摘要目的 探讨社会隔离对小鼠空间和非空间认知功能的影响.方法 选取健康生后21天昆明小鼠,按照随机区组化分为对照组、隔离2周组、隔离4周组、隔离8周组和隔离2周后群居组,每组10只.隔离2周组、隔离4周组和隔离8周组分别于生后21天起,单笼饲养2周、4周和8周,隔离2周后群居组于隔离2周后恢复群居直至成年,对应相同月龄的正常饲养小鼠作为对照组.所有实验动物于干预后进行物体识别实验和物体定位实验测试,来评估其空间和非空间认知功能改变.结果 在物体识别实验中,与相应对照组相比,隔离2周、隔离4周和隔离8周小鼠的辨别指数[分别为(-0.03±0.003),(-0.11±0.02),(-0.21±0.02)],明显低于对照组[(分别为(0.29±0.03),(0.13±0.07),(0.09±0.03),p＜0.05]；在物体定位实验中,与相应对照组相比,隔离2周、隔离4周和隔离8周小鼠的辨别指数[分别为(-0.15±0.02),(-0.30±0.02),(-0.32±0.02)],明显低于对照组[(分别为(0.33±0.02),(0.41 ±0.03),(0.27±0.04),P＜0.05].隔离2周后群居组小鼠的辨别指数都无统计学意义.结论 小鼠隔离2周、4周和8周后,空间和非空间认知功能降低,而隔离2周后恢复的群居生活能够改善小鼠的空间与非空间认知能力.

abstractsObjective To study the effects of social isolation (SI)on the spatial and nonspatial cognitive ability in mice.Methods The postnatal 21 day kunming mice were divided into control group,SI 2 weeks group,SI 4 weeks group,SI 8 weeks group and SI 2 weeks gregarious group according to randomized block design,with ten animals each.SI 2 weeks group,SI 4 weeks group and SI 8 weeks group were isolated for 2,4 and 8 weeks respectively,SI 2 weeks gregarious group would be housed under normal grouped housing condition after 2 weeks isolation until adult,the relative control groups were the same age as the relative SI and SI gregarious group.All animals were measured the spatial and nonspatial cognitive ability by carrying the object recognition test(ORT) and object location test (OLT) after the treatment.Results In the ORT,compared to the relative control group,the discrimination index in the SI 2 weeks group,SI 4 weeks group and SI 8 weeks group ( ( - 0.03 ± 0.003 ),( - 0.11 ±0.02) and( - 0.21 ± 0.02 ) respectively) were strikingly lower than the relative control group ( ( 0.29 ± 0.03 ),(0.13±0.07) and (0.09 ±0.03) respectively) (P＜0.05).In the OLT,compared to the relative control group,the discrimination index in the SI 2 weeks group,SI 4 weeks group and SI 8 weeks group( ( -0.15 ±0.02),( -0.30± 0.02),( - 0.32 ± 0.02 ) respectively ) were strikingly lower than the relative control group ( (0.33 ± 0.02 ),(0.41 ± 0.03 ),(0.27 ± 0.04)respectively)(P＜ 0.05 ),while the SI 2 weeks gregarious group with the resocialization to the normal housing condition showed no change.Conclusions 2 weeks,4 weeks and 8 weeks isolation on mice lead to the spatial and nonspatial cognition deficits,while the resocialization to the normal housing condition could recover the damage.