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1,25-dihydroxyvitamin d

Likang Lyu, Haishen Wen, Yun Li, Jifang Li, Ji Zhao, Simin Zhang, Min Song, Xiaojie Wang
In the present study, we conducted an RNA-Seq analysis to characterize the genes and pathways involved in acute thermal and cold stress responses in the liver of black rockfish, a viviparous teleost that has the ability to cope with a wide range of temperature changes. A total of 584 annotated differentially expressed genes (DEGs) were identified in all three comparisons (HT vs NT, HT vs LT and LT vs NT). Based on an enrichment analysis, DEGs with a potential role in stress accommodation were classified into several categories, including protein folding, metabolism, immune response, signal transduction, molecule transport, membrane, and cell proliferation/apoptosis...
June 14, 2018: Scientific Reports
Chang Liu, Tatiana Shaurova, Suzanne Shoemaker, Martin Petkovich, Pamela A Hershberger, Yun Wu
Mutation in the tyrosine kinase (TK) domain of the epidermal growth factor receptor (EGFR) gene drives the development of lung cancer. EGFR tyrosine kinase inhibitors (EGFR TKI) including erlotinib and afatinib are initially effective in treating EGFR mutant non-small cell lung cancer (NSCLC). However, drug resistance quickly develops due to several mechanisms, including induction of the epithelial-mesenchymal transition (EMT). No effective therapies are currently available for patients who develop EMT-associated EGFR TKI resistance...
June 14, 2018: Molecular Pharmaceutics
Nina Acharya, Dermot R Doherty, Nick Barrowman, Gyaandeo Maharajh, Tara Girolamo, Katie O'Hearn, J Dayre McNally
BACKGROUND: Consistent with accepted practice in stable ambulatory populations, the majority of ICU research has evaluated vitamin D status using a single blood 25-hydroxyvitamin D (25(OH)D) level. Only a limited number of ICU studies have measured the active hormone, 1,25-dihydroxyvitamin D (calcitriol) and none have used change in calcitriol levels to evaluate axis functioning. The objective of this study was to describe the impact of Congenital Heart Disease (CHD) surgery on calcitriol levels and evaluate the relationship between change in postoperative levels and clinical course...
June 13, 2018: Pediatric Research
Ichiro Kaneko, Hiroko Segawa, Kayo Ikuta, Ai Hanasaki, Toru Fujii, Sawako Tatsumi, Shinsuke Kido, Tomoka Hasegawa, Norio Amizuka, Hitoshi Saito, Ken-Ichi Miyamoto
X-linked hypophosphatemia (XLH), the most common form of inheritable rickets, is caused by inactivation of PHEX (phosphate-regulating gene with homologies to endopeptidases on the X chromosome), and leads to fibroblast growth factor 23 (FGF23)-dependent renal phosphate (Pi) wasting. In the present study, we investigated whether maintaining Pi homeostasis with a novel potent vitamin D3 analog, eldecalcitol (1α,25-dihydroxy-2β-(3-hydroxypropyloxy)vitamin D3; ED71), could improve hypophosphatemic rickets in a murine model of XLH, the Hyp mouse...
June 5, 2018: Endocrinology
Carsten Carlberg
The vitamin D3 metabolite 1α,25-dihydroxyvitamin D3 [1,25(OH)2 D3 ] is the exclusive high-affinity ligand of the vitamin D receptor (VDR), a transcription factor with direct effects on gene expression. Transcriptome- and epigenome-wide data obtained in THP-1 human monocytes are the basis of the chromatin model of vitamin D signaling. The model describes, how VDR's spatio-temporal binding profile provides key insight into the pleiotropic action of vitamin D. The transcription of some 300 primary target genes is significantly modulated through the action of genomic VDR binding sites in concert with the pioneer transcription factor PU...
2018: Frontiers in Endocrinology
Silvina Eduardo-Canosa, María Marco Rita Sigüeiro, Antonio Mouriño
Herein, we describe our studies on the synthesis of 1α,25-dihydroxyvitamin D3 analogs possessing a benzene ring replacing the natural 5-membered D-ring by the Wittig-Horner and dienyne approaches. A key feature is the synthesis of a Cr(CO)3-complexed previtamin D derivative that enables the construction of vitamin D analogs with aromatic D-ring through a thermal [1,7]-H sigmatropic shift. This study establishes the basis for the design of new vitamin D analogs containing aromatic D-ring, complexed or uncomplexed to Cr(CO)3 type moieties for specific molecular recognition and drug research and development...
2018: Anais da Academia Brasileira de Ciências
Meijin Zhang, Liming Lin, Changsheng Xu, Dajun Chai, Feng Peng, Jinxiu Lin
Background and aim: Upregulation of prolyl isomerase-1 (Pin1) protein expression and activity was associated with the pathogenesis of diabetic vasculopathy through induction of endothelial oxidative stress and inflammation. Moreover, VDR agonist protects against high glucose-induced endothelial apoptosis through the inhibition of oxidative stress. We aimed to explore the effects of the VDR agonist on diabetes-associated endothelial dysfunction and the role of Pin1 in this process. Methods: Streptozocin-induced diabetic mice were randomly treated with vehicle, VDR agonist (10  μ g/kg/d, i...
2018: Oxidative Medicine and Cellular Longevity
Libin Zheng, Dong Huang
Objective: To investigate the effects of FTY720-P on EphA2-EphrinA2 bidirectional signaling in osteoclasts. Methods: Murine RAW264.7 macrophages were induced into osteoclasts by dexamethasone and 1α, 25-dihydroxyvitamin D 3 , and identified by tartrate resistant acid phosphatase (TRAP) staining. Then, the osteoclasts were divided into 2 groups. The osteoclasts were treated with 400 ng/mL FTY720-P in experimental group and without FTY720-P in control group, respectively...
May 1, 2018: Chinese Journal of Reparative and Reconstructive Surgery
Cora M Best, Eva K Pressman, Ruth Anne Queenan, Elizabeth Cooper, Françoise Vermeylen, Kimberly O O'Brien
Background: Interpretation of serum vitamin D biomarkers across pregnancy is complex due to limited understanding of pregnancy adaptations in vitamin D metabolism. During pregnancy, both gestational age and serum 25-hydroxyvitamin D [25(OH)D] concentrations may influence the concentrations of 1,25-dihydroxyvitamin D [1,25(OH)2D], 24,25-dihydroxyvitamin D [24,25(OH)2D], and parathyroid hormone (PTH). Objective: We aimed to identify predictors of change in serum 25(OH)D across gestation in pregnant adolescents and to assess the contribution made by cholecalciferol (vitamin D3) supplementation...
May 23, 2018: Journal of Nutrition
Archit Kumar, Mini P Singh, Ragini S Kumar, Radha Kanta Ratho
The antiviral and immunomodulatory role of vitamin D has been shown in various viral infections. However, there is scanty literature available about the effect of vitamin D supplementation in herpes simplex virus-1 (HSV-1) infection. Therefore, the present study aimed to evaluate the role of two different forms of vitamin D: 25-hydroxyvitamin D3 (25D3) and 1,25-dihydroxyvitamin D3 (1,25D3) against HSV-1 in HeLa cells. The HeLa cells were supplemented with either 25D3 or 1,25D3 before HSV-1 infection and were studied after 6, 12, and 24 h postinfection (p...
May 24, 2018: Viral Immunology
Larissa Kägi, Carla Bettoni, Eva M Pastor-Arroyo, Udo Schnitzbauer, Nati Hernando, Carsten A Wagner
BACKGROUND: The 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) together with parathyroid hormone (PTH) and fibroblast growth factor 23 (FGF23) regulates calcium (Ca2+) and phosphate (Pi) homeostasis, 1,25(OH)2D3 synthesis is mediated by hydroxylases of the cytochrome P450 (Cyp) family. Vitamin D is first modified in the liver by the 25-hydroxylases CYP2R1 and CYP27A1 and further activated in the kidney by the 1α-hydroxylase CYP27B1, while the renal 24-hydroxylase CYP24A1 catalyzes the first step of its inactivation...
2018: PloS One
Manfred Mielenz, Michael W Pfaffl, Christina Schlumbohm, Johein Harmeyer, Nahid Parvizi
The regulation of growth hormone (GH) release during prenatal development and during early postnatal life is not entirely clarified. In this study plasma GH concentrations in pigs with inherited pseudo vitamin D deficiency type I (PDDR-I), which regularly show growth retardation, were compared during ontogeny with unaffected pigs of the same breed (German Landrace, DL) as control. Plasma GH concentrations were measured in plasma of chronically catheterized fetuses (beginning on day 101 after mating or after artificial insemination) and in piglets (day 37 postpartum (p...
May 15, 2018: Nutrients
M R Wilkens, K Elfers, M Schmicke, G Breves, A S Muscher-Banse
In livestock, feeding a reduced nitrogen (N) diet is favored for economic and ecological reasons. Ruminants cope more easily with a reduced N diet than monogastric species. However, changes in mineral homeostasis such as a reduction in 1,25-dihydroxyvitamin D3 (1,25-(OH)2 D3 ) concentrations, calcium (Ca), and IGF1 levels were observed in goats kept on a reduced N diet. The decrease in 1,25-(OH)2 D3 occurred even during a simultaneous reduction in dietary N and Ca, whereas a solitary Ca reduction stimulated 1,25-(OH)2 D3 synthesis...
April 3, 2018: Domestic Animal Endocrinology
Dong Wang, Jian-Hong Gu, Ling-Ling Feng, Xi-Shuai Tong, Rui-Long Song, Hong-Yan Zhao, Jian-Chun Bian, Xue-Zhong Liu, Yan Yuan, Zong-Ping Liu
Avian bone metabolism diseases affect the development and production of chickens, and many of these diseases can be prevented and controlled by balanced nutrition and hormone medicine. The steroid hormone 1α,25-dihydroxyvitamin D3 plays a key role in maintaining the balance of avian bone metabolism. Clinically, 1α,25-(OH)2 D3 has been used to treat several bone diseases. Although several previous studies have investigated the effects of 1α,25-(OH)2 D3 on osteoclastogenesis, the mechanisms underpinning osteoclast (OC) activity remain largely unknown...
May 10, 2018: Biochemical and Biophysical Research Communications
Johann Lechner, Jürgen Aschoff, Tatjana Rudi
Background: Recent research on vitamin D indicates that our current understanding of the factors leading to chronic inflammation should be revised. One of the key mechanisms by which microbial immunosuppression occurs is the suppression of one of the most common endogenous cell nucleus receptors: the vitamin D receptor (VDR). Autoimmune diseases may be correlated with VDR deactivation (VDR-deac) which occurs when the receptor is no longer able to transcribe antimicrobial agents. Excess 1,25-dihydroxyvitamin D (1,25D) is not converted to 25-hydroxyvitamin D (25D); thus, high 1,25D levels may be accompanied by low 25D values...
2018: International Journal of General Medicine
Khaled Al-Tarrah, Martin Hewison, Naiem Moiemen, Janet M Lord
Vitamin D deficiency is common among the general population. It is also observed in up to 76% of critically ill patients. Despite the high prevalence of hypovitaminosis D in critical illness, vitamin D is often overlooked by medical staff as the clinical implications and consequences of vitamin D deficiency in acute contexts remain to be fully understood. Vitamin D has a broad range of pleotropic effects on various processes and systems including the immune-inflammatory response. 1α,25-dihydroxyvitamin D (1,25(OH)2 D), has been shown to promote a tolerogenic immune response limiting deleterious inflammatory effects, modulation of the innate immune system, and enhancement of anti-microbial peptides...
2018: Burns and trauma
Ai Takeshita, Kazuki Kawakami, Kenryo Furushima, Masayasu Miyajima, Kazushige Sakaguchi
Fibroblast growth factor 23 (FGF23) plays critical roles in phosphate handling and vitamin D metabolism in the kidney. However, the effector cells of FGF23 in the kidney remain unclear. αKlotho, a putative enzyme possessing β-glucuronidase activity and also a permissive co-receptor for FGF23 to bind to FGF receptors (FGFRs), is expressed most abundantly in distal convoluted tubules, whereas it is expressed modestly in proximal tubules. Key molecular players of phosphate homeostasis and vitamin D-metabolizing enzymes are known to localize in proximal tubules...
May 2, 2018: Scientific Reports
Karin Hufnagl, Erika Jensen-Jarolim
Introduction: Vitamins A and D are able to modulate innate and adaptive immune responses and may therefore influence the development and the course of allergic diseases. Materials and methods: This article reviews the current evidence for the experimental effects of vitamins A and D in vivo in animal models and on immune cells in vitro , and discusses their translational implication. A systematic literature search over the last 10 years was performed using MEDLINE and PubMed databases...
2018: Allergo Journal International
Elena Izkhakov, Orli Sharon, Esther Knoll, Asaf Aizic, Dan M Fliss, Fortune Kohen, Naftali Stern, Dalia Somjen
BACKGROUND: Sorafenib improves progression-free survival in patients with progressive radioactive iodine-refractory differentiated thyroid carcinoma, but causes severe side effects. Estrogens may accelerate thyroid carcinoma cell growth. Our group recently reported that isoflavone derivative 7-(O)-carboxymethyl daidzein conjugated to N-t-boc-hexylenediamine (cD-tboc), a novel anti-estrogenic compound, retards the growth of both thyroid carcinoma cell lines and cultured human carcinoma cells...
April 24, 2018: Journal of Steroid Biochemistry and Molecular Biology
Rachel B Reinert, Dale Bixby, Ronald J Koenig
Fibroblast growth factor 23 (FGF23)-induced hypophosphatemia is a rare paraneoplastic syndrome of phosphate wasting that, if unrecognized, may cause tumor-induced osteomalacia. It is classically associated with benign mesenchymal tumors but occasionally has been found in patients with other malignancies. Hypophosphatemia has been associated with acute leukemia but has not previously been reported to be due to inappropriate FGF23 secretion. Here, we describe FGF23-induced severe hypophosphatemia and renal phosphate wasting associated with a mixed-phenotype Philadelphia chromosome-like acute leukemia in a previously healthy 22-year-old man...
May 1, 2018: Journal of the Endocrine Society
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