Effects of adipose-derived mesenchymal stem cells over-expressing glial cell line-derived neurotrophic factor on electrically injured sciatic nerve of rats
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摘要: 目的 观察持续过表达胶质细胞源性神经营养因子(GDNF)的脂肪源性间充质干细胞(ADSC)对大鼠坐骨神经电刺激损伤后肢体运功功能恢复和神经修复的影响。 方法 取5只SD大鼠制备过表达GDNF的ADSC。取150只大鼠按照随机数字表法分为正常对照组、GDNF-ADSC组、ADSC组、GDNF组、生理盐水组5组,每组30只。正常对照组不作处理,进行常规饲养;GDNF-ADSC组、ADSC组、GDNF组、生理盐水组大鼠在右后肢大腿造成坐骨神经电损伤,伤后即刻向损伤神经表面分别局部注射100 μL过表达GDNF的ADSC悬液(细胞浓度1×107个/mL)、ADSC细胞悬液(细胞浓度1×107个/mL)、GDNF溶液(100 mg/L)、生理盐水。伤后第1~8周,每组取6只大鼠进行后肢步幅测量,并观察其伤后第8周的坐骨神经形态;伤后第4周,采用蛋白质印迹法检测各组剩余大鼠坐骨神经的GDNF蛋白表达量。对数据行单因素方差分析、重复测量方差分析、SNK检验。 结果 GDNF-ADSC组、ADSC组、GDNF组、生理盐水组大鼠在伤后各时相点后肢步幅均明显短于正常对照组(
P 值均小于0.05);GDNF-ADSC组大鼠在伤后第3~8周、ADSC组大鼠在伤后第3、5、7周、GDNF组大鼠在伤后第3、5、7、8周后肢步幅均明显长于生理盐水组(P 值均小于0.05);伤后第4~8周,GDNF-ADSC组大鼠后肢步幅分别为(10.83±0.97)、(13.25±1.40)、(12.86±1.42)、(14.06±1.50)、(15.09±1.17)cm,明显长于ADSC组的(8.90±0.82)、(9.03±0.57)、(9.27±0.36)、(9.86±0.36)、(9.52±0.58)cm,和GDNF组的(8.87±0.69)、(8.51±1.18)、(9.34±0.87)、(9.76±0.67)、(9.50±1.22)cm(P 值均小于0.05)。伤后第8周,与正常对照组比较,生理盐水组大鼠坐骨神经有髓神经纤维数明显减少,GDNF-ADSC组、ADSC组、GDNF组有髓神经纤维数明显增加;GDNF-ADSC组、ADSC组、GDNF组、生理盐水组大鼠坐骨神经轴突直径明显缩短,髓鞘厚度明显增加(P 值均小于0.05)。GDNF-ADSC组大鼠坐骨神经有髓神经纤维数为(31.2±0.8)个,明显多于ADSC组的(23.7±2.7)个、GDNF组的(22.3±2.7)个、生理盐水组的(9.3±2.8)个(P 值均小于0.05);轴突直径以上4组相近(P 值均大于0.05);GDNF-ADSC组大鼠坐骨神经髓鞘厚度为(3.41±0.34)μm,较ADSC组的(2.64±0.37)μm及GDNF组的(2.41±0.34)μm增加(P 值均小于0.05)。伤后第4周,生理盐水组、ADSC组、GDNF组、GDNF-ADSC组大鼠坐骨神经GDNF蛋白表达量明显高于正常对照组(P 值均小于0.05);GDNF-ADSC组大鼠GDNF蛋白表达量明显高于生理盐水组、ADSC组、GDNF组(P 值均小于0.05)。 结论 过表达GDNF蛋白的ADSC对大鼠坐骨神经电损伤后肢体运动功能的恢复及神经修复具有明显的促进作用。-
关键词:
- 烧伤,电 /
- 胶质细胞源性神经营养因子 /
- 干细胞 /
- 坐骨神经 /
- 慢病毒转染
Abstract: Objective To observe the effects of adipose-derived mesenchymal stem cells (ADSCs) with continous over-expression of glial cell line-derived neurotrophic factor (GDNF) on the motor function recovery and nerve regeneration of sciatic nerve of rats after electrical injury. Methods Five SD rats were collected to prepare ADSCs with over-expression of GDNF. One hundred and fifty SD rats were divided into normal control group (N), GDNF-ADSCs group (GA), ADSCs group (A), GDNF group (G), and physiological saline group (P) according to the random number table, with 30 rats in each group. Rats in group N were routinely fed without treatment, and rats in the other 4 groups were inflicted with electrical injury on sciatic nerve of thigh of the right hind leg. Rats in groups GA, A, G, and P were respectively injected with 100 μL suspension of ADSCs with over-expression of GDNF (1×107 cells per mL), 100 μL ADSCs suspension (1×107 cells per mL), 100 μL GDNF solution (100 mg/L), and 100 μL physiological saline to the surface of the injured nerves immediately after injury. Six rats of each group were collected for measuring hind limb stride from post injury week (PIW) 1 to 8, and morphology of the sciatic nerves was observed in PIW 8. In PIW 4, the protein expression of GDNF of sciatic nerves of the rest rats in each group was determined with Western blotting. Data were processed with one-way analysis of variance, analysis of variance of repeated measurement, and SNK test. Results Compared with that of group N, the hind limb stride values in groups GA, A, G, and P were significantly lower at each time point (withP values below 0.05). Compared with those of group P, the hind limb stride values in group GA from PIW 3 to 8, in group A in PIW 3, 5, and 7, and in group G in PIW 3, 5, 7, and 8 were significantly longer (withP values below 0.05). The hind limb stride values in group GA from PIW 4 to 8 were respectively (10.83±0.97), (13.25±1.40), (12.86±1.42), (14.06±1.50), and (15.09±1.17) cm, which were significantly longer than those in group A [(8.90±0.82), (9.03±0.57), (9.27±0.36), (9.86±0.36), and (9.52±0.58) cm] and group G [(8.87±0.69), (8.51±1.18), (9.34±0.87), (9.76±0.67), and (9.50±1.22) cm], withP values below 0.05. Compared with that of group N, the number of myelinated nerve fibers of sciatic nerves was obviously decreased in group P but obviously increased in groups GA, A, and G; the diameter of axons was obviously shorter, and the myelin thickness was obviously increased in groups GA, A, G, and P in PIW 8 (withP values below 0.05). The number of myelinated nerve fibers in group GA was 31.2±0.8, which was significantly higher than that in group A (23.7±2.7), group G (22.3±2.7), or group P (9.3±2.8), withP values below 0.05. The diameter values of axons among groups P, A, G, and GA were similar (withP values above 0.05). The myelin thickness of rats in group GA was (3.41±0.34) μm, which was significantly thicker than that in group A [(2.64±0.37) μm] or group G [(2.41±0.34) μm], withP values below 0.05. In PIW 4, the protein expression of GDNF of sciatic nerves was significantly higher in groups P, A, G, and GA than in group N (withP values below 0.05), and the protein expression of GDNF in group GA was significantly higher than that in group P, A, or G (withP values below 0.05). Conclusions ADSCs over-expressing GDNF protein can obviously promote the motor function recovery and nerve regeneration of sciatic nerve of rats after electrical injury.
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