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.     

应用模拟低剂量法行新生儿头颅CT扫描

Objective To determine the effects of dose reduction on multi-slice spiral CT(MSCT) of neonatal head and assess the lowest possible radiation for acceptable clinical images.Methods Fifty-seven newborns suspected intracranial hemorrhage were entered into the study and underwent MSCT scans.Original images at three anatomic levels (posterior fossa, basal ganglia, centrum semiovale) were collected and synthetic noise was added so as to simulate dose reductions of 25%, 40%, 50% and 70%, respectively by using the noise addition tool.A total of 855 image data sets were obtained for the 57 patients.Original and simulated dose-reduction scan images were analyzed.Image noise and image quality were assessed by two independent experienced pediatric radiologists using diagnostic acceptability score, subjective image noise score on a 5-peint scale and objective noise index.Image noise was measured by respectively placing region of interest (ROI) at cerebellum, thalamus and corona radiata of 3 different slices.And the noise index and mean value was calculated.The degree of inter-observer concordance was determined by Kappa statistical analysis.The Spearman statistical correlations between the noise index and diagnostic acceptability score were performed.Results On the images of original dose and simulated dose reductions of 25%, 40%, 50% and 70%, the diagnostic acceptability was 4.47±0.51, 3.96±0.33, 3.21±0.45, 2.92±0.32, and 1.85±0.57, respectively,the subjective image scores were 1.62±0.48, 1.99±0.48, 2.76±0.81, 3.19±0.67, and 4.27±0.54, respectively, the noise index were 1.90±0.19, 2.17±0.20.2.44± 0.25, 2.68±0.28, and 3.37±0.39, respectively.The two radiologists had good intembserver agreement for diagnostic acceptability (K=0.860, P=0.017) and for image noise scoff ng (K=0.630, P=0.022).There was significant statistical correlation between image noise index and diagnostic acceptability (r= 0.826,P=0.001).At 40% dose reduction to the standard protocol, the noise index was 2.44 and the image quality score was 3.21 which were considered clinically acceptable.Conclusion The study revealed that acceptable imagos could be obtained with mean noise index of 2.44 and 40% dose reduction.     

L-T4对良性甲状腺结节的抑制性治疗

良性甲状腺结节是临床常见的内分泌疾病,临床上对甲状腺良性结节的主要治疗方法是左旋甲状腺素（L-T4）抑制性治疗,但目前对于L-T4抑制性治疗还存在着很多争议,如L-T4抑制性治疗的疗效,L-T4的应用指征和促甲状腺激素的抑制程度与L-T4治疗效果等.近年来的临床研究结果显示,L-T4抑制性治疗能显著抑制良性甲状腺结节的生长,将促甲状腺激素水平维持在0.1～0.3 IU/L疗程维持在12个月左右即能达到理想的治疗效果,且长期应用可能对心血管和骨骼系统产生影响.     

应用模拟低剂量法行新生儿头颅CT扫描

Objective To determine the effects of dose reduction on multi-slice spiral CT(MSCT) of neonatal head and assess the lowest possible radiation for acceptable clinical images.Methods Fifty-seven newborns suspected intracranial hemorrhage were entered into the study and underwent MSCT scans.Original images at three anatomic levels (posterior fossa, basal ganglia, centrum semiovale) were collected and synthetic noise was added so as to simulate dose reductions of 25%, 40%, 50% and 70%, respectively by using the noise addition tool.A total of 855 image data sets were obtained for the 57 patients.Original and simulated dose-reduction scan images were analyzed.Image noise and image quality were assessed by two independent experienced pediatric radiologists using diagnostic acceptability score, subjective image noise score on a 5-peint scale and objective noise index.Image noise was measured by respectively placing region of interest (ROI) at cerebellum, thalamus and corona radiata of 3 different slices.And the noise index and mean value was calculated.The degree of inter-observer concordance was determined by Kappa statistical analysis.The Spearman statistical correlations between the noise index and diagnostic acceptability score were performed.Results On the images of original dose and simulated dose reductions of 25%, 40%, 50% and 70%, the diagnostic acceptability was 4.47±0.51, 3.96±0.33, 3.21±0.45, 2.92±0.32, and 1.85±0.57, respectively,the subjective image scores were 1.62±0.48, 1.99±0.48, 2.76±0.81, 3.19±0.67, and 4.27±0.54, respectively, the noise index were 1.90±0.19, 2.17±0.20.2.44± 0.25, 2.68±0.28, and 3.37±0.39, respectively.The two radiologists had good intembserver agreement for diagnostic acceptability (K=0.860, P=0.017) and for image noise scoff ng (K=0.630, P=0.022).There was significant statistical correlation between image noise index and diagnostic acceptability (r= 0.826,P=0.001).At 40% dose reduction to the standard protocol, the noise index was 2.44 and the image quality score was 3.21 which were considered clinically acceptable.Conclusion The study revealed that acceptable imagos could be obtained with mean noise index of 2.44 and 40% dose reduction.     

分娩期母儿体液免疫机能的初步观察

孕妇机体的免疫反应受到抑制,是妊娠的一个生理过程,随受精卵的发育与胎儿的成长,体内激素及酶产生了相应的变化,特别是胎儿,胎盘单位产生的绒毛膜促性腺激素、胎盘生乳素与大量雌激素、孕激素和肾上腺皮质激素等都具有体液免疫及细胞免疫的抑制作用,因此妊娠期免疫耐受性增加,机体不把胎儿组织抗原当作异物排斥(5)。     

影像学新技术在神经胶质瘤诊断中的应用

神经胶质瘤是神经系统原发肿瘤中最常见的类型,占神经系统原发肿瘤的50%以上。美国癌症协会2001年统计约占全年所有新发肿瘤的1.4%和肿瘤死亡人数的2.4%[1]。治疗上应采用综合疗法,疗效很难令人满意,是一种常见的危害人类健康的疾病,是目前神经外科的难题和医学研究的重要课题之一。磁共振功能成像(functionalmagnetic resonance im-aging,fMR I)将组织的血流、代谢等功能信息结合到以形态结构成像为主的诊断过程之中,将会大大提高肿瘤诊断的能力。1磁共振灌注成像(perfusion weighted imaging,PW I)PW I能在活体上反映组织血管化程度和…     

脐带块穴位注射治疗小儿喘息性支气管炎的疗效及其机理的探讨

喘息性支气管炎为小儿的常见病。尤以学令期儿童多见,严重地威协着小儿的身心健康,至今国内外尚无特异的根治疗法。我科从70年采用脐带块穴位注射治疗,收到较好疗效,但对其作用机理尚缺乏认识。因此,我们于79年末到82年初对60余名反复持续发作的慢性迁延性患儿进行了免疫学功能检测,试作免疫机理上的探讨,现将资料完整的44例总结如下。     

鞘内注射miR-212反义锁核酸对骨癌小鼠痛行为的影响

目的研究骨癌痛发展和维持过程中小鼠脊髓水平miR-212表达的变化规律及连续鞘内注射miR-212反义锁核酸LNA．anti—miR-212对骨癌痛小鼠痛行为的影响。方法本实验分为两个部分：（一）骨癌痛小鼠脊髓水平miR-212表达的变化规律：C3H／HeJ雄性小鼠36只,随机分为假手术组（sham组,n=18）和肿瘤组（T组,n=18）。sham组小鼠在右侧股骨远端骨髓腔注射不含肿瘤细胞的仪一MEM,T组小鼠在右侧股骨远端骨髓腔注射纤维肉瘤细胞NCTC2472,建立骨癌痛模型。在术前1d,术后4d、7d、10d、14d、21d,sham组和T组各随机取三只小鼠处死,取脊髓腰膨大标本,用Real-timePCR的方法检测脊髓水平miR一212的表达情况。（二）连续鞘内注射LNA—anti-miR-212对骨癌痛小鼠痛行为的影响：C3H／HeJ雄性小鼠24只,随机分为四组：L组（鞘内注射LNA-anti—miR一212,n=6）、L’组（鞘内注射LNA＇-negativecontrol,n=6）、C组（鞘内注射溶媒无核酸酶水,n=6）和S组（假手术处理,n=6）。L组、L’组和C组小鼠在右侧股骨远端注射纤维肉瘤细胞NCTC2472,S组小鼠在右侧股骨远端骨髓腔注射不含肿瘤细胞的仪一MEM。所有小鼠于术前1d、术后4d、7d、10d、14d测小鼠痛行为指标,包括自发抬足次数和机械缩足阈值（PWMT）,术后14d,L组、L’组、C组小鼠分别鞘内注射LNA—anti—miR-21212pmol／5山、LNA＇-negativecontrol12pmol／5I＊1和无核酸酶水5I＊1,连续鞘内注射7d,1次／d,每天测小鼠痛行为指标,至术后第21天。结果miR-212的表达变化表现为：与基础值相比,sham组和T组小鼠在术后第4天,脊髓水平miR一212明显升高（P〈0．05）;与基础值和sham组相比,T组小鼠脊髓水平miR-212在术后7d、10d、14d、21d均明显升高（P〈0．05）。连续鞘内注射LNA—anti—miR-212改善骨癌痛小鼠痛行为：术后19d至21d,与L’组和c组相比,L组小鼠PWMT[19d（1．07-4-0．16）g,20d（1．13±0．21）g,21d（1．27±0．21）g）]明显升高（P〈0．05）,自发抬足次数明显降低[19d（6．674-1．04）,20d（6．62±1．39）,21d（6．47±1．17）]（P〈0．05）。与14d给药前相比,L组小鼠术后19d至21d的PWMT明显升高（P〈0．05）,自发抬足次数明显降低（P〈0．05）。结论骨癌痛发展过程中,脊髓水平miR-212表达量升高。连续鞘内注射LNA-anti—miR一212可以缓解骨癌小鼠痛行为。     

银丹心脑通软胶囊对大脑中动脉闭塞模型大鼠神经功能恢复及VEGF、GFAP表达的影响

脑血管意外是造成我国城乡居民死亡的主要原因,其中缺血性卒中约占脑血管病75％以上,随着人群中高血压、血脂异常、糖尿病等疾病患病率的不断上升及人口老龄化,     

儿童过敏性哮喘患者外周血白细胞介素17的变化

目的 研究儿童过敏性哮喘患者外周血白细胞介素(IL) 17 mRNA和蛋白水平的变化.方法 广州中医药大学第一附属医院收治的30例过敏性哮喘发作期患儿,25例哮喘缓解期患儿和30例健康儿童,采用实时荧光定量PCR相对定量法检测儿童的外周血IL-17 mRNA水平的变化,采用ELISA法检测各组血浆中IL-17蛋白水平的变化.结果 哮喘发作期患儿IL-17 mRNA表达显著升高,明显高于缓解期患儿和健康儿童[(10.20±3.32)％比(8.61±1.62)％和(3.84±1.36)％,均P＜0.05];哮喘发作期患儿IL-17蛋白表达明显高于缓解期患儿和健康儿童(P＜0.05).结论 过敏性哮喘发作期患儿外周血出现IL-17表达明显上升,提示IL-17在过敏性哮喘发病过程中起着重要作用.