长期能量限制对成年雌性大鼠生殖寿命的影响

目的探讨长期能量限制对成年雌性大鼠生殖寿命的影响。方法 6月龄雌性SD大鼠30只,分为正常饮食组、能量限制(CR)20%组和CR40%组,记录正常饮食(NC)组每日摄食量,并将此摄食量的80%和60%分别喂养CR20%组和CR40%组大鼠,监测大鼠体重及动情周期变化,12个月后取大鼠卵巢。卵巢组织切片由苏木精-伊红染色,观察卵泡储备数量和不同发育阶段的卵泡比例。结果 NC组体重持续上升,而CR20%组体重小幅增加,CR40%组体重持续下降。CR40%组大鼠的卵泡储备数量(105.7±9.5)和原始卵泡数(55.0±6.8)与NC组(51.2±5.4,18.3±3.7)相比差异均有统计学意义(P<0.001,P<0.001),原始卵泡比例(52.1%±2.9%)与对照组(35.8%±5.5%)相比差异有统计学意义(P<0.001),而成熟卵泡比例(6.8%±1.9%)和发育卵泡比例(41.2%±3.0%)与NC组(15.6%±6.2%,48.9%±4.2%)相比差异亦有统计学意义(P<0.001,P<0.05)。CR20%组卵泡储备数量和不同发育阶段的卵泡比例与NC组相比差异无统计学意义。结论长期能量限制可能通过抑制卵泡发育启动、减少发育卵泡和成熟卵泡的数量,从而减少卵泡的消耗,有益于生殖寿命延长。

Effect of long-term calorie restriction on the reproduction of female rats

Objective To investigate the effects of Long-term calorie restriction on the extension of ovarian reproductive life in female SD rats.Methods 30 mature female SD rats were divided into three groups:normal control(NC)(fed standard rodent chow ad libitum),20% calorie restriction(CR20%) group(fed with 80% food of NC group),and 40% calorie restriction(CR40%) group(fed withn 60% food of NC group).The body mass was monitored monthly,and the estrous cycle patterns were determined by vaginal smears every two months...