国际麻醉学与复苏杂志   2013, Issue (4): 7-7
    
水溶性脂聚体可运载N-甲基-D-天冬氨酸受体 2B小干涉RNA治疗慢性炎性疼痛
杨雪, 董文芳, 彭捷, 熊家祥, 陆建华1()
1.南方医科大学附属广州军区广州总医院研究生培养基地
Water soluble lipopolymer can be efficient small interfering RNA delivery targeting N-Methyl-D-aspartic acid receptor 2B in rats with chronic inflammatory pain
 全文:
摘要:

目的 慢性炎性疼痛的基因治疗缺乏安全且高效的载体,本实验探讨了低分子量聚乙烯亚胺(polyethylenimine, PEI)和胆固醇组成的水溶性脂聚体(water-soluble lipopolymer, WSLP)运载N-甲基-D-天冬氨酸受体2B亚基(N-Methyl-D-aspartic acid receptor 2B, NR2B)小干涉RNA(small interfering RNA, siRNA)治疗大鼠慢性炎性疼痛的可行性。 方法 将WSLP直接与靶向NR2B的siRNA连接形成WSLP/siRNA复合物,乱序siRNA作为对照(WSLP/scRNA);然后检测鞘内注射WSLP/siRNA对完全弗氏佐剂(freund's adjuvant complete, CFA) 炎性痛模型大鼠脊髓背角(spinal cord doral horn, SCDH)NR2B蛋白表达的影响,并且测定鞘内注射此复合物后炎性痛大鼠机械缩足反射阈值(mechanical withdrawal threshold, MWT)及热缩足反射持续时间(thermal withdrawal duration, TWD)的变化。 结果 WSLP/siRNA注射后3 d,炎性疼痛大鼠SCDH NR2B蛋白水平的表达与CFA组比较显著下降58%(P<0.01),WSLP/scRNA 及PEI/siRNA注射后NR2B的表达无明显变化(P>0.05)。WSLP/siRNA鞘内注射后3、4 d及5 d炎性痛大鼠的MWT[(3 d:(9.2±1.3);4 d:(9.8±1.2);5 d:(9.5±1.2)]较CFA组[(3 d:(4.6±1.2);4 d:(4.9±1.8);5 d:(5.0±1.8)]显著增高(P<0.01),TWD[(3 d:(3.27±0.32) s;4 d:(3.83±0.49) s;5 d:(3.57±0.33) s]较CFA组[(3 d:(6.71±0.45) s;4 d:(6.97±0.54) s;5 d:(6.63±0.38) s]显著缩短(P<0.01),WSLP/scRNA 及PEI/siRNA均无此治疗作用(P>0.05)。 结论 WSLP可有效运载siRNA抑制CFA所致慢性炎性痛大鼠NR2B的过度表达,从而对炎性疼痛大鼠具有治疗作用。

关键词: 水溶性脂聚体; N-甲基-D-天冬氨酸受体受体2B; 小干涉RNA; 炎性疼痛
Abstract:

Objective To examine the potential application of a non-viral gene carrier, water soluble lipopolymer (WSLP) for delivering siRNA targeting NMDA receptor 2B (NR2B) in vivo and to determin whether WSLP/siRNA complexes can be a new method for chronic inflammatory pain treatment. Methods WSLP was complexed with siRNA (designed to inhibit NR2B expression) or scrambled siRNA(as a control). Changes of NR2B expression were detected using western-blot in SCDH of chronic inflammatory pain rats following intrathecal injection of WSLP/siRNA. Pain control efficacy was evaluated by changes of mechanical withdrawal threshold (MWT) and thermal withdrawal duration (TWD) in these rats. Results NR2B protein expression was efficiently inhibited by intrathecal injection of WSLP/siRNA complexes, and the changes of protein level was reduce by 58% compared to chronic inflammatory pain rats without treatment(P<0.01),while complexes injection of WSLP with scrambled siRNA or PEI with siRNA did not show this inhibitory effect(P>0.05). Moreover, injection of WSLP/siRNA complexes significantly reduced MWT [(3 d:(9.2±1.3),4 d:(9.8±1.2),5 d:(9.5±1.2)] and increased TWD[(3 d:(3.27±0.32) s,4 d:(3.83±0.49) s,5 d:(3.57±0.33) s] of chronic inflammatory pain rats accordingly compared to chronic inflammatory pain rats without treatment [(MWT: 3 d:(4.6±1.2); 4 d: (4.9±1.8), 5 d:(5.0±1.8); TWD: 3 d:(6.71±0.45) s, 4 d:(6.97±0.54) s,5 d:(6.63±0.38) s](P<0.01). Conclusions These results demonstrate that WSLP can efficiently deliver siRNA targeting NR2B in vivo and relieve chronic inflammatory pain.

Key words: Water soluble lipopolymer; N-Methyl-D-aspartic acid receptor 2B; Small interfering RNA; Chronic inflammatory pain