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Renal physiology

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https://www.readbyqxmd.com/read/28531643/lipid-based-nutrient-supplements-containing-vitamins-and-minerals-attenuate-renal-electrolyte-loss-in-hiv-aids-patients-starting-antiretroviral-therapy-a-randomized-controlled-trial-in-zambia
#1
D Munkombwe, T L Muungo, C Michelo, P Kelly, S Chirwa, S Filteau
BACKGROUND & AIMS: Advanced HIV infection combined with undernutrition and antiretroviral therapy (ART) places HIV/AIDS patients at high risk of electrolyte abnormalities and increased morbidity and mortality. Here, in a sub-study of a large published randomized trial, we evaluated if nutritional supplements will help curtail renal electrolyte loss in HIV/AIDS patients starting ART. METHODS: 130 malnourished HIV-positive patients referred for ART received lipid-based nutrient supplements alone (LNS, n = 63) or together with vitamins and minerals (LNS-VM, n = 67)...
June 2016: Clinical Nutrition ESPEN
https://www.readbyqxmd.com/read/28530622/-laparoscopic-uretero-ureterostomy-for-iatrogenic-lesions-of-the-distal-ur%C3%A3-ter
#2
Álvaro Juárez Soto, Rubén Campanario Pérez, Rocío Sáiz Marenco, Javier Amores Bermúdez, Manuel Soto Delgado, Jose Miguel Arroyo Maestre, Margarita De Paz Suárez
The most frequent ureteral lesions are iatrogenic, mainly due to gynecologic and urologic procedures. The resolution and repair of these lesions, when they require surgery, is often the performance of ureteroneocystostomy. We describe the technique for the repair of distal ureter lesions that preserves both anatomy and function of the urinary tract (1). The operation consists in dissection and extraction of the distal ureteral stump from its intramural tract to get at least 1 cm of free ureter, percutaneous insertion of a ureteral stent, checking the absence of tension between proximal ureter and distal dissected stump, end to end anastomosis and reinsertion of the distal ureter in the previously dissected bladder muscle layer...
May 2017: Archivos Españoles de Urología
https://www.readbyqxmd.com/read/28530118/readmission-to-intensive-care-unit-incidence-risk-factors-resource-use-and-outcomes-a-retrospective-cohort-study
#3
Carolina R Ponzoni, Thiago D Corrêa, Roberto R Filho, Ary Serpa Neto, Murillo Sc Assunção, Andreia Pardini, Guilherme Pp Schettino
RATIONALE: Readmission to intensive care unit (ICU) is associated with poor clinical outcomes, increased length of ICU and hospital stay and higher costs. Nevertheless, knowledge on epidemiology of ICU readmissions, risk factors and attributable outcomes are restricted to developed countries. OBJECTIVES: Determine the effect of ICU readmissions on in-hospital mortality, incidence of ICU readmissions, identify predictors of ICU readmissions and hospital mortality and compare resource use and outcomes between readmitted and nonreadmitted patients in a developing country...
May 21, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28529633/noninvasive-assessment-of-elimination-and-retention-using-ct-fmt-and-kinetic-whole-body-modeling
#4
Wa'el Al Rawashdeh, Simin Zuo, Andrea Melle, Lia Appold, Susanne Koletnik, Yoanna Tsvetkova, Nataliia Beztsinna, Andrij Pich, Twan Lammers, Fabian Kiessling, Felix Gremse
Fluorescence-mediated tomography (FMT) is a quantitative three-dimensional imaging technique for preclinical research applications. The combination with micro-computed tomography (µCT) enables improved reconstruction and analysis. The aim of this study is to assess the potential of µCT-FMT and kinetic modeling to determine elimination and retention of typical model drugs and drug delivery systems. We selected four fluorescent probes with different but well-known biodistribution and elimination routes: Indocyanine green (ICG), hydroxyapatite-binding OsteoSense (OS), biodegradable nanogels (NG) and microbubbles (MB)...
2017: Theranostics
https://www.readbyqxmd.com/read/28527110/a-review-of-the-hemodynamic-factors-believed-to-contribute-to-vascular-access-dysfunction
#5
Connor V Cunnane, Eoghan M Cunnane, Michael T Walsh
A vascular access (VA) is used to facilitate hemodialysis in patients that suffer from end-stage renal disease. However, they suffer from high failure rates due to non-maturation and venous stenosis, with intimal hyperplasia (IH) the underlying cause of both conditions. Abnormal hemodynamic profiles, which arise following VA creation, are believed to lead to the development of IH. However, the exact physiological response that initiates this process is unknown. This review evaluates the different hemodynamic parameters that are hypothesised to correlate with the development of IH...
May 19, 2017: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/28526628/heparin-based-hydrogels-induce-human-renal-tubulogenesis-in-vitro
#6
Heather M Weber, Mikhail V Tsurkan, Valentina Magno, Uwe Freudenberg, Carsten Werner
Dialysis or kidney transplantation is the only therapeutic option for end stage renal disease. Accordingly, there is a large unmet clinical need for new causative therapeutic treatments. Obtaining robust models that mimic the complex nature of the human kidney is a critical step in the development of new therapeutic strategies. Here we establish a synthetic in vitro human renal tubulogenesis model based on a tunable glycosaminoglycan-hydrogel platform. In this system, renal tubulogenesis can be modulated by the adjustment of hydrogel mechanics and degradability, growth factor signaling, and the presence of insoluble adhesion cues, potentially providing new insights for regenerative therapy...
May 16, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28524847/an-in-vivo-strategy-to-counteract-post-administration-anticoagulant-activity-of-azido-warfarin
#7
Sylvain Ursuegui, Marion Recher, Wojciech Krężel, Alain Wagner
Drugs, usually long acting and metabolically stable molecules, might be the source of adverse effects triggered by complex drug interactions, anaphylaxis and drug-induced coagulopathy. To circumvent this growing drug safety issue, we herein investigate the opportunity offered by bio-orthogonal chemistry for in vivo drug neutralization. We design a small-molecule anticoagulant drug (Warfarin) containing an azide group that acts as a safety pin. It allows drug deactivation and restoration of physiological coagulation via in vivo click reaction with a suitable cyclooctyne-based neutralizing agent...
May 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28522145/wnt-signaling-a-novel-pathway-regulating-blood-pressure-state-of-the-art-review
#8
REVIEW
Maen D Abou Ziki, Arya Mani
Recent antihypertensive trials show conflicting results on blood pressure (BP) targets in patient populations with different metabolic profiles, with lowest benefit from tight BP control observed in patients with type 2 diabetes mellitus. This paradox could arise from the heterogeneity of study populations and underscores the importance of precision medicine initiatives towards understanding and treating hypertension. Wnt signaling pathways and genetic variations in its signaling peptides have been recently associated with metabolic syndrome, hypertension and diabetes, generating a breakthrough for advancement of precision medicine in the field of hypertension...
May 4, 2017: Atherosclerosis
https://www.readbyqxmd.com/read/28510506/signaling-at-the-crossroads-matrix-derived-proteoglycan-and-reactive-oxygen-species-signaling
#9
Madalina-Viviana Nastase, Andrea Janicova, Malgorzata Wygrecka, Liliana Schaefer
SIGNIFICANCE: Proteoglycans (PGs), besides their structural contribution, have emerged as dynamic components that mediate a multitude of cellular events. The various roles of PGs are attributed to their structure, spatial localization, and ability to act as ligands and receptors. Reactive oxygen species (ROS) are small mediators, which are generated in physiological and pathological conditions. Besides their reactivity and ability to induce oxidative stress, a growing body of data suggests that ROS signaling is more relevant than direct radical damage in development of human pathologies...
May 16, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28509626/custom-compounded-bioidentical-hormone-therapy-why-so-popular-despite-potential-harm-the-case-against-routine-use
#10
M L'Hermite
Wide rejection of conventional hormone therapy (HT) after the initial publication of the Women's Health Initiative (WHI) led to unjustified use of custom-compounded bioidentical hormones. In the USA, it became an unregulated drug manufacturer industry in disguise, without proper control and making false claims and misleading advertisements. Manufacturing quality is not ensured. Unspecific harm from compounding has occurred on a large scale, such as deaths from infected products and end-stage renal failure plus carcinoma due to confusion between different Chinese herbs...
June 2017: Climacteric: the Journal of the International Menopause Society
https://www.readbyqxmd.com/read/28509114/implicating-the-potential-role-of-orexin-in-hypertension
#11
REVIEW
Monika Rani, Raghuvansh Kumar, Pawan Krishan
Orexins (orexin A and orexin B), neuropeptides of hypothalamic origin also known as hypocretins, have been well documented for regulating the different physiological functions including feeding, sleep wakefulness, stress, and reward. However, from the past few years, orexins have evolved as an emerging biomarker for various endocrine disorders including diabetes mellitus and obesity which ultimately leads to various cardiovascular risk factors. Orexins exist in two isoforms orexin A and orexin B and exert their effect by acting on the G protein-coupled receptors orexin 1 receptor (OX1R) and orexin 2 receptor (OX2R)...
May 16, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28500604/a-primer-to-angiotensin-peptide-isolation-stability-and-analysis-by-nano-liquid-chromatography-with-mass-detection
#12
Mariola Olkowicz, Stefan Chlopicki, Ryszard T Smolenski
The renin-angiotensin system (RAS) is an important element of cardiovascular and renal physiology and targeting the RAS by renin inhibitors, angiotensin (Ang) converting enzyme (ACE) inhibitors and Ang II type 1 receptor antagonists is effective in the treatment of hypertension, heart failure, and atherosclerosis. Quantification of Ang peptides is critical to establish the status of the RAS, but it is challenging due to low Ang peptides concentrations (fmol/mL or fmol/g), abundance of interfering substances, post sampling conversions, and difficulties with the specificity of the assay...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28500593/assessment-of-protein-carbonylation-and-protein-tyrosine-phosphatase-ptp-oxidation-in-vascular-smooth-muscle-cells-vsmcs-using-immunoblotting-approaches
#13
Sofia Tsiropoulou, Rhian M Touyz
Post-translational modification of proteins, such as phosphorylation and oxidation, plays a major role in cellular signaling by influencing protein structure and function. In vascular cells, in addition to influencing phosphorylation, angiotensin II (Ang II) induces oxidation of proteins, important in redox signaling in the cardiovascular and renal systems. The present chapter describes immunoblotting approaches to assess irreversible protein carbonylation and protein tyrosine phosphatase (PTPs) oxidation status in the proteome of vascular smooth muscle cells (VSMC)...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28498883/prognostic-significance-of-spot-urine-na-k-for-longitudinal-changes-in-blood-pressure-and-renal-function-the-nagahama-study
#14
Yasuharu Tabara, Yoshimitsu Takahashi, Kazuya Setoh, Takahisa Kawaguchi, Shinji Kosugi, Takeo Nakayama, Fumihiko Matsuda
BACKGROUND: Urinary sodium-to-potassium ratio (Na/K) represents a simple measure of sodium load and has been reported to be associated with blood pressure (BP) levels in a cross-sectional setting even with spot measurements. The aim of the present large-scale cohort study is to determine prognostic significance of spot urine Na/K for longitudinal changes in BP levels and renal function. METHODS: The present study population consisted of 7,063 individuals from the general population...
May 12, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/28497082/evaluation-of-selenium-on-kidney-function-following-ischemic-injury-in-rats-protective-effects-and-antioxidant-activity
#15
Amin Hasanvand, Abolfazl Abbaszadeh, Saeideh Darabi, Afshin Nazari, Mohammadreza Gholami, Ali Kharazmkia
Introduction: Renal dysfunction is caused by ischemia-reperfusion (I/R) injury, which is a common problem in kidney surgery or kidney transplantation. The human body consists of enormous complex antioxidant systems, which inquires adequate selenium (Se) absorption for normal physiologic function. It is known that Se has some antioxidant effects. Objectives: In the present research, effects of the Se on damages caused by I/R injury investigated. Materials and Methods: In this experimental research, four groups of rats (weighing 220±10 g) used, include control group, I/R group, healthy group treated with Se for two weeks, and I/R group with two-week Se treatment...
2017: Journal of Renal Injury Prevention
https://www.readbyqxmd.com/read/28497081/relationship-between-serum-irisin-glycemic-indices-and-renal-function-in-type-2-diabetic-patients
#16
Leila Mahmoodnia, Maryam Sadoughi, Ali Ahmadi, Marzieh Kafeshani
Introduction: Irisin is a novel peptide that plays notable role in human and animal biology and physiology. It has been reported that irisin may improve insulin resistance and related disturbances. Objectives: The aim of this investigation was to assess the relationship between serum irisin, glycemic indices, and renal function in diabetic subjects. Patients and Methods: In this cross-sectional study, a total of 102 type 2 diabetes mellitus (T2DM) patients were recruited. Blood biochemical parameters, including fasting plasma sugar (FBS), glycosylated hemoglobin (HbA1C), serum uric acid (sUA), creatinine concentration and glomerular filtration rate (GFR) were measured...
2017: Journal of Renal Injury Prevention
https://www.readbyqxmd.com/read/28495870/early-life-experience-drives-short-term-acclimation-of-metabolic-and-osmoregulatory-traits-in-the-leaf-eared-mouse
#17
G Cavieres, M Nuñez-Villegas, F Bozinovic, P Sabat
We studied the putative effect of early experience on the physiological flexibility of metabolic and osmoregulatory traits in the leaf-eared mouse Phyllotis darwini, an altricial rodent inhabiting seasonal mediterranean environments. Adult individuals were collected in central Chile and maintained in breeding pairs. Pups were isolated after weaning and acclimated to different temperature (cold or warm) and water availability (unrestricted and restricted) until adulthood. Subsequently, individuals were re-acclimated to the opposite treatment...
May 11, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28495567/transporters-involved-in-metformin-pharmacokinetics-and-treatment-response
#18
Xiaomin Liang, Kathleen M Giacomini
Metformin, widely used as first-line treatment for type 2 diabetes, exists primarily as a hydrophilic cation at physiological pHs. As such, membrane transporters play a substantial role in its absorption, tissues distribution, and renal elimination. Multiple organic cation transporters are determinants of the pharmacokinetics of metformin, and many of them are important in its pharmacological action, as mediators of metformin entry into target tissues. Further, a recent genomewide association study (GWAS) in a large multi-ethnic population implicated polymorphisms in SLC2A2, encoding the glucose transporter, GLUT2, as important determinants of response to metformin...
May 8, 2017: Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28495212/quantification-of-mouse-renal-perfusion-using-arterial-spin-labeled-mri-at-1%C3%A2-t
#19
Quyen N Do, Ananth J Madhuranthakam, Peter Bendel, Robert E Lenkinski
RATIONALE AND OBJECTIVES: Quantitative measurement of renal perfusion in murine models provides important information on the organ physiology and disease states. The 1-T desktop magnetic resonance imaging has a small footprint and a self-contained fringe field. This resultant flexibility in siting makes the system ideal for preclinical imaging research. Our objective was to evaluate the capability of the 1-T desktop magnetic resonance imaging to measure mouse renal perfusion without the administration of exogenous contrast agents...
May 8, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28494744/targeting-nrf2-in-the-protection-against-renal-disease
#20
Melania Guerrero Hue, Víctor Farré-Alins, Alejandra Palomino Antolín, Esther Parada, Alfonso Rubio-Navarro, Jesús Egido, Javier Egea, Juan Antonio Moreno
Renal disease is a serious health problem, with increasing incidence and prevalence. Oxidative stress and inflammation play a key role in the pathogenesis and progression of renal disease. Therefore, therapeutic approaches to decrease oxidative stress in this pathological should be of interest. The transcription factor Nrf2 (nuclear factor erythroid 2-related factor 2) is an emerging regulator of cellular resistance to oxidants. Nrf2 controls the basal and induced expression of a couple of cytoprotective genes that regulate the physiological and pathophysiological outcomes of oxidant exposure...
May 11, 2017: Current Medicinal Chemistry
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