大鼠胫骨内接种Walker256乳腺癌肉瘤细胞建立骨癌痛模型

目的 评价大鼠胫骨内接种Walker 256乳腺癌肉瘤细胞建立骨癌痛模型的可行性.方法 雌性Wistar大鼠60只,体重180～200 g,随机分为4组(n=15):正常对照组(1组)、假手术组(Ⅱ组)、生理盐水+模型组(Ⅲ组)和氟比洛芬酯+模型组(Ⅳ组).麻醉后,Ⅱ组左侧胫骨骨髓腔内注入0.2ml生理盐水;Ⅲ组和Ⅳ组于左侧胫骨骨髓腔内接种10μl Walker 256乳腺癌肉瘤细胞(2×105个)建立大鼠骨癌痛模型,于接种后14、17 d时经尾静脉分别注射0.2 ml生理盐水或氟比洛芬酯10 mg/kg(0.2m1).于接种前、接种后4、7、10、14、17、21 d时测量体重后测定痛阈;于接种后1.4 d时行胫骨影像学检查;于接种后21 d时处死大鼠,取胫骨行病理学检查.结果 与Ⅰ组相比,Ⅲ组和Ⅳ组于接种后10 d体重开始逐渐下降,机械痛阈降低(P<0.05),影像学检查示骨质增生,骨皮质破坏,病理学检查见胫骨内有肿瘤生长;与Ⅲ组相比,Ⅳ组机械痛阈升高(P<0.05).各组间热痛阈比较差异无统计学意义(P>0.05).结论 大鼠胫骨内接种Walker256乳腺癌肉瘤细胞可成功地建立骨癌痛模型,其痛行为学特征主要表现为机械痛觉过敏.

Establishment of a rat model of bone cancer pain induced by intra-tibia inoculation of Walker 256 mammary gland carcinoma cells

Objective To establish a rat model of bone cancer pain by intra-tibia inoculation of Walker 256 mammary gland carcinoma cells. Methods Sixty female Wistar rots weighing 180-200 g were randomly divided into 4 groups (a=15each):groupⅠ normal control; group Ⅱsham operation; group Ⅲtumor cell inoculation + normal saline (NS) and group Ⅳtumor cell inoculation + flurbiprofen. NS 0.2 nd and flurbiprofen 10 mg/kg in 0.2 ml were injected IV at 2 h before determination of pain threshold on 14 and 17 d after inoculation oftumor cells in groupⅢand Ⅳ respectively. On day 0, 4, 7, 10, 14, 17 and 21 after inoculation pain threshold was measured after determination of body weight. X-ray examination of the tibia was performed on day 14 after inoculation. The animals were killed on day 21 after inoculation for microscopic examination of the inoculated tibia. Results The animals started losing weight and the threshold to yon Frey hair stimulation was decreased from dhy 10 after inoculation in group Ⅲand Ⅳ. X-ray examination showed destruction of bone and microscopic examination showed tumor growing in tibia. Flurbiprofen significantly decreased mechanical hyperalgesia in group Ⅳ. There was no significant difference in paw withdrawal latoney to radiant heat among the 4 groups. Conclusion A model of bone cancer pain can be made by inoculation of Walker 256 mammary gland carcinoma cells into tibia characterized by mechanical hyperalgesia.