105,380 results match your criteria rats acute

Acute effects of 2.856 GHz and 1.5 GHz microwaves on spatial memory abilities and CREB-related pathways.

Sci Rep 2021 Jun 11;11(1):12348. Epub 2021 Jun 11.

Department of Experimental Pathology, Beijing Institute of Radiation Medicine, Beijing, People's Republic of China.

This study aimed to evaluate the acute effects of 2.856 GHz and 1.5 GHz microwaves on spatial memory and cAMP response element binding (CREB)-related pathways. Read More

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Effects of gonadal status and the estrogen milieu on hypothalamic oxytocin gene expression and serum oxytocin levels in female rats.

Horm Behav 2021 Jun 8;133:105005. Epub 2021 Jun 8.

Department of Obstetrics and Gynecology, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto-Cho, Tokushima 770-8503, Japan. Electronic address:

Oxytocin (OT) and its receptor (OTR) play various roles in the central and peripheral regulation of appetite and body weight. Previously, we have shown that the administration of OT markedly decreased appetite and body weight gain in ovariectomized (OVX) obese rats. In addition, recent studies have shown that the endogenous OT system is also affected by endogenous or exogenous estrogen. Read More

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Subregion-specific effects on striatal neurotransmission and dopamine-signaling by acute and repeated amphetamine exposure.

Neuropharmacology 2021 Jun 8:108638. Epub 2021 Jun 8.

Addiction Biology Unit, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy, University of Gothenburg, Sweden; Department of Pharmacology, Institute of Neuroscience and Physiology, Sahlgrenska Academy University of Gothenburg, Sweden. Electronic address:

Repeated administration of psychostimulants, such as amphetamine, is associated with a progressive increased sensitivity to some of the drug's effects, but tolerance towards others. We hypothesized that these adaptations in part could be linked to differential effects by amphetamine on dopaminergic signaling in striatal subregions. To test this theory, acute and long-lasting changes in dopaminergic neurotransmission were assessed in the nucleus accumbens (nAc) and the dorsomedial striatum (DMS) following amphetamine exposure in Wistar rats. Read More

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Toxicon 2021 Jun 8. Epub 2021 Jun 8.

Programa de Pós-graduação em Farmacologia e Química Medicinal, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil. Electronic address:

There is no consensus on whether serotherapy prevents acute kidney injury (AKI) and there is no pharmacotherapy to impede the disease. We aimed to elaborate an AKI model induced by the administration of Bothrops jararacussu (Bj) venom for preclinical studies. Male Wistar rats were randomly divided into 3 different groups: (1) Bj-IV: intravenous administration of 0. Read More

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Renoprotective effects of levosimendan on acute kidney injury following cardiac arrest via anti-inflammation, anti-apoptosis and ERK activation.

FEBS Open Bio 2021 Jun 11. Epub 2021 Jun 11.

Department of Emergency, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.

ATP-sensitive potassium channels (KATPs) have protective effects in ischemia-reperfusion-induced injuries and can be activated by levosimendan. This study investigated the effects of levosimendan on renal injury, inflammation, apoptosis and survival in a rat model of acute kidney injury (AKI) following cardiac arrest (CA) and cardiopulmonary resuscitation (CPR). Rats underwent a 5-minute asphyxia-based CA and resuscitation. Read More

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Hypercapnia Modulates the Activity of Adenosine A1 Receptors and mitoK-Channels in Rat Brain When Exposed to Intermittent Hypoxia.

Neuromolecular Med 2021 Jun 11. Epub 2021 Jun 11.

Krasnoyarsk State Medical University named after Prof. V.F. Voino-Yasenetsky, Partizan Zheleznyak st., 1., Krasnoyarsk, Russian Federation, 660022.

The mechanisms and signaling pathways of the neuroprotective effects of hypercapnia and its combination with hypoxia are not studied sufficiently. The study aims to test the hypothesis of the potentiating effect of hypercapnia on the systems of adaptation to hypoxia, directly associated with A1-adenosine receptors and mitochondrial ATP-dependent K+ -channels (mitoK-channels). We evaluated the relative number of A1-adenosine receptors and mitoK-channels in astrocytes obtained from male Wistar rats exposed to various respiratory conditions (15 times of hypoxia and/or hypercapnia). Read More

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β-cyclodextrin chitosan-based hydrogels with tunable pH-responsive properties for controlled release of acyclovir: design, characterization, safety, and pharmacokinetic evaluation.

Drug Deliv 2021 Dec;28(1):1093-1108

Department of Pharmacy, The Women University, Multan, Pakistan.

In this work, series of pH-responsive hydrogels (FMA1-FMA9) were synthesized, characterized, and evaluated as potential carrier for oral delivery of an antiviral drug, acyclovir (ACV). Different proportions of β-cyclodextrin (β-CD), chitosan (CS), methacrylic acid (MAA) and N' N'-methylenebis-acrylamide (MBA) were used to fabricate hydrogels free radical polymerization technique. Fourier transform infrared spectroscopy confirmed fabrication of new polymeric network, with successful incorporation of ACV. Read More

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December 2021

Augmented Respiratory-Sympathetic Coupling and Hemodynamic Response to Acute Mild Hypoxia in Female Rodents With Chronic Kidney Disease.

Front Physiol 2021 25;12:623599. Epub 2021 May 25.

Department of Biomedical Sciences, Macquarie University, Sydney, NSW, Australia.

Carotid body feedback and hypoxia may serve to enhance respiratory-sympathetic nerve coupling (respSNA) and act as a driver of increased blood pressure. Using the Lewis polycystic kidney (LPK) rat model of chronic kidney disease, we examined respSNA in adult female rodents with CKD and their response to acute hypoxia or hypercapnia compared to Lewis control animals. Under urethane anesthesia, phrenic nerve activity, splanchnic sympathetic nerve activity (sSNA), and renal sympathetic nerve activity (rSNA) were recorded under baseline conditions and during mild hypoxic or hypercapnic challenges. Read More

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Optogenetic Manipulations of Amygdala Neurons Modulate Spinal Nociceptive Processing and Behavior Under Normal Conditions and in an Arthritis Pain Model.

Front Pharmacol 2021 25;12:668337. Epub 2021 May 25.

Department of Pharmacology and Neuroscience, School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX, United States.

The amygdala is an important neural substrate for the emotional-affective dimension of pain and modulation of pain. The central nucleus (CeA) serves major amygdala output functions and receives nociceptive and affected-related information from the spino-parabrachial and lateral-basolateral amygdala (LA-BLA) networks. The CeA is a major site of extra-hypothalamic expression of corticotropin releasing factor (CRF, also known as corticotropin releasing hormone, CRH), and amygdala CRF neurons form widespread projections to target regions involved in behavioral and descending pain modulation. Read More

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Improving NKCC1 Function Increases the Excitability of DRG Neurons Exacerbating Pain Induced After TRPV1 Activation of Primary Sensory Neurons.

Front Cell Neurosci 2021 25;15:665596. Epub 2021 May 25.

The Key Laboratory of Xinjiang Endemic and Ethnic Diseases, Department of Physiology, Shihezi University Medical College, Shihezi, China.

Our aim was to investigate the effects of the protein expression and the function of sodium, potassium, and chloride co-transporter (NKCC1) in the dorsal root ganglion (DRG) after activation of transient receptor potential vanilloid 1 receptor (TRPV1) in capsaicin-induced acute inflammatory pain and the possible mechanism of action. Male Sprague-Dawley rats were randomly divided into control, capsaicin, and inhibitor groups. The expression and distribution of TRPV1 and NKCC1 in rat DRG were observed by immunofluorescence. Read More

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[Celastrol alleviates sepsis-induced acute lung injury in rats by inhibiting the Toll-like receptor 4/nuclear factor-κB inflammatory pathway].

Zhonghua Wei Zhong Bing Ji Jiu Yi Xue 2021 May;33(5):541-545

Department of Intensive Care Unit, Jiangxi Provincial People's Hospital, Nanchang 330006, Jiangxi, China.

Objective: To investigate the protective effect and mechanism of celastrol in acute lung injury (ALI) of septic rats.

Methods: According to random number table, 24 male Sprague-Dawley (SD) rats were divided into control group (Con group), Sham operation group (Sham group), sepsis-induced ALI group by cecal ligation and perforation (CLP group) and celastrol intervention group (CLP+celastrol group, 2 mg/kg intraperitoneal administration 1 hour before surgery), 6 rats in each group. The abdominal aortic blood of the rats was collected for blood gas analysis 24 hours after the surgery, and then the rats were sacrificed and the lung tissues were taken to calculate the lung wet to dry weight ratio (W/D). Read More

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Placental chorionic plate-derived mesenchymal stem cells ameliorate severe acute pancreatitis by regulating macrophage polarization via secreting TSG-6.

Stem Cell Res Ther 2021 Jun 10;12(1):337. Epub 2021 Jun 10.

Department of General Surgery & Pancreatic Injury and Repair Key Laboratory of Sichuan Province, The General Hospital of Western Theater Command, Chengdu, 610083, China.

Background: Mesenchymal stem cells (MSCs) hold promising potential to treat systemic inflammatory diseases including severe acute pancreatitis (SAP). In our previous study, placental chorionic plate-derived MSCs (CP-MSCs) were found to possess superior immunoregulatory capability. However, the therapeutic efficacy of CP-MSCs on SAP and their underlying mechanism remain unclear. Read More

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Relevant essential oil components: a minireview on increasing applications and potential toxicity.

Toxicol Mech Methods 2021 Jun 10:1-27. Epub 2021 Jun 10.

Laboratory of Toxicology, Faculty of Pharmacy, Universitat de València. Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain.

Phenolic compounds carvacrol, thymol, eugenol and vanillin are four of the most thoroughly investigated essential oil components given their relevant biological properties. These compounds are generally considered safe for consumption and have been used in a wide range of food and non-food applications. Significant biological properties, including antimicrobial, antioxidant, analgesic, anti-inflammatory, anti-mutagenic or anti-carcinogenic activity, have been described for these components. Read More

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Orexin 2 receptor in the nucleus accumbens is critical for the modulation of acute stress-induced anxiety.

Psychoneuroendocrinology 2021 Jun 7;131:105317. Epub 2021 Jun 7.

School of Life Sciences, Nanjing University, Nanjing, China.

Orexin is a neuropeptide mainly synthesized in the lateral hypothalamus/perifornical area and has been traditionally implicated in feeding, sleep-wake cycles, and reward. Intriguingly, patients with anxiety have increased levels of orexin in the cerebrospinal fluid. Pharmacological or genetic manipulation of orexin receptors affects anxiety-like behaviors in rodents, suggesting an involvement of the orexin signaling in the regulation of anxiety. Read More

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Thymol regulates the functions of immune cells in the rat peritoneal cavity after l-arginine-induced pancreatitis.

Life Sci 2021 Jun 7;280:119704. Epub 2021 Jun 7.

Department of Chemistry, Faculty of Sciences and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia.

Aims: The present study aimed to evaluate the protective action of thymol towards l-arginine-induced acute pancreatitis (AP) by studying the function of rat peritoneal immune cells.

Main Methods: Rat peritoneal exudate cells (PECs), obtained 24 h after the injection of l-arginine (350 mg/100 g of b.w. Read More

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Stress and corticotropin releasing factor (CRF) promote necrotizing enterocolitis in a formula-fed neonatal rat model.

PLoS One 2021 10;16(6):e0246412. Epub 2021 Jun 10.

Department of Obstetrics and Gynecology, Center for Reproductive Sciences, University of California San Francisco, San Francisco, California, United States of America.

The etiology of necrotizing enterocolitis (NEC) is not known. Alterations in gut microbiome, mucosal barrier function, immune cell activation, and blood flow are characterized events in its development, with stress as a contributing factor. The hormone corticotropin-releasing factor (CRF) is a key mediator of stress responses and influences these aforementioned processes. Read More

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Tryptophan Pathway-Targeted Metabolomics Study on the Mechanism and Intervention of Cisplatin-Induced Acute Kidney Injury in Rats.

Chem Res Toxicol 2021 Jun 10. Epub 2021 Jun 10.

Key Laboratory of Drug Quality Control and Pharmacovigilance (Ministry of Education), State Key Laboratory of Natural Medicine, China Pharmaceutical University, Nanjing 210009, P.R. China.

Cisplatin is a chemotherapeutic agent widely employed in the treatment of various solid tumors. However, its use is often restricted by acute kidney injury (AKI) which is the dose-limiting adverse effect of cisplatin. While numerous studies aiming to alleviate the AKI have been conducted, there are no effective remedies in clinical practice. Read More

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Quality by design (QbD)-based fabrication of atazanavir-loaded nanostructured lipid carriers for lymph targeting: bioavailability enhancement using chylomicron flow block model and toxicity studies.

Drug Deliv Transl Res 2021 Jun 10. Epub 2021 Jun 10.

Department of Pharmaceutical Chemistry, H. R. Patel Institute of Pharmaceutical Education and Research, Shirpur 425 405, Maharashtra, India.

Atazanavir (ATV) is widely used as anti-HIV agent having poor aqueous solubility needs to modulate novel drug delivery system to enhance therapeutic efficiency and safety. The main objective of the present work was to fabricate ATV-loaded nanostructured lipid carriers (NLCs) employing quality by design (QbD) approach to address the challenges of bioavailability and their safety after oral administration. Herein, the main objective was to identify the influencing variables for the production of quality products. Read More

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Blocking SphK1/S1P/S1PR1 Signaling Pathway Alleviates Lung Injury Caused by Sepsis in Acute Ethanol Intoxication Mice.

Inflammation 2021 Jun 9. Epub 2021 Jun 9.

Jinling Clinical Medical College, Nanjing Medical University, 305 Zhongshan East Road, Xuanwu District, Nanjing City, 210002, Jiangsu Province, China.

Acute ethanol intoxication increases the risk of sepsis and aggravates the symptoms of sepsis and lung injury. Therefore, this study aimed to explore whether sphingosine kinase 1 (SphK1)/sphingosine-1-phosphate (S1P)/S1P receptor 1 (S1PR1) signaling pathway functions in lung injury caused by acute ethanol intoxication-enhanced sepsis, as well as its underlying mechanism. The acute ethanol intoxication model was simulated by intraperitoneally administering mice with 32% ethanol solution, and cecal ligation and puncture (CLP) was used to construct the sepsis model. Read More

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A systematic review to compare chemical hazard predictions of the zebrafish embryotoxicity test with mammalian prenatal developmental toxicity.

Toxicol Sci 2021 Jun 9. Epub 2021 Jun 9.

Evidence-Based Toxicology Collaboration (EBTC), Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, 21205.

Originally developed to inform the acute toxicity of chemicals on fish, the zebrafish embryotoxicity test (ZET) has also been proposed for assessing the prenatal developmental toxicity of chemicals, potentially replacing mammalian studies. While extensively evaluated in primary studies, a comprehensive review summarizing the available evidence for the ZET's capacity is lacking. Therefore, we conducted a systematic review of how well the presence or absence of exposure-related findings in the ZET predict prenatal development toxicity in studies with rats and rabbits. Read More

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Extracellular Vesicles Derived from Cardiosphere-Derived Cells (CDC-EVs) as a Potential Anti-Shock Therapeutic.

J Trauma Acute Care Surg 2021 Apr 8. Epub 2021 Apr 8.

Coagulation and Blood Research (Blood), The United States Army Institute of Surgical Research, San Antonio, Texas/ 78234-4504, United States. Capricor Therapeutics Institute, Beverly Hills, California, 90211 Department of Biological Chemistry, Johns Hopkins, Baltimore, Maryland/ 21218, United States. Department of Biomedical Engineering, The University of Texas at San Antonio, San Antonio, Texas/ 78249, United States.

Background: Extracellular vesicles (EVs) isolated from cardiosphere-derived cells (CDC-EVs) are coming to light as a unique, cell free therapeutic. Due to their novelty, however, there still exist prominent gaps in knowledge regarding their therapeutic potential. Herein the therapeutic potential of CDC-EVs in a rat model of acute traumatic coagulopathy induced by polytrauma and hemorrhagic shock is outlined. Read More

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The combination of deferoxamine and minocycline strengthens neuroprotective effect on acute intracerebral hemorrhage in rats.

Neurol Res 2021 Jun 10:1-11. Epub 2021 Jun 10.

Hotchkiss Brain Institute and Department of Clinical Neurosciences, University of Calgary, Calgary, AL, Canada.

: Intracerebral hemorrhage (ICH) is a devastating type of strokes that carries high mortality rates, but effective therapeutic options are still lacking. Here, the adult rat model of ICH was used to investigate the efficacy of a combinational therapy of deferoxamine (DFX) and minocycline.: The ICH was induced by stereotaxic infusion of collagenase into striatum of adult rats. Read More

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Long-term monitoring of chronic demyelination and remyelination in a rat ischemic stroke model using macromolecular proton fraction mapping.

J Cereb Blood Flow Metab 2021 Jun 9:271678X211020860. Epub 2021 Jun 9.

Laboratory of Neurobiology, Tomsk State University, Tomsk, Russian Federation.

Remyelination is a key process enabling post-stroke brain tissue recovery and plasticity. This study aimed to explore the feasibility of demyelination and remyelination monitoring in experimental stroke from the acute to chronic stage using an emerging myelin imaging biomarker, macromolecular proton fraction (MPF). After stroke induction by transient middle cerebral artery occlusion, rats underwent repeated MRI examinations during 85 days after surgery with histological endpoints for the animal subgroups on the 7th, 21st, 56th, and 85th days. Read More

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Exploring the role of Aquaporins (AQPs) in LPS induced systemic inflammation and the ameliorative effect of Garcinia in male Wistar rat.

Inflammopharmacology 2021 Jun 9. Epub 2021 Jun 9.

Department of Zoology, Animal Physiology and Biochemistry Laboratory, Gauhati University, Guwahati, 781014, Assam, India.

The Aquaporins (AQPs) could prove to be striking targets of inflammation. The aim of this study was to study the involvement of AQPs and explore the anti-inflammatory activity of Garcinia extract in LPS induced acute systemic inflammation in Wistar rats. Adult male Wistar rats (n = 6) were pretreated with Garcinia orally twice for 7 days, followed by a single intraperitoneal dose (5. Read More

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Effect of fluoxetine on seizures in rats with high susceptibility to audiogenic stress.

J Clin Transl Res 2021 Apr 22;7(2):277-284. Epub 2021 Apr 22.

Academician Abdulla Garayev Institute of Physiology, Azerbaijan National Academy of Sciences, Baku, Azerbaijan.

Background: The seizures, triggered by a loud sound in laboratory animals, are associated with the imbalance of the brain monoamines. Serotonin (5-HT) is regarded as one of the principal neurotransmitters to be involved in regulation of wide variety of physiological and psychological processes. Among the drugs that affect 5-HT synaptic transmission, the leading role is given to selective serotonin reuptake inhibitors (SSRIs), such as fluoxetine. Read More

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EZH2 Mediates miR-146a-5p/HIF-1 to Alleviate Inflammation and Glycolysis after Acute Spinal Cord Injury.

Mediators Inflamm 2021 19;2021:5591582. Epub 2021 May 19.

Orthopaedics, The First Affiliated Hospital of Zhengzhou University, Zhengzhou City, Henan Province, China.

Acute spinal cord injury (ASCI) is a severe traumatic disease of the central nervous system, the underlying mechanism of which is unclear. This study was intended to study the role of EZH2 and miR-146a-5p/HIF-1 in inflammation and glycolysis after ASCI, providing reference and basis for the clinical treatment and prognosis of ASCI injury. We used lipopolysaccharide (LPS) to induce inflammation of microglia, and we constructed the ASCI animal model. Read More

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Alterations in mRNA and protein expression of glutamate receptor subunits following pentylenetetrazole-induced acute seizures in young rats.

Neuroscience 2021 Jun 5. Epub 2021 Jun 5.

Sechenov Institute of Evolutionary Physiology and Biochemistry of RAS, 44, Toreza prospekt, Saint Petersburg 194223, Russia. Electronic address:

Acute seizures can severely affect brain function and development. However, the underlying pathophysiological mechanisms are still poorly understood. Disturbances of the glutamatergic system are considered one of the critical mechanisms of neurological abnormalities. Read More

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Tributyltin and high-refined carbohydrate diet lead to metabolic and reproductive abnormalities, exacerbating premature ovary failure features in the female rats.

Reprod Toxicol 2021 Jun 5. Epub 2021 Jun 5.

Department of Morphology, Health Sciences Center, Federal University of Espirito Santo, Av. Marechal Campos, 1468, CEP: 290440-090 Vitória, ES, Brazil. Electronic address:

Exposure to the obesogen tributyltin (TBT) alone or high carbohydrate diet (HCD) alone leads to obesity and reproductive complications, such as premature ovary failure (POF) features. However, little is known about interactions between TBT and nutrition and their combined impact on reproduction. In this study, we assessed whether acute TBT and HCD exposure results in reproductive and metabolic irregularities. Read More

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Effects of hydro-ethanolic extract of leaves of Maesa lanceolata (Mursinaceae) on acetic acid-induced ulcerative colitis in rats.

Inflammopharmacology 2021 Jun 8. Epub 2021 Jun 8.

Animal Physiology Laboratory, Faculty of Science, University of Yaoundé I, Yaoundé, Cameroon.

Ulcerative colitis is a form of inflammatory bowel disease that is characterized by acute and chronic inflammation. The aim of this work was to evaluate the efficacy of hydroethanolic extract of Maesa lanceolata leaves on acetic acid-induced colitis in rats. Colitis was induced by rectal administration of 1 mL of acetic acid (4%) in 25 male rats except the normal control group which received distilled water after 18 h of fasting followed by Ketamine (50 mg/kg)/Valium (10 mg/kg) anesthesia. Read More

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The role of pulmonary mast cells activation and degranulation in the process of increased pulmonary artery pressure.

Gen Physiol Biophys 2021 May;40(3):183-195

Research Center for High Altitude Medicine, Key Laboratory for High Altitude Medicine, Ministry of Education, Qinghai University, Xining, China.

Hypoxia exposure often cause the increases of pulmonary arterial pressure (PAP). Studies reported that mast cells (MCs) participate in pulmonary vascular remodeling and promote the formation of chronic pulmonary hypertension. Current studies mainly focus on the change of MCs under chronic hypoxia, but few studies on the regulatory role and mechanism of MCs under acute hypoxia. Read More

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