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https://www.readbyqxmd.com/read/29775892/microrna-135a-inhibits-cardiac-fibrosis-induced-by-isoproterenol-via-trpm7-channel
#1
Yan Wu, Yonghui Liu, Yitong Pan, Chunxiao Lu, Haonan Xu, Xiaozhi Wang, Tingting Liu, Kai Feng, Yiqun Tang
BACKGROUND: Cardiac fibrosis is a crucial factor of heart failure. It has been reported that several microRNAs (miRNAs, miRs) were involved in cardiac fibrosis, however, the role and possible regulatory mechanism of microRNA-135a (miR-135a) in cardiac fibrosis have not been investigated. Here, we explored the regulation mechanism of miR-135a on cardiac fibrosis. METHODS AND RESULTS: In vitro, cardiac fibroblasts (CFs) from neonatal rats were treated by isoproterenol (ISO) at the final concentration of 10 μM for 24 h and miR-135a expression was decreased obviously...
May 15, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29705934/exosomes-secreted-by-adipose-derived-stem-cells-contribute-to-angiogenesis-of-brain-microvascular-endothelial-cells-following-oxygen-glucose-deprivation-in-vitro-through-microrna-181b-trpm7-axis
#2
Yujia Yang, Yue Cai, Yuan Zhang, Juan Liu, Zhiqiang Xu
Adipose-derived stem cells (ADSCs) have been demonstrated to promote cerebral vascular remodeling processes after stroke. However, the exact molecular mechanism by which ADSCs exert protective roles in ischemic stroke is still poorly understood. In this study, we identified the role of exosomal microRNA-181b-5p (181b-Exos) in regulating post-stroke angiogenesis. The results of migration assay and capillary network formation assay showed that exosomes secreted by ADSCs (ADSCs-Exos) promoted the mobility and angiogenesis of brain microvascular endothelial cells (BMECs) after oxygen-glucose deprivation (OGD)...
April 29, 2018: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/29684587/trpm7-controls-mesenchymal-features-of-breast-cancer-cells-by-tensional-regulation-of-sox4
#3
Arthur J Kuipers, Jeroen Middelbeek, Kirsten Vrenken, Carlos Pérez-González, Geert Poelmans, Jeffrey Klarenbeek, Kees Jalink, Xavier Trepat, Frank N van Leeuwen
Mechanically induced signaling pathways are important drivers of tumor progression. However, if and how mechanical signals affect metastasis or therapy response remains poorly understood. We previously found that the channel-kinase TRPM7, a regulator of cellular tension implicated in mechano-sensory processes, is required for breast cancer metastasis in vitro and in vivo. Here, we show that TRPM7 contributes to maintaining a mesenchymal phenotype in breast cancer cells by tensional regulation of the EMT transcription factor SOX4...
April 20, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29672725/down-regulated-expression-of-magnesium-transporter-genes-following-a-high-magnesium-diet-attenuates-sciatic-nerve-crush-injury
#4
Ying-Ju Chen, Fu-Chou Cheng, Chun-Jung Chen, Hong-Lin Su, Meei-Ling Sheu, Jason Sheehan, Hung-Chuan Pan
BACKGROUND: Magnesium supplementation has potential for use in nerve regeneration. The expression of some magnesium transporter genes is reflective of the intracellular magnesium levels. OBJECTIVE: To assess the expression of various magnesium transporter genes as they relate to neurological alterations in a sciatic nerve injury model. METHODS: Sciatic nerve injury was induced in rats, which were then fed either basal or high magnesium diets...
April 17, 2018: Neurosurgery
https://www.readbyqxmd.com/read/29615639/trpm7-in-chbp-induced-renoprotection-upon-ischemia-reperfusion-related-injury
#5
Aifen Liu, Jing Wu, Cheng Yang, Yuanyuan Wu, Yufang Zhang, Fengbo Zhao, Hui Wang, Li Yuan, Lirui Song, Tongyu Zhu, Yaping Fan, Bin Yang
Transient receptor potential melastatin 7 (TRPM7) is a membrane ion channel and kinase. TRPM7 was abundantly expressed in the kidney, and up-regulated by ischemia reperfusion (IR) injury. Our previous studies showed that cyclic helix B peptide (CHBP) improved renal IR-related injury, but its underlying mechanism is not well defined. IR-related injury was established in renal tubular epithelial cells (TCMK-1 and HK-2) via 12 to 24-h hypoxia (H) followed by 2-24 h reoxygenation (R), and in mouse kidneys subjected to 30-min ischemia and 12-h to 7-day reperfusion...
April 3, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29566267/tadalafil-attenuates-hypotonicity-induced-ca-2-influx-via-trpv2-and-trpv4-in-primary-rat-bladder-urothelial-cell-cultures
#6
Xiao Dong, Hiroshi Nakagomi, Tatsuya Miyamoto, Tatsuya Ihara, Satoru Kira, Norifumi Sawada, Takahiko Mitsui, Masayuki Takeda
AIMS: To investigate the localization of phosphodiesterase 5 (PDE5) and the molecular mechanism underlying the effect of the PDE5 inhibitor tadalafil in signal transduction in the bladder urothelium. METHODS: PDE5 expression in rat bladder tissues and cultured primary rat bladder urothelial cells was evaluated using immunochemistry and western blot assays. Ca2+ influx in cells exposed to isotonic solution, hypotonic solution, a selective transient receptor potential vanilloid 2 (TRPV2) channel agonist (cannabidiol), a selective TRPV4 channel agonist (GSK1016790A), a TRP cation channel melastatin 7 (TRPM7) channel agonist (PIP2), or a purinergic receptor agonist (ATP) in the presence or absence of 10 µM tadalafil was evaluated using calcium imaging techniques...
March 22, 2018: Neurourology and Urodynamics
https://www.readbyqxmd.com/read/29554498/an-insight-into-the-role-of-magnesium-in-the-immunomodulatory-properties-of-mesenchymal-stem-cells
#7
Fabiana da Silva Lima, Amanda Batista da Rocha Romero, Araceli Hastreiter, Amanda Nogueira-Pedro, Edson Makiyama, Célia Colli, Ricardo Ambrósio Fock
Magnesium (Mg2+ ) is a mineral with the ability to influence cell proliferation and to modulate inflammatory/immune responses, due to its anti-inflammatory properties. In addition, mesenchymal stem cells (MSCs) modulate the function of all major immune cell populations. Knowing that, the current work aimed to investigate the effects of Mg2+ enrichment, and its influence on the immunomodulatory capacity of MSCs. Murine C3H/10T1/2 MSCs were cultivated in media with different concentrations of Mg2+ (0, 1, 3 and 5 mM), in order to evaluate the effects of Mg2+ on MSC immunomodulatory properties, cell proliferation rates, expression of NFκB and STAT-3, production of IL-1β, IL-6, TGF-β, IL-10, PGE2 and NO, and TRPM7 expression...
February 13, 2018: Journal of Nutritional Biochemistry
https://www.readbyqxmd.com/read/29545479/trpm7-regulates-akt-foxo1-dependent-tumor-growth-and-is-an-independent-prognostic-indicator-in-renal-cell-carcinoma
#8
Zhijian Zhao, Mengping Zhang, Xiaolu Duan, Yiwen Chen, Ermao Li, Lianmin Luo, Wenqi Wu, Zhenwei Peng, Huijuan Qiu, Guohua Zeng
Transient receptor potential melastatin 7 (TRPM7) is important for the tumorigenesis and progression of several cancers. However, little is known about TRPM7 expression and its clinical significance in clear cell renal cell carcinoma (ccRCC). The expression dynamics of TRPM7 was examined in a clinical cohort of RCC specimens by qPCR, immunoblotting, and IHC staining. A series of in vitro and in vivo assays were performed to elucidate the function of TRPM7 in RCC and the underlying mechanisms. For the first time, results demonstrate that TRPM7 expression is markedly higher in RCC cell lines and clinical samples and had a positive correlation with T status, tumor size, and poor patients' overall survival and progression-free survival...
March 15, 2018: Molecular Cancer Research: MCR
https://www.readbyqxmd.com/read/29515374/trpv6-trpm6-and-trpm7-do-not-contribute-to-hair-cell-mechanotransduction
#9
Clive P Morgan, Hongyu Zhao, Meredith LeMasurier, Wei Xiong, Bifeng Pan, Piotr Kazmierczak, Matthew R Avenarius, Michael Bateschell, Ruby Larisch, Anthony J Ricci, Ulrich Müller, Peter G Barr-Gillespie
Hair cells of the inner ear transduce mechanical stimuli like sound or head movements into electrical signals, which are propagated to the central nervous system. The hair-cell mechanotransduction channel remains unidentified. We tested whether three transient receptor channel (TRP) family members, TRPV6, TRPM6 and TRPM7, were necessary for transduction. TRPV6 interacted with USH1C (harmonin), a scaffolding protein that participates in transduction. Using a cysteine-substitution knock-in mouse line and methanethiosulfonate (MTS) reagents selective for this allele, we found that inhibition of TRPV6 had no effect on transduction in mouse cochlear hair cells...
2018: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29511803/trpm7-regulates-angiotensin-ii-induced-sinoatrial-node-fibrosis-in-sick-sinus-syndrome-rats-by-mediating-smad-signaling
#10
Hongbin Zhong, Tingjun Wang, Guili Lian, Changsheng Xu, Huajun Wang, Liangdi Xie
Sinoatrial node fibrosis is involved in the pathogenesis of sinus sick syndrome (SSS). Transient receptor potential (TRP) subfamily M member 7 (TRPM7) is implicated in cardiac fibrosis. However, the mechanisms underlying the regulation of sinoatrial node (SAN) fibrosis in SSS by TRPM7 remain unknown. The aim of this study was to investigate the role of angiotensin II (Ang II)/TRPM7/Smad pathway in the SAN fibrosis in rats with SSS. The rat SSS model was established with sodium hydroxide pinpoint pressing permeation...
March 6, 2018: Heart and Vessels
https://www.readbyqxmd.com/read/29500887/tgf%C3%AE-induced-epithelial-to-mesenchymal-transition-in-prostate-cancer-cells-is-mediated-via-trpm7-expression
#11
Yuyang Sun, Anne Schaar, Pramod Sukumaran, Archana Dhasarathy, Brij B Singh
Growth factors, such as the transforming growth factor beta (TGFβ), play an important role in promoting metastasis of prostate cancer, thus understanding how TGFβ could induce prostate cancer cell migration may enable us to develop targeted strategies for treatment of advanced metastatic prostate cancer. To more clearly define the mechanism(s) involved in prostate cancer cell migration, we undertook a series of studies utilizing non-malignant prostate epithelial cells RWPE1 and prostate cancer DU145 and PC3 cells...
June 2018: Molecular Carcinogenesis
https://www.readbyqxmd.com/read/29500477/the-trpm7-kinase-limits-receptor-induced-calcium-release-by-regulating-heterotrimeric-g-proteins
#12
Sayuri Suzuki, Annette Lis, Carsten Schmitz, Reinhold Penner, Andrea Fleig
The melastatin-related transient receptor potential member 7 (TRPM7) is a unique fusion protein with both ion channel function and enzymatic α-kinase activity. TRPM7 is essential for cellular systemic magnesium homeostasis and early embryogenesis; it promotes calcium transport during global brain ischemia and emerges as a key player in cancer growth. TRPM7 channels are negatively regulated through G-protein-coupled receptor-stimulation, either by reducing cellular cyclic adenosine monophosphate (cAMP) or depleting phosphatidylinositol bisphosphate (PIP2 ) levels in the plasma membrane...
March 2, 2018: Cellular and Molecular Life Sciences: CMLS
https://www.readbyqxmd.com/read/29489440/trpm7-mediates-mechanosensitivity-in-adult-rat-odontoblasts
#13
J Won, H Vang, J H Kim, P R Lee, Y Kang, S B Oh
Odontoblasts, with their strategic arrangement along the outermost compartment of the dentin-pulp complex, have been suggested to have sensory function. In addition to their primary role in dentin formation, growing evidence shows that odontoblasts are capable of sensing mechanical stimulation. Previously, we found that most odontoblasts express TRPM7, the nonselective mechanosensitive ion channel reported to be critical in Mg2+ homeostasis and dentin mineralization. In line with this finding, we sought to elucidate the functional expression of TRPM7 in odontoblasts by pharmacological approaches and mechanical stimulation...
February 1, 2018: Journal of Dental Research
https://www.readbyqxmd.com/read/29445164/inactivation-of-trpm7-kinase-in-mice-results-in-enlarged-spleens-reduced-t-cell-proliferation-and-diminished-store-operated-calcium-entry
#14
Pavani Beesetty, Krystyna B Wieczerzak, Jennifer N Gibson, Taku Kaitsuka, Charles Tuan Luu, Masayuki Matsushita, J Ashot Kozak
T lymphocytes enlarge (blast) and proliferate in response to antigens in a multistep program that involves obligatory cytosolic calcium elevations. Store-operated calcium entry (SOCE) pathway is the primary source of Ca2+ in these cells. Here, we describe a novel modulator of blastogenesis, proliferation and SOCE: the TRPM7 channel kinase. TRPM7 kinase-dead (KD) K1646R knock-in mice exhibited splenomegaly and impaired blastogenic responses elicited by PMA/ionomycin or anti-CD3/CD28 antibodies. Splenic T-cell proliferation in vitro was weaker in the mutant compared to wildtype littermates...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29412701/the-rise-and-fall-of-novel-renal-magnesium-transporters
#15
Olivier J M Schäffers, Joost G J Hoenderop, René J M Bindels, J H F de Baaij
Body Mg2+ balance is finely regulated in the distal convoluted tubule (DCT), where a tight interplay between transcellular reabsorption, mitochondrial exchange and basolateral extrusion takes place. In the last decades, several research groups have aimed to identify the molecular players in these processes. A multitude of proteins have been proposed to function as Mg2+ transporter in eukaryotes based on phylogenetic analysis, differential gene expression and overexpression studies. However, functional evidence for many of these proteins is lacking...
February 7, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29391410/magnesium-prevents-vascular-calcification-in-vitro-by-inhibition-of-hydroxyapatite-crystal-formation
#16
Anique D Ter Braake, Paul T Tinnemans, Catherine M Shanahan, Joost G J Hoenderop, Jeroen H F de Baaij
Magnesium has been shown to effectively prevent vascular calcification associated with chronic kidney disease. Magnesium has been hypothesized to prevent the upregulation of osteoblastic genes that potentially drives calcification. However, extracellular effects of magnesium on hydroxyapatite formation are largely neglected. This study investigated the effects of magnesium on intracellular changes associated with transdifferentiation and extracellular crystal formation. Bovine vascular smooth muscle cells were calcified using β-glycerophosphate...
February 1, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29383689/magnesium-reduces-blood-brain-barrier-permeability-and-regulates-amyloid-%C3%AE-transcytosis
#17
Donghui Zhu, Yingchao Su, Bingmei Fu, Huaxi Xu
Poor Mg status is a risk factor for Alzheimer's disease (AD), and the underlying mechanisms remain elusive. Here, we provided the first evidence that elevated Mg levels significantly reduced the blood-brain barrier (BBB) permeability and regulated its function in vitro. Transient receptor potential melastatin 7 (TRPM7) and magnesium transporter subtype 1 (MagT1) were two major cellular receptors mediating entry of extracellular Mg2+ into the cells. Elevated Mg levels also induced an accelerated clearance of amyloid-β peptide (Aβ) from the brain to the blood side via BBB transcytosis through low-density lipoprotein receptor-related protein (LRP) and phosphatidylinositol binding clathrin assembly protein (PICALM), while reduced the influx of Aβ from the blood to the brain side involving receptor for advanced glycation end products (RAGE) and caveolae...
January 30, 2018: Molecular Neurobiology
https://www.readbyqxmd.com/read/29367228/trping-out-platelet-calcium-trpm7-transient-receptor-potential-melastatin-like-7-modulates-calcium-mobilization-and-platelet-function-via-phospholipase-c-interactions
#18
EDITORIAL
Anh T P Ngo, Owen J T McCarty, Joseph E Aslan
No abstract text is available yet for this article.
February 2018: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29352074/aldosterone-sgk1-and-ion-channels-in-the-kidney
#19
REVIEW
William C Valinsky, Rhian M Touyz, Alvin Shrier
Hyperaldosteronism, a common cause of hypertension, is strongly connected to Na+ , K+ , and Mg2+ dysregulation. Owing to its steroidal structure, aldosterone is an active transcriptional modifier when bound to the mineralocorticoid receptor (MR) in cells expressing the enzyme 11β-hydroxysteroid dehydrogenase 2, such as those comprising the aldosterone-sensitive distal nephron (ASDN). One such up-regulated protein, the ubiquitous serum and glucocorticoid regulated kinase 1 (SGK1), has the capacity to modulate the surface expression and function of many classes of renal ion channels, including those that transport Na+ (ENaC), K+ (ROMK/BK), Ca2+ (TRPV4/5/6), Mg2+ (TRPM7/6), and Cl- (ClC-K, CFTR)...
January 31, 2018: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29343440/chanzyme-trpm7-mediates-the-ca-2-influx-essential-for-lipopolysaccharide-induced-toll-like-receptor-4-endocytosis-and-macrophage-activation
#20
Michael S Schappe, Kalina Szteyn, Marta E Stremska, Suresh K Mendu, Taylor K Downs, Philip V Seegren, Michelle A Mahoney, Sumeet Dixit, Julia K Krupa, Eric J Stipes, Jason S Rogers, Samantha E Adamson, Norbert Leitinger, Bimal N Desai
Toll-like receptors (TLRs) sense pathogen-associated molecular patterns to activate the production of inflammatory mediators. TLR4 recognizes lipopolysaccharide (LPS) and drives the secretion of inflammatory cytokines, often contributing to sepsis. We report that transient receptor potential melastatin-like 7 (TRPM7), a non-selective but Ca2+ -conducting ion channel, mediates the cytosolic Ca2+ elevations essential for LPS-induced macrophage activation. LPS triggered TRPM7-dependent Ca2+ elevations essential for TLR4 endocytosis and the subsequent activation of the transcription factor IRF3...
January 16, 2018: Immunity
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