鞘内注射驱动蛋白17反义寡核苷酸对骨癌痛小鼠脊髓水平mLin10和NR2B蛋白表达的影响

目的 探讨鞘内重复注射驱动蛋白17（Kinesin superfamily 17,KIF17）反义寡核苷酸对骨癌痛小鼠脊髓水平mLin10（mammalian orthologue of the caenorhabditis elegans LIN-10,mLin10）和NR2B（the 2Bsubunits of N-methyl-D-aspartate Receptor,NR2B）蛋白表达的影响.方法 56只雄性C3H/HeJ小鼠,4～6周龄,体质量20～25 g,随机数字表法分为假手术组（S组,n=20）和骨癌痛组（T组,n=36）.T组小鼠右侧股骨骨髓腔内注射约含2×105个NCTC2472纤维肉瘤细胞的最小必须培养基（α-MEM）20μl制备骨癌痛模型,S组小鼠注射不含肿瘤细胞的α-MEM 20μl.各组于接种前（base）、接种后第4,7,10,14天行痛行为学测试并在相应时间点取24只小鼠用western blot法测定脊髓KIF17、mLin10和NR2B蛋白含量.再将T组剩余24只小鼠随机分为T1,T2,T3组,每组8只.接种后第14天起,连续6d同一时间行鞘内穿刺给药,S组和T1组注射5μl生理盐水,T2组和T3组分别注射KIF17正义、反义寡核苷酸5μg/5μl.连续给药,第2～6天行痛行为学测试,第6天再次测定脊髓相关蛋白含量.结果 接种后7～14d,与S组和基础值相比,T组小鼠自发抬足次数增多,机械缩足阈值降低（P＜0.05）,与基础值[（0.65±0.15）、（1.06±0.06）、（1.01±0.14）]相比,T组小鼠脊髓水平KIF17、mLin 10和NR2B蛋白表达[14 d：（1.13±0.06）、（2.17±0.37）、（1.85±0.32）]增多（P＜0.05）;给药期间,与T1和T2组相比,T3组小鼠自发抬足次数减少,机械缩足阈值升高（P＜0.05）,给药后脊髓水平KIF17、mLin10和NR2B蛋白表达[（0.88±0.08）、（0.96±0.11）、（1.03±0.08）]减少（P＜0.05）.结论 重复鞘内注射KIF17反义寡核苷酸能明显改善骨癌痛小鼠的痛行为,并抑制了脊髓水平KIF17、mLin10和NR2B蛋白表达上调.

Effects of repeated intrathecally KIF17 antisense oligodeoxynucleotide on the expression of mLin10 and NR2B in spinal cord in a mouse model of bone cancer pain

Objective To investigate the effects of repeated intrathecally kinesin superfamily protein 17 （KIF17） antisense oligodeoxynucleotide （ODN） on the expression of mLin10 and NR2B in spinal cord in a mouse model of bone cancer pain.Methods Fifty-six male C3H/HeJ mice,aged 4 ～ 6 weeks,weighting 20 ～ 25 g,were randomly divided into two groups：sham operation group （group S,n=20） and bone cancer pain group （group T,n=36）.20μl α-minimal essence medium （α-MEM） which containing 2× 105 NCTC2472 osteosarcoma cells was injected into the intramedullary space of the right femur in group T.In group S,no cancer cell was instead.The number of spontaneous flinches （NSF） and the paw withdrawal mechanical threshold （PWMT） were measured at the day before （base） and the days 4,7,10 and 14 after inoculation.According to the corresponding time points,twenty-four mice were sacrificed for determination the expression of KIF17,mLin10 and NR2B using Western blot.Then,the mice of group T were randomly divided into three groups （n=8,T1,T2,T3,group）.In group S and group T1,Saline 5 μl was injected intrathecally.KIF17 sense ODN and antisense ODN,5 μg/5μl were respectively injected in group T2 and T3 for 6 consecutive days.Pain behaviors were assessed at the days 2-6 after the first injection.And determinated the KIF17,mLin10 and NR2B expression,again.Results Compared with group S,the NSF was increased and the PWMT was decreased at the days 7,10 and 14 after inoculation in group T （P＜0.05）.Compared with the base （（0.65±0.15）,（1.06±0.06）,（1.01±0.14））,the expression of KIF17,mLin10 and NR2B （14d：（1.13 ±0.06）,（2.17 ± 0.37）,（1.85 ± 0.32）） were increased at the days 7,10 and 14 after inoculation in group T（P＜0.05）.During the course of the injection,compared with group T1 and T2,the NSF was decreased and the PWMT was increased significantly in the group T3（P＜0.05）,the expression of KIF17,mLin10 and NR2B（（0.88±0.08）,（0.96±0.11）,（1.03±