摘要
目的探讨膳食补充营养素可能对持续高 +Gz暴露后小鼠脑功能的影响 ,用迷宫实验评价脑功能状况。方法将小鼠分为对照组 (A组 ) ,+Gz暴露但不补充营养素组 (B组 )及 +Gz暴露并且补充营养素组(C组 )。每组 1 2只小鼠。A组不作 +Gz暴露 ,B组和C组 +1 0Gz暴露 8min。B组在 +Gz暴露前 3h以 0 .3ml蒸馏水灌胃。C组在 +Gz暴露前 1d饮用强化VitB6 的水 ,+Gz暴露前 3h以 0 .3ml混合氨基酸液灌胃。记录 3组动物的迷宫实验成绩。迷宫实验后立即摘眼球取血 ,测定氨基酸 ;断头取脑组织 ,制成组织匀浆 ,测定单胺类递质。结果 +Gz暴露后 ,与对照组相比B组迷宫实验的完成时间显著延长 ,错误次数增加 ,C组迷宫实验成绩有改善的趋势 ,即完成时间缩短 ,错误次数减少。与B组相比 ,C组小鼠脑组织中 5 羟色胺 (5 HT)与多巴胺 (DA)的比值显著下降。B组和C组脑内γ谷氨酰基转移酶 (GGT)活性显著增加。结论持续高 +Gz暴露显著降低小鼠迷宫实验成绩。膳食补充某些氨基酸和VitB6 有改善迷宫成绩的趋势 ,可能与小鼠脑组织中 5
Objective To explore the possible effects of nutritional supplements on brain function as reflected by Water Maze test performance in mice after +Gz exposure.Method Mice were arranged into control group (group A),+Gz group without nutritional supplementation (group B) and +Gz plus nutritional supplementation group (group C).Each group contains 12 mice.Mice in group A were not exposed to +Gz while mice in both group B and group C were exposed to 8 min +10 Gz.Distilled water was gavaged to group B mice 3 h before +Gz exposure.On the day before +Gz exposure pyridoxol fortified water was given and 3 h before exposure mixed amino acids solution were gavaged to group C mice.Water Maze test was done and scores were recorded in all groups.After the Water Maze test was completed,blood was collected through the eyes for serum amino acid determinations and brain tissue was collected by decollation for monoamine determination and γ glutamyl transferase (GGT) activity evaluation. Result After +Gz exposure,longer completion time and more mistakes were observed in Water Maze test in group B as compared with group A and a trend of improvement in group C was noticed. The ratio of brain 5 HT to dopamine(DA) was significantly reduced in group C as compared with group B.Gamma glutamyl transferase (GGT) activity in brain tissue in group C and group B increased significantly. Conclusion High sustained +Gz exposure significantly reduces Water Maze test performance in mice (longer completion time and more mistakes).It seems that there is a trend of improvement in Water Maze performance in mice in dietary nutritional supplementation group,which might be due to significant reduction in ratio of brain 5 HT to DA in mice with nutritional supplementation.
出处
《航天医学与医学工程》
CAS
CSCD
北大核心
2003年第2期79-82,共4页
Space Medicine & Medical Engineering
