Sarcopenia accelerates at advanced ages in Fisher 344xBrown Norway rats.

Sarcopenia accelerates at advanced ages in Fisher 344xBrown Norway rats.
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DOI:
10.1093/gerona/63.9.921
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发表时间:
2008-09
期刊:
The journals of gerontology. Series A, Biological sciences and medical sciences
影响因子:
--
通讯作者:
Aiken JM
Aiken JM
中科院分区:
其他
文献类型:
--
作者:
Lushaj EB;Johnson JK;McKenzie D;Aiken JM

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虽然与年龄相关的肌肉质量和力量的丧失是一个不可避免的过程,但它的发生和发展还没有得到很好的证实。在这里,我们定义了一个健康的衰老动物模型,Fisher 344×Brown挪威大鼠的石棺减少的发生和发展。对5个月龄的股外侧肌、股直肌和股内侧肌(其中3个股四头肌)以及12-39个月龄之间的3个月间隔进行分析。我们发现,随着年龄的增长,肌肉质量和纤维数量下降,纤维萎缩和非肌肉组织增加。直到晚年(30-33个月)才观察到纤维数量和肌肉质量的显著变化,并且是同时发生的,而纤维横截面积(CSA)从最大CSA(24个月)开始逐渐下降。在30到36个月之间发现的骨钙素下降没有持续到39个月,可能是由于I型纤维比例的增加。
Although the age-dependent loss of muscle mass and strength, sarcopenia, is an inevitable process, its onset and progression are not well established. Here we defined the onset and the progression of sarcopenia in a healthy aging animal model, Fisher 344×Brown Norway rats. Vastus lateralis, rectus femoris, and vastus medialis muscles (three of the quadriceps muscles) were analyzed at 5 months of age and at 3-month intervals between 12 and 39 months of age. We found an age-dependent decline in muscle mass and fiber number and an increase in fiber atrophy and nonmuscle tissue. Significant changes of fiber number and muscle mass were not observed until very late in life (30–33 months) and were concurrent, whereas fiber cross-sectional area (CSA) gradually declined from maximum CSA (24 months). Sarcopenic declines identified between 30 and 36 months did not continue to 39 months, possibly due to the increased proportion of type I fibers.
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发表时间: 1996-01-01
影响因子: 5.1
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