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https://www.readbyqxmd.com/read/29790390/collecting-duct-principal-but-not-intercalated-cell-prorenin-receptor-regulates-renal-sodium-and-water-excretion
#1
Nirupama Ramkumar, Deborah Stuart, Elena Mironova, Nikita Abraham, Yang Gao, Shuping Wang, Jayalakshmi Lakshmipathi, James D Stockand, Donald E Kohan
The collecting duct is the predominant nephron site of prorenin and prorenin receptor (PRR) expression. We previously demonstrated that the collecting duct PRR regulates epithelial Na+ channel (ENaC) activity and water transport; however, which cell type is involved remains unclear. Herein, we examined the effects of principal cell (PC) or intercalated cell (IC) PRR deletion on renal Na+ and water handling. PC or IC PRR KO mice were obtained by crossing floxed PRR mice with mice harboring Cre recombinase under the control of the AQP2 or B-1 subunit of the H+ ATPase promoters, respectively...
May 23, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29785042/inducible-high-efficiency-crispr-cas9-targeted-gene-editing-and-precision-base-editing-in-african-trypanosomes
#2
Eva Rico, Laura Jeacock, Julie Kovářová, David Horn
The Cas9 endonuclease can be programmed by guide RNA to introduce sequence-specific breaks in genomic DNA. Thus, Cas9-based approaches present a range of novel options for genome manipulation and precision editing. African trypanosomes are parasites that cause lethal human and animal diseases. They also serve as models for studies on eukaryotic biology, including 'divergent' biology. Genome modification, exploiting the native homologous recombination machinery, has been important for studies on trypanosomes but often requires multiple rounds of transfection using selectable markers that integrate at low efficiency...
May 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29767557/polycystin-1-dysfunction-impairs-electrolyte-and-water-handling-in-a-renal-pre-cystic-mouse-model-for-adpkd
#3
Eric H J Verschuren, Sami G Mohammed, Wouter N Leonhard, Caro Overmars-Bos, Kimberly A M Veraar, Joost G J Hoenderop, René J M Bindels, Dorien J M Peters, Francisco J Arjona
The PKD1 gene encodes polycystin-1 (PC1), a mechanosensor triggering intracellular responses upon urinary flow sensing in kidney tubular cells. Mutations in PKD1 lead to autosomal dominant polycystic kidney disease (ADPKD). The involvement of PC1 in renal electrolyte handling remains unknown since renal electrolyte physiology in ADPKD patients has only been characterized in cystic ADPKD. We thus studied the renal electrolyte handling in inducible kidney-specific Pkd1 knockout (iKsp-Pkd1-/-) mice manifesting a pre-cystic phenotype...
May 16, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29718707/arginase-ii-negatively-regulates-renal-aquaporin-2-and-water-reabsorption
#4
Ji Huang, Jean-Pierre Montani, François Verrey, Eric Feraille, Xiu-Fen Ming, Zhihong Yang
Type-II l-arginine:ureahydrolase, arginase-II (Arg-II), is abundantly expressed in the kidney. The physiologic role played by Arg-II in the kidney remains unknown. Herein, we report that in mice that are deficient in Arg-II (Arg-II-/- ), total and membrane-associated aquaporin-2 (AQP2) protein levels were significantly higher compared with wild-type (WT) controls. Water deprivation enhanced Arg-II expression, AQP2 levels, and membrane association in collecting ducts. Effects of water deprivation on AQP2 were stronger in Arg-II-/- mice than in WT mice...
May 2, 2018: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29705579/melarsoprol-resistance-in-african-trypanosomiasis
#5
REVIEW
Alan H Fairlamb, David Horn
Arsenicals were introduced as monotherapies for the treatment of human African trypanosomiasis, or sleeping sickness, over 100 years ago. Toxicity has always been an issue but these drugs have proven to be both effective and quite durable. Unfortunately, melarsoprol-resistant parasites emerged as early as the 1970s and were widespread by the late 1990s. Resistance was due to mutations affecting an aquaglyceroporin (AQP2), a parasite solute and drug transporter. This is the only example of widespread drug resistance in trypanosomiasis patients for which the genetic basis is known...
April 25, 2018: Trends in Parasitology
https://www.readbyqxmd.com/read/29676801/prolonged-prenatal-hypoxia-selectively-disrupts-collecting-duct-patterning-and-postnatal-function-in-male-mouse-offspring
#6
Sarah L Walton, Reetu R Singh, Melissa H Little, Josephine Bowles, Joan Li, Karen M Moritz
KEY POINTS SUMMARY: In this study we investigated whether hypoxia during late pregnancy impairs kidney development in mouse offspring, and also whether this has long-lasting consequences affecting kidney function in adulthood. Hypoxia disrupted growth of the kidney, particularly the collecting duct network, in juvenile male offspring. By mid-late adulthood, these mice developed early signs of kidney disease, notably a compromised response to water deprivation. Female offspring showed no obvious signs of impaired kidney development and did not develop kidney disease, suggesting a underlying protection mechanism from the hypoxia insult...
April 20, 2018: Journal of Physiology
https://www.readbyqxmd.com/read/29650969/akaps-pka-disruptors-increase-aqp2-activity-independently-of-vasopressin-in-a-model-of-nephrogenic-diabetes-insipidus
#7
Fumiaki Ando, Shuichi Mori, Naofumi Yui, Tetsuji Morimoto, Naohiro Nomura, Eisei Sohara, Tatemitsu Rai, Sei Sasaki, Yoshiaki Kondo, Hiroyuki Kagechika, Shinichi Uchida
Congenital nephrogenic diabetes insipidus (NDI) is characterized by the inability of the kidney to concentrate urine. Congenital NDI is mainly caused by loss-of-function mutations in the vasopressin type 2 receptor (V2R), leading to impaired aquaporin-2 (AQP2) water channel activity. So far, treatment options of congenital NDI either by rescuing mutant V2R with chemical chaperones or by elevating cyclic adenosine monophosphate (cAMP) levels have failed to yield effective therapies. Here we show that inhibition of A-kinase anchoring proteins (AKAPs) binding to PKA increases PKA activity and activates AQP2 channels in cortical collecting duct cells...
April 12, 2018: Nature Communications
https://www.readbyqxmd.com/read/29607712/expression-of-aquaporins-mrnas-in-patients-with-otitis-media
#8
Su Young Jung, Sung Su Kim, Young Il Kim, Hyung-Sik Kim, Sang Hoon Kim, Seung Geun Yeo
OBJECTIVE: This study analyzed the associations between measured levels of aquaporin (AQP) mRNAs and clinical manifestations in patients with various types of otitis media (OM). METHODS: AQP1, 2, 3, 4, 5, 6, 8, and 10 mRNA levels were assayed by real-time PCR from 57 patients with chronic otitis media (COM), 24 patients with cholesteatomatous otitis media (choleOM), and 82 patients with otitis media with effusion (OME). The relationships of these mRNA levels with the presence of bacteria, the type of hearing loss, and clinical manifestations of OM types were evaluated...
April 1, 2018: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/29602131/effects-of-cholecalciferol-cholesterol-emulsion-on-renal-fibrosis-and-aquaporin-2-and-4-in-mice-with-unilateral-ureteral-obstruction
#9
Ning Liu, Yalin Zhang, Han Su, Jinrong Wang, Zuwang Liu, Juan Kong
There was evidence that 1,25(OH)2 D3 regulated aquaporin (AQP) 2 and 4 expression while ameliorating renal fibrosis. This study investigated whether cholecalciferol cholesterol emulsion (CCE), a precursor of 1,25(OH)2 D3 , has similar effects. The impact of CCE on renal fibrosis and AQP2 and AQP4 expression were studied in a unilateralureteral obstruction (UUO) mouse nephropathy model. CCE reduced both the extent of fibrosis and transforming growth factor (TGF)-β signaling compared with vehicle-treated UUO model controls...
March 27, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29600629/-effect-of-zhenwu-tang-on-regulating-of-avp-v2r-aqp2-pathway-in-nrk-52e-cells
#10
Xiao-Jie Zhou, Yu-Ting Bao, Hong-Shu Chen, Ling Xuan, Xue-Ming Chen, Jie-Ying Zhang, Yuan-Xiao Yang, Chang-Yu Li
This study was aimed to investigate the effect and mechanism of Zhenwu Tang on AVP-V2R-AQP2 pathway in NRK-52E cells in vitro . Forty eight male SD rats were randomly divided into eight groups with 6 animals in each group. Distilled water or 22.68 g·kg⁻¹·d⁻¹ Zhenwu Tang(calculated by raw drug dosage meter) was given by gavage. Blood samples were collected by cardiac puncture, and the medicated serum was centrifuged from the blood by 3 000 r·min⁻¹. NRK-52E cells were treated with different medicated serum or dDAVP...
February 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29592526/combination-exposure-of-melamine-and-cyanuric-acid-is-associated-with-polyuria-and-activation-of-nlrp3-inflammasome-in-rats
#11
Feifei Wang, Qiaojuan Liu, Lizi Jin, Shan Hu, Renfei Luo, Mengke Han, Yonggong Zhai, Weidong Wang, Chunling Li
The molecular mechanism of melamine-induced renal toxicity have not been fully understood. The purpose of the study aimed to investigate whether melamine and cyanuric acid induced NLRP3 inflammasome activation in the kidney, which may contribute to abnormal water and sodium handling in a rat model. Wistar rats were received melamine (Mel, 200 mg/kg BW/day), cyanuric acid (CA, 200 mg/kg BW/day), or Mel plus CA (Mel+CA, 100 mg/kg BW/day, each) for two weeks. Mel+CA caused damaged tubular epithelial structure and organelles, dilated tubular lumen, and inflammatory responses...
March 28, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29572403/genome-wide-mapping-of-dna-accessibility-and-binding-sites-for-creb-and-c-ebp-%C3%AE-in-vasopressin-sensitive-collecting-duct-cells
#12
Hyun Jun Jung, Viswanathan Raghuram, Jae Wook Lee, Mark A Knepper
Background Renal water excretion is controlled by vasopressin, in part through regulation of the transcription of the aquaporin-2 gene ( Aqp2 ). Methods To identify enhancer regions likely to be involved in the regulation of Aqp2 and other principal cell-specific genes, we used several next generation DNA-sequencing techniques in a well characterized cultured cell model of collecting duct principal cells (mpkCCD). To locate enhancers, we performed the assay for transposase-accessible chromatin using sequencing (ATAC-Seq) to identify accessible regions of DNA and integrated the data with data generated by chromatin immunoprecipitation followed by next generation DNA-sequencing (ChIP-Seq) for CCCTC binding factor (CTCF) binding, histone H3 lysine-27 acetylation, and RNA polymerase II...
May 2018: Journal of the American Society of Nephrology: JASN
https://www.readbyqxmd.com/read/29524884/steviol-slows-renal-cyst-growth-by-reducing-aqp2-expression-and-promoting-aqp2-degradation
#13
Rattikarn Noitem, Chaowalit Yuajit, Sunhapas Soodvilai, Chatchai Muanprasat, Varanuj Chatsudthipong
Overexpression of aquaporin 2 (AQP2) was observed and suggested to be involved in fluid secretion leading to cyst enlargement in polycystic kidney disease (PKD). The cyst expansion deteriorates the renal function and, therefore, therapies targeting cyst enlargement are of clinical interest. Of note, inhibition of vasopressin function using vasopressin 2 receptor (V2R) antagonist which decreased cAMP production along with AQP2 production and function can slow cyst growth in ADPKD. This finding supports the role of AQP2 in cyst enlargement...
May 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29502265/aquaporin1-regulates-development-secondary-metabolism-and-stress-responses-in-fusarium-graminearum
#14
Mingyu Ding, Jing Li, Xinyue Fan, Fang He, Xiaoyang Yu, Lei Chen, Shenshen Zou, Yuancun Liang, Jinfeng Yu
The Ascomycete fungus Fusarium graminearum, the causal agent of Fusarium head blight of wheat and barley, has become a predominant model organism for the study of fungal phytopathogens. Aquaporins (AQPs) have been implicated in the transport of water, glycerol, and a variety of other small molecules in yeast, plants and animals. However, the role of these proteins in phytopathogenic fungi is not well understood. Here, we identified and attempted to elucidate the function of the five aquaporin genes in F. graminearum...
March 3, 2018: Current Genetics
https://www.readbyqxmd.com/read/29478202/activation-of-aqp2-water-channels-without-vasopressin-therapeutic-strategies-for-congenital-nephrogenic-diabetes-insipidus
#15
REVIEW
Fumiaki Ando, Shinichi Uchida
Congenital nephrogenic diabetes insipidus (NDI) is characterized by defective urine concentrating ability. Symptomatic polyuria is present from birth, even with normal release of the antidiuretic hormone vasopressin by the pituitary. Over the last two decades, the aquaporin-2 (AQP2) gene has been cloned and the molecular mechanisms of urine concentration have been gradually elucidated. Vasopressin binds to the vasopressin type II receptor (V2R) in the renal collecting ducts and then activates AQP2 phosphorylation and trafficking to increase water reabsorption from urine...
February 24, 2018: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/29474507/pnpla3-association-with-alcoholic-liver-disease-in-a-cohort-of-heavy-drinkers
#16
Bhanu Prakash Kolla, Terry D Schneekloth, Joanna Biernacka, Vijay Shah, Konstantinos N Lazaridis, Jennifer Geske, Victor Karpyak
Aims: Prior studies have established variation at the PNPLA3gene to be associated with a risk of developing alcoholic liver disease (ALD). We attempt to replicate this finding and other potential genetic variations previously associated with ALD utilizing a case-control design in a cohort of subjects with alcohol use disorders. Short summary: This case-control study performed in a US clinical sample of heavy drinkers, replicates the previously reported association between ALD and rs738409 polymorphism in the PNPLA3gene in heavy drinkers...
February 21, 2018: Alcohol and Alcoholism: International Journal of the Medical Council on Alcoholism
https://www.readbyqxmd.com/read/29472315/prognostic-values-of-aquaporins-mrna-expression-in-human-ovarian-cancer
#17
Mandika Chetry, Saisai Li, Hailing Liu, Xiaoli Hu, Xueqiong Zhu
Aquaporins (AQPs), a family of transmembrane channel, are composed of 13 identified members (AQP0-12). Accumulating evidences reported that AQPs were correlated with various biological roles and represented a prognostic predictor in various cancer types. However, the prognostic value of AQPs expression in ovarian cancer remains unclear. Using 'Kaplan-Meier plotter' (KM plotter) online database, we explored the predictive prognostic value of individual AQPs members' mRNA expression to overall survival (OS) in different clinical data, such as histology, pathological grades, clinical stages, TP53 status, and applied chemotherapy in ovarian cancer patients...
April 27, 2018: Bioscience Reports
https://www.readbyqxmd.com/read/29449936/function-of-aquaporins-in-sepsis-a-systematic-review
#18
REVIEW
Katharina Rump, Michael Adamzik
Background: Sepsis is a common cause of death in intensive care units worldwide. Due to the high complexity of this immunological syndrome development of novel therapeutic strategies is urgent. Promising drug targets or biomarkers may depict aquaporins (AQPs) as they regulate crucial key mechanisms of sepsis. Main body: Here we report on base of the current literature that several AQPs are involved in different physiological processes of sepsis. In immune system mainly AQPs 3, 5 and 9 seem to be important, as they regulate the migration of different immune cells...
2018: Cell & Bioscience
https://www.readbyqxmd.com/read/29436285/m%C3%A3-ni%C3%A3-re-s-disease-pathophysiology-endolymphatic-sac-immunohistochemical-study-of-aquaporin-2-v2r-vasopressin-receptor-nkcc2-and-trpv4
#19
Marc-Henri Asmar, Louis Gaboury, Issam Saliba
Objectives Endolymphatic sac (ELS) pathophysiology in Ménière's disease (MD) remains poorly understood. We identified from the literature a group of proteins expressed on the ELS and involved in endolymph volume regulation: aquaporin-2 (AQP2), vasopressin receptor V2R, sodium potassium chloride cotransporter 2 (NKCC2), and transient receptor potential cation channel V4 (TRPV4). Our objective was to determine whether their ELS expression was altered in MD, to better understand the pathophysiology of endolymphatic hydrops...
April 2018: Otolaryngology—Head and Neck Surgery
https://www.readbyqxmd.com/read/29420817/glutamine-metabolism-via-glutaminase-1-in-autosomal-dominant-polycystic-kidney-disease
#20
Irfana Soomro, Ying Sun, Zhai Li, Lonnette Diggs, Georgia Hatzivassiliou, Ajit G Thomas, Rana Rais, Barbara S Slusher, Stefan Somlo, Edward Y Skolnik
Background: Metabolism of glutamine by glutaminase 1 (GLS1) plays a key role in tumor cell proliferation via the generation of ATP and intermediates required for macromolecular synthesis. We hypothesized that glutamine metabolism also plays a role in proliferation of autosomal-dominant polycystic kidney disease (ADPKD) cells and that inhibiting GLS1 could slow cyst growth in animal models of ADPKD. Methods: Primary normal human kidney and ADPKD human cyst-lining epithelial cells were cultured in the presence or absence of two pharmacologic inhibitors of GLS1, bis-2-(5-phenylacetamido-1,2,4-thiadiazol-2-yl)ethyl sulfide 3 (BPTES) and CB-839, and the effect on proliferation, cyst growth in collagen and activation of downstream signaling pathways were assessed...
February 5, 2018: Nephrology, Dialysis, Transplantation
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