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。
