不同比例的微量元素摄入对老龄小鼠体质影响的初步实验

目的 探讨某些微量元素间的比值变化与生理功能间的关系.方法 将12月龄SPF昆明种雄性小鼠按体重将小鼠随机分为对照组(不加添加剂)、微量元素Ⅰ组(添加剂中Zn、Li、Li、Se、Mn、Cu、Co含量分别为0.304、0.270、0.088、0.030、0.004、0.072、0.016 mg/kg)、微量元素Ⅱ组(添加剂中Zn、Li、Fe、Se、Mn、Cu、Co含量分别为0.500、0.200、0.980、0.020、0.045、0.045、0.018 mg/kg),使其自由地进食和饮用纯净水.每周测量1次体重.饲养9周后,称量体重,测量胸腺、脾脏、股骨的干、湿重量,并计算胸腺、脾脏的脏器系数;测量右侧股骨长度、外径、骨质厚度和抗折强度,测定股骨骨质中钙、磷的含量.结果 微量元素Ⅰ组、微量元素Ⅱ组和对照组老龄小鼠体重,以及脾脏、胸腺重量及其脏器系数间比较,经方差分析,差异均无统计学意义(P＞0.05).各组老龄小鼠股骨骨质情况(股骨的长度、外径、骨质厚度、抗折强度)由优至劣依次为:微量元素Ⅰ组＞微量元素Ⅱ组＞对照组.与对照组比较,微量元素Ⅰ组老龄小鼠干重以及微量元素Ⅰ组和微量元素Ⅱ组老龄小鼠股骨骨质中钙含量及其所占的百分比较高;微量元素Ⅰ组和微量元素Ⅱ组老龄小鼠股骨骨质中水分含量及其所占的百分比以及微量元素Ⅱ组老龄小鼠股骨骨质中磷含量及其所占的百分比较低,经方差分析和q检验,差异均有统计学意义(P＜0.05).微量元素Ⅱ组老龄小鼠股骨骨质中磷含量及其所占的百分比低于微量元素Ⅰ组,经方差分析和q检验,差异有统计学意义(P＜0.05).结论 本次实验结果表明,Zn、Li、Fe、Se、Mn、Cu、Co微量元素及其比值的变化导致老龄小鼠体内某些生理功能发生了改变,促进其对钙的有效利用,但其机制尚待进一步研究.

Effect of Trace Elements with Different Proportion in Food on Aged Mice Health

Objective To explore the relationship between trace elements proportion in food and health. Methods 45 mice aged 12 month were randomly divided into 3 groups: control group(n=16) and two experimental groups(n=15).The mice in the experimental groups were given Zn, Li, Fe, Se, Mn, Cu, Co in different proportion by food for 60 days, then all mice were sacrificed, thymus weight, spleen weight, thymus coefficient, spleen coefficient, bone indexes were determined. Results Supplementation of the trace elements in food increased the content of Ca2 in the bone of the aged mice and proportion variety of trace elements might induce the changes of thymus weight, spleen weight, spleen coefficient and bone indexes. Conclusion The reasonable proportion of trace elements in food could increase the content of bone Ca2 in aged mice.