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Renal physiology

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https://www.readbyqxmd.com/read/28213276/engineering-approaches-in-sirna-delivery
#1
Anna Angela Barba, Sara Cascone, Diego Caccavo, Gaetano Lamberti, Gianluca Chiarappa, Michela Abrami, Gabriele Grassi, Mario Grassi, Giovanna Tomaiuolo, Stefano Guido, Valerio Brucato, Francesco Carfì Pavia, Giulio Ghersi, Vincenzo La Carrubba, Roberto Andrea Abbiati, Davide Manca
siRNAs are very potent drug molecules, able to silence genes involved in pathologies development. siRNAs have virtually an unlimited therapeutic potential, particularly for the treatment of inflammatory diseases. However, their use in clinical practice is limited because of their unfavorable properties to interact and not to degrade in physiological environments. In particular they are large macromolecules, negatively charged, which undergo rapid degradation by plasmatic enzymes, are subject to fast renal clearance/hepatic sequestration, and can hardly cross cellular membranes...
February 14, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28212823/cyp-epoxygenase-derived-h2o2-is-involved-in-the-endothelium-derived-hyperpolarization-edh-and-relaxation-of-intrarenal-arteries
#2
Mercedes Muñoz, Maria Elvira López-Oliva, Estéfano Pinilla, María Pilar Martínez, Ana Sánchez, Claudia Rodríguez, Albino García-Sacristán, Medardo Hernández, Luis Rivera, Dolores Prieto
Reactive oxygen species (ROS) like hydrogen peroxide (H2O2) are involved in the in endothelium-derived hyperpolarization (EDH)-type relaxant responses of coronary and mesenteric arterioles. The role of ROS in kidney vascular function has mainly been investigated in the context of harmful ROS generation associated to kidney disease. The present study was sought to investigate whether H2O2 is involved in the endothelium-dependent relaxations of intrarenal arteries as well the possible endothelial sources of ROS generation involved in these responses...
February 14, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28210939/deep-phenotyping-of-systemic-arterial-hemodynamics-in-hfpef-part-1-physiologic-and-technical-considerations
#3
REVIEW
Julio A Chirinos
A better understanding of the pathophysiology of heart failure with a preserved left ventricular ejection fraction (HFpEF) is important. Detailed phenotyping of pulsatile hemodynamics has provided important insights into the pathophysiology of left ventricular remodeling and fibrosis, diastolic dysfunction, microvascular disease, and impaired oxygen delivery to peripheral skeletal muscle, all of which contribute to exercise intolerance, the cardinal feature of HFpEF. Furthermore, arterial pulsatile hemodynamic mechanisms likely contribute to the frequent presence of comorbidities, such as renal failure and dementia, in this population...
February 16, 2017: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/28210225/increased-apoptosis-in-the-paraventricular-nucleus-mediated-by-at1r-ras-erk1-2-signaling-results-in-sympathetic-hyperactivity-and-renovascular-hypertension-in-rats-after-kidney-injury
#4
Hongguo Zhu, Lishan Tan, Yumin Li, Jiawen Li, Minzi Qiu, Lanying Li, Mengbi Zhang, Min Liang, Aiqing Li
Background: The central nervous system plays a vital role in the development of hypertension, but the molecular regulatory mechanisms are not fully understood. This study aimed to explore signaling in the paraventricular nucleus (PVN) which might contribute to renal hypertension. Methods: Renal hypertension model was established by five-sixth nephrectomy operation (5/6Nx) in male Sprague Dawley rats. Ten weeks afterwards, they were random assigned to no treatment, or intracerebroventricular injection (ICV) with artificial cerebrospinal fluid, losartan [angiotensin II receptor type 1 (AT1R) antagonist], farnesylthiosalicylic acid (Ras inhibitor), PD98059 (MEK inhibitor), or SB203580 (p38 inhibitor) and Z-DEVD-FMK (caspase-3 inhibitor)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28210101/acute-kidney-injury-in-elderly-intensive-care-patients-from-a-developing-country-clinical-features-and-outcome
#5
Laís Gabriela Yokota, Beatriz Motta Sampaio, Erica Rocha, André Luís Balbi, Daniela Ponce
AIM: The elderly are at high risk of acute kidney injury (AKI) because of structural and functional degeneration over time and with the aging of the population, the demand for intensive care unit (ICU) admission for older patients has risen recently. However, data from developing countries are scarce. This study aimed to describe the incidence of AKI in elderly patients admitted to ICU from a developing country, to determine the most frequent etiologies for renal impairment and identify its risk factors and outcome...
2017: International Journal of Nephrology and Renovascular Disease
https://www.readbyqxmd.com/read/28202365/optimising-the-use-of-medicines-to-reduce-acute-kidney-injury-in-children-and-babies
#6
REVIEW
L Oni, D B Hawcutt, M A Turner, M W Beresford, S McWilliam, C Barton, B K Park, P Murray, B Wilm, I Copple, R Floyd, M Peak, A Sharma, D J Antoine
The majority of medications in children are administered in an unlicensed or off-label manner. Paediatricians are obliged to prescribe using the limited evidence available. The 2007 EU regulation on the use of paediatric drugs means pharmaceutical companies are now obliged to (and receive incentives for) contributing to paediatric drug data and carrying out paediatric clinical trials. This is important, as the efficacy and adverse effect profiles of medicines vary across childhood. Additionally, there are significant age-related changes in the pharmacodynamic and pharmacokinetic activity of many drugs...
February 12, 2017: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28202171/residual-renal-function-a-paradigm-shift
#7
Jerome Lowenstein, Jared J Grantham
Residual renal function (RRF) in patients undergoing dialysis treatments is currently viewed as glomerular filtrate that has escaped tubular reabsorption. RRF has been quantified as a clearance of urea or creatinine, or urea + creatinine. A major paradigm shift has followed the recognition that a substantial number of organic anion retention solutes (possible "uremic toxins") are protein-bound and therefore are not readily filtered. These protein-bound aryl compounds are secreted by renal tubular organic anion transporters (OATs)...
March 2017: Kidney International
https://www.readbyqxmd.com/read/28198734/new-frontiers-in-intravital-microscopy-of-the-kidney
#8
Andrew M Hall, Claus D Schuh, Dominik Haenni
PURPOSE OF REVIEW: Intravital imaging with multiphoton microscopy enables the detailed study of dynamic cellular processes within functioning organs in living animals, in ways that would not otherwise be possible. It therefore represents a powerful tool in translational kidney research. In this article, we will discuss several new technical developments that have significantly increased the capabilities of kidney imaging. RECENT FINDINGS: Important contemporary advances in biomedical imaging technology include longer wavelength excitation lasers, far-red emitting fluorescent reporters, highly sensitive detectors, fluorescence lifetime measurements, adaptive optics, microendoscopes, high-throughput automated analysis algorithms and tissue clearing techniques...
February 13, 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/28188255/efficiacy-of-safranal-to-cisplatin-induced-nephrotoxicity
#9
Yasemin Karafakıoglu, Mehmet Fatih Bozkurt, Ömer Hazman, Fatih Fidan
The aim of this study was to investigate the effects of safranal on cisplatin-induced nephrotoxicity and oxidative stress in rats. Adult male Sprague-Dawley rats were randomly divided into five groups. The control group received physiological saline; animals in group 2 received only safranal and in group 3 received only cisplatin; 5 days of safranal treatment was performed following administration of cisplatin for the animals in group 4;5 days of safranal pre-treatment was applied to the animals in group 5 before administration of cisplatin...
February 10, 2017: Biochemical Journal
https://www.readbyqxmd.com/read/28182865/restoration-of-immune-and-renal-function-in-aged-females-by-re-establishment-of-active-ovarian-function
#10
Rhett L Peterson, Kate C Parkinson, Jeffrey B Mason
Proper immune functioning is necessary to maximize reproductive success. In addition, age-associated uremia in women is often associated with hypothalamic--pituitary-gonadal dysfunction. In the present experiments, we tested immune and renal function to determine if exposure of postreproductive mice to young, reproductively cycling ovaries would influence non-reproductive physiological functions. Control female CBA/J mice were evaluated at 6, 13 and 16 months of age. Additional mice received new (60-day-old) ovaries at 12 months of age and were evaluated at 16 months of age...
February 10, 2017: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/28180992/comprehensive-functional-analysis-of-rab-gtpases-in-drosophila-nephrocytes
#11
Yulong Fu, Jun-Yi Zhu, Fujian Zhang, Adam Richman, Zhanzheng Zhao, Zhe Han
The Drosophila nephrocyte is a critical component of the fly renal system and bears structural and functional homology to podocytes and proximal tubule cells of the mammalian kidney. Investigations of nephrocyte cell biological processes are fundamental to understanding the insect renal system. Nephrocytes are highly active in endocytosis and vesicle trafficking. Rab GTPases regulate endocytosis and trafficking but specific functions of nephrocyte Rabs remain undefined. We analyzed Rab GTPase expression and function in Drosophila nephrocytes and found that 11 out of 27 Drosophila Rabs were required for normal activity...
February 8, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28179447/diagnosis-of-endocrine-disease-differentiation-of-pathologic-neoplastic-hypercortisolism-cushing-syndrome-from-physiologic-non-neoplastic-hypercortisolism-formerly-known-as-pseudo-cushing-syndrome
#12
James Findling, Hershel Raff
Endogenous hypercortisolism (Cushing syndrome) usually implies the presence of a pathologic condition caused by either an ACTH-secreting neoplasm or autonomous cortisol secretion from a benign or malignant adrenal neoplasm. However, sustained or intermittent hypercortisolism may also accompany many medical disorders that stimulate physiologic/non-neoplastic activation of the HPA axis (formerly known as pseudo-Cushing syndrome); these two entities may share indistinguishable clinical and biochemical features...
February 8, 2017: European Journal of Endocrinology
https://www.readbyqxmd.com/read/28179256/zebrafish-mesonephric-renin-cells-are-functionally-conserved-and-comprise-of-two-distinct-morphological-populations
#13
Sebastien A Rider, Helen C Christian, Linda J Mullins, Amelia R Howarth, Calum A MacRae, John J Mullins
Zebrafish provide an excellent model in which to assess the role of the renin-angiotensin system in renal development, injury and repair. In contrast to mammals, zebrafish kidney organogenesis terminates with the mesonephros. Despite this, the basic functional structure of the nephron is conserved across vertebrates. The relevance of teleosts for studies relating to the regulation of the renin-angiotensin system was established by assessing the phenotype and functional regulation of renin-expressing cells in zebrafish...
February 8, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28179233/identification-of-a-mammalian-silicon-transporter
#14
Sarah Ratcliffe, Ravin Jugdaohsingh, Julien Vivancos, Alan Marron, Rupesh Deshmukh, Jian Feng Ma, Namiki Mitani-Ueno, Jack Robertson, John Wills, Mark V Boekschoten, Michael Müller, Robert C Mawhinney, Stephen D Kinrade, Paul Isenring, Richard R Bélanger, Jonathan J Powell
Silicon (Si) has long been known to play a major physiological and structural role in certain organisms, including diatoms, sponges, and many higher plants, leading to the recent identification of multiple proteins responsible for Si transport in a range of algal and plant species. In mammals, despite several convincing studies suggesting that silicon is an important factor in bone development and connective tissue health, there is a critical lack of understanding about the biochemical pathways that enable Si homeostasis...
February 8, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28179232/kidney-specific-genetic-deletion-of-both-ampk-%C3%AE-subunits-causes-salt-and-water-wasting
#15
Yoskaly Lazo-Fernández, Goretti Baile, Patricia Meade, Pilar Torcal, Laura Martínez, Carmen Ibañez, Maria Luisa Bernal, Benoit Viollet, Ignacio Giménez
AMP-activated kinase (AMPK) controls cell energy homeostasis by modulating ATP synthesis and expenditure. In vitro studies have suggested AMPK may also control key elements of renal epithelial electrolyte transport but in vivo physiological confirmation is still insufficient. We studied sodium renal handling and extracellular volume regulation in mice with genetic deletion of AMPK catalytic subunits. AMPKα1 knockout (KO) mice exhibit normal renal sodium handling and a moderate antidiuretic state. This is accompanied by higher urinary aldosterone excretion rates and reduced blood pressure...
February 1, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28179185/the-use-of-diclofenac-sodium-in-urological-practice-a-structural-and-neurochemical-based-review
#16
REVIEW
Mahmut Ulubay, Kıymet Kübra Yurt, Arife Ahsen Kaplan, Mustafa Kemal Atilla
Diclofenac sodium (DS) is a non-steroidal anti-inflammatory drug with antipyretic and analgesic effects. It is mainly found in the form of sodium salt. The mechanism of action of DS operates by way of cyclooxygenase (COX) inhibition. The physiological effect of this substance derives from a decrease in prostaglandin production. DS is a benzeneacetic acid derivative with anti-inflammatory properties. As a non-steroidal anti-inflammatory drug (NSAID), DS binds to both forms of COX (COX-1 and COX-2) and inhibits the conversion of arachidonic acid into pro-inflammatory prostaglandins by means of chelation...
February 5, 2017: Journal of Chemical Neuroanatomy
https://www.readbyqxmd.com/read/28177393/acidogenic-mineral-additions-increased-ca-mobilization-in-prepartum-sows
#17
C Darriet, D E Axe, T D Crenshaw
Increased sow milk production is associated with an increase in unexplained sow mortality during prepartum and early postpartum periods. This association has led to purported claims of hypocalcemic disorders. Assuming similar responses as dairy cows, feeding anionic mineral salts in late gestation and early lactation may reduce potential hypocalcemia related disorders in sows. Two experiments using CAD-MATE (Granco Minerals, Petersburg, VA), an acidogenic mineral supplement (AMS), were designed to determine the amount required to increase urinary Ca excretion and to identify renal compensatory responses to acid loads in sows...
January 2017: Journal of Animal Science
https://www.readbyqxmd.com/read/28174136/p-p-methoxyl-diphenyl-diselenide-elicits-an-antidepressant-like-effect-in-mice-without-discontinuation-anxiety-phenotype
#18
Carla Elena Sartori Oliveira, Marcel Henrique Marcondes Sari, Vanessa Angonesi Zborowski, Paulo Cesar Oliveira Araujo, Cristina Wayne Nogueira, Gilson Zeni
Major depressive disorder is the most severe and debilitating disease among psychiatric illnesses. The abrupt interruption of antidepressant treatment may lead to a complex physiological and neuropsychiatric syndrome. The organoselenium compound (MeOPhSe)2 has been reported to have neuroprotective properties in animal models. The study aimed to investigate the effects of single or repeated administration of (MeOPhSe)2 on depressive-like behavior and if the compound administration, and its discontinuation, may affect the anxiolytic-like phenotype in Swiss mice...
February 5, 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28167538/application-of-physiologically-based-pharmacokinetic-modeling-to-understanding-of-bosutinib-pharmacokinetics-prediction-of-drug-drug-and-drug-disease-interactions
#19
Chiho Ono, Poe-Hirr Hsyu, Richat Abbas, Cho-Ming Loi, Shinji Yamazaki
Bosutinib (Bosulif®) is an orally available Src/Abl tyrosine kinase inhibitor indicated for the treatment of patients with Ph+ chronic myelogenous leukemia. Bosutinib is predominantly metabolized by CYP3A4 as the primary clearance mechanism. The main objectives of the present study were to: 1) develop physiologically-based pharmacokinetic (PBPK) models of bosutinib, 2) verify and refine the PBPK models based upon clinical study results of bosutinib single-dose drug-drug interaction (DDI) with ketoconazole and rifampin, and single-dose drug-disease interaction (DDZI) in patients with renal and hepatic impairment, 3) apply the PBPK models to predict DDI outcome in patients with weak and moderate CYP3A inhibitors, and 4) apply the PBPK models to predict DDZI outcomes in renally and hepatically impaired patients after multiple-dose administration...
February 6, 2017: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/28166165/automated-variable-aortic-control-vs-complete-aortic-occlusion-in-a-swine-model-of-hemorrhage
#20
Timothy K Williams, Lucas P Neff, M Austin Johnson, Rachel M Russo, Sarah-Ashley Ferencz, Anders J Davidson, Nathan F Clement, J Kevin Grayson, Todd E Rasmussen
BACKGROUND: Future endovascular hemorrhage control devices will require features that mitigate the adverse effects of vessel occlusion. Permissive regional hypoperfusion (PRH) with variable aortic control (VAC) is a novel strategy to minimize hemorrhage and reduce the ischemic burden of complete aortic occlusion (AO). The objective of this study was to compare PRH with VAC to AO in a lethal model of hemorrhage. METHODS: Twenty-five swine underwent cannulation of the supraceliac aorta, with diversion of aortic flow through an automated extracorporeal circuit...
February 4, 2017: Journal of Trauma and Acute Care Surgery
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