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Renal physiology

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https://www.readbyqxmd.com/read/28645281/sex-difference-in-the-risk-for-exercise-induced-albuminuria-correlates-with-hemoglobin-a1c-and-abnormal-exercise-ecg-test-findings
#1
Rafael Y Brzezinski, Inbal Etz-Hadar, Ayelet Grupper, Michal Ehrenwald, Itzhak Shapira, David Zeltser, Shlomo Berliner, Ori Rogowski, Roy Eldor, Shani Shenhar-Tsarfaty
BACKGROUND: Albuminuria is an established marker for endothelial dysfunction and cardiovascular risk in diabetes and prediabetes. Exercise induced albuminuria (EiA) appears earlier and may be a more sensitive biomarker for renal endothelial damage. We sought to examine the association between EiA, parameters of the metabolic syndrome, A1C levels, exercise ECG test results and sex related differences in a large cohort of healthy, pre-diabetic and diabetic subjects. METHODS: A total of 3029 participants from the Tel-Aviv Medical Center Inflammation Survey cohort (mean age 46 years, 73% men) were analyzed...
June 23, 2017: Cardiovascular Diabetology
https://www.readbyqxmd.com/read/28643350/habitual-sleep-and-kidney-function-in-chronic-kidney-disease-the-chronic-renal-insufficiency-cohort-study
#2
Kristen L Knutson, James Lash, Ana C Ricardo, James Herdegen, J D Thornton, Mahboob Rahman, Nicolas Turek, Janet Cohan, Lawrence J Appel, Lydia A Bazzano, Manjula K Tamura, Susan P Steigerwalt, Matthew R Weir, Eve Van Cauter
Physiological evidence suggests that sleep modulates kidney function. Our objective was to examine the cross-sectional association between kidney function and objectively-estimated habitual sleep duration, quality and timing in a cohort of patients with mild to moderate chronic kidney disease. This study involved two US clinical centers of the Chronic Renal Insufficiency Cohort (CRIC) study, including 432 participants in a CRIC ancillary sleep study. Habitual sleep duration, quality and timing were measured using wrist actigraphy for 5-7 days...
June 23, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28640982/mechanisms-of-sphingosine-1-phosphate-mediated-vasoconstriction-of-rat-afferent-arterioles
#3
Zhengrong Guan, Fuchenchu Wang, Xiangqin Cui, Edward W Inscho
AIM: Sphingosine-1-phosphate (S1P) influences resistance vessel function and is implicated in renal pathological processes. Previous studies revealed that S1P evoked potent vasoconstriction of the preglomerular microvasculature, but the underlying mechanisms remain incompletely defined. We postulated that S1P-mediated preglomerular microvascular vasoconstriction involves activation of voltage-dependent L-type calcium channels (L-VDCC) and the rho/rho kinase pathway. METHODS: Afferent arteriolar reactivity was assessed in vitro using the blood-perfused rat juxtamedullary nephron preparation and diameter was measured during exposure to physiological and pharmacological agents...
June 22, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28640960/ferulic-acid-alleviates-symptoms-of-preeclampsia-in-rats-by-upregulating-vascular-endothelial-growth-factor
#4
Weiyan Gong, Jipeng Wan, Qing Yuan, Quanzhan Man, Xiaojing Zhang
Preeclampsia is a complication affecting pregnant women worldwide, which leads to maternal and fetal morbidity and mortality. In this study, we evaluated the efficacy of ferulic acid (FA) on an N(ω) -nitro-L-arginine methyl ester hydrochloride (L-NAME) induced rat model of preeclampsia. L-NAME was administered to pregnant rats to induce preeclampsia. 48 rats were divided into three experimental groups (n=16 each): control group, preeclampsia group and preeclampsia with FA treatment (preeclampsia+FA). Physiological characteristics such as urine volume, total urine protein and blood pressure were assessed...
June 22, 2017: Clinical and Experimental Pharmacology & Physiology
https://www.readbyqxmd.com/read/28640449/polycystic-kidney-disease
#5
Joseph Ghata, Benjamin D Cowley
Renal cysts, which arise from renal tubules, can be seen in a variety of hereditary and nonhereditary entities. Common mechanisms associated with renal cyst formation include increased cell proliferation, epithelial fluid secretion, and extracellular matrix remodeling. Hereditary polycystic kidney disease (PKD) is seen as a component of numerous diseases. Autosomal dominant (AD) PKD is the most common potentially fatal hereditary disease in humans, causes renal failure in approximately 50% of affected individuals, and accounts for approximately 5% of end stage renal disease cases in the United States...
June 18, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28638822/extracellular-vesicles-in-renal-pathophysiology
#6
REVIEW
Margherita A C Pomatto, Chiara Gai, Benedetta Bussolati, Giovanni Camussi
Extracellular vesicles are a heterogeneous population of microparticles released by virtually all living cells which have been recently widely investigated in different biological fields. They are typically composed of two primary types (exosomes and microvesicles) and are recently commanding increasing attention as mediators of cellular signaling. Indeed, these vesicles can affect recipient cells by carrying and delivering complex cargos of biomolecules (including proteins, lipids and nucleic acids), protected from enzymatic degradation in the environment...
2017: Frontiers in Molecular Biosciences
https://www.readbyqxmd.com/read/28637675/structure-functional-aspects-of-the-human-riboflavin-transporter-3-slc52a3-role-of-the-predicted-glycosylation-and-substrate-interacting-sites
#7
Veedamali S Subramanian, Subrata Subai, Trevor Teafatiller, Jennifer A Bohl, Hamid M Said
The human riboflavin (RF) transporter-3 (hRFVT-3; product of the SLC52A3 gene) plays an essential role in the intestinal RF absorption process and is expressed exclusively at the apical membrane domain of polarized enterocytes. Previous studies have characterized different physiological/biological aspects of this transporter, but nothing is known about the glycosylation status of the hRFVT-3 protein and role of this modification in its physiology/biology. Additionally, little is known about the residues in the hRFVT-3 protein that interact with the ligand, RF...
June 21, 2017: American Journal of Physiology. Cell Physiology
https://www.readbyqxmd.com/read/28636800/molecular-dissection-of-smooth-septate-junctions-understanding-their-roles-in-arthropod-physiology
#8
REVIEW
Mikio Furuse, Yasushi Izumi
Smooth septate junctions (sSJs) are cell-cell junctions that are thought to regulate the paracellular pathway of the intestine and renal system in arthropods. The detailed mechanism of action of sSJs is not well understood, because their molecular organization has remained elusive for a long time. Recently, two sSJ-specific membrane proteins, Ssk and Mesh, were identified by screening monoclonal antibodies raised against sSJ-containing membrane fractions isolated from the silkworm midgut. Furthermore, a genetic screen in Drosophila based on microscopic observation of sSJ formation identified Tsp2A as a novel sSJ-specific membrane protein...
June 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28629959/glycemic-control-and-muscle-damage-in-3-athletes-with-type-1-diabetes-during-a-successful-performance-in-a-relay-ultramarathon-a-case-report
#9
Taisa Belli, Denise V de Macedo, Pedro P M Scariot, Gustavo G de Araújo, Ivan G M Dos Reis, Fernanda L Lazarim, Lázaro A S Nunes, René Brenzikofer, Claudio A Gobatto
Ultramarathon races are fairly demanding and impose substantial physiological stress on healthy athletes. These competitions may thus be considerably more challenging for individuals with diabetes. This case study aims to describe glycemic control, muscle damage, inflammation, and renal function in 3 athletes with type 1 diabetes during a successful performance in a relay ultramarathon. The team completed the race in 29 hours and 28 minutes, earning third place. The total distance covered by each athlete was 68...
June 16, 2017: Wilderness & Environmental Medicine
https://www.readbyqxmd.com/read/28629513/erythropoietin-and-hypothalamic-pituitary-axis
#10
Soumyadeep Dey, Constance T Noguchi
Erythropoietin (EPO), known primarily for its erythropoietic activity, is commonly used clinically to treat anemia of chronic kidney disease. However, the expression of EPO receptor (EpoR) beyond erythroid tissue provides for potential extrahematopoietic effects of EPO, including EPO regulation of metabolic homeostasis (Zhang et al., 2014). Small clinical studies have shown that EPO treatment in patients with end-stage renal disease improved glycemic control and insulin sensitivity. Studies in animal models have shown that EPO regulation of metabolism is mainly attributed to its response in fat, and the hypothalamus-pituitary axis (Dey et al...
2017: Vitamins and Hormones
https://www.readbyqxmd.com/read/28628361/lipocalin-2-an-emerging-player-in-iron-homeostasis-and-inflammation
#11
Xia Xiao, Beng San Yeoh, Matam Vijay-Kumar
Lipocalin 2 (Lcn2), an innate immune protein, has emerged as a critical iron regulatory protein during physiological and inflammatory conditions. As a bacteriostatic factor, Lcn2 obstructs the siderophore iron-acquiring strategy of bacteria and thus inhibits bacterial growth. As part of host nutritional immunity, Lcn2 facilitates systemic, cellular, and mucosal hypoferremia during inflammation, in addition to stabilizing the siderophore-bound labile iron pool. In this review, we summarize recent advances in understanding the interaction between Lcn2 and iron, and its effects in various inflammatory diseases...
June 19, 2017: Annual Review of Nutrition
https://www.readbyqxmd.com/read/28627693/renal-denervation-attenuates-cardiac-hypertrophy-in-spontaneously-hypertensive-rats-via-regulation-of-autophagy
#12
Jionghua Huang, He Huang, Wei Pan, Dejin Ou, Wenjun Dai, Yuhui Lin, Jinlei Wu, Wenjie Xie, Ximing Chen
It has been suggested that renal denervation (RD) may attenuate left ventricular (LV) hypertrophy. However, the role that autophagy serves in this process is currently unclear. In the present study, utilizing a model of hypertension‑induced cardiac hypertrophy in spontaneous hypertensive rats, it was demonstrated that RD was significantly associated with a reduction in LV hypertrophy. Furthermore, a decrease in the myocardial mRNA of hypertrophy‑associated genes was demonstrated in RD rats compared with sham controls...
June 15, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28625262/-predictive-value-of-sofa-score-combined-agi-grading-system-in-elderly-patients-with-sepsis-a-retrospective-analysis-with-91-patients
#13
Lingling Wang, Rui Chen, Zexun Mo, Jiahui Dong, Zhaokun Sun, Fei Xiao, Shaoting Hu, Richeng Xiong, Jie Sun, Zhou Yu, Zhenhui Guo
OBJECTIVE: To explore the predictive value of sequential organ failure assessment (SOFA) score combined the acute gastrointestinal injury (AGI) grading system in critical elderly patients with sepsis. METHODS: A retrospective analysis was conducted. Elderly patients with sepsis aged > 60 years admitted to medical intensive care unit (MICU) of General Hospital of Guangzhou Military Command from March 2014 to December 2015 and experiencing critical care over 48 hours were enrolled...
February 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28625257/-albumin-corrected-anion-gap-is-an-independent-risk-factor-for-long-term-mortality-of-patients-with-sepsis
#14
Xiaoli He, Xuelian Liao, Zhichao Xie, Chao Jiang, Yan Kang
OBJECTIVE: To explore whether albumin corrected anion gap (ACAG) is associated with long-term mortality of sepsis patients. METHODS: Adult patients with a diagnosis of sepsis within the first 24 hours (from December 2013 to December 2014) admitted to the intensive care unit (ICU) were included via the Sepsis database of West China Hospital Sichuan University. To record their long-term survival, patients were followed up by telephone interview one year after enrollment...
February 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28625235/-pharmacokinetics-of-vancomycin-in-patients-with-severe-acute-pancreatitis-and-its-influencing-factors-analysis-of-7-years-data
#15
Juan He, Enqiang Mao, Feng Jing, Huiting Jiang, Wanhua Yang, Erzhen Chen
OBJECTIVE: To observe the change of the serum trough concentration and its pharmacokinetics of vancomycin in patients with severe acute pancreatitis (SAP), and to analyze the factors influencing vancomycin concentration. METHODS: A retrospective analysis was conducted. Steady-state trough concentrations of vancomycin from patients (18-80 years old) with SAP concomitantly with G(+) infection admitted to Intensive Care Unit (ICU) of Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine from January 2010 to December 2016 were enrolled...
June 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28625233/-elevation-of-red-cell-distribution-width-during-hospitalization-predicts-mortality-in-patients-with-sepsis
#16
Yan Gong, Xianming Long, Jun Jin, Xinjing Yang, Jianhong Fu, Fang Huang, Jian Huang, Qiang Guo, Jun Wang
OBJECTIVE: To investigate the association of red cell distribution width (RDW) with prognosis in patients with sepsis. METHODS: Patients with sepsis admitted to intensive care unit (ICU) of the First Hospital of Soochow University from January 2011 to December 2016 were enrolled. All clinical data were collected for participants, which mainly included basic data, main underlying disease, site of infection, acute physiology and chronic health evaluation II(APACHE II) score, blood routine test, biochemical test, blood gas analysis, coagulation index, procalcitonin (PCT), hospitalization days, and 28-day and 90-day mortality...
June 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28624282/effect-of-endoplasmic-reticulum-stress-on-metabolic-and-stress-signaling-and-kidney-specific-functions-in-madin-darby-bovine-kidney-cells
#17
E Chiappisi, R Ringseis, K Eder, D K Gessner
Recent studies demonstrated induction of endoplasmic reticulum (ER) stress in tissues of cows after parturition, but knowledge about the effect of ER stress on important cellular processes, such as critical signaling and metabolic pathways, in cattle is scarce. Thus, the present study aimed to investigate the effect of ER stress induction on nuclear factor-κB (NF-κB), nuclear factor E2-related factor 2 (Nrf2), and sterol regulatory element-binding protein (SREBF1) pathway in Madin-Darby bovine kidney (MDBK) cells, a widely used in vitro model in ruminant research...
June 14, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28623232/the-ring-finger-and-pdz-domain-containing-protein-pdzrn3-controls-localization-of-the-mg-2-regulator-claudin-16-in-renal-tube-epithelial-cells
#18
Kana Marunaka, Chisa Furukawa, Naoko Fujii, Toru Kimura, Takumi Furuta, Toshiyuki Matsunaga, Satoshi Endo, Hajime Hasegawa, Naohiko Anzai, Yasuhiro Yamazaki, Masahiko Yamaguchi, Akira Ikari
Ion exchange in the renal tubules is fundamental to the maintenance of physiological ion levels. Claudin-16 (CLDN16) regulates the paracellular reabsorption of Mg(2+) in the thick ascending limb of Henle's loop in the kidney, with dephosphorylation of CLDN16 increasing its intracellular distribution and decreasing paracellular Mg(2+) permeability. CLDN16 is located in the tight junctions, but the mechanism regulating its localization is unclear. Using yeast two-hybrid systems, we found that CLDN16 binds to PDZRN3, a protein containing both RING-finger and PDZ-domains...
June 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28616218/soluble-klotho-may-be-a-marker-of-phosphate-reabsorption
#19
Sven-Jean Tan, Edward R Smith, Stephen G Holt, Tim D Hewitson, Nigel D Toussaint
Background: Membrane-bound α-klotho functions as a co-receptor with fibroblast growth factor receptor at the renal tubule conferring specificity to fibroblast growth factor-23 (FGF-23), allowing it to inhibit tubular phosphate reabsorption at physiological concentrations. α-klotho also exists as a soluble protein. However, the complex interrelationships between soluble α-klotho (sKl), FGF-23 and phosphate reabsorption are poorly understood, with little known about the links between sKl, FGF-23 and phosphate reabsorption in chronic kidney disease (CKD)...
June 2017: Clinical Kidney Journal
https://www.readbyqxmd.com/read/28615947/treatment-of-secondary-hyperparathyroidism-the-clinical-utility-of-etelcalcetide
#20
REVIEW
Mario Cozzolino, Andrea Galassi, Ferruccio Conte, Michela Mangano, Luca Di Lullo, Antonio Bellasi
Secondary hyperparathyroidism (SHPT), a very frequent, severe, and worsening complication of chronic kidney disease, is characterized by high serum parathyroid hormone (PTH), parathyroid gland hyperplasia, and disturbances in mineral metabolism. Clinically, SHPT shows renal osteodystrophy, vascular calcification, cardiovascular damage, and fatal outcome. Calcium-sensing receptor (CaSR) is the main physiological regulator of PTH secretion; its activation by calcium rapidly inhibits PTH. Another important player in regulating mineral metabolism is vitamin D receptor (VDR), which is under the influence of vitamin D and influences the intestinal absorption of calcium and phosphate, PTH gene expression, and bone calcium mobilization...
2017: Therapeutics and Clinical Risk Management
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