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https://www.readbyqxmd.com/read/28523260/combination-therapy-of-raloxifene-and-alendronate-for-treatment-of-osteoporosis-in-elderly-women
#1
Mi Jung Um, Eun A Cho, Hyuk Jung
OBJECTIVES: To evaluate and compare the efficacy and safety of the combination of raloxifene and alendronate with those of monotherapies in elderly women with osteoporosis. METHODS: Sixty-two postmenopausal women (mean age 63.5 ± 0.5 years) attending gynecologic osteoporosis clinics with established osteoporosis were randomly allocated to one of four treatment groups and monitored for 3 years. All patients enrolled in this study, including those in the control group (n = 14), received 1...
April 2017: Journal of Menopausal Medicine
https://www.readbyqxmd.com/read/28515153/differential-regulation-of-renal-klotho-and-fgfr1-in-normal-and-uremic-rats
#2
Juan R Muñoz-Castañeda, Carmen Herencia, Maria Victoria Pendón-Ruiz de Mier, Maria Encarnación Rodriguez-Ortiz, Juan M Diaz-Tocados, Noemi Vergara, Julio M Martínez-Moreno, Maria Dolores Salmerón, William G Richards, Arnold Felsenfeld, Makoto Kuro-O, Yolanda Almadén, Mariano Rodríguez
In renal failure, hyperphosphatemia occurs despite a marked elevation in serum fibroblast growth factor (FGF)-23. Abnormal regulation of the FGFR1-Klotho receptor complex may cause a resistance to the phosphaturic action of FGF23. The purpose of the present study was to investigate the regulation of renal Klotho and FGF receptor (FEFR)-1 in healthy and uremic rats induced by 5/6 nephrectomy. In normal rats, the infusion of rat recombinant FGF23 enhanced phosphaturia and increased renal FGFR1 expression; however, Klotho expression was reduced...
May 17, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28509123/serum-calcitriol-levels-in-a-patient-with-x-linked-hypophosphatemia-complicated-by-autosomal-dominant-polycystic-kidney-disease
#3
Satomi Kajita, Takehisa Yamamoto, Naoko Tsugawa, Hirohumi Nakayama, Takuo Kubota, Toshimi Michigami, Keiichi Ozono
Serum calcitriol [1,25(OH)2D] levels are low normal in the presence of hypophosphatemia in X-linked dominant hypophosphatemic rickets (XLH) due to elevated serum fibroblast growth factor 23 (FGF23) levels. We report a peculiar finding of markedly elevated serum 1,25(OH)2D levels in a patient with XLH complicated by autosomal dominant polycystic kidney disease (ADPKD) and retinitis pigmentosa (RP). She was diagnosed with XLH, ADPKD and RP at the age of 5, 13 and 15 years, respectively. After the diagnosis of ADPKD, the 1,25(OH)2D levels increased up to 282 pg/mL treated with a pharmacological dose of 1αOHD3 (1αOHD3)...
May 2017: CEN Case Reports
https://www.readbyqxmd.com/read/28501775/vitamin-d-correlation-with-biochemical-and-body-composition-changes-in-a-southern-brazilian-population-and-induction-of-cytotoxicity-in-mesenchymal-stem-cells-derived-from-human-adipose-tissue
#4
João Renato Pesarini, Rodrigo Juliano Oliveira, Lucas Roberto Pessatto, Andréia Conceição Milan Brochado Antoniolli-Silva, Ingrid Felicidade, Nance Beyer Nardi, Melissa Camassola, Mário Sérgio Mantovani, Lúcia Regina Ribeiro
Studies have shown that metabolic disorders, serum inflammatory markers and weight gain (obesity) are correlated with vitamin D deficiency. Therefore, the present study correlated the serum calcidiol (s25(OH)D3) levels in a sample of individuals from southern Brazil with variables related to metabolic disorders, obesity and lifestyle habits and assessed the cytotoxic effect of calcitriol on adipose tissue-derived mesenchymal stem cells (ADSCs). The results showed a 79.23% prevalence of hypovitaminosis D in the study population and a correlation (p<0...
May 11, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28501403/use-of-calcitriol-to-maintain-postpartum-blood-calcium-and-improve-immune-function-in-dairy-cows
#5
A Vieira-Neto, I R P Lima, F Lopes, C Lopera, R Zimpel, L D P Sinedino, K C Jeong, K Galvão, W W Thatcher, C D Nelson, J E P Santos
Our objectives were to determine the effects of an injectable formulation of calcitriol on mineral metabolism and immune function in postpartum Holstein cows that received an acidogenic diet prepartum to minimize hypocalcemia. In experiment 1, cows within 6 h of calving received calcitriol (0, 200, or 300 μg) to determine the dose needed to increase plasma concentrations of Ca; 300 μg was sufficient to sustain Ca for at least 3 d. In experiment 2, multiparous cows were assigned randomly to receive only vehicle (control, n = 25) or 300 μg of calcitriol (n = 25) subcutaneously within the first 6 h after calving...
May 10, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28495360/fractures-and-osteomalacia-in-a-patient-treated-with-frequent-home-hemodialysis
#6
Mark R Hanudel, Larry Froch, Barbara Gales, Harald Jüppner, Isidro B Salusky
Bone deformities and fractures are common consequences of renal osteodystrophy in the dialysis population. Persistent hypophosphatemia may be observed with more frequent home hemodialysis regimens, but the specific effects on the skeleton are unknown. We present a patient with end-stage renal disease treated with frequent home hemodialysis who developed severe bone pain and multiple fractures, including a hip fracture and a tibia-fibula fracture complicated by nonunion, rendering her nonambulatory and wheelchair bound for more than a year...
May 9, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28492801/orthotopic-tumorgrafts-in-nude-mice-as-a-model-to-evaluate-calcitriol-effects-in-breast-cancer
#7
V C N Fonseca-Filho, M L H Katayama, E C Lyra, D A Maria, R A Basso, S Nonogaki, J M Guerra, S Maistro, J C G S Góes, M A A K Folgueira
Objectives: To establish a tumorgraft model, from freshly collected breast cancer samples, which were directly implanted in nude mice, to study calcitriol effects. Methods: Breast cancer samples collected from 12 patients were orthotopically implanted into nude mice. Animals were treated with weekly intratumoral injections of calcitriol 3 μg/Kg, which was previously shown to induce peak serum calcitriol levels in the predicted therapeutic range. Results: Success engraftment rate was 25%...
May 4, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28492361/influence-of-rs2228570-on-transcriptional-activation-by-the-vitamin-d-receptor-in-human-gingival-fibroblasts-and-periodontal-ligament-cells
#8
Kaining Liu, Bing Han, Huanxin Meng, Jianxia Hou
BACKGROUND: Rs2228570 is the only known single nucleotide polymorphism of the vitamin D receptor (VDR) that alters the protein structure. VDRs can be distinguished using the restriction endonuclease FokI, and accordingly divided into three genotypes: FF, Ff and ff. The influence of rs2228570 on transcriptional activation by VDR in human gingival fibroblasts (hGFs) and periodontal ligament cells (hPDLCs) was investigated in this study. METHODS: hGFs and hPDLCs from 15 donors were cultured, genomic DNA was extracted, and genotypes were determined using the PCR-RFLP method...
May 11, 2017: Journal of Periodontology
https://www.readbyqxmd.com/read/28481952/identification-of-potential-new-treatment-response-markers-and-therapeutic-targets-using-a-gaussian-process-based-method-in-lapatinib-insensitive-breast-cancer-models
#9
Tapesh Santra, Sandra Roche, Neil Conlon, Norma O'Donovan, John Crown, Robert O'Connor, Walter Kolch
Molecularly targeted therapeutics hold promise of revolutionizing treatments of advanced malignancies. However, a large number of patients do not respond to these treatments. Here, we take a systems biology approach to understand the molecular mechanisms that prevent breast cancer (BC) cells from responding to lapatinib, a dual kinase inhibitor that targets human epidermal growth factor receptor 2 (HER2) and epidermal growth factor receptor (EGFR). To this end, we analysed temporal gene expression profiles of four BC cell lines, two of which respond and the remaining two do not respond to lapatinib...
2017: PloS One
https://www.readbyqxmd.com/read/28478843/respiratory-alkalosis-may-impair-the-production-of-vitamin-d-and-lead-to-significant-morbidity-including-the-fibromyalgia-syndrome
#10
John M Lewis, Toinette H Fontrier, J Lynn Coley
Hyperventilation caused by physical and/or psychological stress may lead to significant respiratory alkalosis and an elevated systemic pH. The alkalotic pH may in turn suppress the normal renal release of phosphate into the urine, thereby interrupting the endogenous production of 1,25-dihydroxyvitamin D (calcitriol). This could cause a shortfall in its normal production, leading to a variety of adverse consequences. It might partially explain the pathogenesis of acute mountain sickness, a treatable disease characterized by severe hyperventilation secondary to the hypoxia of high altitude exposure...
May 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28471122/could-25-oh-vitamin-d-deficiency-be-a-reason-for-hpv-infection-persistence-in-cervical-premalignant-lesions
#11
Emre Özgü, Nafiye Yılmaz, Eralp Başer, Tayfun Güngör, Salim Erkaya, Halil İbrahim Yakut
Vitamin D is an essential precursor to the steroid hormone calcitriol which mainly regulates calcium homeostasis. Moreover anti- proliferative, pro- apoptotic, anti- angiogenic effects of Vitamin D support the ideas of preventive role in various cancer. This study aimed to determine if there is a relationship between HPVDNA infection and cervical intraepithelial neoplasia and Vitamin D deficiency. As a result of the study the difference of 25-OH Vitamin D3 levels between HPVDNA positive group and the control group were statistically significant (p=0,009)...
July 2016: Journal of Experimental Therapeutics & Oncology
https://www.readbyqxmd.com/read/28460073/regulation-of-mir-29b-and-mir-30c-by-vitamin-d-receptor-activators-contributes-to-attenuate-uraemia-induced-cardiac-fibrosis
#12
Sara Panizo, Natalia Carrillo-López, Manuel Naves-Díaz, Guillermo Solache-Berrocal, Laura Martínez-Arias, Raúl R Rodrigues-Díez, Amalia Fernández-Vázquez, Carlos Martínez-Salgado, Marta Ruiz-Ortega, Adriana Dusso, Jorge B Cannata-Andía, Isabel Rodríguez
Background.: Uraemic cardiomyopathy, a process mainly associated with increased myocardial fibrosis, is the leading cause of death in chronic kidney disease patients and can be prevented by vitamin D receptor activators (VDRAs). Since some microRNAs (miRNAs) have emerged as regulators of the fibrotic process, we aimed to analyse the role of specific miRNAs in VDRA prevention of myocardial fibrosis as well as their potential use as biomarkers. Methods.: Wistar rats were nephrectomized and treated intraperitoneally with equivalent doses of two VDRAs: calcitriol and paricalcitol...
April 28, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28457946/the-zebrafish-operculum-a-powerful-system-to-assess-osteogenic-bioactivities-of-molecules-with-pharmacological-and-toxicological-relevance
#13
Marco Tarasco, Vincent Laizé, João Cardeira, M Leonor Cancela, Paulo J Gavaia
Bone disorders affect millions of people worldwide and available therapeutics have a limited efficacy, often presenting undesirable side effects. As such, there is a need for novel molecules with bone anabolic properties. The aim of this work was to establish a rapid, reliable and reproducible method to screen for molecules with osteogenic activities, using the zebrafish operculum to assess bone formation. Exposure parameters were optimized through morphological analysis of the developing operculum of larvae exposed to calcitriol, a molecule with known pro-osteogenic properties...
April 27, 2017: Comparative Biochemistry and Physiology. Toxicology & Pharmacology: CBP
https://www.readbyqxmd.com/read/28456639/-hypercalcemia-and-inactive-mutation-of-cyp24a1-case-study-and-literature-review
#14
Alexandre Seidowsky, Cédric Villain, Eve Vilaine, Roselyne Baudoin, Antoine Tabarin, Marie-Laure Kottler, Étienne Cavalier, Jean-Claude Souberbielle, Ziad A Massy
We present the case of a family whose members have high levels of serum calcium (hypercalcaemia) by loss of function of the enzyme vitamin D 24-hydroxylase due to bi-allelic mutations in the CYP24A1 gene: c.443 T>C (p.Leu148Pro) and c.1187 G>A (p.Arg396Gln). 24-VITD hydroxylase is a key player in regulating the circulating calcitriol, its tissue concentration and its biological effects. Transmission is recessive. The estimated prevalence of stones in the affected subjects is estimated between 10 and 15%...
May 2017: Néphrologie & Thérapeutique
https://www.readbyqxmd.com/read/28451892/oral-paricalcitol-expanding-therapeutic-options-for-pediatric-chronic-kidney-disease-patients
#15
EDITORIAL
Michael Freundlich, Carolyn L Abitbol
The complex pathophysiology of progressive chronic kidney disease (CKD) and the development of mineral and bone disorder, abbreviated as CKD-MBD, is of vital importance to a pediatric patient. Paricalcitol, the 19 nor-1,25(OH)2D2 analogue was shown to be effective and safe in the treatment of secondary hyperparathyroidism (SHPT) in adults almost two decades ago. It also significantly improved survival in dialysis patients compared to the standard calcitriol. The successful treatment of CKD-MBD in children is essential if they are to grow and survive into adulthood...
April 27, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28444664/endocrine-complications-of-surgical-treatment-of-thyroid-cancer-an-update
#16
Pedro Iglesias, Juan José Díez
Postoperative hypoparathyroidism (HypoPT) and hypothyroidism (HypoT) are the main endocrine complications after the surgical treatment for thyroid cancer. Postsurgical HypoPT can be transient, protracted or permanent. Its frequency varies according to the underlying cervical pathology, surgical technique, and mainly the experience of the surgeon. Risk factors for HypoPT include aggressiveness of the tumor, extent of surgery, the presence of parathyroid gland in the pathologic specimen, and surgeon experience...
April 25, 2017: Experimental and Clinical Endocrinology & Diabetes
https://www.readbyqxmd.com/read/28442641/regulation-of-uridine-diphosphate-glucuronosyltransferase-2b15-expression-during-ovulation-in-the-rat
#17
Phuong T M Dam, You-Jee Jang, Jae-Il Park, Bum-Chae Choi, Sang-Jin Song, Sang-Young Chun
Uridine diphosphate-glucuronosyltransferase 2B15 (UGT2B15) conjugates 5α-androstane-3α, 17β-diol (3α-diol) to 3α-diol glucuronide (3α-diol G) in steroid target tissues. The present study investigated the regulation of UGT2B15 expression during the ovulatory process in the rat. Real-time PCR analysis revealed that treatment of immature rats with equine chorionic gonadotropin followed by human chorionic gonadotropin transiently stimulated UGT2B15 gene expression in granulosa cells of preovulatory follicles within 6 h...
April 22, 2017: Endocrine Journal
https://www.readbyqxmd.com/read/28442557/high-phosphate-induces-a-pro-inflammatory-response-by-vascular-smooth-muscle-cells-modulation-by-vitamin-d-derivatives
#18
Julio M Martínez-Moreno, Carmen Herencia, Addy Montes de Oca, Juan M Díaz-Tocados, Noemi Vergara, Mª José Gomez, Silvia D López-Argüello, Antonio Camargo, Esther Peralbo-Santaella, Maria E Rodríguez-Ortiz, Antonio Canalejo, Mariano Rodriguez, Juan R Muñoz-Castañeda, Yolanda Almaden
In chronic kidney disease patients, high phosphate (HP) levels are associated to cardiovascular disease, the major cause of morbidity and mortality. Since serum phosphate has been independently correlated with inflammation, the present study aimed to investigate an independent direct effect of HP as a pro-inflammatory factor in VSMCs. A possible modulatory effect of vitamin D was also investigated. The study was performed in an in vitro model of human aortic smooth muscle cells (HASMCs). Incubation of cells in a HP (3...
April 25, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/28429550/parathyroid-hormone-targets-in-chronic-kidney-disease-and-managing-severe-hyperparathyroidism
#19
Carmel M Hawley, Stephen G Holt
Appropriate targets for parathyroid hormone (PTH) in patients with chronic kidney disease (CKD) stages 3-5D are controversial, as are the means by which these targets might be achieved. Secondary hyperparathyroidism is linked to symptoms like bone pain and itch, in addition to less clinically overt issues like bone fragility as well as vascular and soft tissue calcification which may lead to adverse hard endpoints, particularly fracture and death. Recognized therapies for managing a rising PTH include vitamin D analogues, with or without calcimimetic (where available), in addition to management of serum mineral concentrations with diet, binders and dialysis...
March 2017: Nephrology
https://www.readbyqxmd.com/read/28429545/do-the-benefits-of-using-calcitriol-and-other-vitamin-d-receptor-activators-in-patients-with-chronic-kidney-disease-outweigh-the-harms
#20
Nigel D Toussaint, Matthew J Damasiewicz
The primary indication for administration of calcitriol or other vitamin D receptor activators (VDRA) in chronic kidney disease (CKD) is secondary hyperparathyroidism (SHPT). Prevention and treatment of SHPT appears important, as imbalances in mineral metabolism are associated with renal osteodystrophy, and higher parathyroid hormone (PTH) levels are associated with increased rates of mortality and morbidity in CKD patients. There is, however, a lack of controlled trial data that show lowering PTH with calcitriol/VDRA equates to improved clinical outcomes...
March 2017: Nephrology
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