蓝莓花青素诱导口腔癌KB细胞凋亡的实验研究

目的研究蓝莓花青素对人口腔癌KB细胞体内抑制作用,并从凋亡角度来探讨其机制。方法 20只BALB/c Nude免疫缺陷小鼠(裸鼠),构建人口腔癌KB细胞裸鼠异位移植瘤模型后,随机分为模型组,阳性对照组(顺铂组),蓝莓花青素低、中、高剂量组,每组4只。蓝莓花青素低、中、高剂量组分别给予蓝莓花青素25、50、100 mg/kg腹腔注射,模型组给予生理盐水10 mg/kg腹腔注射,顺铂组给予顺铂4 mg/kg腹腔注射。每3 d给药1次,连续给药21 d,末次给药后3 d处死动物。给药期间测取肿瘤长/短径,计算瘤体体积、抑瘤率;动物处死后摘除肿瘤组织,TUNEL法观察蓝莓花青素对移植瘤组织中细胞凋亡的影响;Western Blot检测瘤组织凋亡相关蛋白Bcl-2、Bax、C-caspase3和C-caspase9的表达水平。结果蓝莓花青素组裸鼠异位移植瘤体积较模型组均明显缩小,差异有统计学意义(P<0.05)。蓝莓花青素低、中、高剂量组抑瘤率分别为47.2%、46.2%、50.9%。蓝莓花青素处理的裸鼠异位移植瘤细胞凋亡率与模型组相比,差异具有统计学意义(P<0.01)。蓝莓花青素能明显上调凋亡相关蛋白C-caspase3、C-caspase9和Bax的表达(P<0.05),且呈一定的剂量依赖性,下调Bcl-2蛋白表达水平(P<0.05),并呈剂量依赖性下降。结论蓝莓花青素具有较好的抗肿瘤作用,可能通过调节内源性凋亡而抑制肿瘤细胞在体内增殖。     

解脲脲原体LAMPs激活核因子κB诱导人单核细胞表达诱导型一氧化氮合酶和前炎症因子

目的分析解脲脲原体（Uu）的脂质相关膜蛋白（LAMPs）对人单核细胞（THP-1）表达诱导型一氧化氮合酶（iNOS）和前炎症因子白细胞介素1β（IL-1β）、肿瘤坏死因子α（TNF-α）和白细胞介素6（IL-6）的影响。方法用Uu的LAMPs刺激人单核细胞后,Western blot法检测核因子κB（NF-κB）的激活和iNOS基因的表达,格氏试剂测定NO,ELISA法测定IL-1β、TNF-α和IL-6的含量。结果Uu LAMPs通过激活NF-κB诱导人单核细胞表达iNOS,且能以时间和剂量依赖方式刺激人单核细胞产生NO,诱导表达前炎症因子（IL-1β、TNF-α和IL-6）;NF-κB抑制剂PDTC可抑制NF-κB的激活、iNOS的表达及NO的产生。结论Uu LAMPs通过激活NF-κB途径诱导人单核细胞表达iNOS和前炎症因子,可能是产生某些疾病的一个重要的因素。     

牙龈卟啉单胞菌唾液酸酶基因突变株黏附与侵入KB细胞能力研究

目的    研究PG0352基因缺失对牙龈卟啉单胞菌（P. gingivalis）黏附和侵入人口腔上皮癌KB细胞能力的影响。方法    本研究于2014年7—12月在中国医科大学口腔医学院中心实验室完成。实验组：将P. gingivalis W83菌株（W83菌株组）和PG0352基因突变株（PG0352突变株组）分别以100∶1的比例与KB细胞共培养2 h,制备P. gingivalis与KB细胞的黏附和侵入模型;对照组：单纯KB细胞培养。透射电镜观察KB细胞表面及细胞内是否有P. gingivalis存在;用PBS清除未黏附于KB细胞的细菌,裂解细胞后涂板检测P. gingivalis黏附和侵入KB细胞情况,抗生素保护法检测P. gingivalis侵入KB细胞情况。结果    透射电镜结果发现,W83菌株组和PG0352突变株组KB细胞内均有细菌侵入;通过涂板后菌落计数发现P. gingivalis W83菌株和PG0352基因突变株对KB细胞的黏附率分别为（15.559 ± 2.020）%和（9.309 ± 1.750）%,侵入率分别为（0.651 ± 0.287）%和（1.517 ± 0.233）%,两者差异均有统计学意义（均P < 0.05）。结论    P. gingivalis W83菌株和PG0352基因突变株均能够黏附和侵入KB细胞;与W83菌株相比,PG0352基因突变株黏附上皮细胞的能力较弱而侵入能力较强。     

NF-κB、XIAP、bcl-2在胃肠道间质瘤中的表达及其与临床病理行为的关系

目的 探讨胃肠道间质瘤(GIST)中NF-κB、XIAP、bcl-2的表达及其与临床病理行为的关系。方法应用RT-PCR方法检测93例GIST标本及癌旁正常组织对照组中NF-κB、XIAP、bcl-2mRNA水平。结果 NF-κB、XIAP、bcl-2mRNA在GIST组织与对照组相比呈现高表达,三者之间正相关。NF-κB、XIAPmRNA表达的变化与NIH分级、肿瘤侵袭转移、粘膜受侵密切相关(P<0.05),但bcl-2mRNA表达无关(P>0.05)。结论 NF-κB、XIAP、bcl-2mRNA在GIST高表达。     

黄连温胆汤对代谢综合征大鼠核转录因子及肿瘤坏死因子的影响

目的:通过对代谢综合征大鼠主动脉核转录因子及肿瘤坏死因子的检测,探讨黄连温胆汤对该指标的影响及其机制。方法:将8周龄雄性SD大鼠分组采用膳食饲料喂养,建立MS大鼠模型后将MS大鼠随机分为模型组,格华止组,黄连温胆汤高、低剂量组,灌胃4周后,检测体质量、血压、血糖、血清胰岛素、血脂、TNF-α,计算lee's指数和胰岛素敏感指数,测定大鼠主动脉NF-κB的表达。结果:与空白组比较,MS组大鼠体质量、空腹血糖、血脂等差异均有统计学意义(P0.05)。黄连温胆汤高剂量组体质量、血脂、Lee's指数、HOMA-IR、TNF-α,与MS组大鼠比较均有统计学意义(P0.05),并且三组大鼠主动脉NF-κB表达均有统计学意义(P0.05)。结论:黄连温胆汤MS大鼠各组分有治疗作用,并且可以降低MS大鼠血清TNF-α,改善主动脉NF-κB的表达,其机制可能与核转录因子分子通路有关。     

A study on kinetic frictional properties in Begg/KB orthodontic appliances at posterior sites

In Begg and KB techniques, the kinetic frictional force generated between their characteristic orthodontic appliances at posterior sites and the orthodontic wire affects the efficiency of tooth movement. We compared the kinetic frictional force between the recent orthodontic appliances for posterior sites: the by-pass loop-KB buccal tube system (loop-KB tube system) and the conventional by-pass clamp-round buccal tube system (clamp-round tube system), and elucidated the frictional properties of the loop-KB tube system. We used 016"/018" round wires (016/018 round) and 022" × 016" ribbon wire (022 ribbon) with anchorage bend/curve applied. The results obtained were as follows:

核因子-κB表达与SIRS的关系及参附注射液干预作用的实验研究

目的:探讨NF-κB与全身炎症反应综合征(SIRS)的关系以及参附注射液的干预作用。方法:本实验设计为3组:正常对照组、脂多糖α(LPS)致伤组及参附注射液(SF)治疗组。采用静脉注射脂多糖(LPS)建立大鼠SIRS模型,并通过检测内毒素筛选成功模型。经相应处理后,各组分别检测不同时间点血液中单个核细胞核因子-κB(NF-κB)、血清肿瘤坏死因子-α(TNF-α)、白介素-6(IL-6)水平以及肺脏、肝脏组织的病理变化。结果:①LPS致伤后大鼠单个核细胞中NF-κB及TNF-α活性明显增高,2 h最明显(P0.05),其后逐渐下降;②血清IL-6浓度随着时间的推移不断升高(P0.05);③病理结果显示,LPS组肺组织出现肺泡出血、水肿,肺泡间隔弥漫性增厚、水肿和炎症细胞浸润;肝脏组织显示肝窦扩张、充血、局灶性肝细胞坏死。SF组肺脏和肝脏的上述损伤出现均明显减轻。SF组和LPS致伤组相比,可显著降低NF-κB活性、TNF-α及IL-6水平(P0.05),减轻肺脏和肝脏的病理损伤。结论:NF-κB等参与了SIRS的发生、发展,导致肺脏、肝脏损伤;参附注射液可能通过减少NF-κB的激活,减少TNF-α和IL-6的释放,减轻肺脏和肝脏的病理损伤,对SIRS起保护作用。     

Effect of remifentanil on toll-like receptor 4, NF-κB and IL-6 in rabbit myocardial ischemia/reperfusion model

Objective:To investigate whether remifentanil induced cardioprotecting effect is associated with expression of toll-like receptor 4 (TLR4).nuclear factor κB (NF-κB) and serum interleukin -6 (IL-6).Meth...     

Effects of Heat-Killed Levilactobacillus brevis KB290 in Combination with β-Carotene on Influenza Virus Infection in Healthy Adults: A Randomized Controlled Trial

Influenza, a seasonal acute respiratory disease caused primarily by the influenza virus A or B, manifests with severe symptoms leading to considerable morbidity and mortality and is a major concern worldwide. Therefore, effective preventive measures against it are required. The aim of this trial was to evaluate the preventive effects of heat-killed Levilactobacillus brevis KB290 (KB290) in combination with β-carotene (βC) on influenza virus infections in healthy Japanese subjects aged between 20 and 59 y throughout the winter season. We performed a randomized, double-blind, placebo-controlled, parallel-group trial from 16 December 2019 to 8 March 2020, comparing KB290 + βC beverage with placebo beverage. The primary endpoint was the incidence of influenza based on a doctor’s certificate. The incidence of influenza was not significantly different between the two groups. However, the subgroup analysis showed a significant difference between the two groups (influenza incidence: the KB290 + βC group 1.9%, and the placebo group 3.9%) in the subgroup of subjects aged ˂40 y, but not in the subgroup of subjects aged ≥40 y. The results of this trial suggest that the combination of KB290 and βC might be a possible candidate supplement for protection against the seasonal influenza virus infection in humans aged <40 y, although further clinical studies are needed to confirm the concrete preventive effect of this combination on influenza.