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The functionality of DNA biomacromolecules has been widely excavated, as therapeutic drugs, carriers, and functionalized modification derivatives. In this study, we developed a series of DNA tetrahedron nanocages (Td),
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Atrial fibrillation (AF) is one of the most common arrhythmias, associated with high morbidity, mortality, and healthcare costs, and it places a significant burden on both individuals and society. Anti-arrhythmic drugs are the most commonly used strategy for treating AF. However, drug therapy faces challenges because of its limited efficacy and potential side effects. Catheter ablation is widely used as an alternative treatment for AF. Nevertheless, because the mechanism of AF is not fully understood, the recurrence rate after ablation remains high. In addition, the outcomes of ablation can vary significantly between medical institutions and patients, especially for persistent AF. Therefore, the issue of which ablation strategy is optimal is still far from settled. Computational modeling has the advantages of repeatable operation, low cost, freedom from risk, and complete control, and is a useful tool for not only predicting the results of different ablation strategies on the same model but also finding optimal personalized ablation targets for clinical reference and even guidance. This review summarizes three-dimensional computational modeling simulations of catheter ablation for AF, from the early-stage attempts such as Maze III or circumferential pulmonary vein isolation to the latest advances based on personalized substrate-guided ablation. Finally, we summarize current developments and challenges and provide our perspectives and suggestions for future directions.
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@#Based on the three delivery forms of CRISPR/Cas9 system at the levels of DNA, RNA and protein, this paper mainly approaches the development and new strategies of CRISPR/Cas9 delivery systems, as well as their application in the biomedical field and the clinical treatment of gene-related diseases. By summarizing and elaborating the CRISPR/Cas9 system delivery and gene therapy strategy, new ideas are provided for the discovery of innovative drugs and the development of gene therapy.
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DNA nanocages are nanoscale three-dimensional polyhedral structures formed by self-assembled oligonucleotide strands by base pairing.DNA nanocages,especially the tetrahedron DNA nanocages,were proved to be potential nanocarriers for drug delivery,due to their good stablility,high compatibility,intracellular ablility and hollow cavity for modification and drug loading..In this paper,we reviewed the structural characteristics,synthetic methods and targeted modification of DNA nanocages,as well as their development and application in drug carriers,biological imaging,in vitro diagnosis and materials science.
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Pulsatile drug delivery system,capable of releasing drug at the predetermined times according to clinical therapeutic requirements,can be used to treat several rhythmic diseases.Majority of individuals experience the rise in the blood pressure in the early morning hours,which potentially leads to serious cardiovascular complications.The purpose of the study was to develop pulsatile candesartan cilexetil core-in-cup tablets according to human circadian rhythm of blood pressure.The factors influencing t_(lag) were evaluated by in vitro drug release and tablet erosion observations.In addition,the jugular artery pressures vs times courses of rabbits were recorded after oral administration of commercial candesartan cilexetil tablets or the developed core-in-cup tablets.The quantity and characteristics of the excipients in top layers in the tablets were found to modify t_(lag).In vivo studies showed that the onset times indicating the decreases in the blood pressures of commercial tablets and core-in-cup tablets were (98 ± 17) min and (278 ±29) min,respevtively.In vivo t_(lag) of the prepared core-in-cup tablets was (180 ± 34) min in rabbits,which is consistent with the goal of design.
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Objective To develop a HPLC method for the determination of oxymatrine in Oxymatrin Injection.Methods A RP-HPLC method with Lichrospher 5 ODS C18 column(4.6 mm? 250 mm,5 ? m) was used,and the mobile phase was the mixture of acetonnitrile-pH2.0 sulphate buffer solution(7∶93) at the f low rate of 1.0mL/min.The column temperature was 30 ℃,the UV detection wave length was 220 nm and the injection volume was 20 ? L.Results The calibra tion curve was linear(r=1.0000) in the range of 3.63～ 116.04 ? g/mL for oxyma trine.The mean recovery was 100.1 %(RSD=0.86 %,n=6).Conclusion Thi s method is effective and can be used for the determination of oxymatrine in Oxymatrine Injection.
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Objective To sutdy the anti-inflammatory action and pharmacodynamics of Liushen Cataplasm (LC). Methods The anti-inflammatory action of LC was observed on mice models of xylene-induced ear swelling and on the rat models of carrageenan-induced pedal swelling. With the decrease of pedal swelling as the parameter,the pharmacodynamics of LC was studied. The apparent parameters of pharmacodynamics were estimated based on the time-effect curve. Results LC showed a potent anti-inflammatory effect. The effect-time curve can be described by the one-compartment model. The main pharmacodynamic parameters were as follows:t1/2(Ka)=2.11727h,t1/2(Ke)=3.13464h,AUC=3.33131 mg?kg?h-1,respectively. Conclusion Liushen Cataplasm shows a potent anti-inflammatory effect. The effect-time curve can be described by the one-compartment model.
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After Puerarin Eyedrops was optimized,its stabilities in the conditions of high tempera- ture,low temperature,strong light and constrant temperature with constant humidity were studied by reversed phase HPLC.The analysis method was rapid,specific and precise.The average recovery was 99.42%.The results showed that the Puerarin Eyedrops had good thermostability and photostability.The shelf life of the Puerarin Eyedrops was 2 years.
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AIM: To establish a method of determining the content of total saponin of Radix et Rhizoma Notoginseng in buccal tablets by HPLC. METHODS: Chromatographic conditions are as follows:Hypersil NH_2 column(4.6 mm?200 mm,5 ?m) as the stationary phase,acetonitrile-1% phosphate buffer solution(0-10 min,20:80;10-20 min,25:75;20-25 min,45:55;25-30 min,50:50) as the mobile phase,the velocity of flow is 1.0 mL/min,the temperature of coloum is 35(?C) and the detection wavelength is 203 nm. RESULTS: The HPLC method has good linearity in determining the total saponin of Radix et Rhizoma Notoginseng content,and we can detect four saponins at the same time,linear range,ginsenoside Rg1 0.093 75-6 ?g,ginsenoside Re 0.011 72-0.75 ?g,notoginsenoside R1 0.023 44-1.5 ?g and ginsenoside Rb1 0.140 6-9 ?g,the correlation coefficient r=0.999 9. CONCLUSION: The established method in this article is simple and convenient,with good reproductivity.We can detect four saponins in the total saponin of Radix et Rhizoma Notoginseng Buccal Tablets at the same time by this method.It can be used for quality control of the total saponin of Radix et Rhizoma Notoginseng Buccal Tablets.