Результаты поиска

Hypercalcemia of Malignancy.

Case studyA 60-year-old man initially presented with pain in the right upper quadrant in October 2010. A computed tomography (CT) scan of the abdomen pelvis completed at that time showed a mass at the junction of the body and tail of the pancreas and multiple large liver lesions. A CT-guided liver biopsy revealed low-grade neuroendocrine carcinoma. The patient was initially started on systemic treatment with sunitinib (Sutent) and octreotide. He developed intolerable side effects, including nausea and migraine. Therapy was discontinued in October 2011, when a CT scan revealed evidence of disea

Совпадение в полном тексте источника
… In the setting of lymphoma, malignant lymphocytes produce ectopic calcitriol (1,25-dihydroxyvitamin D), which leads to increased intestinal absorption of calcium. … Normally, calcidiol (25-hydroxyvitamin D) is converted to calcitriol (1,25-dihydroxyvitamin D; i.e., active vitamin D) in the kidneys under the stimulation of PTH. Calcitriol increases intestinal absorption of calcium. …

Review of Hematology-Oncology Emergencies for Internal Medicine Residents.

The prevalence of cancer continues to grow globally every year. With therapeutic advances over the recent decades, the prevalence of individuals living with cancer continues to increase. Internal medicine residents can see patients admitted to the hospital for cancer-related emergencies. Early identification and appropriate management of these emergencies have been shown to improve mortality and morbidity. In this article, we aim to review the recent updates in the management of commonly encountered oncologic emergencies in the practice of internal medicine residents. This review will cover sp

Совпадение в полном тексте источника
… Initial workup includes ionized calcium, albumin, PTH, PTHrP, 25-hydroxyvitamin D, and calcitriol levels. In humoral hypercalcemia of malignancy, PTHrP is elevated, with low to low-normal PTH, phosphorus, and calcitriol. Metastatic causes result in low PTH and calcitriol, with undetectable PTHrP. … Glucocorticoids are reserved for calcitriol-mediated hypercalcemia because they inhibit 1-alpha hydroxylase-mediated calcitriol production. …

Hypocalcaemia in patients with prostate cancer treated with a bisphosphonate or denosumab: prevention supports treatment completion.

BackgroundMost patients with advanced prostate cancer develop bone metastases, which often result in painful and debilitating skeletal-related events. Inhibitors of bone resorption, such as bisphosphonates and denosumab, can each reduce the incidence of skeletal-related events and delay the progression of bone pain. However, these agents are associated with an increased risk of hypocalcaemia, which, although often mild and transient, can be serious and life-threatening. Here we provide practical advice on managing the risk of hypocalcaemia in patients with advanced prostate cancer who are rece

Совпадение в полном тексте источника
… Vitamin D can be given as ergocalciferol or cholecalciferol, or as the active metabolites alfacalcidol or calcitriol [ 55 ]. … Treatment with calcitriol or alfacalcidol can lead to rapid changes in serum calcium levels, so patients should be monitored closely in order to avoid hypercalcaemia [ 58 ]. …

Genotype-independent association between vitamin D deficiency and polycystic ovarian syndrome in Lahore, Pakistan.

Both vitamin D deficiency and single nucleotide polymorphisms (SNPs) in the gene encoding the vitamin D receptor (VDR) have been widely reported to associate with susceptibility to polycystic ovarian syndrome (PCOS). A case-control study was conducted to study the influence of vitamin D status and genotpye for 24 SNPs in four genes in the vitamin D pathway (VDR, DBP, CYP27B1, CYP24A1) on PCOS. Statistical analyses were conducted to identify phenotypic and genotypic factors associated with risk of PCOS and to test for interactions between genotype and vitamin D status. PCOS was independently as

Vitamin D-RAAS Connection: An Integrative Standpoint into Cardiovascular and Neuroinflammatory Disorders.

BACKGROUND: The neuroinflammatory process is associated with the pathogenesis of many cardiovascular disorders, particularly with hypertension. In this regard, the deficiency of vitamin D seems to increase the risk of cardiovascular pathologies related to neuroinflammation. Long-term lack of vitamin D leads to over-activation of the renin-angiotensin-aldosterone system (RAAS), one of the essential mechanisms of blood pressure regulation. PURPOSE OF REVIEW: This review summarizes the latest studies carried out to evaluate the primary mechanisms underlying the neuroprotective effect of vitamin

Daily variability in serum levels of calciprotein particles and their association with mineral metabolism parameters: A cross-sectional pilot study.

AIM: Calciprotein particles (CPPs), colloidal protein-mineral nanoparticles composed of solid-phase calcium phosphate and serum protein fetuin-A found in blood, are emerging as a novel component of chronic kidney disease-mineral and bone disorder (CKD-MBD). The relationship of CPPs with factors known to underlie the CKD-MBD pathophysiology is not well known.The aim of this study is to examine daily variations in CPPs as well as their association with mineral metabolism parameters in normal individuals and early-stage CKD patients. METHODS: Twenty subjects (10 healthy adults, 10 diabetic patie

Further Developments of the Phenyl-Pyrrolyl Pentane Series of Nonsteroidal Vitamin D Receptor Modulators as Anticancer Agents.

The vitamin D3 receptor (VDR), which belongs to the nuclear-receptor superfamily, is a potential molecular target for anticancer-drug discovery. In this study, a series of nonsteroidal vitamin D mimics with phenyl-pyrrolyl pentane skeletons with therapeutic potentials in cancer treatment were synthesized. Among them, 11b and 11g were identified as the most effective agents in reducing the viability of four cancer-cell lines, particularly those of breast-cancer cells, with IC50 values in the submicromolar-concentration range. In addition, 11b and 11g possessed VDR-binding affinities and display

Trogocytosis of peptide-MHC class II complexes from dendritic cells confers antigen-presenting ability on basophils.

Th2 immunity plays important roles in both protective and allergic responses. Nevertheless, the nature of antigen-presenting cells responsible for Th2 cell differentiation remains ill-defined compared with the nature of the cells responsible for Th1 and Th17 cell differentiation. Basophils have attracted attention as a producer of Th2-inducing cytokine IL-4, whereas their MHC class II (MHC-II) expression and function as antigen-presenting cells are matters of considerable controversy. Here we revisited the MHC-II expression on basophils and explored its functional relevance in Th2 cell differe

Diverse osteoclastogenesis of bone marrow from mandible versus long bone.

BACKGROUND: Mandibles (MB) and maxillae possess unique metabolic and functional properties and demonstrate discrete responses to homeostatic, mechanical, hormonal, and developmental stimuli. Osteogenic potential of bone marrow stromal cells (BMSCs) differs between MB versus long bones (LB). Furthermore, MB- versus LB-derived osteoclasts (OCs) have disparate functional properties. This study explores the osteoclastogenic potential of rat MB versus LB marrow in vitro and in vivo under basal and stimulated conditions. METHODS: Bone marrow from rat MB and LB was cultured in osteoblastic or osteoc

Establishment of a stable human cell line, HPL-A3, for use in reporter gene assays of cytochrome P450 3A inducers.

We have established a stable human cell line, termed HPL-A3, by co-transfection of a human pregnane X receptor (hPXR) expression vector and a reporter plasmid (p3A4-hPXRE-Luc) containing a luciferase gene and a promoter/enhancer region of the human cytochrome P450 3A4 (CYP3A4) gene into a human hepatoma-derived cell line, HepG2. We then examined the usefulness of HPL-A3 for a chemically activated luciferase expression (CALUX) assay of human CYP3A inducers. The induction of CALUX in HPL-A3 by hPXR activators, including rifampicin, occurred in time- and concentration-dependent fashions, whereas

Vitamin D receptor and vitamin D metabolizing enzymes are expressed in the human male reproductive tract.

BACKGROUND: The vitamin D receptor (VDR) is expressed in human testis, and vitamin D (VD) has been suggested to affect survival and function of mature spermatozoa. Indeed, VDR knockout mice and VD deficient rats show decreased sperm counts and low fertility. However, the cellular response to VD is complex, since it is not solely dependent on VDR expression, but also on cellular uptake of circulating VD and presence and activity of VD metabolizing enzymes. Expression of VD metabolizing enzymes has not previously been investigated in human testis and male reproductive tract. Therefore, we perfor

Vitamin D deficiency promotes growth of MCF-7 human breast cancer in a rodent model of osteosclerotic bone metastasis.

INTRODUCTION: Breast cancer metastases to bone are common in advanced stage disease. We have recently demonstrated that vitamin D deficiency enhances breast cancer growth in an osteolytic mouse model of breast cancer metastasis. In this study, we examined the effects of vitamin D deficiency on tumor growth in an osteosclerotic model of intra-skeletal breast cancer in mice. METHODS: The effects of 1,25-dihydroxyvitamin D(3) [1,25(OH)(2)D(3)] on proliferation and apoptosis of MCF-7 breast cancer cells, and changes in the expression of genes within the vitamin D metabolic pathway (VDR, 1α- and 2

Calcium-sensing receptor gene transcription is up-regulated by the proinflammatory cytokine, interleukin-1beta. Role of the NF-kappaB PATHWAY and kappaB elements.

The calcium-sensing receptor (CASR) in parathyroid, thyroid, and kidney is essential for calcium homeostasis. Hypocalcemia is common in critically ill patients having increased circulating proinflammatory cytokines, although the causes are unknown. We hypothesized that the cytokines increase CASR expression and reduce the set point for parathyroid hormone suppression by extracellular calcium, leading to hypocalcemia and hypoparathyroidism. Here, we show in vivo in the rat that parathyroid, thyroid, and kidney CASR mRNA and protein increased after injection of interleukin-1beta. This was associ

Efficacy of treatment with calcipotriol/betamethasone dipropionate followed by calcipotriol alone compared with tacalcitol for the treatment of psoriasis vulgaris: a randomised, double-blind trial.

BACKGROUND: A two-compound product containing calcipotriol 50 microg/g and betamethasone dipropionate 0.5 mg/g (Daivobet, Dovobet) has been demonstrated to be an effective, once daily, treatment for psoriasis vulgaris. OBJECTIVE: To compare the efficacy and safety of treatment with the two-compound product for 4 weeks followed by calcipotriol for 4 weeks, with that of tacalcitol for 8 weeks in patients with stable psoriasis vulgaris. METHODS: 501 patients were randomised to double-blind treatment with the two-compound product followed by calcipotriol 50 microg/g once daily, or to tacalcitol

Bone mineral metabolism in adults with beta-thalassaemia major and intermedia.

Bone disease is an important cause of morbidity in older patients with beta-thalassaemia major and intermedia. We studied 27 women and 23 men with beta-thalassaemia major (37) and intermedia (13) whose mean age was 32.3 +/- 9.7 years. Bone mineral density (BMD) of the lumbar spine, femoral neck and distal radius was determined by dual-energy X-ray absorbiometry (DXA). The longitudinal change in BMD over a mean of 5.6 years was determined in 19 patients. Serum 25-hydroxyvitamin D, insulin growth factor-1 (IGF-1), bone formation markers bone-alkaline phosphatase, osteocalcin and the resorption m

[Nerve growth factor and diabetic neuropathy].

INTRODUCTION: The progress made by contemporary neurobiology opens new horizons both for study and for treatment of disorders of the nervous system. At the present time we are in the age of growth factors. These are molecules which affect survival, development and the normal functioning of cell populations. DEVELOPMENT: One of the most widely studied growth factors is nervous growth factor (NGF) which is necessary for normal life of various types of neurones, including sensory nerves and nerves derived from the neural crests. Diabetic neuropathy, worldwide a major neurological disorder, is pr

Витамин D как модулятор иммуно-эндокрина: открытие его роли в аутоиммунных расстройствах и механизмах защиты заложников.

Фон/цели: Витамин D, получивший всеобщее признание за свою роль в гомеостазе кальция-фосфата и здоровье скелета, стал одним из ключевых модуляторов иммуноэндокринной системы. Его активный метаболит взаимодействует с рецептором витамина D (VDR) через иммунную и эндокринную клетку, оказывая влияние на транскрипцию генов, баланс цитокина и иммунную терпимость. В настоящем докладе обобщаются механистические, эпидемиологические и клинические данные о роли витамина D в иммунной модуляции различных аутоиммунных и инфекционных заболеваний. Методы: Этот описательный обзор включал структурированный и вс

Совпадение в полном тексте источника
… Calcitriol controls various functional capabilities of T-lymphocytes, B-lymphocytes, and the cytokine milieu that interact to coordinate adaptive immune responses. … Mechanistically, calcitriol enhances macrophage antimicrobial activity, promotes phagolysosomal fusion, and induces antimicrobial peptides. …

In Vitro Study of Vitamin D Effects on Immune, Endothelial, and Vascular Smooth Muscle Cells in Chronic Kidney Disease.

Vitamin D has been shown to improve immunity as well as vascular function. We investigated the effect of cholecalciferol on T-cell phenotype in cultured peripheral blood mononuclear cells (PBMCs) from twenty vitamin D-deficient, non-diabetic chronic kidney disease (CKD) subjects. We also studied vitamin D effects on endothelial and vascular function markers in human aortic endothelial cells (HAECs) and in human aortic smooth muscle cells (HASMCs), respectively. We studied endothelial nitric oxide synthase (eNOS), mitogen-activated protein kinase 38 (p38 Map kinase), protein kinase B (Akt), and

Impact of gene polymorphisms involved in the vitamin D metabolic pathway on the susceptibility to and severity of autism spectrum disorder.

This study explores the association between genetic variations in the vitamin D pathway and autism spectrum disorder (ASD) susceptibility and severity in Thai children. A total of 276 participants, including 169 children with ASD and 107 healthy controls, were recruited. Genotyping of vitamin D pathway genes (CYP2R1, CYP27B1, GC, and VDR) was conducted using TaqMan-based real-time PCR, while serum vitamin D levels were measured by chemiluminescence immunoassay. ASD severity was assessed via the Childhood Autism Rating Scale, 2nd Edition. Results reveal that the VDR gene (ApaI) rs7975232 is lin

[Resilience in COVID-19 times: general considerations on the recovery of a 93-year-old patient on haemodialysis treatment].

We report the case of a 93-year-old woman on haemodialysis treatment for more than 30 months and with multiple comorbidities who recovered from a Covid-19 infection without any significant clinical problems. The patient has shown a delay in viral clearance with swab test negativization (confirmed) after 33 days; after testing positive again, she has resulted persistently negative, (confirmed after 49 days). After the first negative swab, IgG and IgM antibodies have been found; these have remained persistently positive after a month. As well as highlighting an unexpected resilience in an extrem