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。     

Interleukin-10 promoter polymorphisms in rheumatoid arthritis and Felty's syndrome

OBJECTIVE: To examine whether promoter polymorphisms associated with variation in interleukin-10 (IL-10) production are relevant to the development of rheumatoid arthritis (RA) or Felty's syndrome (FS). METHODS: DNA was obtained from 44 FS patients, 117 RA patients and 295 controls. The promoter region between -533 and - 1120 was amplified by polymerase chain reaction, and polymorphisms detected by restriction enzyme digest or sequence-specific oligonucleotide probing. RESULTS: We found no significant difference in allele or haplotype frequencies between the groups. CONCLUSION: There is no association between FS or RA and these recently identified IL-10 promoter polymorphisms. Other genetic or environmental factors could explain the alterations in IL-10 levels seen in these conditions.      

Optimizing CT for the evaluation of vestibular aqueduct enlargement:Inter-rater reproducibility and predictive value of reformatted CT measurements

Enlarged vestibular aqueduct(EVA), the most frequent identifiable cause of congenital hearing loss, is evaluated with high-definition multidetector CT in the axial plane. Our purpose was to determine which reformatted CT measurements are most reproducible. Seven multiplanar reformatted images were created for each of the 64 temporal bones in patients with EVA. Intraclass correlation coefficients(ICC) were used to assess inter-observer variability, and both linear regression and ROC analyses were used to compare the measurements with severity of hearing loss, as assessed by pure tone audiometry. All seven measurements had excellent inter-observer variability, with average-measure ICC ranging from 0.92 to 0.98. There was no statistically significant correlation between the radiologic degree of aqueduct enlargement and severity of hearing loss using any of the seven measurements; ROC analyses revealed areas under the curves ranging from 0.57 to 0.73. Optimal accuracy was obtained with a threshold of 1.75 mm as measured at the aqueductal aperture in the P€oschl plane, with sensitivity of 0.75 and specificity of0.63. Although the radiologic measurement may not serve as a reliable tool for assessing severity of EVA, P€oschl plane reformatting has proven to be better than conventional axial acquisition plane for identifying patients with clinically significant hearing loss.     

Molecular determinants of susceptibility to oncolytic vesicular stomatitis virus in pancreatic adenocarcinoma

Background

M protein mutant vesicular stomatitis virus (M51R-VSV) has oncolytic properties against many cancers. However, some cancer cells are resistant to M51R-VSV. Herein, we evaluate the molecular determinants of vesicular stomatitis virus (VSV) resistance in pancreatic adenocarcinoma cells.

Methods

Cell viability and the effect of β-interferon (IFN) were analyzed using 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium assay. Gene expression was evaluated via microarray analysis. Cell infectability was measured by flow cytometry. Xenografts were established in athymic nude mice and treated with intratumoral M51R-VSV.

Results

Four of five pancreatic cancer cell lines were sensitive to M51R-VSV, whereas Panc 03.27 cells remained resistant (81 ± 3% viability 72 h after single-cycle infection). Comparing sensitive MiaPaCa2 cells with resistant Panc 03.27 cells, significant differences in gene expression were found relating to IFN signaling (P = 2 × 10⁻⁵), viral entry (P = 3 × 10⁻⁴), and endocytosis (P = 7 × 10⁻⁴). MiaPaCa2 cells permitted high levels of VSV infection, whereas Panc 03.27 cells were capable of resisting VSV cell entry even at high multiplicities of infection. Extrinsic β-IFN overcame apparent defects in IFN-mediated pathways in MiaPaCa2 cells conferring VSV resistance. In contrast, β-IFN decreased cell viability in Panc 3.27 cells, suggesting intact antiviral mechanisms. VSV-treated xenografts exhibited reduced tumor growth relative to controls in both MiaPaCa2 (1423 ± 345% versus 164 ± 136%; P < 0.001) and Panc 3.27 (979 ± 153% versus 50 ± 56%; P = 0.002) tumors. Significant lymphocytic infiltration was seen in M51R-VSV–treated Panc 03.27 xenografts.

Conclusions

Inhibition of VSV endocytosis and intact IFN-mediated defenses are responsible for M51R-VSV resistance in pancreatic adenocarcinoma cells. M51R-VSV treatment appears to induce antitumor cellular immunity in vivo, which may expand its clinical efficacy.