and-adrenal-gland-dysfunction-induced-by-post-traumatic-stress-disorder-in-rats
#4
Eugenia B Manukhina, Vadim E Tseilikman, Olga B Tseilikman, Maria V Komelkova, Marina V Kondashevskaya, Anna V Goryacheva, Maxim S Lapshin, Pavel O Platkovskii, Anatoly V Alliluev, H Fred Downey
Non-pharmacological treatments of stress-induced disorders are promising, since they enhance endogenous stress defense systems and have few contraindications and side effects. This study tested a hypothesis that intermittent hypoxia conditioning (IHC) ameliorates behavioral, biochemical, and morphological signs of experimental PTSD induced in rats using a model of predator stress (10-day exposure to cat urine scent, 15 min daily followed by 14 days of stress-free rest). After the last day of stress exposure, rats were conditioned in an altitude chamber for 14 days at a 1,000 m simulated altitude for 30 min on day 1 with progressively increasing the altitude and duration to 4,000 m for 4 hours on day 5...
June 21, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29926662/-effects-and-mechanisms-of-6-week-intensive-training-on-renal-function-in-rats
#5
Yan-Long Niu, Jian-Min Cao, Hai-Tao Zhou, Jie Li
OBJECTIVE: To study the effect of 6-week intensive training on renal function in rats and the mechanism of exercise-induced proteinuria. METHODS: Thirty-six male SD rats, aged 6 weeks, were divided into two groups, including a control group(C, n =12)and an overtraining group(M, n =24). After the rats adapted to feeding for 4 d, group C did not carry out any exercise, and the M group did 6-week of increasing load swimming, 6 days a week, once a day. Started with the load of 1%weight at the beginning of the 4th week,and gradually increased (to 6% weight)...
January 8, 2018: Chinese Journal of Applied Physiology
https://www.readbyqxmd.com/read/29924361/adrenocortical-responses-in-japanese-quail-classified-by-their-permanence-in-proximity-to-either-low-or-high-density-of-conspecifics
#6
D A Guzmán, A Lèche, C B Contarde, F N Nazar, R H Marin
The density-related permanence test (DRP) is used to classify young birds (while in groups) according to their individual permanence in proximity to either a high or low density of conspecifics (HD or LD, respectively). The birds' performance in DRP was associated with underlying differences in the social responses of their individuals. Quails in homogeneous groups of LD residents responded with less compact groups and higher levels of agonistic interactions to the presence of an intruder, and showed higher levels of agonistic interactions among cagemates than the homogeneous groups of HD birds...
June 19, 2018: Poultry Science
https://www.readbyqxmd.com/read/29922743/neuropathic-pain-drives-anxiety-behavior-in-mice-results-consistent-with-anxiety-levels-in-diabetic-neuropathy-patients
#7
Christine B Sieberg, Caitlin Taras, Aya Gomaa, Chelsea Nickerson, Cindy Wong, Catherine Ward, Georgios Baskozos, David L H Bennett, Juan D Ramirez, Andreas C Themistocleous, Andrew S C Rice, Pallai R Shillo, Solomon Tesfaye, Robert R Edwards, Nick A Andrews, Charles Berde, Michael Costigan
Background: Epidemiological studies in patients with neuropathic pain demonstrate a strong association with psychiatric conditions such as anxiety; however, the precipitating pathology between these symptoms remains unclear. To investigate this, we studied the effects of lifelong stress on levels of neuropathic pain-like behavior and conversely, the effects of chronic neuropathic injury on anxiety-like status in male and female mice. In addition, we assayed this link in painful and painless diabetic peripheral neuropathy patients...
May 2018: Pain Reports (Baltimore, Md.)
https://www.readbyqxmd.com/read/29921483/melatonin-attenuates-chronic-immobilization-stress-induced-muscle-atrophy-in-rats-influence-on-lactate-to-pyruvate-ratios-and-na-k-atpase-activity
#8
Eman S H Abd Allah, Ahmed M Mahmoud
This study assessed the protective effect of melatonin against muscle atrophy provoked by chronic immobilization stress (CIS). CIS was induced in rats by limiting their trunk movement for 90 min daily for 6 weeks. Rats subjected to the CIS procedure demonstrated a substantial decrease in body weight, an increase in serum corticosterone, muscle atrophy, and an increase in atrogin-1 mRNA levels. An increase in the serum lactate-to-pyruvate ratio and the oxidative stress accompanied by a reduction of Na+ /K+ ATPase activity could be responsible for these changes...
June 16, 2018: Pathophysiology: the Official Journal of the International Society for Pathophysiology
https://www.readbyqxmd.com/read/29920498/preventive-effect-of-mebicar-and-ginsenoside-rg1-on-neurobehavioral-and-immunological-disruptions-caused-by-intermittent-unpredictable-stress-in-mice
#9
Chang Yul Kim, Yeon Gyeong Kim, So Jung Sin, Hyojin Koo, Kicheol Cheon, Dongsoo Kim
OBJECTIVES: Ginsenoside Rg1 and mebicar have been reported to have broad efficacy spectrum, including anti-anxiety and anti-stress. These drugs have been used not only for treatment but also for the purpose of increasing resistance from disease. A specific aim of this study was to investigate whether mebicar or ginsenoside Rg1 can prevent physiological changes resulting from intermittent unpredictable stress (IUS). METHODS: Seven week-old Balb/cByJ mice were administered orally with mebicar (10 mg/kg) or ginsenoside Rg1 (10 mg/kg) starting from a week before they were exposed to IUS until the end of the experiment...
June 19, 2018: Neuroimmunomodulation
https://www.readbyqxmd.com/read/29920496/stress-aggravates-high-fat-diet-induced-insulin-resistance-via-a-mechanism-that-involves-the-amygdala-and-is-associated-with-changes-in-neuroplasticity
#10
Sheng-Feng Tsai, Hung-Tsung Wu, Po See Chen, Pei-Chun Chen, Yun-Wen Chen, Megan Yu, Shun-Fen Tzeng, Pei-Hsuan Wu, Yu-Min Kuo
<br>Background: The notion that exposure to chronic stress predisposes individuals to develop Type 2 diabetes (T2D) has gained much attention in recent decades. Long-term stress induces neuroadaptation in the amygdala and increases corticosterone levels. Corticosterone, the major stress hormone in rodents, induces insulin resistance and obesity in mice. However, little is known whether the stress-induced amygdalar neuroadaptation could promote the risk of T2D. METHODS: We used an 11-week high-fat-diet (HFD) feeding paradigm to induce insulin dysfunction in mice, followed by implementing a 10-day social defeat (SD) stress protocol...
June 19, 2018: Neuroendocrinology
https://www.readbyqxmd.com/read/29913170/seasonal-changes-in-plasma-concentrations-of-the-thyroid-glucocorticoid-and-reproductive-hormones-in-the-tegu-lizard-salvator-merianae
#11
Lucas A Zena, Danielle Dillon, Kathleen E Hunt, Carlos A Navas, Kênia C Bícego, C Loren Buck
The tegu lizard Salvator merianae is a large, widely distributed teiid lizard endemic to South America that exhibits annual cycles of high activity during the spring and summer, and hibernation during winter. This pattern of activity and hibernation is accompanied by profound seasonal changes in physiology and behavior, including endothermy during the austral spring. The unusual combination of seasonal endothermy, hibernation and oviparity, in a non-avian, non-mammalian species, makes S. merianae an interesting subject for study of comparative aspects of endocrine regulation of seasonal changes in physiology...
June 15, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29909293/learning-to-actively-cope-with-stress-in-female-mice
#12
David M Lyons, Christine L Buckmaster, Alan F Schatzberg
Repeated exposure to a same-sex resident stranger enhances subsequent indications of active coping that generalize across multiple contexts in intruder male mice. Here we investigate female mice for comparable learning to cope training effects. Stress coping research focused on females is important because stress related mood and anxiety disorders are more prevalent in women than men. Female mice were monitored for coping behavior in open-field, object-exploration, and tail-suspension tests conducted after repeated exposure to a same-sex resident stranger...
June 9, 2018: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/29908835/interactions-of-body-temperature-and-nutritional-status-on-hypothalamo-pituitary-adrenal-axis-activity-in-pre-thermoregulatory-eastern-bluebird-chicks-sialia-sialis
#13
Sharon E Lynn, Michael D Kern
Early life experiences can affect the function of the hypothalamo-pituitary-adrenal (HPA) axis of vertebrates, with potential fitness consequences later in life. In altricial species, for example, variation in parental behavior, e.g. brooding or feeding, can modify the activity of the HPA axis of the young by altering their exposure to noxious stimuli as they develop in the nest. We have shown that a drop in the body temperature of eastern bluebird (Sialia sialis) chicks, such as occurs when females are away from the nest, elevates their blood corticosterone levels...
June 14, 2018: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/29907879/profiling-changes-in-cortical-astroglial-cells-following-chronic-stress
#14
Stephanie Simard, Gianfilippo Coppola, Christopher A Rudyk, Shawn Hayley, Robyn J McQuaid, Natalina Salmaso
Recent studies have suggested that cortical astroglia play an important role in depressive-like behaviors. Potential astroglial contributions have been proposed based on their known neuroplastic functions, such as glutamate recycling and synaptic plasticity. However, the specific mechanisms by which astroglial cells may contribute or protect against a depressive phenotype remain unknown. To delineate astroglial changes that accompany depressive-like behavior, we used astroglial-specific bacTRAP mice exposed to chronic variable stress (CVS) and profiled the astroglial translatome using translating ribosome affinity purification (TRAP) in conjunction with RNAseq...
May 29, 2018: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29904345/a-larger-social-network-enhances-novel-object-location-memory-and-reduces-hippocampal-microgliosis-in-aged-mice
#15
Bryon M Smith, Xinyue Yao, Kelly S Chen, Elizabeth D Kirby
The mammalian hippocampus shows marked decline in function with aging across many species, including humans and laboratory rodent models. This decline frequently manifests in memory impairments that occur even in the absence of dementia pathology. In humans, a number of factors correlate with preserved hippocampal memory in aging, such as exercise, cognitive stimulation and number of social ties. While interventional studies and animal models clearly indicate that exercise and cognitive stimulation lead to hippocampal preservation, there is relatively little research on whether a decline in social ties leads to cognitive decline or vice versa...
2018: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29904069/exposure-to-an-anti-androgenic-herbicide-negatively-impacts-reproductive-physiology-and-fertility-in-xenopus-tropicalis
#16
F Orton, M Säfholm, E Jansson, Y Carlsson, A Eriksson, J Fick, T Uren Webster, T McMillan, M Leishman, B Verbruggen, T Economou, C R Tyler, C Berg
Amphibians are threatened on a global scale and pollutants may be contributing to population declines, but how chemicals impact on their reproduction is poorly understood. We conducted a life cycle analysis to investigate the impacts of early life exposure to two anti-androgens (exposure until completion of metamorphosis;stage 66): flutamide, (50 µg/L)/linuron (9 and 45 µg/L)) on sexual development and breeding competence in Xenopus tropicalis. Our analyses included: mRNA levels of dmrt1, cyp17, amh, cyp19, foxl2 and ar (tadpoles/metamorphs), gonadal histomorphology (metamorphs/adults), mRNA levels of ar/gr (adult male brain/gonad/forelimb), testosterone/corticosterone levels (adult males), secondary sexual characteristics (forelimb width/nuptial pad: adult males) and breeding competence (amplexus/fertility: adult males)...
June 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29902479/single-oral-administration-of-flavan-3-ols-induces-stress-responses-monitored-with-stress-hormone-elevations-in-the-plasma-and-paraventricular-nucleus
#17
Yasuyuki Fujii, Kenta Suzuki, Yahiro Hasegawa, Fumio Nanba, Toshiya Toda, Takahiro Adachi, Shu Taira, Naomi Osakabe
We previously confirmed that postprandial alterations in the circulation and metabolism after a single oral dose of flavan 3-ols (mixture of catechin and catechin oligomers) were involved in an increase in sympathetic nervous activity. However, it is well known that, in response to various stresses, activation of the hypothalamic-pituitary-adrenal (HPA) axis occurs together with sympathetic nerve activity, which is associated with activation of the sympathetic-adrenal-medullary (SAM) axis. In this study, we examined whether the HPA axis was activated after a single dose of flavan 3-ols...
June 11, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29901761/an-evaluation-of-methods-for-measuring-stress-in-broiler-chickens
#18
Shawna L Weimer, Robert F Wideman, Colin G Scanes, Andy Mauromoustakos, Karen D Christensen, Yvonne Vizzier-Thaxton
There are potential advantages for using noninvasive methods instead of conventional approaches for measuring corticosterone (CORT) as a metric of stress. Two studies compared blood heterophil: lymphocyte (H:L) ratios, serum CORT, cecal content CORT (Study 1), colon content CORT (Study 2), and feather CORT concentrations for broiler chicks receiving drinking water with or without added CORT. On day 28, male broilers (N = 140) were provided tap water (Control group) or water containing 20 mg/L of CORT (CORT group) for up to 72 h...
June 13, 2018: Poultry Science
https://www.readbyqxmd.com/read/29901435/sex-dependent-responses-to-exertional-heat-stroke-in-mice
#19
Christian K Garcia, Alex J Mattingly, Gerard P Robinson, Orlando Laitano, Michelle A King, Shauna M Dineen, Lisa R Leon, Thomas L Clanton
With increasing participation of females in endurance athletics and active military service, it is important to determine if there are inherent sex-dependent susceptibilities to exertional heat injury or heat stroke. In this study we compared responses of male and female adult mice to exertional heat stroke (EHS). All mice were instrumented for telemetry core temperature measurement and were exercise-trained for 3 weeks prior to EHS. During EHS, environmental temperature was 37.5{degree sign}C (35% RH) while the mice ran on a forced running wheel, using incremental increases in speed...
June 14, 2018: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29901389/3-4-dihydroxyphenylethanol-assuages-cognitive-impulsivity-in-alzheimer-s-disease-by-attuning-hpa-axis-via-differential-crosstalk-of-%C3%AE-7-nachr-with-microrna-124-and-hdac6
#20
ArunSundar MohanaSundaram, Thukani Sathanantham Shanmugarajan, Velayutham Ravichandiran
Cognitive impulsivity, a form of suboptimal cost-benefit decision making is an illustrious attribute of an array of neurodegenerative diseases including Alzheimer's Disease (AD). In this study, delay discounting paradigm was used to assess the effect of 3,4-dihydroxyphenylethanol (DOPET) on cognitive impulsivity-in an oA42i (oligomeric amyloid β1-42 plus ibotenic acid) induced AD mouse model-using a non-spatial T-maze task. The results depicted that oA42i administration elevated cognitive impulsivity, whereas DOPET treatment attenuated the impulsive behavior and matched the choice of the sham-operated controls...
June 14, 2018: ACS Chemical Neuroscience
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