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Parathyroid hormone related

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https://www.readbyqxmd.com/read/29774401/high-levels-of-serum-sclerostin-and-dkk1-in-a-case-of-klippel-tr%C3%A3-naunay-syndrome
#1
P Muto, A Lo Gullo, G Mandraffino, S Loddo, M Atteritano
Klippel-Trénaunay syndrome (KTS) is described as a complex syndrome characterized by various combinations of capillary, venous, and lymphatic malformations associated with bone and soft tissue hypertrophy. We report a case of a 67-year-old postmenopausal Caucasian women with KTS that shows elevated levels of sclerostin and Dickkopf-related protein 1 (DKK1). Dual-energy X-ray absorptiometry (DXA) BMD T-scores at lumbar spine and femur were normal. Serum calcium and phosphorus levels were consistently normal, 25-hydroxyvitamin D (25OHD) < 30 ng/mL, and normal parathyroid hormone (PTH)...
May 17, 2018: Osteoporosis International
https://www.readbyqxmd.com/read/29764395/longitudinal-changes-in-bone-and-mineral-metabolism-after-cessation-of-cinacalcet-in-dialysis-patients-with-secondary-hyperparathyroidism
#2
Irene Ruderman, Edward R Smith, Nigel D Toussaint, Tim D Hewitson, Stephen G Holt
BACKGROUND: The calcimimetic agent cinacalcet is effective for the management of secondary hyperparathyroidism (SHPT) in dialysis patients. Changes to reimbursement of cinacalcet in Australia provided an opportunity to assess effects of medication cessation on biochemical and clinical outcomes in dialysis patients, including changes to novel biomarkers such as calciprotein particles (CPP). CPP are nanoparticles of mineral and protein in the circulation associated with increased vascular calcification in patients with chronic kidney disease...
May 15, 2018: BMC Nephrology
https://www.readbyqxmd.com/read/29763365/effect-of-cross-linked-chitosan-iron-iii-on-vascular-calcification-in-uremic-rats
#3
Barbara Bruna Abreu de Castro, Wander Barros do Carmo, Paulo Giovani de Albuquerque Suassuna, Moises Carminatti, Julia Bianchi Brito, Wagner Vasques Dominguez, Ivone Braga de Oliveira, Vanda Jorgetti, Melani Ribeiro Custodio, Helady Sanders-Pinheiro
Cross-linked chitosan iron (III) is a chitin-derived polymer with a chelating effect on phosphorus, but it is untested in vascular calcification. We evaluated this compound's ability to reduce hyperphosphatemia and its effect on vascular calcification in uremic rats using an adenine-based, phosphorus-rich diet for seven weeks. We used a control group to characterize the uremia. Uremic rats were divided according the treatment into chronic kidney disease, CKD-Ch-Fe(III)CL (CKD-Ch), CKD-calcium carbonate, or CKD-sevelamer groups...
May 2018: Experimental Biology and Medicine
https://www.readbyqxmd.com/read/29743975/hypothyroidism-causes-endoplasmic-reticulum-stress-in-adult-rat-hippocampus-a-mechanism-associated-with-hippocampal-damage
#4
Alejandra Paola Torres-Manzo, Margarita Franco-Colín, Vanessa Blas-Valdivia, Marisol Pineda-Reynoso, Edgar Cano-Europa
Thyroid hormones (TH) are essential for hippocampal neuronal viability in adulthood, and their deficiency causes hypothyroidism, which is related to oxidative stress events and neuronal damage. Also, it has been hypothesized that hypothyroidism causes a glucose deprivation in the neuron. This study is aimed at evaluating the temporal participation of the endoplasmic reticulum stress (ERE) in hippocampal neurons of adult hypothyroid rats and its association with the oxidative stress events. Adult Wistar male rats were divided into euthyroid and hypothyroid groups...
2018: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/29726397/under-recognized-hypoparathyroidism-in-thalassemia
#5
Hataitip Tangngam, Pat Mahachoklertwattana, Preamrudee Poomthavorn, Ampaiwan Chuansumrit, Nongnuch Sirachainan, La-or Chailurkit, Patcharin Khlairit
OBJECTIVE: Symptomatic hypoparathyroidism [symptomatic hypocalcemia without elevated serum parathyroid hormone (PTH)] in patients with thalassemia is relatively rare. Asymptomatic mild hypocalcemia without elevated PTH which is considered hypoparathyroidism may be more common but under-recognized. METHODS: Sixty-six transfusion-dependent thalassemic patients, and 28 healthy controls were enrolled. Serum calcium (Ca), phosphate (P), creatinine (Cr), albumin, intact PTH, 25-hydroxyvitamin D (25-OHD), plasma intact fibroblast growth factor-23 (FGF-23), urine Ca, P and Cr were measured...
May 4, 2018: Journal of Clinical Research in Pediatric Endocrinology
https://www.readbyqxmd.com/read/29725715/fermented-dairy-products-consumption-is-associated-with-attenuated-cortical-bone-loss-independently-of-total-calcium-protein-and-energy-intakes-in-healthy-postmenopausal-women
#6
E Biver, C Durosier-Izart, F Merminod, T Chevalley, B van Rietbergen, S L Ferrari, R Rizzoli
A longitudinal analysis of bone microstructure in postmenopausal women of the Geneva Retirees Cohort indicates that age-related cortical bone loss is attenuated at non-bearing bone sites in fermented dairy products consumers, not in milk or ripened cheese consumers, independently of total energy, calcium, or protein intakes. INTRODUCTION: Fermented dairy products (FDP), including yogurts, provide calcium, phosphorus, and proteins together with prebiotics and probiotics, all being potentially beneficial for bone...
May 3, 2018: Osteoporosis International
https://www.readbyqxmd.com/read/29725706/abaloparatide-exerts-bone-anabolic-effects-with-less-stimulation-of-bone-resorption-related-factors-a-comparison-with-teriparatide
#7
Akito Makino, Hideko Takagi, Yoshimasa Takahashi, Naoki Hase, Hiroyuki Sugiyama, Kei Yamana, Tsunefumi Kobayashi
Abaloparatide (ABL) is a novel synthetic peptide analog of parathyroid hormone-related protein. In previous reports, intermittent ABL administration showed robust bone mineral density (BMD) increase and reduced the incidence of fractures in patients with osteoporosis, while its calcemic effect was reduced, as compared with teriparatide (TPTD), a parathyroid hormone N-terminal fragment. The present study aimed to elucidate the effects of ABL on bone anabolism and bone turnover as compared with TPTD. In ovariectomized (OVX) rats, ABL increased the bone strength and BMD of lumbar spine by intermittent administration similar to TPTD...
May 3, 2018: Calcified Tissue International
https://www.readbyqxmd.com/read/29721800/the-timing-of-parathyroid-hormone-measurement-defines-the-cut-off-values-to-accurately-predict-postoperative-hypocalcemia-a-prospective-study
#8
Eduardo Bardou Yunes Filho, Rafael Vaz Machry, Rodrigo Mesquita, Rafael Selbach Scheffel, Ana Luiza Maia
PURPOSE: Serum intact parathyroid hormone (iPTH) level is an early marker of post-thyroidectomy hypocalcemia. However, lack of methodological standardization to define timing and cut-off points of iPTH measurement limit its clinical applicability. Here, we evaluated the relationship between two distinct postoperative time sampling and iPTH accuracy on predicting hypocalcemia. METHODS: iPTH was measured within 4 h after surgery (iPTH 4 h) and on the morning of the first postoperative day (iPTH 1st PO)...
May 2, 2018: Endocrine
https://www.readbyqxmd.com/read/29707916/association-between-parathyroid-hormone-and-cardiovascular-disease
#9
REVIEW
Hideki Fujii
Although parathyroid hormone is known to be related with calcium and phosphate metabolism, it has been also reported to have several effects on the cardiovascular system including heart and vessels. However, the detailed pathophysiological mechanisms remain unclear. Clinical studies have indicated that parathyroid hormone is associated with cardiovascular events and mortality not only in patients with chronic kidney disease but also in those without chronic kidney disease. As a possible mechanism, it is thought that parathyroid hormone is associated with the renin-angiotensin-aldosterone system and has direct effects on the cardiovascular system...
April 30, 2018: Therapeutic Apheresis and Dialysis
https://www.readbyqxmd.com/read/29691795/improved-protocol-for-chondrogenic-differentiation-of-bone-marrow-derived-mesenchymal-stem-cells-effect-of-pthrp-and-fgf-2-on-tgf%C3%AE-1-bmp2-induced-chondrocytes-hypertrophy
#10
Davood Nasrabadi, Siamak Rezaeiani, Mohamadreza Baghaban Eslaminejad, Aliakbar Shabani
Growth factors have a pivotal role in chondrogenic differentiation of stem cells. The differential effects of known growth factors involved in the maintenance and homeostasis of cartilage tissue have been previously studied in vitro. However, there are few reported researches about the interactional effects of growth factors on chondrogenic differentiation of stem cells. The aim of this study is to examine the combined effects of four key growth factors on chondrogenic differentiation of mesenchymal stem cells (MSCs)...
April 24, 2018: Stem Cell Reviews
https://www.readbyqxmd.com/read/29689559/molecular-regulation-of-bone-metastasis-pathogenesis
#11
Meng-Yu Wu, Chia-Jung Li, Giou-Teng Yiang, Yeung-Leung Cheng, Andy Po-Yi Tsai, Yueh-Tseng Hou, Yu-Chieh Ho, Ming-Feng Hou, Pei-Yi Chu
Distant metastases are the major cause of mortality in cancer patients. Bone metastases may cause bone fractures, local pain, hypercalcemia, bone marrow aplasia, and spinal cord compression. Therefore, the management of bone metastases is important in cancer treatment. Normal bone remodeling is regulated by osteoprotegerin ligand (OPGL), receptor activator of NF-κB ligand (RANKL), parathyroid hormone-related protein (PTHrP), and other cytokines. In the tumor microenvironment, tumor cells induce a vicious cycle that promotes osteoblastic and osteolytic lesions...
April 18, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29673407/hypercalcemia-as-a-rare-presentation-of-angioimmunoblastic-t-cell-lymphoma-a-case-report
#12
Sana Chams, Inaya Hajj Hussein, Skye El Sayegh, Nour Chams, Khalid Zakaria
BACKGROUND: Angioimmunoblastic T cell lymphoma is a rare malignancy, accounting for only 2% of all non-Hodgkin lymphomas, first described in the 1970s and subsequently accepted as a distinct entity in the current World Health Organization classification. Due to the paucity of this disease, there is still no identifiable etiology, no consistent risk factors, and the pathogenesis remains unclear. CASE PRESENTATION: An 83-year-old Caucasian man presented to an emergency department with palpitations and was found to have atrial fibrillation...
April 20, 2018: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/29670736/expression-of-parathyroid-hormone-related-protein-pthrp-in-ameloblastomas
#13
Rafael Zeballos, Ronell Bologna-Molina, Vanesa Pereira-Prado, Mariana Villarroel-Dorrego
Background: Presence of parathyroid hormone related protein (PTHrP) might suggest that ameloblastomas recapitulate features of the enamel epithelium and induce bone resorption, which would facilitate their growth and local invasion. The aim of this study was to determine the expression of PTHrP in ameloblastomas. Material and Methods: An observational research study was designed including 39 cases of histologically diagnosed ameloblastomas (39 out of 42 patients gave consent for the use of their medical records and all data required for this study)...
February 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29667006/establishment-and-characterization-of-a-c57bl-6-mouse-model-of-bone-metastasis-of-breast-cancer
#14
Toru Hiraga, Tadashi Ninomiya
Bone is one of the most common sites of metastasis in patients with advanced breast cancer; however, the mechanisms of bone metastasis remain to be fully elucidated. Animal models are essential research tools for investigating the mechanisms of diseases and drug actions. To date, there have only been a few reports in which C57BL/6 mice were used for the study of bone metastases of breast cancer. In the current study, we found that intracardiac inoculation of C57BL/6 mouse-derived parental E0771 breast cancer cells (E0771/Pa) frequently lead to bone metastases in C57BL/6 mice within 2 weeks...
April 17, 2018: Journal of Bone and Mineral Metabolism
https://www.readbyqxmd.com/read/29662200/targeting-sphingosine-1-phosphate-lyase-as-an-anabolic-therapy-for-bone-loss
#15
Sarah Weske, Mithila Vaidya, Alina Reese, Karin von Wnuck Lipinski, Petra Keul, Julia K Bayer, Jens W Fischer, Ulrich Flögel, Jens Nelsen, Matthias Epple, Marta Scatena, Edzard Schwedhelm, Marcus Dörr, Henry Völzke, Eileen Moritz, Anke Hannemann, Bernhard H Rauch, Markus H Gräler, Gerd Heusch, Bodo Levkau
Sphingosine-1-phosphate (S1P) signaling influences bone metabolism, but its therapeutic potential in bone disorders has remained unexplored. We show that raising S1P levels in adult mice through conditionally deleting or pharmacologically inhibiting S1P lyase, the sole enzyme responsible for irreversibly degrading S1P, markedly increased bone formation, mass and strength and substantially decreased white adipose tissue. S1P signaling through S1P2 potently stimulated osteoblastogenesis at the expense of adipogenesis by inversely regulating osterix and PPAR-γ, and it simultaneously inhibited osteoclastogenesis by inducing osteoprotegerin through newly discovered p38-GSK3β-β-catenin and WNT5A-LRP5 pathways...
April 16, 2018: Nature Medicine
https://www.readbyqxmd.com/read/29655960/systemic-redox-biomarkers-and-their-relationship-to-prognostic-risk-markers-in-autosomal-dominant-polycystic-kidney-disease-and-iga-nephropathy
#16
Ambreen Tariq, Mohammad A Mansoor, Hans-Peter Marti, Grete Jonsson, Audun Slettan, Pabasara Weeraman, Terje Apeland
BACKGROUND: Oxidative stress is evident from an early stage in chronic kidney disease (CKD). Therefore, we investigated redox biomarkers in polycystic kidney disease (ADPKD) and IgA nephropathy (IGAN). METHODS: This is a case-control study with three groups: ADPKD (n = 54), IGAN (n = 58) and healthy controls (n = 86). The major plasma aminothiols with their redox species were examined: homocysteine (Hcy), cysteinglycine (CG), cysteine (Cys) and glutathione (GSH)...
April 12, 2018: Clinical Biochemistry
https://www.readbyqxmd.com/read/29629316/management-of-functional-neuroendocrine-tumors-of-the-pancreas
#17
REVIEW
Kjell Öberg
Pancreatic neuroendocrine tumors (pNETs) constitute a heterogenous group of malignancies with varying clinical presentation, tumor biology and prognosis. The incidence of pNETs has steadily increased during the last decades with an estimated incidence 2012 of 4.8/100,000. Recent whole genome sequencing of pNETs has demonstrated mutations in the DNA repair genes MUTYH and point mutations and gene fusions in four main pathways from chromatin remodeling, DNA damage repair, activation of mechanistic target of rapamycin (mTOR) signaling and the telomere maintenance...
February 2018: Gland Surgery
https://www.readbyqxmd.com/read/29627891/anabolic-agents-what-is-beyond-osteoporosis
#18
REVIEW
Y Liu, A E Levack, E Marty, O Or, B P Samuels, M Redko, J M Lane
Osteoporosis is a common skeletal disorder characterized by low bone mass, which leads to reduced bone strength and an increased risk of fractures. Anabolic agents have been shown to improve bone mass and decrease fracture risk in osteoporosis patients by directly stimulating osteoblasts to produce new bone. Currently, two anabolic agents are available in the USA: recombinantly produced teriparatide (TPTD), which is the fully active (1-34) amino active sequence of human parathyroid hormone (PTH), and abaloparatide (APTD), a synthetic analog of parathyroid hormone-related peptide (PTHrP)...
April 7, 2018: Osteoporosis International
https://www.readbyqxmd.com/read/29626351/parathyroid-hormone-induced-down-regulation-of-mir-532-5p-for-matrix-metalloproteinase-13-expression-in-rat-osteoblasts
#19
Vishal Mohanakrishnan, Arumugam Balasubramanian, Gokulnath Mahalingam, Nicola Chennell Partridge, Ilangovan Ramachandran, Nagarajan Selvamurugan
Parathyroid hormone (PTH) acts on osteoblasts and functions as an essential regulator of calcium homeostasis and as a mediator of bone remodeling. We previously reported that PTH stimulates the expression of matrix metalloproteinase-13 (MMP-13) in rat osteoblasts and that MMP-13 plays a key role in bone remodeling, endochondral bone formation, and bone repair. Recent evidence indicated that microRNAs (miRNAs) have regulatory functions in bone metabolism. In this study, we hypothesized that the down-regulation of miRNAs that target MMP-13 by PTH leads to the stimulation of MMP-13 expression in osteoblasts...
April 6, 2018: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/29623754/bone-mineral-density-in-primary-care-patients-related-to-serum-calcium-concentrations-a-longitudinal-cohort-study-from-sweden
#20
Sofia Dalemo, Robert Eggertsen, Per Hjerpe, Erik G Almqvist, Kristina Bengtsson Boström
OBJECTIVE: Elevated calcium concentration is a commonly used measure in screening analyses for primary hyperparathyroidism (pHPT) and cancer. Low bone mineral density (BMD) and osteoporosis are common features of pHPT and strengthen the indication for parathyroidectomy. It is not known whether an elevated calcium concentration could be a marker of low BMD in suspected pHPT patients with a normal parathyroid hormone concentration. PURPOSE: To study if low BMD and osteoporosis are more common after ten years in patients with elevated compared with normal calcium concentrations at baseline...
June 2018: Scandinavian Journal of Primary Health Care
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