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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Normal aging involves altered expression of growth factors in the rat choroid.
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Normal aging involves altered expression of growth factors in the rat choroid.

机译:正常衰老涉及大鼠脉络膜中生长因子表达的改变。

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Normal aging of the choroid results in morphological and physiological changes. The growth factors that mediate these changes are unclear. Vascular endothelial growth factor (VEGF) binds its receptor 2, VEGFR2, to mediate vascular remodeling. Pigment epithelium-derived factor (PEDF) is an inhibitor of angiogenesis produced by retinal pigmented epithelial (RPE) cells. Angiopoietin1 (Ang-1) binds its receptor Tie-2 to recruit mural cells to stabilize vessels. To investigate age-related changes in growth factor activities in aged choroidal vasculature, real-time polymerase chain reaction and protein analysis of VEGF, VEGFR2, PEDF, Ang-1, and Tie-2 were completed on rat choroid/RPE complexes at 8, 22, and 32 months. VEGF messenger RNA (mRNA) peaked at 22 months, whereas protein levels were significantly decreased by 32 months. Both mRNA and protein levels of PEDF were significantly decreased with age. Ang-1 protein levels were not altered, whereas Tie-2 had increased protein levels with age. These results indicate that normal aging involves temporal changes in many of the growth factors common in age-related disease.
机译:脉络膜正常衰老会导致形态和生理变化。介导这些变化的生长因子尚不清楚。血管内皮生长因子(VEGF)结合其受体2,VEGFR2,介导血管重塑。色素上皮衍生因子(PEDF)是视网膜色素上皮(RPE)细胞产生的血管生成抑制剂。血管生成素1(Ang-1)结合其受体Tie-2募集壁画细胞以稳定血管。为了研究老年脉络膜血管中生长因子活性的年龄相关变化,在8岁时完成了大鼠脉络膜/ RPE复合物的实时聚合酶链反应和VEGF,VEGFR2,PEDF,Ang-1和Tie-2的蛋白质分析。 22和32个月。 VEGF信使RNA(mRNA)在22个月达到峰值,而蛋白质水平在32个月时显着下降。 PEDF的mRNA和蛋白水平均随着年龄的增长而显着降低。 Ang-1蛋白水平没有改变,而Tie-2蛋白则随着年龄的增长而增加。这些结果表明,正常衰老涉及与年龄有关的疾病中常见的许多生长因子的时间变化。

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