目的探讨磷脂酰肌醇-3激酶(PI3K)/蛋白激酶B(Akt)/FoxO1和白细胞介素17(IL-17)与自身免疫性脑脊髓炎(EAE)发病的相关机制。方法将C57BL/6小鼠60只随机分为对照组和模型组(EAE),每组30只。采用髓鞘少突胶质细胞糖蛋白(MOG35~55)联合完全...目的探讨磷脂酰肌醇-3激酶(PI3K)/蛋白激酶B(Akt)/FoxO1和白细胞介素17(IL-17)与自身免疫性脑脊髓炎(EAE)发病的相关机制。方法将C57BL/6小鼠60只随机分为对照组和模型组(EAE),每组30只。采用髓鞘少突胶质细胞糖蛋白(MOG35~55)联合完全弗氏佐剂诱导建立EAE模型。观察各组小鼠的行为学评分,并于评分4分时取各组小鼠的脊髓、脾脏和外周血。HE染色及Luxol fast blue染色观察脊髓炎性细胞浸润及髓鞘脱失情况;脾细胞在体外用a-CD3和MOG35~55分别刺激7 d,收集其上清液,ELISA检测小鼠脾细胞上清液和血清中细胞因子白细胞介素17(IL-17)和干扰素γ(IFN-γ)的含量;流式细胞术检测小鼠脾脏中CD4+IL-17+细胞的百分比;Western blotting检测IL-17及PI3K/Akt/FoxO1在小鼠脊髓中表达。结果与对照组相比,EAE组小鼠行为学评分明显高于对照组(P<0.05);HE染色及Luxol fast blue染色结果显示,EAE组脊髓病理组织表现出炎性浸润和髓鞘脱失显著增多(P<0.05)。ELISA结果显示,EAE组血清中及体外培养脾细胞的上清中IL-17和IFN-γ的含量明显升高。流式结果表明,EAE组小鼠脾细胞中CD4+IL-17+T细胞的百分比明显增加(P<0.05)。Western blotting结果显示,EAE组小鼠脊髓IL-17、磷酸化Akt(p-Akt)蛋白水平明显升高,但磷酸化FoxO1(p-FoxO1)蛋白水平显著降低(P<0.05)。结论 EAE组小鼠脊髓中促炎因子IL-17分泌增加,可能与PI3K/Akt/FoxO1信号通路活化进而激活T细胞功能有关。展开更多
BACKGROUND： Previous studies have shown that p75 neurotrophin receptor plays an important role in peripheral nerve injury. However, the role of p75 neurotrophin receptor in the regeneration of peripheral nerves remai...BACKGROUND： Previous studies have shown that p75 neurotrophin receptor plays an important role in peripheral nerve injury. However, the role of p75 neurotrophin receptor in the regeneration of peripheral nerves remains poorly understood. OBJECTIVE： To study the effect of p75 neurotrophin receptor on facial nerve regeneration. DESIGN, TIME AND SETTING： A randomized controlled experiment was performed in the Regeneration Laboratory of Flinders University, Australia and the Biomedical Laboratory of Dentistry School, Shandong University from March 2005 to February 2006. MATERIALS： Cholera toxin B subunit, fast blue, and biotin rabbit-anti goat IgG were provided by Sigma, USA; goat-anti choleratoxin B subunit ant/body was provided by List Biologicals, USA. METHODS： In p75 neurotrophin receptor knockout and wild type 129/sv mice, the facial nerves on one side were crushed. At days 2 and 4 following injury, regenerating motor neurons in the facial nuclei were labeled by fast blue, and the regenerating axon was labeled by the anterograde tracer choleratoxin B subunit. MAIN OUTCOME MEASURES： Axonal regenerative velocity and number were detected by immunohistochemical staining of choleratoxin B subunit, growth-associated protein, protein gene product 9.5, and calcitonin-gene-related peptide; survival of motor neurons in the facial nuclei was detected by retrograde fast blue. RESULTS： Axonal growth in the facial nerve of p75 neurotrophin receptor knockout mice was significantly less than in wild type mice. At day 7 after injury, the number of regenerating motor neurons in p75 neurotrophin receptor knockout mice remained significantly less than in wild type mice （P 〈 0.05）. The number of positively stained fibers for growth-associated protein-43, protein gene product 9.5, and calcitonin-gene-related peptide in p75 neurotrophin receptor knockout mice was significantly less than in wild type mice （P 〈 0.01）. CONCLUSION： p75 neurotrophin receptor promoted axonal regeneration and enhanced the survival rate of motor neurons following facial nerve injury.展开更多
文摘目的探讨磷脂酰肌醇-3激酶(PI3K)/蛋白激酶B(Akt)/FoxO1和白细胞介素17(IL-17)与自身免疫性脑脊髓炎(EAE)发病的相关机制。方法将C57BL/6小鼠60只随机分为对照组和模型组(EAE),每组30只。采用髓鞘少突胶质细胞糖蛋白(MOG35~55)联合完全弗氏佐剂诱导建立EAE模型。观察各组小鼠的行为学评分,并于评分4分时取各组小鼠的脊髓、脾脏和外周血。HE染色及Luxol fast blue染色观察脊髓炎性细胞浸润及髓鞘脱失情况;脾细胞在体外用a-CD3和MOG35~55分别刺激7 d,收集其上清液,ELISA检测小鼠脾细胞上清液和血清中细胞因子白细胞介素17(IL-17)和干扰素γ(IFN-γ)的含量;流式细胞术检测小鼠脾脏中CD4+IL-17+细胞的百分比;Western blotting检测IL-17及PI3K/Akt/FoxO1在小鼠脊髓中表达。结果与对照组相比,EAE组小鼠行为学评分明显高于对照组(P<0.05);HE染色及Luxol fast blue染色结果显示,EAE组脊髓病理组织表现出炎性浸润和髓鞘脱失显著增多(P<0.05)。ELISA结果显示,EAE组血清中及体外培养脾细胞的上清中IL-17和IFN-γ的含量明显升高。流式结果表明,EAE组小鼠脾细胞中CD4+IL-17+T细胞的百分比明显增加(P<0.05)。Western blotting结果显示,EAE组小鼠脊髓IL-17、磷酸化Akt(p-Akt)蛋白水平明显升高,但磷酸化FoxO1(p-FoxO1)蛋白水平显著降低(P<0.05)。结论 EAE组小鼠脊髓中促炎因子IL-17分泌增加,可能与PI3K/Akt/FoxO1信号通路活化进而激活T细胞功能有关。
基金the Natural Science Foundation of Shandong Province,No. Y2008C54
文摘BACKGROUND： Previous studies have shown that p75 neurotrophin receptor plays an important role in peripheral nerve injury. However, the role of p75 neurotrophin receptor in the regeneration of peripheral nerves remains poorly understood. OBJECTIVE： To study the effect of p75 neurotrophin receptor on facial nerve regeneration. DESIGN, TIME AND SETTING： A randomized controlled experiment was performed in the Regeneration Laboratory of Flinders University, Australia and the Biomedical Laboratory of Dentistry School, Shandong University from March 2005 to February 2006. MATERIALS： Cholera toxin B subunit, fast blue, and biotin rabbit-anti goat IgG were provided by Sigma, USA; goat-anti choleratoxin B subunit ant/body was provided by List Biologicals, USA. METHODS： In p75 neurotrophin receptor knockout and wild type 129/sv mice, the facial nerves on one side were crushed. At days 2 and 4 following injury, regenerating motor neurons in the facial nuclei were labeled by fast blue, and the regenerating axon was labeled by the anterograde tracer choleratoxin B subunit. MAIN OUTCOME MEASURES： Axonal regenerative velocity and number were detected by immunohistochemical staining of choleratoxin B subunit, growth-associated protein, protein gene product 9.5, and calcitonin-gene-related peptide; survival of motor neurons in the facial nuclei was detected by retrograde fast blue. RESULTS： Axonal growth in the facial nerve of p75 neurotrophin receptor knockout mice was significantly less than in wild type mice. At day 7 after injury, the number of regenerating motor neurons in p75 neurotrophin receptor knockout mice remained significantly less than in wild type mice （P 〈 0.05）. The number of positively stained fibers for growth-associated protein-43, protein gene product 9.5, and calcitonin-gene-related peptide in p75 neurotrophin receptor knockout mice was significantly less than in wild type mice （P 〈 0.01）. CONCLUSION： p75 neurotrophin receptor promoted axonal regeneration and enhanced the survival rate of motor neurons following facial nerve injury.
