Abstract:
:Skeletal unloading in an animal hindlimb suspension model and microgravity experienced by astronauts or as a result of prolonged bed rest causes site-specific losses in bone mineral density of 1%-2% per month. This is accompanied by reductions in circulating levels of 1,25-(OH)(2)D(3), the active metabolite of vitamin D. 1,25-(OH)(2)D(3), the ligand for the vitamin D receptor (VDR), is important for calcium absorption and plays a role in differentiation of osteoblasts and osteoclasts. To examine the responses of cells to activators of the VDR in a simulated microgravity environment, we used slow-turning lateral vessels (STLVs) in a rotating cell culture system. We found that, similar to cells grown in microgravity, MG-63 cells grown in the STLVs produce less osteocalcin, alkaline phosphatase, and collagen Ialpha1 mRNA and are less responsive to 1,25-(OH)(2)D(3). In addition, expression of VDR was reduced. Moreover, growth in the STLV caused activation of the stress-activated protein kinase pathway (SAPK), a kinase that inhibits VDR activity. In contrast, the 1,25-(OH)(2)D(3) analog, EB1089, was able to compensate for some of the STLV-associated responses by reducing SAPK activity, elevating VDR levels, and increasing expression of osteocalcin and alkaline phosphatase. These studies suggest that, not only does simulated microgravity reduce differentiation of MG-63 cells, but the activity of the VDR, an important regulator of bone metabolism, is reduced. Use of potent, less calcemic analogs of 1,25-(OH)(2)D(3) may aid in overcoming this defect.
journal_name
Bonejournal_title
Boneauthors
Narayanan R,Smith CL,Weigel NLdoi
10.1016/s8756-3282(02)00836-0subject
Has Abstractpub_date
2002-09-01 00:00:00pages
381-8issue
3eissn
8756-3282issn
1873-2763pii
S8756328202008360journal_volume
31pub_type
杂志文章相关文献
BONE文献大全abstract:BACKGROUND:Vertebral fracture (VF) is the most common osteoporotic fracture in postmenopausal women, although most VFs are subclinical. Prevalent VFs are a significant predictor of subsequent fracture and therefore, identification of VF improves the identification of those with high fracture risk. The aim of present st...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2020.115358
更新日期:2020-07-01 00:00:00
abstract::Hypophosphatasia (HPP) is the inborn-error-of-metabolism characterized enzymatically by insufficient activity of the tissue-nonspecific isoenzyme of alkaline phosphatase (TNSALP) and caused by either mono- or bi-allelic loss-of-function mutation(s) of the gene ALPL that encodes this cell surface phosphomonoester phosp...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2019.02.025
更新日期:2019-05-01 00:00:00
abstract::SAM-P/6 is a recently developed strain of osteoporotic mice. In this study we tried to determine whether calcium, vitamin D3, parathyroid hormone (PTH), and estrogen modified the peak bone mass of young SAM-P/6 mice, and whether the effect of these medications persisted after treatment had been discontinued. Calcium s...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/8756-3282(94)90710-2
更新日期:1994-03-01 00:00:00
abstract::We examined the mode of action of bisphosphonates on osteoclastic cell recruitment using mouse marrow cultures with or without osteoblastic cells. Tartrate-resistant acid phosphatase-positive multinucleated cells [TRAP(+)MNC] formed in cultures were determined to be osteoclastic cells. In marrow cultures, TRAP(+) MNC ...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/8756-3282(95)00426-2
更新日期:1996-01-01 00:00:00
abstract::Bisphosphonates (BPs) are the first-line therapy for osteoporosis. In recent years, atypical femoral fractures (AFF) have been described in patients on BPs therapy. However, the relationship between BPs and AFF remains to be clarified. We evaluated clinical and hormonal characteristics of AFF patients, in order to det...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2013.07.010
更新日期:2013-10-01 00:00:00
abstract::Osteoporosis is a major public health problem in Western countries and is projected to have a similar impact in the Middle East. It has been suggested that peak bone mineral density (BMD), a major determinant of osteoporotic fractures later in life, may be lower in this part of the world compared with the Western worl...
journal_title:Bone
pub_type: 临床试验,杂志文章
doi:10.1016/s8756-3282(02)00845-1
更新日期:2002-10-01 00:00:00
abstract::Using immunohistology with two specific antisera raised against N-terminal parathyroid hormone-related protein (PTHrP) and in situ hybridization (riboprobe to common coding exon), evidence is provided for the expression of PTHrP by mouse, rabbit, and human osteoclasts derived from several in vitro and in vivo sources....
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/s8756-3282(97)00278-0
更新日期:1998-03-01 00:00:00
abstract::The prediction of bone strength can be improved when determining bone mineral density (BMD) in combination with measures of trabecular microarchitecture. The goal of this study was to assess parameters of trabecular bone structure and texture of the calcaneus by clinical multi-detector row computed tomography (MDCT) i...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2009.01.372
更新日期:2009-05-01 00:00:00
abstract::Liver X receptors (LXRs) are nuclear receptors that play a crucial role in the transcriptional control of lipid metabolism. Pharmacological LXR activation is an attractive concept for the treatment of atherosclerosis. Genetic LXR deficiency in mice has been shown to have an effect on bone turnover and structure and LX...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2010.08.018
更新日期:2011-02-01 00:00:00
abstract::Bone losses are common as a consequence of unloading and also in patients with chronic obstructive pulmonary disease (COPD). Although hypoxia has been implicated as an important factor to drive bone loss, its interaction with unloading remains unresolved. The objective therefore was to assess whether human bone loss c...
journal_title:Bone
pub_type: 临床试验,杂志文章
doi:10.1016/j.bone.2016.07.013
更新日期:2016-10-01 00:00:00
abstract::Proteins of the extracellular matrix often have multiple functions to facilitate complex tasks ranging from signaling to structural support. Here we have focused on the function of one of the matrix proteins expressed in bones and teeth, the matrix adhesion protein ameloblastin (AMBN). Transgenic mice with 5-fold elev...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2013.01.041
更新日期:2013-05-01 00:00:00
abstract:INTRODUCTION:Alström syndrome (ALMS) is an ultra-rare metabolic disorder caused by biallelic loss-of-function in the Alms1 gene which encodes a ubiquitously expressed centrosomal protein of the primary cilium. Although ALMS is characterised by several metabolic and hormonal dysfunctions that can lead to an increased ri...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2020.115756
更新日期:2021-02-01 00:00:00
abstract::Osteoarthritis (OA) affects both cartilage and bone tissues, and the subsequent breakdown of the two tissues appears to be interrelated. The interest in the role of subchondral bone changes with OA is growing, and one suggestion is that a simple inverse correlation exists between the cartilage loss and increased bone ...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2009.05.017
更新日期:2009-09-01 00:00:00
abstract:BACKGROUND:Roux-en-Y gastric bypass (RYGB) is a common surgical procedure for treatment of morbid obesity. RYGB induces considerable and sustained weight loss, and remission of obesity related-comorbidities. While studies have suggested negative effects of RYGB on bone health, long-term data are lacking. We aimed to ev...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2019.07.014
更新日期:2019-10-01 00:00:00
abstract::Twenty patients with mild Paget's disease of bone were given either 20 (10 patients) or 40 mg alendronate daily for 6 months. The 20-mg dose was well tolerated, but in 3 patients on 40 mg/d alendronate, the treatment was withdrawn after 3-5 months because of gastric and oesophageal disturbances. Urinary hydroxyproline...
journal_title:Bone
pub_type: 临床试验,杂志文章
doi:10.1016/8756-3282(94)90818-4
更新日期:1994-07-01 00:00:00
abstract::In this study we describe the generation and influences on in vitro and in vivo osteogenesis of photo-cured hyaluronic acid (HA) hydrogels loaded with growth and differentiation factor 5 (GDF-5). Prior to loading GDF-5, we characterized the release profiles from these hydrogels and tested their respective cell viabili...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2013.11.019
更新日期:2014-02-01 00:00:00
abstract::Osteocytes play an important role in signaling within bone. Communication of osteocytes with each other and with bone lining cells may have a function in mineral homeostasis and mechanotransduction. However, very little is known of the expression of ion channels in these cells. Using the whole-cell patch-clamp techniq...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/s8756-3282(00)00439-7
更新日期:2001-01-01 00:00:00
abstract::Ossification of the posterior longitudinal ligament of the spine (OPLL) is characterized by ectopic bone formation in the spinal ligaments. Mechanical stress, which acts on the posterior ligaments, is thought to be an important factor in the progression of OPLL. To elucidate this mechanism, we investigated the effects...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/s8756-3282(03)00204-7
更新日期:2003-10-01 00:00:00
abstract::The amount of bone turnover in the skeleton has been identified as a predictor of fracture risk independent of areal bone mineral density (aBMD) and is increasingly cited as an explanation for discrepancies between areal bone mineral density and fracture risk. A number of mechanisms have been proposed to explain how b...
journal_title:Bone
pub_type: 杂志文章,评审
doi:10.1016/j.bone.2008.02.001
更新日期:2008-06-01 00:00:00
abstract::Understanding the cellular basis of osteoblastic cell-biomaterial interaction is crucial to the analysis of the mechanism of osseointegration, a requirement of long-term orthopedic implant stability. Clinically, the amount of bone ingrowth is variable, and cellular parameters that influence ingrowth have yet to be cle...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/s8756-3282(99)00077-0
更新日期:1999-05-01 00:00:00
abstract:INTRODUCTION:Parathyroid hormone (PTH) is a key regulator of calcium metabolism. Parathyroid hormone-like hormone (PTHrP) contributes to skeletal development through regulation of chondrocyte proliferation and differentiation during early bone growth. Both PTH and PTHrP act through the same receptor (PTHR1). A second r...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2007.12.005
更新日期:2008-04-01 00:00:00
abstract::The prevalence of osteoarthritis (OA) is greater in women then men. Weight, a factor strongly associated with osteoarthritis, is significantly increased over the menopausal transition. Despite the high prevalence of osteoarthritis, a disabling disease with limited treatment options, there is a paucity of studies in wo...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2006.05.016
更新日期:2006-11-01 00:00:00
abstract::Bone tissue undergoes permanent and lifelong remodeling with a concerted action of bone-building osteoblasts and bone-resorbing osteoclasts. A precise cooperation between those two cell types is critical in the complex process of bone renewal. Galectin-3 is a member of the β-galactoside-binding lectin family playing m...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2017.08.013
更新日期:2017-12-01 00:00:00
abstract::Sclerostin, product of the SOST gene, is an important determinant of bone formation and resorption. Adolescents with anorexia nervosa (AN) have low bone density and decreased levels of bone turnover markers. However, sclerostin has not been examined in AN as a potential mediator of impaired bone metabolism. Our study ...
journal_title:Bone
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.bone.2012.06.006
更新日期:2012-09-01 00:00:00
abstract::Hypophosphatasia (HPP) is caused by loss-of-function mutation(s) within the gene TNSALP that encodes the "tissue-nonspecific" isoenzyme of alkaline phosphatase (TNSALP). In HPP, inorganic pyrophosphate, an inhibitor of mineralization and substrate for TNSALP, accumulates extracellularly often leading to rickets or ost...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2015.02.022
更新日期:2015-06-01 00:00:00
abstract::We examined the effect of nicotine on cellular proliferation, as measured by [3H]thymidine (TdR) incorporation and cell count, and on alkaline phosphatase activity in UMR 106-01 rat osteoblastic osteosarcoma cells. The cells were cultured with varying concentrations of nicotine in serum-free medium for 2 to 72 hours. ...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/8756-3282(91)90077-v
更新日期:1991-01-01 00:00:00
abstract:OBJECTIVE:To estimate the cost-effectiveness of strontium ranelate in the treatment of postmenopausal osteoporotic women aged over 75 years. MATERIALS AND METHODS:A validated Markov microsimulation model with a Belgian payer's perspective estimated the cost per quality-adjusted life-year (QALY) of a 3-year strontium r...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2009.08.052
更新日期:2010-02-01 00:00:00
abstract::This study reports the effects of a recreational team handball exercise programme (randomised controlled trial, RCT) on bone health, postural balance and body composition in inactive postmenopausal women without previous experience of the sport. Sixty-seven postmenopausal women (68.3 ± 6.2 years, stature 156.9 ± 5.8 c...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2021.115847
更新日期:2021-01-13 00:00:00
abstract::Many clinical and experimental investigations address the influence of statins on bone formation and fracture healing. Simvastatin was shown to increase the expression of Bone morphogenetic protein (BMP-2), which is one of the most potent growth factors targeting bone formation. In this study, the effect of simvastati...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2009.05.010
更新日期:2009-09-01 00:00:00
abstract::Disuse osteoporosis, which occurs commonly in prolonged bed rest and immobilization, is becoming a major problem in modern societies; however, the molecular mechanisms underlying unloading-driven bone loss have not been fully elucidated. The osteocyte network is considered to be an ideal mechanosensor and mechanotrans...
journal_title:Bone
pub_type: 杂志文章
doi:10.1016/j.bone.2011.07.012
更新日期:2012-01-01 00:00:00