3D打印可拆卸垂体瘤切除模型的真实性评估

目的探究可拆卸经鼻垂体腺瘤切除操作模型的真实性,并初步探讨了模型的教学性。方法利用患者CT建模、精细优化及3D打印技术构建可拆卸垂体腺瘤切除模型。评估者为19名来自北京协和医院的本院及进修医师,其中年资<10分入"低年资组";年资≥10分入"高年资组"。每位医师分别对3D打印垂体腺瘤切除模型进行操作,并于操作前后分别填写调查问卷、评估量表。结果高年资组的探查经验均高于低年资组。真实度项目的得分均在4附近,各评分项间无明显差异;"切除垂体腺瘤"步骤的真实性评分相对较低;高年资组评分普遍低于低年资组。操作前低年资组信心评分显著低于高年资组,操作后两组评分趋于一致;低年资组的垂体腺瘤切除信心评分变化显著高于高年资组(P<0.05)。结论该模型具有较高的真实性,可用于教学试验进一步评估教学效果。     

TGF-β、PD-L1及PI3K蛋白在胃癌组织中的表达及临床意义北大核心

目的:检测胃癌组织中TGF-β、PD-L1及PI3K的表达情况,并探讨TGF-β、PD-L1及PI3K表达的临床意义。方法:收集2017年01月至2018年01月我院74例接受过胃癌根治术且组织学证实为胃腺癌患者的病例蜡块标本。采用免疫组织化学法检测其中TGF-β、PD-L1以及PI3K的表达情况,分析其与临床病理参数之间的关系及三者在胃癌组织中表达的相关性,并分析其与胃癌患者预后生存之间的关系。结果:胃癌组织中TGF-β、PD-L1、PI3K阳性率高于癌旁组织,差异具有统计学意义(P<0.05);胃癌组织中TGF-β的表达与淋巴结转移、临床TNM分期有关(P<0.05),与年龄、性别、分化程度、浸润程度、肿瘤直径无显著相关性(P>0.05);胃癌组织中PD-L1和PI3K的表达与肿瘤浸润程度、淋巴结转移、临床TNM分期有关(P<0.05),与年龄、性别、分化程度、肿瘤直径无显著相关性(P>0.05);在胃癌组织中,TGF-β与PD-L1的表达呈正相关(P<0.05),TGF-β与PI3K的表达呈正相关(P<0.05),PI3K与PD-L1的表达呈正相关(P<0.05)。Kaplan-Meier生存分析提示,与TGF-β、PD-L1、PI3K阴性相比,TGF-β、PD-L1、PI3K阳性表达的患者总生存期明显缩短(P<0.05)。结论:胃癌组织中存在TGF-β、PD-L1以及PI3K的高表达,并且TGF-β、PD-L1、PI3K的表达与淋巴结转移、临床TNM分期密切相关,三者可能参与胃癌的发生、发展和转移,且高表达患者的预后情况较差。     

Knockdown of DEAD-box 51 inhibits tumor growth of esophageal squamous cell carcinoma via the PI3K/AKT pathway

BACKGROUND Esophageal squamous cell carcinoma(ESCC)is one of the most prevalent malignancies that seriously threaten people’s health worldwide.DEAD-box helicase 51(DDX51)is a member of the DEAD-box(DDX)RNA helicase family,and drives or inhibits tumor progression in multiple cancer types.AIM To determine whether DDX51 affects the biological behavior of ESCC.METHODS The expression of DDX51 in ESCC tumor tissues and adjacent normal tissues was detected by Immunohistochemistry(IHC)analyses and quantitative PCR(qPCR).We knocked down DDX51 in ESCC cell lines by using a small interfering RNA(siRNA)transfection.The proliferation,apoptosis,and mobility of DDX51 siRNAtransfected cells were detected.The effect of DDX51 on the phosphoinositide 3-kinase(PI3K)/AKT pathway was investigated by western blot analysis.A mouse xenograft model was established to investigate the effects of DDX51 knockdown on ESCC tumor growth.RESULTS DDX51 exhibited high expression in ESCC tissues compared with normal tissues and represented a poor prognosis in patients with ESCC.Knockdown of DDX51 induced inhibition of ESCC cell proliferation and promoted apoptosis.Moreover,DDX51 siRNA-expressing cells also exhibited lower migration and invasion rates.Investigations into the underlying mechanisms suggested that DDX51 knock down induced inactivation of the PI3K/AKT pathway,including decreased phosphorylation levels of phosphate and tensin homolog,PI3K,AKT,and mammalian target of rapamycin.Rescue experiments demonstrated that the AKT activator insulin-like growth factor 1 could reverse the inhibitory effects of DDX51 on ESCC malignant development.Finally,we injected DDX51 siRNA-transfected TE-1 cells into an animal model,which resulted in slower tumor growth.CONCLUSION Our study suggests for the first time that DDX51 promotes cancer cell proliferation by regulating the PI3K/AKT pathway;thus,DDX51 might be a therapeutic target for ESCC.     

The biomechanical effects of 3D printed and traditionally made foot orthoses in individuals with unilateral plantar fasciopathy and flat feet

BackgroundFoot orthoses (FOs) are used to manage foot pathologies such as plantar fasciopathy. 3D printed custom-made FOs are increasingly being manufactured. Although these 3D-printed FOs look like traditionally heat-moulded FOs, there are few studies comparing FOs made using these two different manufacturing processes.Research questionHow effective are 3D-printed FOs (3D-Print) compared to traditionally-made (Traditional) or no FOs (Control), in changing biomechanical parameters of flat-footed individuals with unilateral plantar fasciopathy?MethodsThirteen participants with unilateral plantar fasciopathy walked with shoes under three conditions: Control, 3D-print, and Traditional. 2 × 3 repeated measures analysis of variance (ANOVAs) with Bonferroni post-hoc tests were used to compare discrete kinematic and kinetic variables between limbs and conditions. Waveform analyses were also conducted using statistical parametric mapping (SPM).ResultsThere was a significant condition main effect for arch height drop (p = 0.01; ηp² =0.54). There was 0.87 mm (95% CI [−1.84, −0.20]) less arch height drop in 3D-print compared to Traditional. The SPM analyses revealed condition main effects on ankle moment (p < 0.001) and ankle power (p < 0.001). There were significant differences between control condition and both 3D-print and Traditional conditions. For ankle moment and power, there were no differences between 3D-print and Traditional conditions.Significance3D-printed FOs are more effective in reducing arch height drop, whist both FOs lowered ankle plantarflexion moment and power compared to no FOs. The results support the use of 3D-printed FOs as being equally effective as traditionally-made FOs in changing lower limb biomechanics for a population of flat-footed individuals with unilateral plantar fasciopathy.     

健脾消癌方通过PI3K/Akt信号通路抑制结肠癌血管生成的研究＊

目的 观察结肠癌HCT116细胞健脾消癌方的条件培养液对HUVEC细胞管腔形成的影响，从PI3K/Akt生物轴调控角度探讨其作用机制。方法 培养HCT116细胞，细胞设3组：对照组，健脾消癌方组（加入15%健脾消癌方含药血清）及人参皂苷Rg3组；制备HCT116细胞健脾消癌方条件培养液（分组及制备方法见实验方法），用条件培养液干预HUVEC（脐静脉内皮细胞，Human Umbilical Vein Endothelial Cells），Matrigel基质胶法检测HCT116细胞健脾消癌方条件培养液对HUVEC小管形成的影响。随后采用蛋白免疫印迹法（Western blot）检测各组HCT116细胞磷脂酰肌醇3-激酶（PI3K）、蛋白激酶B（Akt）、p-Akt、VEGF（血管内皮生长因子，Vascular endothelial growth factor）蛋白表达。最后在结肠癌HCT116荷瘤小鼠中验证健脾消癌方对肿瘤生长速度的影响，并经瘤组织VEGF蛋白表达、CD31免疫组化染色检测肿瘤内血管生成情况。结果 模型组HUVEC细胞管腔形成较空白血清组显著增加（P<0.05）；健脾消癌方组及人参皂苷Rg3组较模型组HUVEC细胞管腔形成显著减少（P<0.01）。p-Akt和VEGF蛋白表达水平模型组高于空白血清组（P<0.05），健脾消癌方组及人参皂苷Rg3组显著低于模型组（P<0.01）；PI3K、Akt蛋白表达量组间差异无统计学意义。与对照组比较，模型组荷瘤小鼠肿瘤体积显著性增大，瘤组织内VEGF表达、CD31阳性面积显著性增加，差异有统计学意义（P<0.05）；与模型组比较，健脾消癌方组及人参皂苷Rg3组荷瘤小鼠肿瘤体积显著减小，瘤组织内VEGF表达、CD31阳性面积降低，差异有统计学意义（P<0.05）。结论 健脾消癌方可抑制肿瘤的血管生成和生长，其作用机制可能与PI3K/Akt生物轴调控VEGF表达有关。