来自骨的IGF-I调节成年雄性小鼠的放射性骨生长
Johan Svensson1, Klara Sjögren1, Lina Lawenius1
1Centre for Bone and Arthritis Research, Department of Internal Medicine and Clinical Nutrition, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, 413 45 Gothenburg, Sweden.
Endocrinology
|July 5, 2023
概括
成年小鼠的局部胰岛素样生长因子-I (IGF-I) 对于保持皮质骨宽度和强度至关重要. 在骨中不激活IGF-I,但不是肝脏,在老年小鼠中减少骨尺寸和硬度.
科学领域:
- 骨生物学 骨生物学 骨生物学
- 内分泌学 在内分泌学.
- 老年学是一门学科.
背景情况:
- 衰老会降低胰岛素样生长因子I (IGF-I) 水平,这是一种影响骨健康和骨折风险的因素.
- 之前的研究表明,肝脏衍生的IGF-I会影响骨,但在成年人中局部骨IGF-I的作用尚不清楚.
研究的目的:
- 为了研究IGF-I在成年雄性小鼠骨中可诱导的局部失活对骨参数的影响.
- 为了区分循环与局部产生的IGF-I在成人骨维护中的作用.
主要方法:
- 利用一种可诱导他莫西芬的Cre-lox系统 (CAGG-CreER) 专门在成年小鼠的骨细胞中禁用IGF-I基因.
- 在9个月的基因失活后,在14个月大时使用微计算机断层扫描和3点曲试验评估骨表型.
主要成果:
- 在骨中诱导性IGF-I无活化显著减少骨IGF-I表达,而不会改变血清IGF-I或体重.
- 在诱导IGF-I淘汰赛小鼠中,皮层骨尺寸 (周骨和内骨周围) 和计算骨强度都下降了.
- 青叶皮层骨硬度减少,而状骨体积分数保持不变.
结论:
- 在皮层骨内的局部IGF-I对于成年雄性小鼠的辐射骨生长和强度至关重要.
- 这些发现突出了循环和局部产生的IGF-I对老化中的骨表型的独特贡献.
- 准局部骨IGF-I可能为与年龄相关的骨损失和骨折预防提供治疗策略.
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