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1.
项桐伟  李纪鹏  俞万钧 《浙江医学》2021,43(23):2604-2607,2612
环状RNA(circRNAs)是一类具有共价闭合连续环结构的内源性非编码RNA,越来越多的证据表明circRNAs在多种肿瘤中异常表达,并参与肿瘤恶性进展。最近研究报道,circRNAs可以调节免疫细胞功能,募集免疫相关分子,影响肿瘤微环境,进而促进肿瘤细胞免疫逃逸。本文就circRNAs与免疫细胞、免疫相关分子以及circRNAs在肿瘤免疫中的作用研究作一综述。  相似文献   

2.
环状RNA(circRNAs)是一种无3’聚腺苷化[poly-(A)]尾或5’帽的共价闭合环结构非编码RNA(ncRNA),是一个崭新的研究领域。环状RNA最早于20世纪70年代在RNA病毒中被发现,但由于传统的多聚腺苷酸转录组分析的局限性,最初发现的circRNAs数量很少。由于特定的生化和计算方法的发展,近年来的研究表明,大量circRNAs在真核转录组中自然而广泛地存在。研究发现circRNAs在多种生理和病理过程中发挥重要作用,如充当miRNA海绵、与RNA结合蛋白(RBP)结合、作为转录调控因子,甚至作为翻译模板。研究者认为circRNAs可能是与各种疾病的诊断、疗效和预后相关的潜在生物标志物,由于其稳定性和组织及发育阶段的特异性,可能成为有效的治疗靶点。本综述重点讨论circRNAs的特性及其免疫功能并揭示其在免疫相关疾病中的作用。  相似文献   

3.
目的:利用RNA高通量测序和生物信息学分析筛选出调控食管胃结合部腺癌(adenocarcinoma of esophagogastric junc-tion,AEG)增殖、侵袭能力的关键环状RNA分子,并对其作用方式进行初步探究。方法:提取22对食管胃结合部腺癌组织及癌旁正常黏膜组织的RNA。采用RNA高通量测序(测序深度200×),利用生物信息分析云平台进行差异基因筛选,同时对差异表达的基因构建共表达网络和circRNAs-miRNAs-mRNAs间的内源性RNA竞争机制(ceRNA)网络;利用RNA图谱共表达网络构建和内源性竞争RNA负相关分析,筛选出在AEG发生过程中可能发挥关键作用的circRNAs。并预测可与该circRNA存在ceRNA关系的miRNAs和mRNAs;通过qRT-PCR等方法对该circRNA在胃癌组织、癌旁组织中的表达进行验证。结果:通过RNA高通量测序,共预测得到46 553个circRNAs,对测序数据进行严格质控,得到26个差异表达的circRNAs(fold change≥2或fold change≤0.5,false discovery rate<0.05),其中10个circRNAs表达上调,16个circRNAs 表达下调。对组织样本进行mRNA和miRNA测序分析,构建circRNAs-miRNAs-mRNAs间的ceRNA网络、RNA图谱共表达网络和内源性竞争RNA负相关分析。结果表明,has_circ_0007766在AEG肿瘤组织中特异性高表达,可能在AEG发生发展过程中起关键作用;同时发现,miR4492与circRNA0007766和MET mRNA均有结合位点。结论:has_circ_0007766可能通过miR4492-circRNA0007766-MET mRNA的ceRNA网调控食管胃结合部腺癌增殖、侵袭,是AEG发生发展的关键circRNA。  相似文献   

4.
环状RNA是一类不具有5′末端帽子和3′末端poly(A)尾巴,由共价键形成闭环结构的RNA分子。大多数环状RNA广泛而稳定的存在于多种生物中,并且具有组织和细胞特异性。环状RNA能充当 microRNA 海绵,影响基因表达和调控,还能与蛋白质结合,作用于蛋白质翻译环节。越来越多研究表明,环状RNA在心血管疾病中起重要作用。本文总结了环状RNA的生物合成和功能方面的最新研究成果,对其在心肌梗死、心力衰竭、动脉粥样硬化、糖尿病心肌病等心血管疾病中的作用及机制进行综述,为诊断和治疗心血管疾病提供新思路。  相似文献   

5.
环状核糖核酸(circular ribonucleic acid, circRNA)是肝细胞性肝癌(hepatocellular carcinoma, HCC)与RNA领域研究的新热点之一。与传统含5′和3′末端的线性RNA不同,circRNA分子呈封闭环状结构,为一类特殊的非编码RNA分子,富含microRNA(miRNA)结合位点,在肝细胞中起miRNA海绵(miRNA sponge)作用,以竞争性内源RNA机制调控miRNA抑制/促进靶基因表达,在HCC进展中起重要作用。本文述评了circRNA在HCC进展中表达、调控机制及其潜在价值。  相似文献   

6.
骨关节炎(osteoarthritis,OA)是常见的关节退行性病变,常表现为关节疼痛及活动受限。不可逆的软骨退变与软骨下骨骨质破坏是其最主要的病理改变。OA早期诊断困难,大多数晚期患者因此接受关节置换。环状RNA(circRNAs)是一类特殊的非编码RNAs,由碱基组成闭环结构,广泛存在真核生物中。作为调节细胞代谢的重要分子,circRNAs近年来被发现在骨关节炎中异常表达,参与软骨破坏及关节无菌性炎症等生物学行为。同时,circRNAs的环状结构使其能在血液中稳定存在,具有骨关节炎早期诊断、疗效评估及治疗的潜力。现就circRNAs及其在骨关节炎调控的研究进展展开论述。  相似文献   

7.
目的: 研究胃癌组织环状RNA(circular RNAs,circRNAs)表达的变化,以及circRNAs-miRNAs-mRNAs的竞争性内源RNA网络调控的机制。方法: 从GEO(Gene Expression Omnibus)数据库中选出GSE78092、GPL19978(GSE83521和GSE89143)、GSE100170和STAD(未上传)共5个数据集,分析其差异表达circRNAs,并利用Starbase、TargetScan等数据库进行生物信息学分析。结果: 从胃癌组织与癌旁组织共获得734个差异表达的circ-RNAs,根据P<0.05、差异表达倍数>1.5倍筛选得到17个circRNAs。用Starbase数据库分析circRNAs和miRNAs的互作关系,共发现354个靶miRNAs,并利用GEO数据库(GSE23739)验证筛选得到46个miRNAs,利用TargetScan数据库分析其靶向的mRNAs。京都基因与基因组百科全书(kyoto encyclopedia of genes and genomes,KEGG)分析和基因本体论(gene ontology,GO)分析表明靶基因主要在转录调控、RNA代谢过程、细胞内信号级联和蛋白质定位等方面促进或者抑制胃癌的发生发展。结论: 差异分析表达的17个circRNAs形成circRNAs-miRNAs-mRNAs的竞争性内源RNA网络,可通过调控转录和RNA代谢等过程调节胃癌的发生发展。  相似文献   

8.
<正>众所周知,在女性的生命周期中,卵巢功能与女性健康息息相关。但是到目前为止,多囊卵巢综合征(polycystic ovarian syndrome,PCOS)、卵巢衰老和卵巢肿瘤等与卵巢相关性疾病的发生机制或者可以预先检测的指标尚未完全明晰。近年来,环状RNA(circular RNAs,circRNAs)越来越受到研究者们的关注。现有研究表明,circRNAs与妇产科疾病发展有密切的联系,尤其在卵巢相关性疾病的诊断和治疗中,发挥出独特的作用,有望成为卵巢性疾病诊疗的一个新的突破点。  相似文献   

9.
环状RNA(circularRNA, circRNA)代表一大类存在于广泛的真核细胞质中的非编码RNA,作为miRNA的分子海绵来调控基因的转录过程。尽管circRNA在泌尿系疾病中的研究还处于初步阶段,但近来研究表明其在泌尿系肿瘤的发生、发展和治疗中发挥着重要作用,有望成为潜在的新型分子标志物和分子靶向治疗的靶点。  相似文献   

10.
微小RNA(miRNAs或microRNAs)是一类长20~25个核苷酸的非编码内源性单链小RNA分子,通过与靶标信使RNA的3′端非翻译区结合,抑制其翻译或直接使其降解,对基因的表达起转录后的调控作用,进而调节细胞的增殖、分化和凋亡等。研究表明,部分微小RNA在恶性肿瘤的发生发展中起重要作用。因此,研究微小RNA为揭示恶性肿瘤发病机制提供新思路,为恶性肿瘤的诊断和治疗提供新策略。  相似文献   

11.
Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P< 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P< 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.  相似文献   

12.
Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P < 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (>0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P <0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P < 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.  相似文献   

13.
Objective: To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods: SD rats served as both donors and recipients. 4℃ sodium lactate Ringer's was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava (IVC) inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results: Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion: This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.  相似文献   

14.
Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.  相似文献   

15.
Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.  相似文献   

16.
A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care(~'4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.  相似文献   

17.
Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.  相似文献   

18.
Journal of Nanjing Medical University (English Edition) JNMU, sponsored by Nanjing Medical University, was established in 1987. It is a bimonthly comprehensive English medical journal published locally and abroad.Since 2007, Journal of Nanjing Medical University (English Edition )was granted Elsevier the full publishing and distribution rights worldwide for the Electronic Edition, excluding the People's Republic of China.  相似文献   

19.
Objective To measure Derpl and Blot5 allergen levels in asthmatics' homes in Hongkong.Methods Seventy houses were enrolled for a mite indoor environment study. Dust samples were obtained from two sites of each patients' house: bed and floor. Derpl and Blot5 levels were quantified by a two-site monoclonal antibody-based ELISA technique.Results The levels of Derpl allergens found in bed (geometric mean (GM) 3.43 μg/g of dust; 95%CI, 1.89-4.96 μg/g)and on the floor (GM 1.12 μg/g of dust; 95%CI, 0.71-1.53 μg/g) indicated significant differences (P=0.005). However, the levels of Blot5 allergens found in bed (GM 19.00 μg/g of dust; 95%CI, 0.89-38.90 μg/g) and on the floor (GM 6.14 μg/g of dust; 95%CI, 0.40-11.90 μg/g) showed no statistically significant difference. In addition, in regards to the exposure index for Derpl and Blot5 allergens found in bed and on the floor, 17.6% in bed and 8.6% on the floor had levels of Blot5 ≥ 10 μg/g of dust, higher than those obtained for Derp1 (7.2% and 0% in bed and on the floor respectively, P< 0.05); higher percentages in bed and on the floor (25.0% and 35.7%) were observed for levels of Blot5 =0 μg/g of dust as compared with Derpl in bed and on the floor (4.3% and 14.5% respectively, P< 0.05).Conclusions Derpl and Blot5 are the major allergens found in this regional study, Blot5 is a more potent allergen in Hongkong, probably reflecting the high level of exposure to Blomia tropicalis (Bt). Bt and Dermatophagoides pteronyssinus (Dp) allergens should be included for precise diagnosis and effective immuno-therapeutic treatment of mite allergy in Hongkong.  相似文献   

20.
ANTI-PROLIFERATION EFFECT OF ORIDONIN ON HL-60 CELLS AND ITS MECHANISM   总被引:4,自引:0,他引:4  
Objcetive To investigate the anti-proliferation effect of oridonin on leukemic HL-60 cells and its mechanism. Methods HL-60 cells in vitro in culture medium were given different concentrations of oridonin. The inhibitory rate of cells were measured by microculture tetrazolium (MTT) assay, cell apoptotic rate was detected by flow cytometry (FCM), morphology of cell apoptosis was observed by hoechst 33258 fluorescence staining, and the activity of telomerase was detected using telomere repeat amplification protocol (TRAP) PCR-ELISA before and after apoptosis occurred. Results Oridonin could decrease telomerase activity, inhibit growth of HL-60 cells, and cause apoptosis significantly. The suppression was both in time- and dose-dependent manner. Marked morphological changes of cell apoptosis including condensation of chromatin and nuclear fragmentation were observed clearly by hoechst 33258 fluorescence staining especially after cells were treated 48-60 hours by oridonin. Conclusions Oridonin has apparent anti-proliferation and apoptotic effects on HL-60 cells in vitro, decreasing telomerase activity of HL-60 cells may be one of its most important mechanisms. These results will provide strong laboratory evidence of oridonin for clinical treatment of acute leukemia.  相似文献   

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