Inhibition of SLC26A4 regulated by electroacupuncture suppresses the progression of myocardial ischemia-reperfusion injury

Introduction:Myocardial ischemia-reperfusion(IR)injury has received widespread attention due to its damaging effects.Electroacupuncture(EA)pretreatment has preventive effects on myocardial IR injury.SLC26A4 is a Na+independent anion reverse transporter and has not been reported in myocardial IR injury.Objectives:Tofind potential genes that may be regulated by EA and explore the role of this gene in myocardial IR injury.Methods:RNA sequencing and bioinformatics analysis were performed to obtain the differentially expressed genes in the myocardial tissue of IR rats with EA pretreatment.Myocardial infarction size was detected by TTC staining.Serum CK,creatinine kinase-myocardial band,Cardiac troponin I,and lactate dehydrogenase levels were determined by ELISA.The effect of SLC26A4 on cardiomyocyte apoptosis was explored by TUNEL staining and western blotting.The effects of SLC26A4 on inflammation were determined by HE staining,ELISA,and real-time PCR.The effect of SLC26A4 on the NF-κB pathway was determined by western blotting.Results:SLC26A4 was up-regulated in IR rats but downregulated in IR rats with EA pretreatment.Compared with IR rats,those with SLC26A4 knockdown exhibited improved cardiac function according to decreased myocardial infarction size,reduced serum LDH/CK/CK-MB/cTnI levels,and elevated left ventricular ejection fraction and fractional shortening.SLC26A4 silencing inhibited myocardial inflammation,cell apoptosis,phosphorylation,and nuclear translocation of NF-κB p65.Conclusion:SLC26A4 exhibited promoting effects on myocardial IR injury,while the SLC26A4 knockdown had an inhibitory effect on the NF-κB pathway.These results further unveil the role of SLC26A4 in IR injury.

Visualizing Complex Anatomical Structure in Bamboo Nodes Based on X-ray Microtomography

In recent years,bamboo has been widely used in a broad range of applications,a thorough understanding of the structural characteristics of bamboo nodes is essential for better processing and manufacturing of biomimetic materials.This study investigated the complex anatomical structure for the nodes of two bamboo species,Indocalamus latifolius(Keng)McClure and Shibataea chinensis Nakai,using a high-resolution X-ray microtomography(μCT).The results show that the vascular bundle system in the nodal region of I.latifolius and S.chinensis is a net-like structure composed of horizontal and axial vascular bundles.Furthermore,the fiber sheath surrounding metaxylem vessels tended to be shorter in the tangential direction.This structure of bamboo nodes facilitates the tangential and axial transport of moisture and nutrients.The anatomical structure of I.latifolius and S.chinensis nodes has obvious differences,especially in the arrangement of vascular bundles.Vascular bundle frequency was significantly higher in S.chinensis nodes than in I.latifolius nodes.These findings indicate thatμCT is a nondestructive three-dimensional imaging method that can used to examine the anatomical structure of bamboo nodes.

正视儿童脉络膜厚度的分布特征及相关影响因素

目的:应用扫频源光学相干断层扫描血流成像技术(SS-OCTA)观察正视儿童黄斑区脉络膜厚度(CHT)的分布特征,并探讨其相关影响因素。方法:横断面研究。连续性纳入2021年5—9月在郑州大学第一附属医院眼科就诊的6~12岁正视儿童63例。以黄斑中心凹为中心,使用SS-OCTA测量黄斑区的CHT和脉络膜血管指数(CVI),根据ETDRS分区将图像划分为3个环区:黄斑中心凹区(直径0~1 mm)、内环区(直径1~3 mm)和外环区(直径3~6 mm)。均纳入右眼数据分析。采用单因素方差分析比较3个环区和内、外环区的上方、颞侧、下方和鼻侧4个区域的CHT,并采用单因素线性回归和多元线性回归分析3个环区的CHT与性别、年龄、屈光度、父母屈光度、眼轴长度、瞳孔直径和CVI等参数的相关性。结果:黄斑中心凹区、内环区和外环区的CHT分别为(320±58)(315±55)(299±47)μm(F=2.77,P=0.065),外环区的CHT比黄斑中心凹区的CHT薄(t=2.20,P=0.025),其余两两环区CHT相比,差异均无统计学意义(均P>0.05)。黄斑中心凹区和内、外环区的上方、颞侧、下方及鼻侧共9个区域的CHT相比,总体差异有统计学意义(F_(不同区域)=19.20,P<0.001),在内环区和外环区的上方、颞侧、下方和鼻侧4个区域的CHT相比,差异均有统计学意义(F_(内环区)=8.15,P<0.001;F_(外环区)=43.11,P<0.001),均是鼻侧最薄。经单因素线性回归分析,黄斑中心凹区、内环区的CHT均与瞳孔直径相关(β=14.31,P=0.035;β=13.88,P=0.039);黄斑中心凹区、内环区和外环区的CHT均与对应环区的CVI相关(β=264.60、335.87、463.22,均P<0.001)。去除混杂因素后,经多因素线性回归分析发现黄斑中心凹区、内环区和外环区的CHT均与对应环区的CVI呈正相关(β=233.96、306.93、429.25,均P<0.001),其中黄斑中心凹区、内环区的CHT与瞳孔直径呈正相关(β=18.32、17.56,P=0.023、0.027);内环区和外环区的CHT与性别有相关性(β=24.92、23.50,P=0.043、0.038);外环区的CHT与年龄呈正相关(β=10.71,P=0.025);与其余参数间无相关性。结论:6~12岁正视儿童黄斑外环区的CHT比黄斑中心凹区的薄,且内、外环区的鼻侧最薄。男性、年龄越大、瞳孔直径越大和CVI越大的儿童,黄斑各环区的CHT越厚。