首页> 美国卫生研究院文献>Journal of Anatomy and Physiology >A fractionator study of the effects of undernutrition during early life on rat Purkinje cell numbers (with a caveat on the use of nucleoli as counting units).
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A fractionator study of the effects of undernutrition during early life on rat Purkinje cell numbers (with a caveat on the use of nucleoli as counting units).

机译:一项关于早期营养不足对大鼠浦肯野细胞数量影响的分馏研究(但需注意使用核仁作为计数单位)。

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摘要

The effects of varying periods of general protein-calorie undernutrition during early life on Purkinje cells in the cerebellum of the rat were examined. In Experiment 1, animals were undernourished from d 18 of gestation until either d 30 or d 60 of postnatal age, followed in some cases by a period of nutritional rehabilitation. In Experiment 2, rats were undernourished from conception until d 30 postnatally, followed by a period of rehabilitation until 60 d of age. The 'fractionator' method was employed to estimate the total number of cerebellar Purkinje cell nucleoli. If each cell has one nucleolus, this number is equal to the number of Purkinje cells. In Experiment 1, the estimated mean number of Purkinje cell nucleoli varied between 188,000 and 273,000 for the groups of animals studied. However, the interanimal variation was large and 2-way analysis of variance tests failed to reveal any statistically significant age, nutrition or interaction effects. In Experiment 2, rats killed immediately after the period of undernutrition possessed significantly fewer Purkinje cell nucleoli than age-matched controls. This did not represent a real decrease in cell number. Instead, the result could be explained by a change of Purkinje cell morphology in undernourished rats. The change included nucleolar regression. Nutritionally rehabilitated animals had similar numbers of nucleoli to control rats. It is concluded that the levels and periods of undernutrition used in these experiments did not affect significantly the total numbers of cerebellar Purkinje neurons.
机译:研究了早期生命期间不同阶段的一般蛋白质热量不足营养对大鼠小脑Purkinje细胞的影响。在实验1中,动物从妊娠第18天开始营养不足,直到出生后30天或60天,在某些情况下都进行了营养康复。在实验2中,从受孕开始直到出生后30天为止,大鼠的营养不足,然后经过一段康复期直到60天。 “分馏”法用于估计小脑浦肯野细胞核仁总数。如果每个细胞有一个核仁,则该数目等于浦肯野细胞的数目。在实验1中,对于所研究的动物组,Purkinje细胞核仁的估计平均数在188,000和273,000之间变化。但是,动物间的差异很大,方差测试的2通分析未能显示出任何具有统计学意义的年龄,营养或相互作用影响。在实验2中,营养不良后立即杀死的大鼠比年龄匹配的对照组具有明显更少的Purkinje细胞核仁。这并不代表细胞数量的真正减少。取而代之的是,该结果可以通过营养不良大鼠的浦肯野细胞形态改变来解释。变化包括核仁退缩。营养康复的动物的核仁数量与对照组的相似。结论是,这些实验中使用的营养不足的水平和时间段不会显着影响小脑浦肯野神经元的总数。

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