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Parathyroid hormone

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https://www.readbyqxmd.com/read/27908723/oxidation-inhibits-pth-receptor-signaling-and-trafficking
#1
Juan A Ardura, Verónica Alonso, Pedro Esbrit, Peter A Friedman
Reactive Oxygen Species (ROS) increase during aging, potentially affecting many tissues including brain, heart, and bone. ROS alter signaling pathways and constitute potential therapeutic targets to limit oxidative damaging effects in aging-associated diseases. Parathyroid hormone receptors (PTHR) are widely expressed and PTH is the only anabolic therapy for osteoporosis. The effects of oxidative stress on PTHR signaling and trafficking have not been elucidated. Here, we used Fluorescence Resonance Energy Transfer (FRET)-based cAMP, ERK, and calcium fluorescent biosensors to analyze the effects of ROS on PTHR signaling and trafficking by live-cell imaging...
November 28, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27905644/requests-of-laboratory-tests-for-the-diagnosis-and-management-of-calcium-phosphate-disorders-in-spain
#2
María Salinas, Maite López-Garrigós, Emilio Flores, Joaquín Uris, Carlos Leiva-Salinas
BACKGROUND: Knowledge about the variability in the request of calcium-phosphate metabolism laboratory tests in primary care is important to design strategies to improve health system efficiency. AIM: To compare the inter-practice variability in calcium-phosphate metabolism laboratory tests requested by general practitioners from diverse regions across Spain. MATERIAL AND METHODS: One hundred and forty one clinical laboratories were invited to participate in an observational cross-sectional study...
August 2016: Revista Médica de Chile
https://www.readbyqxmd.com/read/27905067/mathematical-model-of-bone-remodeling-captures-the-antiresorptive-and-anabolic-actions-of-various-therapies
#3
David S Ross, Khamir Mehta, Antonio Cabal
A better understanding of the molecular pathways regulating the bone remodeling process should help in the development of new antiresorptive regulators and anabolic regulators, that is, regulators of bone resorption and of bone formation. Understanding the mechanisms by which parathyroid hormone (PTH) influences bone formation and how it switches from anabolic to catabolic action is important for treating osteoporosis (Poole and Reeve in Curr Opin Pharmacol 5:612-617, 2005). In this paper we describe a mathematical model of bone remodeling that incorporates, extends, and integrates several models of particular aspects of this biochemical system (Cabal et al...
November 30, 2016: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/27904108/denosumab-is-effective-for-controlling-serum-calcium-levels-in-patients-with-humoral-hypercalcemia-of-malignancy-syndrome-a-case-report-on-parathyroid-hormone-related-protein-producing-cholangiocarcinoma
#4
Norihiro Ashihara, Koji Nakajima, Yoshiyuki Nakamura, Mutsuhiro Kobayashi, Kumiko Shirahata, Chika Maeda, Takeshi Uehara, Daisuke Gomi, Nobuo Ito
Hypercalcemia resulting in the elevation of serum parathyroid hormone-related protein (PTHrP) and suppression of serum PTH was observed in a patient with advanced cholangiocarcinoma (CCC) and multiple lymph node metastases. We confirmed humoral hypercalcemia of malignancy based on PTHrP-producing CCC. Chemotherapy with gemcitabine and cisplatin could not control the patient's serum PTHrP levels and the patient was affected with bisphosphonate-refractory hypercalcemia. We administered a single dose of denosumab, an anti-receptor activator of nuclear factor-kappaB ligand monoclonal antibody, and the patient's serum calcium levels remained close to the normal range for approximately 3 weeks without additional treatment...
2016: Internal Medicine
https://www.readbyqxmd.com/read/27903998/survival-benefit-of-hemodiafiltration-compared-with-prolonged-high-flux-hemodialysis
#5
Petar S Djuric, Aleksandar Jankovic, Jovan Popovic, Jelena Tosic Dragovic, Ana Bulatovic, Zivka Djuric, Milos Mitrovic, Nada Dimkovic
INTRODUCTION:  Patients on dialysis have a high rate of death, mainly of cardiovascular cause. Nephrologists are actively looking for ways to improve patients' outcomes, and alternative dialysis strategies, such as long conventional hemodialysis and hemodiafiltration, are currently being investigated. The aim of this study was to compare anemia, nutrition, inflammation, mineral metabolism, and 3-year survival rates between patients treated with hemodiafiltration and prolonged high-flux hemodialysis (HFH)...
November 2016: Iranian Journal of Kidney Diseases
https://www.readbyqxmd.com/read/27902586/neurological-psychological-and-cognitive-disorders-in-patients-with-chronic-kidney-disease-on-conservative-and-replacement-therapy
#6
Silvia Lai, Oriano Mecarelli, Patrizia Pulitano, Roberto Romanello, Leonardo Davi, Alessia Zarabla, Amalia Mariotti, Maria Carta, Giorgia Tasso, Luca Poli, Anna Paola Mitterhofer, Massimo Testorio, Nicla Frassetti, Paola Aceto, Alessandro Galani, Carlo Lai
Chronic kidney disease (CKD) is a highly prevalent condition in the world. Neurological, psychological, and cognitive disorders, related to CKD, could contribute to the morbidity, mortality, and poor quality of life of these patients. The aim of this study was to assess the neurological, psychological, and cognitive imbalance in patients with CKD on conservative and replacement therapy.Seventy-four clinically stable patients affected by CKD on conservative therapy, replacement therapy (hemodialysis (HD), peritoneal dialysis (PD)), or with kidney transplantation (KT) and 25 healthy controls (HC), matched for age and sex were enrolled...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27900961/efficacy-and-safety-of-calcium-acetate-magnesium-carbonate-in-the-treatment-of-hyperphosphatemia-in-dialysis-patients
#7
Imed Helal, Hanene Elkateb, Hafedh Hedri, Malika Hajri, Fethi Ben Hamida
A phosphate binder combining calcium and magnesium offers an interesting therapeutic option to control hyperphosphatemia in dialysis patients. We investigated the effectiveness and tolerance of calcium acetate-magnesium carbonate (Ca-Mg). This is a 16-week prospective study including 16 dialysis patients. After an initial two-week washout period, serum phosphorus (sPho) ≥1.8 mmol/L, serum calcium (sCa) ≤2.6 mmol/L, and serum magnesium ≤1.5 mmol/L were the main inclusion criteria. The initial dose of Ca-Mg depended on sPho level and was titrated for every two weeks to have a sPho ≤ 1...
November 2016: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/27900863/-symptomatic-and-asymptomatic-primary-hyperparathyroidism-in-outpatient-care-current-issues
#8
Helena Šiprová, Miroslav Souček, Zdeněk Fryšák, Květoslav Šipr
OBJECTIVE: To assess the diagnostic and therapeutic options in the care of patients with primary hyperparathyreosis in outpatient practice.Cohort and methods: The study included all the patients with primary hyperparathyroidism treated at the 2nd Internal Medicine Department, Masaryk University and the University Hospital of St. Anne in Brno in the period from Jan 1, 2008 to Dec 31, 2013. The sample consisted of 218 patients, including 41 men and 177 women. Patients with secondary hyperparathyroidism, especially patients with underlying hypovitaminosis D, renal insufficiency and those taking medications with possible effects on parathyroid hormone levels, have not been included in the study...
2016: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/27900648/etelcalcetide-first-global-approval
#9
Hannah A Blair
Etelcalcetide (Parsabiv™) is a novel second generation calcimimetic agent developed by Amgen for the treatment of secondary hyperparathyroidism (SHPT), a complication of chronic kidney disease (CKD). Etelcalcetide reduces circulating levels of parathyroid hormone and calcium by binding directly to the calcium-sensing receptor. Intravenous etelcalcetide has been approved in the EU for the treatment of SHPT in adult patients with CKD on haemodialysis therapy. Regulatory applications for etelcalcetide in SHPT are also under review in the USA and Japan...
November 29, 2016: Drugs
https://www.readbyqxmd.com/read/27900568/control-of-phosphate-balance-by-the-kidney-and-intestine
#10
REVIEW
Ichiro Kaneko, Sawako Tatsumi, Hiroko Segawa, Ken-Ichi Miyamoto
The prevention and correction of hyperphosphatemia are major goals of the treatment of chronic kidney disease (CKD)-bone mineral disorders, and thus, Pi balance requires special attention. Pi balance is maintained by intestinal absorption, renal excretion, and bone accretion. The kidney is mainly responsible for the plasma Pi concentration. In CKD, reduced glomerular filtration rate leads to various Pi metabolism abnormalities, and Pi absorption in the small intestine also has an important role in Pi metabolism...
November 30, 2016: Clinical and Experimental Nephrology
https://www.readbyqxmd.com/read/27899269/pixe-study-on-the-effects-of-parathyroid-hormone-on-elemental-content-in-rat-bones
#11
M H Eisa, H Shen, W Jin, Abdulaziz S Alaamer, M A Al-Rajhi, Hajo Idriss
Parathyroid hormone (PTH) has attracted considerable interest as a bone anabolic agent. PTH plays a central role in regulating calcium phosphate metabolism and its increases in production in response to low serum calcium levels. A continuous hypersecretion of PTH, as occurs in primary hyperparathyroidism, leads to bone resorption. In this study, the effect of different doses of parathyroid hormone (PTH) on bone mineral content (BMC) in rats was investigated by particle-induced X-ray emission (PIXE). This study will help in investigating further the toxicity of extremely high doses of PTH on BMC...
November 26, 2016: Physica Medica: PM
https://www.readbyqxmd.com/read/27898723/pth1r-mutants-found-in-patients-with-primary-failure-of-tooth-eruption-disrupt-g-protein-signaling
#12
Hariharan Subramanian, Frank Döring, Sina Kollert, Natalia Rukoyatkina, Julia Sturm, Stepan Gambaryan, Angelika Stellzig-Eisenhauer, Philipp Meyer-Marcotty, Martin Eigenthaler, Erhard Wischmeyer
AIM: Primary failure of tooth eruption (PFE) is causally linked to heterozygous mutations of the parathyroid hormone receptor (PTH1R) gene. The mutants described so far lead to exchange of amino acids or truncation of the protein that may result in structural changes of the expressed PTH1R. However, functional effects of these mutations have not been investigated yet. MATERIALS AND METHODS: In HEK293 cells, PTH1R wild type was co-transfected with selected PTH1R mutants identified in patients with PFE...
2016: PloS One
https://www.readbyqxmd.com/read/27896908/bixalomer-in-hyperphosphatemic-patients-with-chronic-kidney-disease-not-on-dialysis-phase-3-randomized-trial
#13
Tadao Akizawa, Hideki Origasa, Chisato Kameoka, Junko Tsukada, Kentarou Kuroishi, Yusuke Yamaguchi
Currently, calcium- or metal-containing phosphate binders are available to treat hyperphosphatemia in predialysis patients with chronic kidney disease. Bixalomer, a non-calcium, metal-free phosphate binder, has not been studied in these patients. We evaluated the efficacy and safety of bixalomer versus placebo for treatment of hyperphosphatemia in Japanese predialysis patients with chronic kidney disease. This multicenter, randomized, double-blind, phase 3 trial, randomized eligible patients 1:1 to receive bixalomer or placebo for 12 weeks...
November 29, 2016: Therapeutic Apheresis and Dialysis
https://www.readbyqxmd.com/read/27895794/trousseau-s-syndrome-caused-by-bladder-cancer-producing-granulocyte-colony-stimulating-factor-and-parathyroid-hormone-related-protein-a-case-report
#14
Tomonori Kato, Kenji Yasuda, Hiroaki Iida, Akihiko Watanabe, Yasuyoshi Fujiuchi, Shigeharu Miwa, Johji Imura, Akira Komiya
The present study reports a rare case of bladder cancer that caused Trousseau's syndrome, a malignancy-associated hypercoagulative state leading to venous or arterial thrombosis. A 38-year-old Japanese female patient experienced a sudden onset of visual field defects and lower limb weakness. Cerebral magnetic resonance imaging revealed multi-regional hypointense areas compatible with acute cerebral infarction. Despite the repeated administration of anticoagulant treatment with heparin, the condition could not be adequately controlled and thromboembolic events occasionally recurred...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27895472/safety-and-effectiveness-of-daily-teriparatide-for-osteoporosis-in-patients-with-severe-stages-of-chronic-kidney-disease-post-hoc-analysis-of-a-postmarketing-observational-study
#15
Atsushi Nishikawa, Fumito Yoshiki, Masanori Taketsuna, Kenta Kajimoto, Hiroyuki Enomoto
Teriparatide (recombinant 1-34 N-terminal sequence of human parathyroid hormone) for the treatment of osteoporosis should be prescribed with caution in patients with severe stages of chronic kidney disease (CKD). However, in clinical settings, physicians and surgeons who treat such patients have few available options. We sought to further explore the safety and effectiveness of teriparatide for the treatment of osteoporosis in Japanese patients with severe stages of CKD. This was a post hoc analysis of a postmarketing surveillance study that included patients with osteoporosis at high risk of fracture and stage 4 or 5 CKD...
2016: Clinical Interventions in Aging
https://www.readbyqxmd.com/read/27895088/hormonal-alterations-in-pcos-and-its-influence-on-bone-metabolism
#16
Abhaya Krishnan, Sridhar Muthusami
According to the World Health Organization (WHO) polycystic ovary syndrome (PCOS) occurs in 4-8% of women worldwide. The prevalence of PCOS in Indian adolescents is 12.2% according to ICMR (Indian Council of Medical Research) report. National Institute of Health documented that it affects approximately 5 million women of reproductive age in the United States . Hormonal imbalance is the characteristic of many women with polycystic ovarian syndrome. The impact of various endocrine changes in PCOS women and their relevance to bone remains to be documented...
November 28, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27894941/one-year-of-abaloparatide-a-selective-peptide-activator-of-the-pth1-receptor-increased-bone-mass-and-strength-in-ovariectomized-rats
#17
Aurore Varela, Luc Chouinard, Elisabeth Lesage, Robert Guldberg, Susan Y Smith, Paul J Kostenuik, Gary Hattersley
Abaloparatide is a novel 34 amino acid peptide selected to be a potent and selective activator of the parathyroid hormone receptor 1 (PTHR1) signaling pathway. The effects of 12months of abaloparatide treatment on bone mass, bone strength and bone quality was assessed in osteopenic ovariectomized (OVX) rats. SD rats were subjected to OVX or sham surgery at 6months of age and left untreated for 3months to allow OVX-induced bone loss. Eighteen OVX rats were sacrificed after this bone depletion period, and the remaining OVX rats received daily s...
November 25, 2016: Bone
https://www.readbyqxmd.com/read/27894216/bone-effects-of-canagliflozin-a-sodium-glucose-co-transporter-2-inhibitor-in-patients-with-type-2-diabetes-mellitus
#18
Thomas C Blevins, Azeez Farooki
Canagliflozin, a sodium glucose co-transporter 2 (SGLT2) inhibitor approved for the treatment of type 2 diabetes mellitus (T2DM), lowers blood glucose by inhibiting renal glucose reabsorption and increasing urinary glucose excretion. It has been reported that SGLT2 inhibitors may have potential adverse effects on bone, including increased fracture risk and decreased bone mineral density (BMD). Across clinical studies, canagliflozin was not associated with meaningful changes in serum or urine calcium, vitamin D, or parathyroid hormone...
November 28, 2016: Postgraduate Medicine
https://www.readbyqxmd.com/read/27893850/a-convenient-in-vivo-model-using-small-interfering-rna-silencing-to-rapidly-assess-skeletal-gene-function
#19
Wen Zhang, Can Liu, Bao Hai, Guohong Du, Hong Wang, Huijie Leng, Yingsheng Xu, Chunli Song
It is difficult to study bone in vitro because it contains various cell types that engage in cross-talk. Bone biologically links various organs, and it has thus become increasingly evident that skeletal physiology must be studied in an integrative manner in an intact animal. We developed a model using local intraosseous small interfering RNA (siRNA) injection to rapidly assess the effects of a target gene on the local skeletal environment. In this model, 160-g male Sprague-Dawley rats were treated for 1-2 weeks...
2016: PloS One
https://www.readbyqxmd.com/read/27890540/association-of-plasma-calcium-concentrations-with-alcohol-craving-new-data-on-potential-pathways
#20
Rilana Schuster, Anne Koopmann, Martin Grosshans, Iris Reinhard, Rainer Spanagel, Falk Kiefer
Recently, calcium was suggested to be the active moiety of acamprosate. We examined plasma calcium concentrations in association with severity of alcohol dependence and its interaction with regulating pathways and alcohol craving in alcohol-dependent patients. 47 inpatient alcohol-dependent patients undergoing detoxification treatment underwent laboratory testing, including calcium, sodium, liver enzymes as well as serum concentrations of calcitonin, parathyroid hormone and vitamin D. The psychometric dimension of craving was analyzed with the Obsessive Compulsive Drinking Scale (OCDS)...
November 24, 2016: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
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