Bone marrow fat and skeletal health in type 2 diabetes

2 型糖尿病患者的骨髓脂肪和骨骼健康

• 批准号: 9891879
• 负责人: Tiffany Youngun Kim
• 金额: --
• 依托单位: VETERANS AFFAIRS MED CTR SAN FRANCISCO
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-05-01 至 2025-04-30
• 项目状态: 未结题
• 来源: https://reporter.nih.gov/project-details/9891879
• 关键词: Address; Adipocytes; Affect; Antidiabetic Drugs; Behavior; Biometry; Bone Density; Bone Diseases; Bone Marrow; Caring; Cell Count; Clinical Investigator; Clinical Research; Complication; Complications of Diabetes Mellitus; Data; Death Rate; Diabetes Mellitus; Differentiated Gene; Dual-Energy X-Ray Absorptiometry; Enrollment; Epidemiology; Fatty acid glycerol esters; Flow Cytometry; Fracture; Fracture Healing; Funding; Future; Gastric Bypass; Gene Expression; Glycosylated hemoglobin A; Goals; Health; Healthcare; Hip Fractures; Impairment; Individual; Investigation; K-Series Research Career Programs; Lead; Link; Magnetic Resonance Spectroscopy; Marrow; Measures; Medical; Medical Care Costs; Mentors; Mentorship; Mesenchymal Stem Cells; Metabolic; Metabolism; Methods; Non-Insulin-Dependent Diabetes Mellitus; Organ; Osteoblasts; Osteogenesis; Osteoporosis; Outcome; Pathogenesis; Pathogenicity; Pathway interactions; Peripheral; Peripheral Blood Mononuclear Cell; Physicians; Play; Porosity; Positioning Attribute; Postoperative Complications; Postoperative Period; Prevalence; Preventive; Prospective Studies; Prospective cohort study; Radial; Radiology Specialty; Reporting; Research; Research Design; Research Personnel; Research Training; Resolution; Role; Serum; Shapes; Site; Skeleton; Therapeutic; Trabecular Bone Score; Training; Unsaturated Fats; Veterans; X-Ray Computed Tomography; adult obesity; bariatric surgery; bone; bone health; bone imaging; bone mass; bone quality; bone turnover; design; diabetic bone disease; economic cost; effective therapy; experience; falls; fracture risk; glycemic control; health administration; high risk; imaging modality; improved; insight; laboratory experience; lipid biosynthesis; lipid metabolism; mortality risk; negative affect; novel; osteoblast differentiation; preservation; progenitor; programs; skeletal; skills; spine bone structure; stem cells; tibia

Dr. Kim’s long-term goal is to be a VA physician investigator, elucidating mechanisms of diabetic bone disease in order to reduce fracture risk in people with diabetes. There is growing recognition that bone disease is a complication of type 2 diabetes mellitus (T2DM). In T2DM, hip fracture risk is increased by more than a third, and after fracture, individuals with T2DM have higher rates of postoperative complications and a higher risk of mortality. Fracture risk is elevated even after controlling for falls, and hip fractures occur despite preserved or higher bone mineral density (BMD). The fat within the bone marrow is proposed to play a pathogenic role in diabetic bone disease, as fat and bone are intimately related within the marrow microenvironment. Adipocytes and osteoblasts share a common mesenchymal stem cell precursor, and adipogenesis could occur at the expense of osteoblastogenesis. Indeed, greater levels of marrow fat content are associated with lower BMD and higher fracture risk. However, it is unknown whether marrow fat can be manipulated to improve diabetic bone disease. Hemoglobin A1c (HbA1c) positively correlates with higher levels of marrow fat, so enhanced glycemic control might normalize marrow fat and improve bone outcomes. Given the widespread prevalence of diabetes and the medical and economic costs of fractures, there is an urgent need to understand diabetic bone disease to identify targeted preventive and therapeutic strategies. During the Career Development Award-2 (CDA-2) period, Dr. Kim’s goal is to acquire the training and implement the studies needed to understand the effects of improved glycemic control on marrow fat and bone health. She will gain expertise in valuable clinical research and translational methods that will position her to become a leader in the field of diabetic bone disease. Dr. Kim will enroll and follow 75 Veterans with poorly controlled T2DM (HbA1c 8.5-12.0%) who are working with their clinicians to improve glycemic control. She will determine the effects of improved glycemic control on bone marrow fat (Aim 1) and the relationship between changes in marrow fat with bone quality and mass (Aim 2). Pursuit of these aims will involve critical training in the design and implementation of a prospective cohort study. Dr. Kim will use advanced and sensitive imaging modalities (including magnetic resonance spectroscopy, high-resolution peripheral quantitative computed tomography) to assess marrow fat and bone outcomes at baseline and then after 1 year of intensified medical management. Dr. Kim will also use cutting edge translational methods to explore the role of osteoblast differentiation as a pathway linking marrow fat and bone outcomes (Aim 3). This will include characterizing circulating osteoblast progenitor cells by flow cytometry and evaluating expression of osteoblast differentiation genes. Training in advanced diabetes and lipid metabolism will allow Dr. Kim to interpret these findings and gain important insights into the pathogenesis of diabetic bone disease. This research is expected to advance understanding of marrow fat behavior, which may lead to targeted preventive and therapeutic strategies for diabetic bone disease and osteoporosis. Dr. Kim has assembled a diverse mentorship team comprised of experts in osteoporosis, metabolism, epidemiology, biostatistics, and radiology. Her training will involve a combination of individual tutorials with her mentors and scientific advisors, hands-on experience, and formal coursework. The proposed research will provide Dr. Kim with preliminary data for a larger and longer-term prospective study of diabetic bone disease, which she will propose in a Merit Review application submitted before the end of the CDA-2 period. Dr. Kim is committed to improving the health care of Veterans through clinical research, and with her proposed research and training, she will develop a thriving research program at the VA.

Kim 博士的长期目标是成为一名 VA 医师研究员，阐明糖尿病骨的机制 人们越来越认识到骨病。 是 2 型糖尿病 (T2DM) 的并发症。在 T2DM 中，髋部骨折的风险增加超过 1%。 第三，骨折后，T2DM 患者术后并发症发生率较高，且 即使在控制跌倒后，死亡风险也会升高，尽管如此，还是会发生髋部骨折。 骨髓内的脂肪被认为可以发挥保留或更高的骨矿物质密度（BMD）。 在糖尿病骨病中的致病作用，因为脂肪和骨在骨髓内密切相关 脂肪细胞和成骨细胞具有共同的间充质干细胞前体，并且 事实上，脂肪生成可能以成骨细胞生成为代价，骨髓脂肪含量更高。 与较低的 BMD 和较高的骨折风险相关。然而，尚不清楚骨髓脂肪是否可以减少。 改善糖尿病性骨病的方法与糖化血红蛋白 (HbA1c) 呈正相关。 骨髓脂肪水平，因此加强血糖控制可能会使骨髓脂肪正常化并改善骨骼结果。 鉴于糖尿病的广泛流行以及骨折的医疗和经济成本， 迫切需要了解糖尿病骨病以确定有针对性的预防和治疗策略。 在职业发展奖 2 (CDA-2) 期间，Kim 博士的目标是获得培训和 实施所需的研究，以了解改善血糖控制对骨髓脂肪和骨骼的影响 她将获得宝贵的临床研究和转化方法方面的专业知识，这将使她能够 成为糖尿病骨病领域的领导者，Kim 博士将招募并跟踪 75 名病情不佳的退伍军人。 她将与他们的忠诚者一起努力改善血糖控制，控制 T2DM（HbA1c 8.5-12.0%）。 确定改善血糖控制对骨髓脂肪的影响（目标 1）以及两者之间的关系 骨髓脂肪随骨质量和质量的变化（目标 2）将涉及关键的训练。 Kim 博士将使用先进且灵敏的成像技术来设计和实施一项前瞻性队列研究。 模态（包括磁共振波谱、高分辨率外周定量计算 断层扫描）以评估基线时以及一年强化医疗后的骨髓脂肪和骨骼结果 Kim 博士还将使用尖端的转化方法来探索成骨细胞的作用。 分化作为连接骨髓脂肪和骨骼结果的途径（目标 3）。 通过流式细胞术检测循环成骨细胞祖细胞并评估成骨细胞分化的表达 晚期糖尿病和脂质代谢方面的培训将使金博士能够解释这些发现并 这项研究有望推进对糖尿病骨病发病机制的重要了解。 了解骨髓脂肪的行为，这可能会导致有针对性的预防和治疗策略 金博士组建了一支多元化的指导团队，其中包括糖尿病骨病和骨质疏松症。 她的培训将涉及骨质疏松症、新陈代谢、流行病学、生物统计学和放射学方面的专家。 将个人教程与她的导师和科学顾问、实践经验和正式课程相结合 拟议的研究将为金博士提供更大规模、更长期的初步数据。 糖尿病骨病的前瞻性研究，她将在提交的优点审查申请中提出 在 CDA-2 期结束之前，Kim 博士致力于通过以下方式改善退伍军人的医疗保健。 临床研究，并通过她提议的研究和培训，她将在 弗吉尼亚州。