Abstract：
:The present study was performed to show the molecular identity of functionally characterized Mg transport pathways in rumen epithelial cells (REC) and to investigate the effects of extracellular [Mg] changes on their expression and activity. By using RT- PCR, Western blot, flow cytometry and immunocytochemistry, TRPM7, MagT1 and a Na+/Mg2+ exchanger were found in REC. Compared with control conditions ([Mg]e = 1.2 mM), a decreased or increased MagT1 (-30%; 20%) and Na+/Mg2+ exchanger (-25%; 40%) protein abundance was observed after a 24-h incubation of REC in low (0.12 mM)- and high (5 mM)-Mg medium, respectively. To determine the Mg transport capacity, [Mg2+]i changes were measured by use of mag-fura 2. The basal [Mg2]i (0.43 +/- 0.03 mM) was not influenced by the [Mg] of the pre-incubation medium. However, compared to control cells, REC incubated in low- or high-Mg medium showed significantly reduced (59%) and elevated (57%) Mg extrusion rates, respectively. In addition, they were characterized by an increased influx capacity (30-40%). In low-Mg cells the latter results mainly from a strong TRPM7 related transport component whereas in high-Mg cells the imipramine-sensitive, the Na+/Mg2+ exchanger-mediated transport component causes this effect. In conclusion, TRPM7, MagT1 and a Na+/Mg2+ exchanger are shown to be the main Mg transport proteins in REC and their expression and functional activity is influenced by the cellular Mg status. The latter responses permit adaptation of epithelial Mg absorption and enable REC to maintain a physiological [Mg2+]i which is a prerequisite for various cell functions.
journal_name
Magnes Resjournal_title
Magnesium researchauthors
Schweigel M,Kolisek M,Nikolic Z,Kuzinski Jsubject
Has Abstractpub_date
2008-06-01 00:00:00pages
118-23issue
2eissn
0953-1424issn
1952-4021journal_volume
21pub_type
杂志文章abstract：:The consequences of broad-scale alterations in magnesium (Mg2+) levels on learning and memory are poorly understood. We have recently demonstrated that adult male mice maintained on an Mg2+-deficient diet exhibit reduced conditional freezing behavior. The purpose of the present study was to determine if the detrimenta...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：2007-03-01 00:00:00
abstract：:The use of fluorescent indicators to quantify intracellular magnesium ([Mg(2+)]i) requires accurate determination of the dissociation constant (K(D)). Ideally, the K(D) should be determined intracellularly; however, in practice this is difficult to achieve. An alternative method is to measure the K(D) in solutions whi...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：1995-12-01 00:00:00
abstract：:Lactating rats fed a 0.055% Mg diet transferred 5.5 +/- SEM 0.3 mg per day of Mg into milk but remained in a slightly positive Mg balance by increasing both food consumption and fractional intestinal Mg absorption. Urinary Mg excretion increased continually during the course of lactation to values double those of non-...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：1989-12-01 00:00:00
abstract：UNLABELLED:Comprehensive analytical review of 44 human studies in 43 publications of oral Magnesium (Mg) therapy for hypertension (HT) shows Mg supplements may enhance the blood-pressure (BP) lowering effect of anti-hypertensive medications (medications) in Stage 1 HT subjects. 9 studies conducted on subjects treated w...
journal_title：Magnesium research
pub_type： 杂志文章
doi：10.1684/mrh.2010.0198
更新日期：2010-03-01 00:00:00
abstract：:The complex pressure wave (blast) generated by some explosions causes pulmonary pathological changes which resemble the histological findings of the adult respiratory distress syndrome (ARDS). The development of indirect neurotrauma following experimental pulmonary blast injury has been shown previously. The purpose o...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：1995-09-01 00:00:00
abstract：:The current study assessed the neuroprotective efficacy of magnesium using a FAST-Mag trial treatment protocol alone, and in combination with mild hypothermia, in Sprague Dawley rats subjected to permanent, middle cerebral artery occlusion (MCAO). Treatment with magnesium (MgSO4.7H2O) consisted of an intravenous loadi...
journal_title：Magnesium research
pub_type： 杂志文章
doi：10.1684/mrh.2013.0340
更新日期：2013-04-01 00:00:00
abstract：:The purpose of the research work was to study the influence of alpha-zearalenol on magnesium concentration in cellular subfractions of certain tissues of female rats and their progeny. Pregnant female rats received alpha-zearalenol at the doses of: 0.05, 0.5 or 1 mg x kg(-1) b.w. After delivery, brain, liver and kidne...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：2003-06-01 00:00:00
abstract：:Electrolyte abnormalities are a frequent and potentially hazardous complication in the treatment of patients with congestive heart failure. Medical treatment with diuretics and/or digitalis, as well as neurohumoral activation most likely initiated by the compromised cardiac function, contributes to this alteration. Th...
journal_title：Magnesium research
pub_type： 临床试验,杂志文章,随机对照试验
doi：
更新日期：1992-03-01 00:00:00
abstract：:Although magnesium (Mg) contents are different between breast milk and formula, few studies have investigated the blood Mg level in breast fed or formula fed preterm infants. We examined the influence of feeding type on serum Mg and whole blood ionized Mg (iMg) levels in preterm infants soon after birth. We included 1...
journal_title：Magnesium research
pub_type： 杂志文章
doi：10.1684/mrh.2019.0444
更新日期：2018-11-01 00:00:00
abstract：:To investigate the effects of sex hormones on bone histomorphometry, and bone density (BMD), 10 week old ovariectomized (OVX), orchiectomized (ORX), and sham-operated (SHAM) rats fed a moderately magnesium-deficient fructose diet were studied. One third of the OVX and ORX rats were injected with beta-oestradiol-3-benz...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：1996-03-01 00:00:00
abstract：:Mg2+ is known to influence conductance and gating properties of a multitude of ion channels and is thus able to modulate synaptic transmission. Therefore, a tight regulation of the intracellular free Mg2+ concentration ([Mg2+]i) in neurones and glial cells is crucial for maintaining the functions of central nervous sy...
journal_title：Magnesium research
pub_type： 杂志文章,评审
doi：
更新日期：2000-06-01 00:00:00
abstract：:Age-related human neurodegenerative diseases are a major social and medical problem. It is therefore logical to take into consideration every theory with an overall approach to neurodegenerative diseases. This environmental proposal relies mainly on data concerning the Western Pacific amyotrophic lateral sclerosis-Par...
journal_title：Magnesium research
pub_type： 杂志文章,评审
doi：
更新日期：1997-12-01 00:00:00
abstract：:We measured free intralymphocyte magnesium (Mgi) in 10 hypertensive subjects (HS) before and after treatment with atenolol (A) and in 16 normotensive control subjects (NC). We also carried out in vitro studies on human lymphocytes to test the effect of catecholamines and beta-antagonists on Mgi. Mgi in HS was not stat...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：1999-03-01 00:00:00
abstract：:Cerebral vasospasm and delayed cerebral ischemia remain an unsolved problem in patients with aneurysmal subarachnoid hemorrhage (SAH). In theory, high-dose magnesium sulfate (MgSO(4)) therapy offers vascular and neuroprotective benefits and is therefore currently under evaluation. The intensity of the inflammatory res...
journal_title：Magnesium research
pub_type： 临床试验,杂志文章
doi：
更新日期：2012-07-01 00:00:00
abstract：:Competitive divalent (magnesium and calcium) or monovalent (potassium, lithium and sodium) ion exchange and its influence on a membrane potential formation was studied at biological ligands (BL) such as adenosine triphosphate (ATP), asparagine (Asn) and glutamine (Gln) sites. The sites are dispersed electrochemically ...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：2009-03-01 00:00:00
abstract：:We have recently demonstrated in the guinea pig that preventive dietary magnesium supplement can significantly reduce impulse noise induced hearing loss by on average 18 dB. The purpose of the present study was to examine whether magnesium might also have a therapeutic effect on noise trauma. Anesthetized guinea pigs ...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：2002-03-01 00:00:00
abstract：:The sudden infant death syndrome (SIDS) remains a leading cause of death during the first year. The common epidemiological and pathological data which characterize SIDS include the curve for age at death (with 3 months as modal age), the stigmata of early maternal intrauterine injury, the seasonal predominance in wint...
journal_title：Magnesium research
pub_type： 杂志文章,评审
doi：
更新日期：1991-09-01 00:00:00
abstract：:In clinical practice diabetes mellitus is the most significant cause of hypomagnesemia and Mg depletion. The obese Zucker rat approaches non-insulin-dependent type II diabetes; lean Zucker rats being suitable controls. Using this disease model the influence of dietary Mg deficiency was studied: animals received a diet...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：2001-09-01 00:00:00
abstract：:The relation between histamine metabolism and an appearance of pinnal hyperaemia during magnesium (Mg) deficiency, and the effects of some factors on these were studied in 3-week-old Wistar rats. On a Mg-deficient diet (Mg 0.001%), the histamine concentrations in plasma and urine increased after 4-5 d, and reached a m...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：1988-12-01 00:00:00
abstract：:There is an important functional link between magnesium and calciotropic hormones. PTH stimulates magnesium reabsorption in the renal tubule, absorption in the gut and release of the ion from bone. Magnesium on the other hand is essential for the normal function of the parathyroid glands, metabolism of vitamin D and a...
journal_title：Magnesium research
pub_type： 杂志文章,评审
doi：
更新日期：1995-03-01 00:00:00
abstract：:The interaction of magnesium ions with biomolecular species is fundamental to the regulation of many biological processes. A mathematical technique to investigate such interactions is described. The concept of a pseudo-formation curve is discussed and the relevance and applicability of such constructions to the study ...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：1992-06-01 00:00:00
abstract：:Ageing is associated with a general decline in physiological functions. Amongst the different aspects of body deterioration, cognitive impairments, and particularly defects in learning and memory, represent one of the most frequent features in the elderly. However, a great variability exists among aged subjects. Clini...
journal_title：Magnesium research
pub_type： 杂志文章,评审
doi：
更新日期：2006-09-01 00:00:00
abstract：:A tight coupling between ionic currents, intracellular Ca2+ homeostasis, cytosolic [ADP] and deltaG of ATP hydrolysis underlies the regulation of cardiac cell function. As more experimental detail on the biochemistry and biophysics of these complex processes and their interactions accumulates, the intuitive interpreta...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：2008-03-01 00:00:00
abstract：:46 children, aged 2-6 years, with decreased magnesium concentrations in hair, were studied. Magnesium supplementation consisted of Asmag preparation for 3 months and multivitamin Multi-tabs preparation (containing magnesium, but without calcium) for the following 4 months. Control studies were performed again after 7 ...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：2001-03-01 00:00:00
abstract：OBJECTIVES:To examine the cross-sectional associations between serum magnesium (Mg) and hyperuricemia (HU). METHODS:2904 subjects were included in this study. HU was defined as uric acid ≥416 μmol/L for the male population and ≥360 μmol/L for the female population. A multivariable logistic analysis model was applied t...
journal_title：Magnesium research
pub_type： 杂志文章
doi：10.1684/mrh.2015.0384
更新日期：2015-06-01 00:00:00
abstract：:Catechol-O-methyltransferase (COMT) is a magnesium-dependent, catecholamine-metabolizing enzyme, whose impaired activity has been positively associated with cardiovascular diseases, particularly hypertension. Consumption of some natural mineral-rich waters has been shown to exert protective effects on cardiovascular r...
journal_title：Magnesium research
pub_type： 杂志文章
doi：10.1684/mrh.2014.0369
更新日期：2014-07-01 00:00:00
abstract：:A protein of approximately 70-kDa was identified as a candidate Na+/Mg2+ exchanger in rumen epithelial cells (REC). Melastatin-related Transient Receptor Potential 7 (TRPM7) and Magnesium Transporter 1 (MagT1) transcripts and, from them, encoded proteins were also detected. The regulation of these Mg transport pathway...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：2009-09-01 00:00:00
abstract：:Dependency on extracellular calcium influx in contractile response to noradrenaline has been investigated in the thoracic aorta isolated from dietary magnesium (Mg) deficient rats. Adult male Wistar rats were fed with a Mg deficient diet (0.001% Mg) for 30 days, together with control groups (0.07% Mg). The contractile...
journal_title：Magnesium research
pub_type： 杂志文章
doi：
更新日期：1989-09-01 00:00:00
abstract：BACKGROUND:Changes in plasma matrix metalloproteinase 9 (MMP-9) concentrations and parallel changes in brain magnesium homeostasis have not been examined in cardiac surgery patients. The purpose of the present study was to analyse these relationships in patients undergoing coronary artery bypass surgery (CABG) with ext...
journal_title：Magnesium research
pub_type： 杂志文章
doi：10.1684/mrh.2010.0219
更新日期：2010-12-01 00:00:00
abstract：:Calcium (Ca(2+)) and magnesium (Mg(2+)) are important metal elements that regulate a variety of cellular processes such as proliferation, migration, and apoptosis, in cancer cells. Among the ionic channels mediating intracellular entry, the transient receptor potential melastatin type 7 (TRPM7) channel is of particula...
journal_title：Magnesium research
pub_type： 杂志文章
doi：10.1684/mrh.2014.0367
更新日期：2014-07-01 00:00:00
