Lower body weight or body mass index(BMI)has been known to be higher risk of developing osteoporosis and low-energy fractures via mechanical loading and other factors in both men and women[1].Recently,there have been new insights into the relationships between body composition and bone health.However,most of the previous studies regarding the relative effect of body composition on bone mass yielded
Objective： To observe the effects of red yeast rice（RYR） on blood lipid levels, aortic atherosclerosis（AS）, and plaque stability in apolipoprotein E gene knockout（Apo E-/-） mice. Methods： Twentyfour Apo E-/-mice were fed with a high-fat diet starting from 6 weeks of age. Mice were randomized into three groups（n = 8 in each group）： model group（Apo E-/-group）, RYR group（Apo E-/-＋ RYR group）, and simvastatin group（Apo E-/-＋ simvastatin group）. Eight 6-week-old C57BL/6 mice were assigned as the control group and fed with a basic diet. After 36 weeks, plasma lipids and inflammatory factors were measured. Aortic atherosclerotic lesions by microscope, scanning electron microscope and transmission electron microscope were observed. Plasma levels of interleukin-6（IL-6） and tumor necrosis factor-α（TNF-α） were measured with enzymelinked immunosorbent assay. The level of high sensitivity C-reaction protein（Hs-CRP） was detected by the scattering immunoturbidimetric assay. Protein expression of matrix metalloproteinase-9（MMP-9） and nuclear factor κB（NF-κB） in aorta were tested by immunohistochemistry. Results： Compared with the model group, treatment with RYR significantly decreased the levels of total cholesterol, triglyceride, low-density lipoprotein cholesterol, lipoprotein（a）, and apolipoprotein B100 in Apo E-/-mice（P〈0.01）. Compared with the model group, treatment with RYR decreased the levels of Hs-CRP, IL-6, and TNF-α（P〈0.01）. RYR also reduced the protein levels of NF-κB and MMP-9 of the aorta. Conclusions： RYR has the anti-atherosclerotic and stabilizing unstable plaque effects. The mechanism might be related to the inflammatory signaling pathways.
目的探讨3.0 T MRI水-脂成像动态评估原发性骨质疏松鼠模型骨髓脂肪含量的可行性。方法 18只12周龄雌性SD大鼠随机分为假手术组（SHAM）及去卵巢组（OVX）,每组9只。分别在基线（0周）、6、12周行MRI水-脂分离成像及骨密度（BMD）扫描,获取骨髓脂肪分数（FF）及BMD值。第12周时行ELISA测定血清17β雌二醇及骨转换标记物（BALP及CTX-Ⅰ）。评价两次扫描FF测量的可重复性及不同观察者的一致性。结果两次MRI扫描FF值变异系数为2.95%。两位独立观察者测量FF值,组内相关系数为0.928（95%CI为0.841～0.967,P〈0.001）。第6、12周时,OVX组FF较基线时分别增高40.0%、69.4%（P值均〈0.001）。第6周始组间FF差异有统计学意义,而组间BMD至第12周时差异有统计学意义（P值均〈0.001）。OVX组血清17β雌二醇降低67.2%,且BALP及CTX-Ⅰ标记物均较SHAM组增高,呈高转换型。结论大鼠去势12周骨质疏松模型可建立,MRI水-脂成像可动态评估骨髓脂肪含量。
