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https://www.readbyqxmd.com/read/29659618/vitamin-d-receptor-suppresses-proliferation-and-metastasis-in-renal-cell-carcinoma-cell-lines-via-regulating-the-expression-of-the-epithelial-ca2-channel-trpv5
#1
YongMing Chen, XinYu Liu, FaBiao Zhang, ShanFan Liao, XiYuan He, DeXiang Zhuo, HuaiBin Huang, YongYang Wu
We previously demonstrated that transient receptor potential vanilloid subfamily 5 (TRPV5) expression was decreased in renal cell carcinoma (RCC) compared with that in normal kidney tissues, a finding that was correlated with vitamin D receptor (VDR) expression, but further investigations is warranted. The aim of this study was to elucidate whether VDR could regulate the expression of TRPV5 and affect proliferation and metastasis in RCC. In this study, we used lentivirus to conduct the model of VDR overexpression and knockdown caki-1 and 786-O RCC cell lines in vitro...
2018: PloS One
https://www.readbyqxmd.com/read/29621761/transient-receptor-potential-channel-vanilloid-5-induces-chondrocyte-apoptosis-in-a-rat-osteoarthritis-model-through-the-mediation-of-ca2-influx
#2
Yingliang Wei, Dianbin Zheng, Xiaocheng Guo, Min Zhao, Linlin Gao, Lunhao Bai
BACKGROUND/AIMS: Chondrocyte apoptosis is the most common pathological feature in cartilage in osteoarthritis (OA). Transient receptor potential channel vanilloid 5 (TRPV5) is important in regulating calcium ion (Ca2+) influx. Accumulating evidences suggest that Ca2+ is a major intracellular second messenger that can trigger cell apoptosis. Therefore, we investigate the potential role of TRPV5 in mediating Ca2+ influx to promote chondrocyte apoptosis in OA. METHODS: The monoiodoacetic acid (MIA)-induced rat OA model was assessed by macroscopic and radiographic analyses...
March 29, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29604963/stim1-and-trpv4-regulate-fluid-flow-induced-calcium-oscillation-at-early-and-late-stages-of-osteoclast-differentiation
#3
Ping Li, Xueyan Bian, Chenglin Liu, Shurong Wang, Mengmeng Guo, Yingjie Tao, Bo Huo
Bone resorption is mainly mediated by osteoclasts (OCs), whose formation and function are regulated by intracellular Ca2+ oscillation. Our previous studies demonstrated that fluid shear stress (FSS) lead to Ca2+ oscillation through mechanosensitive cation-selective channels. However, the specific channels responsible for this FSS-induced Ca2+ oscillation remain unknown. In the present study, we examined the expression of several Ca2+ channels in OCs, including STIM1, ORAI1, TRPV1, TRPV4, TRPV5, and TRPV6, by western blotting and reverse transcription-polymerase chain reaction...
May 2018: Cell Calcium
https://www.readbyqxmd.com/read/29584409/the-structural-basis-of-calcium-dependent-inactivation-of-the-transient-receptor-potential-vanilloid-5-channel
#4
Fedir M Bokhovchuk, Neil Bate, Nadezhda V Kovalevskaya, Benjamin T Goult, Chris A E M Spronk, Geerten W Vuister
The Transient Receptor Potential Vanilloid Channel subfamily member 5 (TRPV5) is a highly selective calcium ion channel predominately expressed in the kidney epithelium that plays an essential role in calcium reabsorption from renal infiltrate. In order to maintain Ca2+ homeostasis, TRPV5 possesses a tightly regulated negative feedback mechanism, where the ubiquitous Ca2+-binding protein Calmodulin (CaM) directly binds to the intracellular TRPV5 C-terminus, thus regulating TRPV5. Here we report on the characterisation of the TRPV5 C-terminal CaM binding site and its interaction with CaM at an atomistic level...
March 27, 2018: Biochemistry
https://www.readbyqxmd.com/read/29505720/a-novel-mechanism-for-calmodulin-dependent-inactivation-of-transient-receptor-potential-vanilloid-6
#5
Neil Bate, Rachel E Caves, Simon P Skinner, Ben T Goult, Jaswir Basran, John S Mitcheson, Geerten W Vuister
The paralogues TRPV5 and TRPV6 belong to the vanilloid subfamily of the Transient Receptor Potential (TRP) superfamily of ion channels and both play an important role in overall Ca2+ homeostasis. The functioning of the channels centres on a tightly controlled Ca2+ -dependent feedback mechanism where the direct binding of the universal Ca2+ -binding protein calmodulin (CaM) to the channel's C-terminal tail is required for channel inactivation. We have investigated this interaction at the atomic level and propose that under basal cellular [Ca2+] CaM is constitutively bound to the channel's C-tail via CaM C-lobe only contacts...
March 5, 2018: Biochemistry
https://www.readbyqxmd.com/read/29476878/low-systemic-exposure-and-calcemic-effect-of-calcipotriol-betamethasone-ointment-in-rats-with-imiquimod-induced-psoriasis-like-dermatitis
#6
Kyosuke Satake, Toru Amano, Tadao Okamoto
Vitamin D3 (VD3 ) analogues-containing ointments are known to occasionally cause hypercalcemia in psoriasis patients, and the frequency of hypercalcemia is suggested to vary based on the VD3 analogue used. In this study, to address the differences in calcemic effects of VD3 -containing ointments, the calcemic effects of marketed VD3 -containing ointments, including calcipotriol (Cal), maxacalcitol (Max), tacalcitol (Tac), calcipotriol/betamethasone dipropionate (Cal/BDP) and maxacalcitol/betamethasone butyrate propionate (Max/BBP) ointments, were evaluated in a rat model of imiquimod-induced dermatitis...
February 21, 2018: European Journal of Pharmacology
https://www.readbyqxmd.com/read/29372030/changes-in-expression-of-klotho-affect-physiological-processes-diseases-and-cancer
#7
REVIEW
Nguyen Thi Xuan, Nong Van Hai
Klotho (KL) encodes a single-pass transmembrane protein and is predominantly expressed in the kidney, parathyroid glands, and choroid plexus. Genetic studies on the KL gene have revealed that DNA hypermethylation is one of the major risk factors for aging, diseases, and cancer. Besides, KL exerts anti-inflammatory and anti-tumor effects by regulating signaling pathways and the expression of target genes. KL participates in modulation of the insulin/insulin-like growth factor-1 (IGF-1) signaling, which induces the growth hormone (GH) secretion...
January 2018: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/29357555/re-sarna-mediated-activation-of-trpv5-reduces-renal-calcium-oxalate-deposition-in-rat-via-decreasing-urinary-calcium-excretion
#8
Dean G Assimos
No abstract text is available yet for this article.
February 2018: Journal of Urology
https://www.readbyqxmd.com/read/29323279/structural-basis-of-trpv5-channel-inhibition-by-econazole-revealed-by-cryo-em
#9
Taylor E T Hughes, David T Lodowski, Kevin W Huynh, Aysenur Yazici, John Del Rosario, Abhijeet Kapoor, Sandip Basak, Amrita Samanta, Xu Han, Sudha Chakrapani, Z Hong Zhou, Marta Filizola, Tibor Rohacs, Seungil Han, Vera Y Moiseenkova-Bell
The transient receptor potential vanilloid 5 (TRPV5) channel is a member of the transient receptor potential (TRP) channel family, which is highly selective for Ca2+ , that is present primarily at the apical membrane of distal tubule epithelial cells in the kidney and plays a key role in Ca2+ reabsorption. Here we present the structure of the full-length rabbit TRPV5 channel as determined using cryo-EM in complex with its inhibitor econazole. This structure reveals that econazole resides in a hydrophobic pocket analogous to that occupied by phosphatidylinositides and vanilloids in TRPV1, thus suggesting conserved mechanisms for ligand recognition and lipid binding among TRPV channels...
January 2018: Nature Structural & Molecular Biology
https://www.readbyqxmd.com/read/28839241/leukocyte-trp-channel-gene-expressions-in%C3%A2-patients-with-non-valvular-atrial-fibrillation
#10
Irfan V Düzen, Fethi Yavuz, Ertan Vuruskan, Erhan Saracoglu, Fatih Poyraz, Hüseyin Göksülük, Basar Candemir, Seniz Demiryürek
Atrial fibrillation (AF) is the most common arrhythmia in clinical practice and is a major cause of morbidity and mortality. The upregulation of TRP channels is believed to mediate the progression of electrical remodelling and the arrhythmogenesis of the diseased heart. However, there is limited data about the contribution of the TRP channels to development of AF. The aim of this study was to investigate leukocyte TRP channels gene expressions in non-valvular atrial fibrillation (NVAF) patients. The study included 47 NVAF patients and 47 sex and age matched controls...
August 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28776078/sarna-mediated-activation-of-trpv5-reduces-renal-calcium-oxalate-deposition-in-rat-via-decreasing-urinary-calcium-excretion
#11
Tao Zeng, Xiaolu Duan, Wei Zhu, Yang Liu, Wenqi Wu, Guohua Zeng
Hypercalciuria is a main risk factor for kidney stone  formation. TRPV5 is the gatekeeper protein for mediating calcium transport and reabsorption in the kidney. In the present study, we tested the effect of TRPV5 activation with small activating RNA (saRNA), which could induce gene expression by targeting the promoter of the gene, on ethylene glycol (EG)-induced calcium oxalate (CaOx) crystals formation in rat kidney. Five pairs of RNA activation sequences targeting the promoter of rat TRPV5 were designed and synthesized...
August 3, 2017: Urolithiasis
https://www.readbyqxmd.com/read/28656379/physiology-and-pathophysiology-of-the-plasminogen-system-in-the-kidney
#12
REVIEW
Per Svenningsen, Gitte Rye Hinrichs, Rikke Zachar, Rikke Ydegaard, Boye L Jensen
The plasminogen system is important for fibrinolysis in addition to tissue remodeling and inflammation with significance for kidney disease. The system consists of the circulating zymogen plasminogen (Plg) and the tissue- and urokinase-type plasminogen activators, tPA and uPA, expressed in the glomeruli, endothelium and tubular epithelium, respectively, and the inhibitors α2 -antiplasmin and plasminogen activator inhibitor-type1, PAI-1. Plasminogen is activated by surface receptors, some with renal expression: urokinase-type plasminogen activator receptor (uPAR), plasminogen receptor KT (Plg-RKT ), and tPA, most evident in the endothelium...
November 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28622163/novel-roles-for-mucin-1-in-the-kidney
#13
Mohammad M Al-Bataineh, Timothy A Sutton, Rebecca P Hughey
PURPOSE OF REVIEW: Recent studies in the kidney have revealed that the well characterized tumor antigen mucin 1 (MUC1/Muc1) also has numerous functions in the normal and injured kidney. RECENT FINDINGS: Mucin 1 is a transmembrane mucin with a robust glycan-dependent apical targeting signal and efficient recycling from endosomes. It was recently reported that the TRPV5 calcium channel is stabilized on the cell surface by galectin-dependent cross-linking to mucin 1, providing a novel mechanism for regulation of ion channels and normal electrolyte balance...
September 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/28618678/re-mucin-1-increases-renal-trpv5-activity-in-vitro-and-urinary-level-associates-with-calcium-nephrolithiasis-in-patients
#14
Dean G Assimos
No abstract text is available yet for this article.
July 2017: Journal of Urology
https://www.readbyqxmd.com/read/28614116/parathyroid-hormone-and-the-regulation-of-renal-tubular-calcium-transport
#15
Benjamin Ko
PURPOSE OF REVIEW: Renal tubule excretion of calcium is carefully and complexly regulated. At the center of this process, parathyroid hormone (PTH) is the chief regulator of renal calcium reabsorption. This review outlines our current understanding of PTH's effects on renal tubular calcium transport, focusing on the more recent discoveries beyond its direct regulation of epithelial Ca channel transient receptor potential vanilloid 5 (TRPV5) and looking at its interaction with sodium transport and the hormones fibroblast growth factor 23 (FGF23) and klotho...
September 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/28602864/nckx3-was-compensated-by-calcium-transporting-genes-and-bone-resorption-in-a-nckx3-ko-mouse-model
#16
Hyun Yang, Changhwan Ahn, Eun-Kyeong Shin, Ji-Sun Lee, Beum-Soo An, Eui-Bae Jeung
Gene knockout is the most powerful tool for determination of gene function or permanent modification of the phenotypic characteristics of an animal. Existing methods for gene disruption are limited by their efficiency, time required for completion and potential for confounding off-target effects. In this study, a rapid single-step approach to knockout of a targeted gene in mice using zinc-finger nucleases (ZFNs) was demonstrated for generation of mutant (knockout; KO) alleles. Specifically, ZFNs to target the sodium/calcium/potassium exchanger3 (NCKX3) gene in C57bl/6j were designed using the concept of this approach...
October 15, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28600880/klotho-lacks-an-fgf23-independent-role-in-mineral-homeostasis
#17
Olena Andrukhova, Jessica Bayer, Christiane Schüler, Ute Zeitz, Sathish K Murali, Sibel Ada, Jose M Alvarez-Pez, Alina Smorodchenko, Reinhold G Erben
Fibroblast growth factor-23 (FGF23) is a bone-derived hormone regulating vitamin D hormone production and renal handling of minerals by signaling through an FGF receptor/αKlotho (Klotho) receptor complex. Whether Klotho has FGF23-independent effects on mineral homeostasis is a controversial issue. Here, we aimed to shed more light on this controversy by comparing male and female triple knockout mice with simultaneous deficiency in Fgf23 and Klotho and a nonfunctioning vitamin D receptor (VDR) (Fgf23/Klotho/VDR) with double (Fgf23/VDR, Klotho/VDR, and Fgf23/Klotho) and single Fgf23, Klotho, and VDR mutants...
October 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28539338/expression-of-transcellular-and-paracellular-calcium-and-magnesium-transport-proteins-in-renal-and-intestinal-epithelia-during-lactation
#18
Megan R Beggs, Ida Appel, Per Svenningsen, Karsten Skjødt, R Todd Alexander, Henrik Dimke
Significant alterations in maternal calcium (Ca(2+)) and magnesium (Mg(2+)) balance occur during lactation. Ca(2+) is the primary divalent cation mobilized into breast milk by demineralization of the skeleton and alterations in intestinal and renal Ca(2+) transport. Mg(2+) is also concentrated in breast milk, but the underlying mechanisms are not well understood. To determine the molecular alterations in Ca(2+) and Mg(2+) transport in the intestine and kidney during lactation, three groups of female mice consisting of either nonpregnant controls, lactating mice, or mice undergoing involution were examined...
September 1, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28535500/transient-receptor-potential-vanilloid-5-mediates-ca2-influx-and-inhibits-chondrocyte-autophagy-in-a-rat-osteoarthritis-model
#19
Yingliang Wei, Yanfang Wang, Yutong Wang, Lunhao Bai
BACKGROUND: Autophagy, a self-protective mechanism of chondrocytes, has become a promising target to impede the progress of osteoarthritis (OA). Autophagy is regulated by cytosolic Ca2+ activity and may thus be modified by the Ca2+ permeable transient receptor potential channel vanilloid 5 (TRPV5). Therefore, we investigated the potential role of TRPV5 in mediating Ca2+ influx and in inhibiting chondrocyte autophagy in a rat OA model. METHODS: The rat OA model was assessed by macroscopic and histological analyses...
2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28534087/interspecies-differences-in-pth-mediated-pka-phosphorylation-of-the-epithelial-calcium-channel-trpv5
#20
Mark K van Goor, Sjoerd Verkaart, Teunis J van Dam, Martijn A Huynen, Jenny van der Wijst
The epithelial calcium (Ca(2+)) channel TRPV5 (transient receptor potential vanilloid 5) is expressed in the distal convoluted tubule of the kidney and facilitates active Ca(2+) reabsorption. This process is instrumental for the maintenance of Ca(2+) homeostasis. Therefore, all aspects of TRPV5 function are tightly regulated by the calciotropic parathyroid hormone (PTH). Rabbit (rb)TRPV5 channel activity was shown to be stimulated upon PTH-mediated protein kinase A (PKA) phosphorylation. Since there is incomplete conservation of the PKA consensus motif (RR/QxT) across species, the aim of this study was to extend these findings to humans and characterize the expression and function of human (h)TRPV5...
May 22, 2017: Pflügers Archiv: European Journal of Physiology
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