复方沙棘颗粒对大鼠皮层神经细胞缺血性损伤的保护作用

目的 :研究复方沙棘颗粒对体外培养的大鼠大脑皮层神经细胞谷氨酸 (Glu)损伤的保护作用及机理。方法 :分离培养新生 (1d)大鼠大脑皮层神经细胞 ,加入Glu模拟兴奋性损伤 ,MTT法测定细胞存活率 ,比色法测定上清中乳酸脱氢酶 (LDH)含量 ,细胞中超氧化物歧化酶 (SOD)、谷胱甘肽 (GSH Px)活性、丙二醛 (MDA)含量。结果 :细胞经Glu损伤后 ,上清LDH含量、细胞中MDA含量显著增加 ,SOD和GSH Px活力明显下降。复方沙棘处理组可有效防止上述改变。结论 :复方沙棘颗粒可有效保护由Glu引起的大鼠大脑皮层神经细胞的损伤。其机理可能与抗脂质过氧化、清除自由基有关     

Wnt3a信号通路通过JMJD6的表观遗传修饰参与神经病理性疼痛

目的：探讨Wnt3a通过Jumonji C结构域6( Jumonji C domain 6,JMJD6)的表观遗传修饰在神经病理性疼痛 中发挥作用的机制。方法：将SD大鼠分为4组：Sham组,慢性缩窄性损伤(chronic constriction injury,CCI)组,CCI+阴性慢病毒表达载体(LV-NC)组;CCI+慢病毒过表达载体(LV-JMJD6)组。构建SD大鼠坐骨神经CCI模型和JMJD6慢病毒 表达载体。CCI术后第3天通过鞘内导管给药,按照分组分别给予生理盐水和含慢病毒的试剂(病毒滴度1×108 TU/mL) 各20 μL。监测大鼠的机械缩足阈值(paw withdrawal mechanical threshold,PWMT)和热缩足潜伏期(paw withdrawal thermal latency,PWTL),并运用蛋白质印迹法检测脊髓水平Wnt3a及NR2B蛋白的表达变化,免疫共沉淀检测JMJD6与Wnt3a之间是否存在直接相互作用。结果：与Sham组相比,CCI术后各组大鼠的PWMT明显降低和PWTL明显缩短(P<0.05)。与CCI组和CCI+LV-NC组相比,CCI+LV-JMJD6组的PWMT在术后第10和14天明显升高,PWTL在术后第14 天明显延长(P<0.05)。CCI术后第14天,CCI组及CCI+LV-NC组Wnt3a和NR2B蛋白表达水平较Sham组明显升高,鞘内注 射慢病毒载体后, CCI+LV-JMJD6组的Wnt3a和NR2B蛋白表达水平较CCI+LV-NC组降低(P<0.05)。免疫共沉淀结果显示Wnt3a与JMJD6之间无直接相互作用。结论：Wnt3a参与调节神经病理性疼痛,其作用可能与JMJD6的表观遗传修饰相关,两者可能通过间接相互作用进行调节。     

基于化学成分与肠道菌群探讨消癌解毒方中黄连-乌梅药对的配伍机制

目的 探讨黄连-乌梅药对与消癌解毒方水煎液中部分生物碱类成分的含量差异,并比较药对与全方对小鼠肠道菌群的影响。方法 采用Extend-C₁₈(100 mm×2.1 mm,1.8 μm)色谱柱,以0.1%甲酸水（A）-乙腈（B）进行梯度洗脱,流速0.3 mL/min,柱温35 ℃,进样量2 μL;离子化模式为电喷雾离子化（ESI）,以正离子模式检测,开展方法学验证和含量测定研究。按照给药不同将小鼠分为正常组、全方高浓度组、全方低浓度组、药对高浓度组和药对低浓度组,连续灌胃给药7 d,每组分别收集粪便样本,进行16S rRNA基因测序。结果 建立的含量测定方法在一定浓度范围内线性关系良好,方法学验证结果均符合相关要求,木兰花碱与非洲防己碱在黄连、药对以及全方中的含量分别为:(4.433±0.133)(8.905±0.154) mg/g,（3.545±0.033）（9.170±0.051） mg/g,（5.287±0.038）（13.861±0.690） mg/g。全方组和药对组中拟杆菌门Bacteroides的丰度均高于正常组,而全方组和药对组中厚壁菌门Firmicutes的丰度均低于正常组。药对高浓度组中的疣微菌门Verrucomicrobia和变形菌门Proteobacteria的丰度高于其他组。结论 液质联用方法和相关参数简便、可靠,可用于有关成分的含量检测。与单味药中含量相比,经过药对配伍后,非洲防己碱含量增加,而木兰花碱含量则略有降低;经过全方配伍后,2种成分的含量均增加。此外,肠道菌群实验表明无论是药对还是全方在给药后,会不同程度地影响肠道菌群内部占比改变,其可能对调节肠道系统平衡,具有一定帮助作用,从而为进一步阐释黄连-乌梅在消癌解毒方中配伍机制提供了参考和依据。      

Individual and joint effects of borderline ankle-brachial index and high plasma total homocysteine on all-cause death in hypertensive adults

BACKGROUNDThe cardiovascular hazards of total homocysteine (tHcy) are long known. In addition, despite the acknowledgment on the importance of low ankle-brachial index (ABI) (< 0.9), borderline ABI (0.91-0.99) was once commonly overlooked. This study aims to explore the independent and joint effect of tHcy level and borderline ABI on all-cause death in hypertensive population.METHODSThis study included 10,538 participants from China H-type Hypertension Registry Study. ABI was described into two groups: normal ABI (1.00-1.40) and borderline ABI. tHcy level was also divided into two groups: < 15.02 and ≥ 15.02 μmo/L. Four groups were analyzed, using COX proportional hazard regression model, separately and pairwise to observe the independent and joint effect on all-cause death.RESULTSA total of 126 (1.2%) deaths were observed in the 1.7 years follow-up time. Borderline ABI has a higher predicted risk of death than normal ABI (HR = 1.87, 95%CI: 1.17-3.00) after adjusting for potential covariates. Compare with tHcy level < 15.02 μmo/L (low tHcy), those with tHcy ≥ 15.02 μmo/L (high tHcy) had higher risk to event outcome (HR = 1.99, 95% CI: 1.30-3.05). According to the cumulative hazard curve, group with borderline ABI and high tHcy level has significantly higher altitude and larger increasing rate over follow-up period compare to other groups. Among those with borderline ABI, participants with high tHcy had higher death risk than those with low tHcy, nevertheless, no significant different between borderline and normal ABI among those with low tHcy levels.CONCLUSIONSBorderline ABI and tHcy level both have independent predictive value on all-cause death. The combined group of borderline ABI and high tHcy has highest risk factor of outcomes, which suggested the mutual additive value of borderline ABI and tHcy. More attention should be given to the importance of borderline ABI in hypertensive population, especially with elevated tHcy level.

Homocysteine (Hcy) is a sulfur-containing, non-proteinogenic amino acid synthesized through the transmethylation of amino acid methionine from one-carbon metabolism. Elevated plasma total homocysteine (tHcy) level is associated with endothelial dysfunction, increased blood coagulation, and metabolic disturbance, promoting cardiovascular diseases, stroke, and coronary artery disease.^[1,2] Notably, patients with high Hcy levels and concomitant hypertension were suggested to be at particularly higher risk.^[3] Moreover, increasing studies have explored a positive association between advanced Hcy level with all-cause mortality. According to a recent dose-response meta-analysis, for each 5-μmol/L increment of tHcy levels, the risk for all-cause mortality increased by 33.6%.^[4]The ankle-brachial index (ABI) is an effective, well-established measure that is commonly used in the diagnosis of peripheral artery disease (PAD),^[5] meanwhile was well studied as an important indicator of atherosclerosis and CVD events.^[6] Although ankle-brachial index (ABI) ≤ 0.90 has been recognized as the threshold value for abnormal/low ABI, which was proven to increase the risk of all-cause mortality,^[7] a study from the American Heart Association has suggested ABI between 0.91 and 1.00 should be considered as “borderline area” in terms of cardiovascular risks,^[8] considering of prior probability and sensitivity of ABI calculation. Emerging studies have aimed to explore the predictive value of borderline ABI,^[9-11] however, controversy remains because of limited and inconsistent data. The current study aimed to explore the individual and joint effect of borderline ABI and tHcy on all-cause mortality among hypertensive adults. Although ABI level ≤ 0.90 has been and is going to remain significant in clinical practice, we believe broader concern should be placed on borderline ABI, especially for its value in risk differentiation and identification. To the best of our knowledge, there are no similar previous studies.     

SETD5介导AKT1磷酸化调控结肠癌细胞的迁移和5-FU敏感性

目的：探讨含SET结构域蛋白5（SETD5）对结肠癌细胞增殖、迁移和对5-氟尿嘧啶（5-FU）药物敏感性的影响及机制。方法：常规培养结肠癌细胞,用Lipofectamine 2000将siSETD5-NC、si-SETD5-1~3质粒转染至HT-29细胞中,将其分为对照组（未处理）、si-SETD5-NC组、si-SETD5组和si-SETD5+SC79组,si-SETD5+SC79组HT-29细胞转染质粒的同时用10 μmol/L SC79处理。qPCR法检测NCM460、HT-29和LoVo细胞中SETD5 mRNA表达,流式细胞术、细胞划痕法、WB法和CCK-8法分别检测各组HT-29细胞的凋亡情况、迁移能力、相关蛋白的表达,以及对5-FU 的敏感性。结果：SETD5 mRNA在HT-29、LoVo细胞中均呈高表达（均P<0.01）。在HT-29细胞中成功地敲减了SETD5 mRNA（P<0.01）。敲减SETD5 mRNA可明显抑制HT-29细胞的增殖活性（P<0.01）、迁移能力（P<0.01）、相关蛋白（SETD5、p-PI3K、p-AKT1、p-mTOR 蛋白）的表达（均P<0.01）、促进细胞凋亡（P<0.01）,且提高其对 5-FU 的敏感性（P<0.01）,这些作用均可被 AKT 激活剂 SC79 部分阻挡（P<0.05 或 P<0.01）。结论：SETD5在HT-29、LoVo细胞中高表达,SETD5通过PI3K/AKT1通路促进结肠癌HT-29细胞的增殖、迁移,且降低其对5-FU的敏感性,SETD5是结肠癌临床诊断、治疗的潜在靶点。     

颧骨缝牵张成骨过程中组织超微结构变化的研究

目的:观察天然骨缝牵张成骨过程中组织和细胞超微结构的变化。方法:对牵张成骨的缝区组织经过系列处理,进行超薄切片、透射电镜观察。结果:间充质细胞在牵引早期大量增生,并不断分化为成纤维细胞和成骨细胞,后2种细胞的超微结构显示出具有活跃的合成和分泌功能。1周标本成纤维细胞沿牵引力的长轴方向排列,胞核增大,在其周围包绕着发达并扩张的内质网系统;3周标本大量增生活跃的成骨细胞和成纤维细胞,成骨细胞核仁增大、粗面内质网扩张、核糖体丰富、线粒体增多、富含紧密排列的嵴;5、8周标本中骨细胞形成并发育成熟,骨基质逐渐矿化,清晰可见新形成的胶原纤维、哈氏管,以及骨基质矿化的过程。结论:三维牵张过程中,成纤维细胞、成骨细胞活跃,缝区形成新骨。     

不同公式计算角膜屈光术后白内障患者IOL屈光度的准确性比较

目的：对比观察5种人工晶状体(IOL)计算公式在角膜屈光术后白内障患者IOL屈光度计算中的准确性。

方法：前瞻性系列病例研究。收集2021-09/2023-03就诊于济南明水眼科医院的既往行角膜屈光手术矫正近视的白内障患者23例34眼,其中准分子角膜切削术(PRK)手术史1例1眼,准分子原位角膜磨镶术(LASIK)术后22例33眼。白内障术前采用IOL Master 700测量眼生物学参数; Pentacam眼前节分析系统测量角膜真实净屈光力(TNP); 眼前节OCT测量净角膜屈光力(NCP)、角膜后表面屈光力、角膜厚度(CCT)。采用Shammas公式、Haigis-L公式、Potvin-Hill Pentacam公式、OCT公式、Barrett True K公式进行IOL度数计算后综合选择合适的IOL度数。术后1 mo在客观验光的基础上行主觉验光获得术后实际屈光状态,根据术后验光结果计算5种公式的屈光预测误差(RPE),其绝对值为屈光绝对误差(RAE),比较RPE与0的差异及不同公式间RPE、RAE的差异,并统计RAE≤0.5 D、≤1.0 D的眼数所占百分比。

结果：5种公式计算所得的RPE与0比较均无差异(均P>0.05)。5种计算公式的RPE、RAE整体无差异(F=0.554,P=0.696; H=4.402,P=0.354); Potvin-Hill Pentacam公式、Barrett True K公式的RAE在≤0.5 D内的眼占比分别为26眼(76%)、24眼(71%),在≤1.0 D内的眼占比均为33眼(97%)。

结论：Barrett True K 公式、Potvin-Hill Pentacam公式在角膜屈光术后白内障患者IOL屈光度计算中表现出较高的预测性。由于此类人群角膜屈光力存在差异,IOL度数计算问题仍需要进一步研究,临床上建议多种公式综合考虑。     

亚甲基四氢叶酸还原酶C677T基因多态性与2型糖尿病合并冠心病的关系

目的 研究同型半胱氨酸代谢关键酶亚甲基四氢叶酸还原酶（methylenetetrahydrofolate reductase,MTHFR）基因C677T多态性与糖尿病合并冠心病发病的关系,探讨MTHFR是否为糖尿病合并冠心病的易感基因。方法 研究对象包括105名糖尿病合并冠心病的患者（合并组）、88名单纯糖尿病患者（糖尿病组）和91名健康人。应用聚合酶链反应-限制性内切酶长度多态性方法（PCR—RFLP）检测MTHFR C677T基因多态性,同时检测血浆同型半胱氨酸（homocysteine,Hcy）、叶酸、维生素B12、各种血脂。结果 合并组与糖尿病组比,等位基因频率差异有统计学意义（Х^2=6．8,P〈0．05）,合并组T等位基因的OR值为1．638（95％ CI,1．082～2．479）,基因型频率差异亦有统计学意义（Х^2=5．481,P〈0．05）。Logistic回归分析显示MTHFR 677携带T基因（CT＋TT）的OR值为2．68（95％ CI,1．233—5．824）。结论 MTHFR 677携带T基因与2型糖尿病合并冠心病发生独立相关。检测MTHFR 677位点基因特点可能为糖尿病合并冠心病的预防以及个体化治疗提供新思路、新方法。     

覆盖义齿基牙的短期临床观察

目的：对覆盖义齿的基牙进行短期临床观察。方法：对30例覆盖义齿修复患者半年及1年后回访观察。结果：下颌基牙及非银汞充填覆盖基牙更易存积菌斑及结石,并出现牙龈问题。结论：对于能保持良好口腔卫生的患者,覆盖义齿是一种较好的选择。