The effects of Sahyangsohapwon on the affective reactivity of rats were studied with open-field behavior. Sample group was treated with the medicine for 8 weeks, whereas control group was treated with the vehicle.
The effects of Sahyangsohapwon on the enhancement of learning and memory of AD model rats were studied with two-way avoidance task. Sample group electrically lesioned on nbM(nucleus basalis of Meynert) was treated with the medicine for 8 weeks, whereas control group with nbM lesion and sham group with the sham operation were treated with the vehicle.
1. In the open-field behavior task, the start latency from start box was measured 27.08±7.51sec in control group,. 23.15±5.98sed in sample group. Rats in sample group showed a tendency of shortedned latency going out to a strange place compared with those in control group, but with no statistical significance(p〉0.05).
2. In the open-field behavior task, the number of locomotion crossing the grid lines was measured 84.54±3.55 in control group, 116.93±6.41 in sample group. There was an increased locomotion in sample group compared with control group with statistical significance(p〈0.01). This can be interpreted as rats in sample group showed lowerd anxiety under a strange environment.
3. In the open-field behavior task, the rearing number was measured 7.46±0.57 in control group, 10.13±0.95 in sample group. There was an increased rearing in sample group compared with control group with statistical significance(p〈0.05). This can also be interpreted as rats in sample group showed lowerd anxiety under a strange environment.
4. In the open-field behavior task, the number of crossing behavior was measured 5.54±1.50 in control group, 9.20±1.67 in sample group. There was a increasing tendency of crossing behavior in sample group compared with control group, but with no statistical significance(p〈0.05).
5. In the open-field behavior task, the total activity was measured 97.54±4.70 in control group, 136.27±792 in sample group. There was an increased total activity in sample group compared with control group with statistical significance(p〈0.01). This can also be interpreted as rats in sample group showed lowerd anxiety under a strange environment.
6. In the analysis of effects on the learning and memory in AD model rats with two-way avoidance task, the response latency was measured 6717±134msec in the 1st session, 5416±160msec in the 2nd session, 5252±148msec in the 3rd session in control group. It was measured 6724±155msec in the 1st session, 4642±139msec in the 2nd session, 4914±148msec in the 3rd session in sample group and 4357±144msec in the 1st session, 3125±115msec in the 2nd session, 3091±98msec in the 3rd session in sham group.
There were differences between sham group and nbM lesioned groups with statistical significance in post hoc analysis(p〈0.000). And in the 2nd session, there was a reduction of latency on sample group compared with control group with statistical significance (p〈0.000). This showed that sample group had better learning capacity than control group.
7. In the analysis of effects on the learning and memory in AD model rats with two-way avoidance task, the number of avoidance response was measured 5.85±1.41 in the 1st session, 14.23±2.89 in the 2nd session, 15.69±2.56 in the 3rd session in control group. It was measured 7.92±1.94 in the 1st session, 16.83±2.29 in the 2nd session, 15.42±2.81 in the 3rd session in sample group and 14.38±1.62 in the 1st session, 22.88±0.89 in the 2nd session, 23.88±1.64 in the 3rd session in sham group.
There were differences between sham group and nbM lesioned groups with statistical significance in post hoc analysis(p〈0.001). But between control and sample group, there was no significant difference.
With the experimental results above, Sahyangsohapwon can be supposed to have the enhancing effects on the affect reactivity and learning with memory of AD model rats induced by electroyte injury of nbM.
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