不同压力高压氧治疗对大鼠脊髓损伤后细胞凋亡的影响

目的 观察不同压力的高压氧(HBO)对大鼠脊髓损伤(spinal cord injury,SCI)后细胞凋亡的影响,探讨HBO治疗SCI的最佳压力.方法 90只SD大鼠采用Allen's打击法造成SCI后随机分为5组:对照组(A组)、0.15 MPa HBO组(B组)、0.20 MPa HBO组(C组)、0.22 MPa HBO组(D组)和0.25 MPa HBO组(E组).损伤后第3、7、14天分别对5组大鼠进行取材,采用Tunel法检测凋亡细胞,光镜下观察,并对结果进行统计学分析;神经功能评价采用开放场地实验评估大鼠后腿运动功能(BBB评分).结果 与A组比较,HBO各压力组在3个时间点凋亡的细胞数有所减少,神经功能有所改善,且差异有统计学意义(P＜0.05).与B组比较,C、D和E组凋亡的细胞数有所减少,BBB评分改善,且差异有统计学意义(P＜0.05).与C组比较,E组于第3和第7天的差异有统计学意义(P＜0.05);第14天的差异无统计学意义(P＞O.05).结论 HBO能抑制SCI后细胞的凋亡,其作用在一定范围内与压力的升高相关.

Abstract：

Objective To study the effects of HBO at different pressures on apoptosis following spinal cord injury in rats and also to investigate ideal pressure value of hyperbaric oxygen(HBO) on spinal cord injury (SCI). Methods The SCI model was established with Allen's weight dropping by using 90 SD rats. Then, the animals were randomly divided into 5 groups following SCI: the control group ( group A); the HBO treatment group at 0. 15 Mpa (group B); the HBO treatment group at 0. 20MPa (group C); the HBO treatment group at 0. 22 Mpa ( group D); the HBO treatment group at 0.25 Mpa ( group E). Segments of injured spinal cord were collected from the animals of the 5 groups for studies on the 3rd, 7th, and 14th days after injury. The apoptosis cells were labeled with Tunel and the neurologic function of the spinal cord was assessed in the open field ( the BBB score ). Results The number of Tunel - positive cells decreased considerably and the BBB score improved significantly in all the animals of the HBO groups when compared with those of group A ( P ＜ 0. 05 ). Same results were found when the group C, group D and group E were compared with group B, with statistical significance( P ＜0. 05). The number of Tunel-positive cells were decreased considerably and the BBB score improved significantly on 3rd and 7th days in group E, when compared with those of group C( P ＜ 0. 05 ), with statistical significance( P ＜ 0. 05 ). However, no statistical significance could be noted on the 14th day (P ＜0.05). Conclusions HBO could inhibit apoptosis in rats following spinal cord injury, which might be correlated with the increase of pressure within a certain range.

Effects of hyperbaric oxygen at different pressures on apoptosis following spinal cord injury in rats

Objective To study the effects of HBO at different pressures on apoptosis following spinal cord injury in rats and also to investigate ideal pressure value of hyperbaric oxygen(HBO) on spinal cord injury (SCI). Methods The SCI model was established with Allen's weight dropping by using 90 SD rats. Then, the animals were randomly divided into 5 groups following SCI: the control group ( group A); the HBO treatment group at 0. 15 Mpa (group B); the HBO treatment group at 0. 20MPa (group C); the HBO treatment group at 0. 22 Mpa ( group D); the HBO treatment group at 0.25 Mpa ( group E). Segments of injured spinal cord were collected from the animals of the 5 groups for studies on the 3rd, 7th, and 14th days after injury. The apoptosis cells were labeled with Tunel and the neurologic function of the spinal cord was assessed in the open field ( the BBB score ). Results The number of Tunel - positive cells decreased considerably and the BBB score improved significantly in all the animals of the HBO groups when compared with those of group A ( P ＜ 0. 05 ). Same results were found when the group C, group D and group E were compared with group B, with statistical significance( P ＜0. 05). The number of Tunel-positive cells were decreased considerably and the BBB score improved significantly on 3rd and 7th days in group E, when compared with those of group C( P ＜ 0. 05 ), with statistical significance( P ＜ 0. 05 ). However, no statistical significance could be noted on the 14th day (P ＜0.05). Conclusions HBO could inhibit apoptosis in rats following spinal cord injury, which might be correlated with the increase of pressure within a certain range.