Artificial disc and vertebra system: a novel motion preservation device for cervical spinal disease after vertebral corpectomy

OBJECTIVE:To determine the range of motion and stability of the human cadaveric cervical spine after the implantation of a novel artificial disc and vertebra system by comparing an intact group and a fusion group.METHODS:Biomechanical tests were conducted on 18 human cadaveric cervical specimens. The range of motion and the stability index range of motion were measured to study the function and stability of the artificial disc and vertebra system of the intact group compared with the fusion group.RESULTS:In all cases, the artificial disc and vertebra system maintained intervertebral motion and reestablished vertebral height at the operative level. After its implantation, there was no significant difference in the range of motion (ROM) of C3–7 in all directions in the non-fusion group compared with the intact group (p>0.05), but significant differences were detected in flexion, extension and axial rotation compared with the fusion group (p<0.05). The ROM of adjacent segments (C₃₋₄, C₆₋₇) of the non-fusion group decreased significantly in some directions compared with the fusion group (p<0.05). Significant differences in the C_4-6 ROM in some directions were detected between the non-fusion group and the intact group. In the fusion group, the C₄₋₆ ROM in all directions decreased significantly compared with the intact and non-fusion groups (p<0.01). The stability index ROM (SI-ROM) of some directions was negative in the non-fusion group, and a significant difference in SI-ROM was only found in the C₄₋₆ segment of the non-fusion group compared with the fusion group.CONCLUSION:An artificial disc and vertebra system could restore vertebral height and preserve the dynamic function of the surgical area and could theoretically reduce the risk of adjacent segment degeneration compared with the anterior fusion procedure. However, our results should be considered with caution because of the low power of the study. The use of a larger sample should be considered in future studies.     

山羊颈椎次全切除减压非融合后生物力学特性

目的 探讨山羊颈椎次全切除减压非融合后生物力学特性.方法 选取成年雄性山羊6只造模(模型组),术前行颈椎X线检查,排除骨性结构异常,并测量节段性Cobb角(SCA)和颈椎Cobb角(CCA)于C4行颈椎次全切除术,并植入可动人工颈椎(ACV).术后行颈椎正侧位X线检查,再次测量SCA和CCA.术后6个月处死山羊,并以6...     

蓝桉果实正丁醇部位化学成分

采用硅胶、制备型HPLC等柱色谱方法对蓝桉(Eucalyptus globulus)果实的化学成分进行分离纯化,通过NMR,MS等波谱技术鉴定了12个化合物,分别为:鞣花酸(1),3-O-甲基鞣花酸4′-O-α-L-吡喃鼠李糖苷(2),valoneic acid dilactone(3),8-β-C-葡萄糖基-5,7-二羟基-2-甲基色原酮(4),6-β-C-葡萄糖基-5,7-二羟基-2-甲基色原酮(5),8-β-C-glucopyranosyl-5,7-dihydroxy-2-isobutylchromone(6),8-β-C-glucopyranosyl-5,7-dihydroxy-2-isopropylchromone(7),quercetin 3-O-β-D-glucopyranoside(8),quercetin 3-O-β-D-glucuronide-6″-methylester(9),(+)-lyoniresin-4-yl-β-D-glucopyranoside(10),cypellocarpins A(11),eucaglobulin 1(12)。化合物 3~10 为首次从该植物中分离得到。     

中西医结合治疗绿脓杆菌感染创面40例疗效观察

目的 探讨中西医结合治疗绿脓杆菌感染创面的治疗作用。方法 应用丽珠肠乐胶囊及麝香制剂治疗40例绿农杆菌感染创面。结果 本文通过自体对照，显示应用中西药结合的方法治疗绿脓杆菌感染创面迅速、有效。结论 口服丽珠肠乐胶囊，外用麝香制剂可作为治疗绿脓杆菌感染创面的最佳用药。     

Rapamycin inhibiting Jurkat T cells viability through changing mRNA expression of serine/threonine protein phosphatase 2A

Aims

In this study, we analyzed the mRNA expression of serine/threonine (Ser/Thr) protein phosphatase 2A (PP2A) in the human leukemic T-cell line Jurkat cells treated with rapamycin, to determine whether rapamycin inhibiting cell viability is accompanied with the change of mRNA expression of PP2A.

Methods and results

Jurkat cells were incubated with various concentrations of rapamycin and cultured for different hours. Cell viability was assessed by MTT assay. The mRNA expressions of PP2A subunits were measured by quantitative real-time polymerase chain reaction (PCR). We found that rapamycin had an inhibitory effect on cell viability. IC50 was 343.3 nM at 48 h.We also found rapamycin had a dose and time-dependent effect on the gene expression of PP2A. When setting the concentration of rapamycin 500 nM, the mRNA expressions of PP2A subunits (Aa, Aβ, PR55a, PR55δ, PR61γ, PR70, Ca and Cβ) were declined significantly at 48 h. When treated with various concentrations of rapamycin for 48 h, the mRNA expressions of PP2A subunits were down-regulated in the range from 10 nM to500 nM.

Conclusions

Rapamycin inhibiting Jurkat T cells viability may be related to the reduction of PP2A mRNA expressions.     

Relationship of low-density lipoprotein and nephrolithiasis in different genders

Objective To investigate the relationship between dyslipidemia and nephrolithiasis in a population-based study. Methods All participants were investigated by questionnaires, physical examinations and laboratory tests including liver and renal function, lipid profile, serum fasting glucose, glycosylated hemoglobin. Nephrolithiasis was diagnosed by kidney B-ultrasonography. Subjects with estimated glomerular filtration rate (eGFR)＜60 ml?min-1?(1.73 m2)-1 were excluded. Results 10 316 individuals were enrolled with an average age of (54.88±10.27) years (range 17-88 years) and the ratio of male to female 1∶1.12. The prevalence of nephrolithiasis was 5.6%, 3.7% and 7.8% for whole population, women and men, respectively. In women, only eGFR in stone group was significantly lower than that in non-stone group (P＜0.05). However, participants in stone group were significantly older (P＜0.05), of higher blood pressure (P＜0.01), higher serum uric acid (P＜0.01), worse renal function (serum creatinine, P＜0.05; eGFR, P＜0.01), and higher low-density lipoprotein (LDL) (P＜0.05), compared with those in non-stone group in men. Logistic regression analysis showed that only eGFR (P＜0.05) was the independent influential factor for kidney stones in women; In men, LDL was an independent influential factor for nephrolithiasis with a hazard ratio of 1.149 (95%CI 1.003-1.317, P＜0.05), except for mean blood pressure and eGFR. After being divided into normal group, borderline high group and high LDL group according to the LDL level, with the increase of LDL, the prevalence of nephrolithiasis was significantly increased by 7.3%, 8.3% and 10.6% in men respectively. There was no significant relationship between total cholesterol, triglyceride, high-density lipoprotein and nephrolithiasis. Conclusions Dyslipidemia is associated with nephrolithiasis in men, and high LDL cholesterol is an independent risk factor for nephrolithiasis. Clinical lipid testing not only helps to reduce the risk of atherosclerotic disease, but also reduces the risk of kidney stones.     

海德堡三角清扫在胰腺癌根治术中的应用价值

目的:探讨海德堡三角清扫在胰腺癌根治术中的应用价值。方法:采用回顾性描述性研究方法。收集2020年3―7月南京医科大学第一附属医院收治的30例行海德堡三角清扫胰腺癌病人的临床病理资料;男12例,女18例;中位年龄为65岁,年龄范围为41~79岁。病人完成肿瘤可切除性评估和肝十二指肠韧带廓清后,显露肠系膜上动脉、腹腔干、...     

The RNA m6A methyltransferase METTL3 promotes pancreatic cancer cell proliferation and invasion

Epigenetic modifications are involved in carcinogenesis and METTL3 is involved in RNA methylation. This study aimed to explore the role of the RNA m6A methyltransferase METTL3 in pancreatic cancer cells. The m6A modification was analyzed in human pancreatic cancer and paracancerous specimens, as well as in the normal HPDE6-C7 pancreatic cell line and the MIA-PaCa-2 and BxPC-3 pancreatic cancer cell lines. Immunohistochemistry (IHC), western blotting, and RT-qPCR were used to detect the expression of METTL3. Cell lines were transfected with siRNAs against METLL3. Proliferation, invasion, and migration were examined. The functions of METTL3 were predicted by bioinformatics analysis. In the 40 patients included, high METTL3 expression was associated with high pathological stage (P = 0.02) and high N stage (P = 0.02). Survival was better in patients with low METTL3 expression compared with those with high MTTL3 expression (P < 0.01). METTL3 and CIITA expression levels were inversely correlated (r = ?0.71, P < 0.01). RNA m6A content in tumor specimens was significantly higher than that in paracancerous specimens. METTL3 protein and mRNA levels were significantly higher in tumor specimens compared with paracancerous specimens, as well as in cancerous cell lines vs. normal cells. METTL3 knockdown in MIA PaCa-2 and BxPC-3 cells decreased RNA m6A modifications. Cell proliferation, invasion, and migration were decreased by METTL3 knockdown in cancerous cell lines. A total of 673 differentially expressed genes were identified by bioinformatics: 659 were upregulated and 14 were downregulated. In conclusion, METTL3 is probably involved in pancreatic carcinogenesis. It could eventually be a prognostic marker or a treatment target.     

胰腺癌的手术切缘定义和标准

外科手术是胰腺癌病人获得长期生存的关键因素,切缘评估是重要的手术质量评价标准和预后影响因素。并非所有外科医师对胰腺癌手术切缘定义和标准都有清晰认识。环周切缘概念的引入和“1 mm”原则的应用,可以帮助临床医师更加准确地判断病人预后。随着对胰腺癌认识的进一步深入,更严谨、精准的胰腺癌手术切缘评估体系将更好地指导临床实践,使病人得到更好的生存获益。笔者综合国内外研究进展,探讨胰腺癌的手术切缘定义和标准。