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1、汉防己甲素对大鼠急性脊髓损伤后bcl-2和bax表达的影响罗春山,田晓滨,汪雷,李波,彭智,周焯家,简月奎,赵伟峰(550001贵阳,贵州省人民医院骨科)[摘要]目的观察汉防己甲素(tetrandrine,Tet)对大鼠急性脊髓损伤后bcl-2和bax表达的影响,探讨其对脊髓损伤的作用机制。方法成年SD大鼠100只,分为4组:假手术组10只,损伤对照组、甲基强的松龙(methylprednisolone,MP)治疗组、Tet治疗组各30只。胸8、9椎板切除后损伤对照组、MP治疗组、Tet治疗组用加速压迫型Allen’s打击法制成脊髓损伤模型。MP和Tet治疗组动物于制模前、
2、伤后24h和48h尾静脉分别注射MP和Tet。各组大鼠于术后8h,1、3、7、14d行运动功能BBB(Basso-Beattie-Bresnahanscore)评分,取损伤段脊髓行石蜡切片HE染色,观察脊髓组织的形态结构变化,免疫组织化学染色检测细胞凋亡因子bcl-2、bax表达。结果伤后7、14dMP、Tet治疗组大鼠运动功能评分显著高于损伤对照组(P<0.05),各时间点MP组与Tet治疗组评分无统计学意义(P>0.05);MP、Tet治疗组脊髓组织损害较损伤对照组轻,术后8h至14d动态观察,3~7d损伤表现最为严重,达到损伤高峰期;假手术组中bax、bcl-2阳性细
3、胞数较少,MP组与Tet治疗组bax阳性细胞数少于损伤对照组(P<0.05),而bcl-2阳性细胞数多于损伤对照组(P<0.05)。结论汉防己甲素可通过增加bcl-2表达和降低bax表达来抑制急性脊髓损伤后神经细胞的凋亡,有益于脊髓组织的保护,促进运动功能的恢复。[关键词]粉防己碱;急性;脊髓损伤;基因,bcl-2;bcl-2相关X蛋白质[中图法分类号][文献标志码]AInfluenceofTetrandrinetetrandrineontheexpressionofBcl-2andBaxexpressionsinratswithspinalcordinjuryLuoChu
4、nshan,,TianXiaobin,,WangANGLei,,LiBo,,PengZhi,,ZhouZuojia,,JianYuekui,,ZhaoWeifeng(DepartmentofOrthopaedics,ThePeople’sHostpitalofGuizhouProvince,Guiyang,GuizhouProvince,550001,China)[Abstract]ObjectiveToobservetheinfluenceoftetrandrine(Tet)ontheexpressionsofbclBcl-2andbBaxinratswithspinal
5、cordinjuryandtostudyitsmechanism.MethodsAtotalof100SDratswererandomlydividedinto:sham-operationgroup(groupA,n=10),spinalcordinjurycontrolgroup(groupB,n=30),methylprednisolonegroup(MP)group(groupC,n=30)andtetrandrine(Tet)group(groupD,n=30).ThemodifiedAllenmethodwasadoptedtomakeestablishthem
6、odelsofT9spinalcordinjuryingroupsBandCandDgroup.TheanimalsofgroupDreceived1%22.5mg/kgTetthroughtailveinin24and48hafteroperation,thoseofgroupBwereinjectedwithnormalsalineatsamevolumeasingroupD,andtheratsfromgroupCweregivenatailveininjectionof90mg/kgMPbeforeand24and48hafterinjury.BBBscorewas
7、recordedat8h24h,and1,3d,5d,7d,and14dafteroperationrespectively.SixratsfromeachgroupwerekilledimmediatelyafterBBBscoring,andTthesamplesweretakenfromthespinalcordinjurysitesat8h,1d,3d,7d,14d,testedbyforHEstaining.formorphologyanddetectedtTheexpressionlevelsofBcl