放疗干预对宫颈癌荷瘤小鼠的抑瘤作用及对Th1/Th2免疫细胞比例的影响

目的探讨放疗干预对宫颈癌荷瘤小鼠的抑瘤作用及其对辅助性T细胞1(Th1)/Th2细胞比例的影响。方法建立宫颈癌荷瘤小鼠模型,随机分为荷瘤组和放疗组,每组各10只,另设对照组10只。放疗组进行放疗干预14天,荷瘤组和对照组不治疗。放疗后4、6、8、10、12、14天测量肿瘤体积;末次治疗后,ELISA法测定血清干扰素-γ(IFN-γ)、白介素-2(IL-2)、IL-4、IL-10含量;计算抑瘤率、胸腺指数和脾脏指数;HE染色观察肿瘤组织学变化;TUNEL染色观察肿瘤组织细胞凋亡情况;流式细胞术检测脾脏Th1/Th2细胞比例;RT-qPCR和Western blot检测脾脏T盒子转录因子(T-bet)、GATA结合蛋白3(GABA-3)mRNA和蛋白表达。结果与荷瘤组比较,放疗组小鼠4、6、8、10、12、14天肿瘤体积及瘤质量减小,血清IL-2、IFN-γ升高,IL-4、IL-10降低,胸腺指数、脾脏指数升高,Th1细胞比例、Th1/Th2增加,Th2细胞比例减少,T-bet mRNA和蛋白及T-bet/GATA-3表达升高,GATA-3 mRNA和蛋白表达降低(P<0.05)。HE染色显示,荷瘤组肿瘤细胞数量较多,核大深染,无明显坏死;放疗组肿瘤细胞数量减少,出现大量坏死组织。TUNEL染色显示,荷瘤组TUNEL阳性细胞较少,放疗组TUNEL阳性细胞明显增多。结论放疗对宫颈癌荷瘤小鼠具有明显抑瘤作用,可能是通过调节T-bet/GATA-3表达,促进Th1/Th2分化平衡,增强机体免疫功能发挥作用。     

黄芩苷改善肿瘤缺氧微环境抑制乳腺癌移植瘤的生长＊

目的 通过观察黄芩苷对乳腺癌组织毛细血管通透性（Capillary Vessel Permeability，CVP）、赖氨酰氧化酶（Lysyl Oxidase，LOX）及血清丙二醛（Malondialdehyde，MDA）等相关指标的影响，探讨黄芩苷可能的抗乳腺癌作用机制。方法 通过在裸鼠皮下接种MDA-MB-231乳腺癌细胞株建立乳腺癌移植瘤模型；实验分为模型组、黄芩苷组、阿霉素组、黄芩苷+阿霉素组。于接种第7日开始：黄芩苷组每天灌胃黄芩苷水溶液（100 mg·kg^-1），连续14天；阿霉素组每3天腹腔注射一次阿霉素（5mg·kg^-1），共用药5次；模型组每天灌胃生理盐水（10 mL·kg^-1），连续14天；黄芩苷+阿霉素组每天灌胃黄芩苷水溶液（100 mg·kg^-1），连续14天，并每3天腹腔注射一次阿霉素5 mg·kg^-1，共5次。给药期间监测移植瘤体积；紫外可见分光光度计620 nm下测OD值来反映黄芩苷对肿瘤毛细血管通透性的影响；硫代巴比妥酸（Thiobarbituric acid，TBA）比色法检测黄芩苷对裸鼠血清中丙二醛（MDA）的影响；免疫组化染色法检测乳腺癌组织中赖氨酰氧化酶（LOX）的表达情况。结果 ①与模型组比较，黄芩苷组、阿霉素组、黄芩苷+阿霉素组瘤体重量均明显减轻（P<0.05）；黄芩苷+阿霉素组瘤体重量较阿霉素组明显减轻（P<0.05）。②与模型组比较，黄芩苷组降低乳腺癌组织毛细血管的通透性，而阿霉素组则增加肿瘤组织中毛细血管的通透性，差异均具有统计学意义（P<0.05）。③黄芩苷组能够明显抑制荷瘤裸鼠血清MDA的表达，与模型组比较差异有显著统计学意义（P<0.01）；阿霉素组促进MDA的表达，与模型组比较差异有统计学意义；黄芩苷+阿霉素组促进MDA的表达，与模型组比较差异无统计学意义。④与模型组比较，黄芩苷组裸鼠乳腺癌组织LOX的表达显著下调（P<0.01），阿霉素组肿瘤组织中LOX表达增加（P<0.05）；黄芩苷+阿霉素组能下调裸鼠乳腺癌组织LOX的表达，与模型组比较差异无统计学意义。结论 黄芩苷能够明显抑制乳腺癌移植瘤的生长，其机制可能与黄芩苷降低肿瘤组织毛细血管的通透性，抑制裸鼠血清中丙二醛、乳腺癌组织中赖氨酰氧化酶的表达，从而改变肿瘤缺氧微环境有关。     

Study on the Value of Ultrasound Elastography Combined with Plasma miRNA Expression in the Early Detection of Breast Cancer

Background: Breast cancer (BC) is the most common malignant tumor in women, and its morbidity and mortality are increasing each year, due to the lack of specific clinical symptoms in the early stage of BC, and the lack of diagnostic methods for early breast cancer. Therefore, identifying an effective diagnostic method for early BC has become urgent. Materials and Methods: Breast lesions with a histological diagnosis that were examined by ultrasonic elastography (UE) in our department from June 2020 to December 2021 were reviewed. qRT-PCR was performed to measure the expression levels of miR-144-5p and miR-26b-5p in the plasma of patients with BC. The receiver operating characteristics (ROC) curve and area under the curve (AUC) were used to investigate the potential diagnostic value of miR- 144-5p, miR-26b-5p and the elastographic score in BC. Results: The ultrasonic elastography score(UES) was found to be significantly upregulated in BC compared with that in benign breast lesions, and the AUC, sensitivity and specificity were 0.809, 0.717 and 0.806 for distinguishing BC from benign breast lesions, respectively. miR-144-5p and miR-26b- 5p were found to be upregulated in the plasma of BC patients, and miR-144-5p+miR-26b-5p had 0.781 sensitivity and 0.780 specificity for the diagnosis of BC. Furthermore, we found that the diagnostic performance of miR-144-5p and miR-26b-5p combined with UES for BC had 0.913 sensitivity and 0.890 specificity. Conclusions: The combination of plasma miR-144-5p, miR-26b-5p and UES has a very high clinical application value for the early detection of BC.     

Tumor-associated high endothelial venules mediate lymphocyte entry into tumors and predict response to PD-1 plus CTLA-4 combination immunotherapy

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主动脉出口血压对左心室血流特性的影响

采用Mimics对心脏进行三维重构，用3-matic进行模型优化以及模型误差分析，对左心室室壁运动做速度分布假设，基于UDF宏文件对左心室室壁运动编写程序，将血液视为非牛顿流体，采用动网格技术研究不同血压对左心室血液流动的影响。模拟发现当左心室收缩时，压力梯度明显，内部压力减小。当左心室舒张时，内部压力逐渐增高。二尖瓣口处的速率先增大后减小。血压升高，左心室内剪切应力持续增大，极易破坏红细胞结构，产生溶血现象，导致心脏功能紊乱。