Glucocorticoid-induced Atrophy in Bone and Muscle

糖皮质激素引起的骨和肌肉萎缩

• 批准号: 10225876
• 负责人: Teresita M. Bellido
• 金额: $ 22.59万
• 依托单位: UNIV OF ARKANSAS FOR MED SCIS
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-01 至 2023-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10225876
• 关键词: Antibodies; Apoptosis; Atrophic; Bone necrosis; Bone remodeling; Bortezomib; Cells; Cholecalciferol; Deterioration; Development; Exhibits; FBXO32 gene; FOXO1A gene; Fall prevention; Fracture; Genetic; Glucocorticoids; Goals; Homeostasis; Hormonal; In Vitro; Incidence; Intervention; Investigation; Jaw; Ligands; Mechanics; Mediating; Mitochondria; Modeling; Mus; Muscle; Muscle Cells; Muscle Contraction; Muscle Fibers; Muscle Weakness; Muscle function; Muscular Atrophy; Musculoskeletal; Musculoskeletal System; Organ Culture Techniques; Osteoblasts; Osteocytes; Osteogenesis; Patients; Pharmacology; Phase; Prevention; Proteasome Inhibition; Receptor Signaling; Regulation; Role; Ryanodine Receptor Calcium Release Channel; Signal Transduction; Skeletal Muscle; TNFSF11 gene; Testing; Therapeutic; Tissues; Up-Regulation; Vitamin D3 Receptor; Work; base; bisphosphonate; bone; bone loss; bone preservation; bone turnover; falls; fracture risk; in vivo; inhibitor/antagonist; mineralization; muscle form; muscle strength; notch protein; novel; novel therapeutic intervention; preservation; prevent; proteostasis; receptor; restoration; standard of care; transcription factor; ubiquitin-protein ligase

Excess of glucocorticoids (GC) has devastating effects on the musculoskeletal system with 30-50% of long-term treated patients exhibiting bone fractures. GC induce bone loss by increasing resorption and decreasing for- mation; and also induce muscle loss and weakness leading to higher incidence of falls. The combined effects on bone and muscle largely account for the increased fracture risk with GC. Inhibition of resorption (the current standard of care) stops bone loss; but, markedly reduces bone turnover resulting in microdamage accumulation with potential development of osteonecrosis of the jaw and atypical fractures; and does not prevent muscle weakness. Therefore, osteoanabolic therapeutic approaches that build new bone and simultaneously interfere with GC actions in muscle are sorely needed. Work leading to this application demonstrates that GC increase the expression of the proteasomal degradation inducers E3 ubiquitin ligases atrogin1, MuRF1, and MUSA1 (atrogenes) in both muscle and bone, a novel finding as atrogenes are traditionally considered muscle-specific. In addition, inhibition of proteasomal degradation with bortezomib prevents GC-induced osteoblast apoptosis and, further, bortezomib or silencing of MuRF1 in osteoblasts prevents GC-induced decrease in matrix mineral- ization in vitro. Moreover, activation of the Vitamin D receptor (VDR) has beneficial musculoskeletal effects and might prevent falls. We found that VDR signaling prevents GC-induced: 1) atrogene expression in bone and muscle ex vivo, 2) the increase in Sost expression ex vivo, and 3) apoptosis of osteoblasts and osteocytes in vitro. Based on these lines of evidence, we hypothesize that atrogene upregulation is a common mechanism underlying GC actions in bone and muscle and that interventions that interfere with atrogene expression or function will prevent GC harmful actions in both tissues. We will test this hypothesis using in vivo, ex vivo, and in vitro approaches. Aim1 will examine whether genetic loss of expression or function of MuRF1 or pharmaco- logic inhibition of the proteasome with bortezomib interfere with atrogene expression/function and counteracts GC-induced bone or muscle atrophy in vivo, in prevention and restoration models; and whether genetic deletion of Notch or FoxO1, or pharmacologic inhibition of Notch signaling prevents muscle atrophy induced by GC. Aim2 will investigate the mechanism of action of VDR signaling on GC-induced bone and muscle atrophy, by examin- ing whether VDR signaling (induced with 1,25-D3 or eldecalcitol/ED-17, a VDR ligand with reduced hypercalce- mic action) counteracts GC regulation of proteostasis, mitochondrial dynamics and cellular energetics in bone and muscle; by studying whether VDR signaling reverses the inhibition of anabolic signaling and the stimulation of catabolic signaling mediated by Sost upregulation induced by GC in bone, in mice with genetic deletion of the VDR in muscle (HSA-MerCreMer) and respective control littermates; and by determining whether VDR signaling prevents GC effects on muscle fiber type composition (glycolytic versus oxidative), and/or preserves Ryn recep- tor-mediated muscle contraction.

过量的糖皮质激素（GC）对肌肉骨骼系统有破坏性的影响，其长期影响为30-50%