Publications by authors named "Mengchen Yuan"

10 Publications

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Anti-inflammatory and immunomodulatory effects of baicalin in cerebrovascular and neurological disorders.

Brain Res Bull 2020 11 26;164:314-324. Epub 2020 Aug 26.

Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, 100700, Beijing, China. Electronic address:

Inflammatory responses play an extraordinary role in the pathogenesis of cerebrovascular and neurological disorders. Baicalin is one of the important flavonoids, which is extracted from Scutellaria baicalensis Georgi. Recently, numerous in vivo and in vitro studies have shown that baicalin has salutary effects for anti-inflammatory and immunomodulatory and has been demonstrated to exert beneficial therapeutic properties in cerebrovascular and neurological diseases. In this review, we aim to discuss that baicalin exerts anti-inflammatory effects through multiple pathways and targets, thus affecting the production of a variety of inflammatory cytokines and neuroprotective process of neurological diseases; furthermore, the related targets of the anti-inflammatory effects of baicalin were analyzed via using the tools of network pharmacology, to provide theoretical basis and innovative ideas for the future clinical application of baicalin.
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http://dx.doi.org/10.1016/j.brainresbull.2020.08.016DOI Listing
November 2020

A Pooled Analysis of the Prognostic Significance of Brugada Syndrome with Atrial Fibrillation.

Curr Pharm Des 2020 ;26(1):129-137

Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China.

Background: Guidelines have previously suggested that atrial fibrillation (AF) is associated with an increased risk of arrhythmic death in Brugada syndrome (BrS) patients. However, only two articles consisting of 17 AF patients with BrS supported these views. The risk stratification of BrS patients with AF remains controversial. Thus, a meta-analysis is used to estimate the risk stratification of BrS patients with AF.

Methods: We searched for relevant studies published from 2000 to December 30, 2018. A total of 1712 patients with BrS from five studies were included: 200 patients (12%) were reported with AF, among whom 37 patients (19%) had arrhythmic events.

Results: BrS patients with AF in all studies (OR 1.92, 95% CI:0.91to 4.04, P =0.09; Heterogeneity: P = 0.03, I2=61%) and some European studies (OR 1.12, 95% CI: 0.18 to 6.94, P=0.91; Heterogeneity: P = 0.006, I2=80%) did not display a higher risk of arrhythmic events than those without AF, but BrS patients with AF in Japanese studies (OR 2.32, 95% CI: 1.37 to 3.93, P=0.002; Heterogeneity: P = 0.40, I2=0%) had a higher risk of arrhythmic events than those without AF. The proportion of BrS patients with AF was greater in Japanese studies than in some European studies (16% vs. 9%, P<0.001).

Conclusion: On the whole, BrS patients with AF showed no higher risk of arrhythmic events than those without AF, but BrS patients with AF in Japan had a higher risk of arrhythmic events than those without AF.
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http://dx.doi.org/10.2174/1381612826666200114112029DOI Listing
November 2020

Does heart failure increase the risk of incident cancer? A meta-analysis and systematic review.

Heart Fail Rev 2020 11;25(6):949-955

Guang'an men Hospital, China Academy of Chinese Medical Sciences, Beijing, China.

Recently, several studies have demonstrated that heart failure (HF) may increase the risk of incident cancer. However, this association has not been statistically and systematically verified by any comprehensive pooled analyses. We performed a meta-analysis on cancer morbidity and co-mortality of adults with HF in a large sample size to explore the relationship between HF and the risk of developing cancer. From inception to April 2019, we searched PubMed and EMBASE for published relevant articles on patients with HF diagnosed with cancer afterwards, with reported outcomes of morbidity and mortality. Two investigators independently reviewed these included studies. Study data were independently extracted using predefined data extraction forms. Random and fixed-effects models were fit for the study duration. This analysis consisted of 4 cohort studies comprising 5,004,251 participants. The relative risk (RR) for incident cancer was 1.22 (95% confidence interval (CI), 1.13-1.33) indicating that patients with HF may have a higher risk of developing cancer. The pooled RR of co-mortality was 2.03 (95% CI, 1.13-3.65), indicating that HF associated with cancer increases the risk of mortality. In this meta-analysis and systematic review, our results demonstrated that heart failure may increase the risk of incident cancer and that HF associated with cancer increases the risk of mortality.
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http://dx.doi.org/10.1007/s10741-019-09876-0DOI Listing
November 2020

Efficacy and Safety of NaoShuanTong Capsule in the Treatment of Ischemic Stroke: A Meta-Analysis.

Front Pharmacol 2019 11;10:1133. Epub 2019 Oct 11.

Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China.

Ischemic stroke (IS) is a leading cause of death and long-term disability worldwide. The NaoShuanTong capsule (NSTC), a traditional Chinese patent medicine, has been extensively used in the treatment of stroke in China. However, the clinical efficacy and safety of this treatment has not been statistically and systematically verified by any comprehensive pooled analysis. We therefore performed a meta-analysis to evaluate the efficacy and safety of NSTC in the treatment of IS. Randomized controlled trials (RCTs) of NSTC in the treatment of IS conducted before September 2018 were retrieved from five databases, according to specific inclusion and exclusion criteria. Two investigators independently reviewed the included studies and extracted relevant data. The methodological quality of the included studies was assessed using criteria from the Cochrane Handbook, and analyzed using Review Manager 5.3 software. Thirteen RCTs comprising a total of 1,360 participants were included in this study. NSTC was shown to significantly improve the overall response rate ( = 3.04, 95% CI [1.76, 5.26], < 0.00001), and neurological function (NSTC increased Modified Barthel Index ( = 8.15, 95% CI [3.79, 12.52], = 0.0005), Functional Independence Measure ( = 29.61, 95% CI [10.11, 49.10], = 0.003) and European Stroke Scale scores ( = 8.51, 95% CI [7.00, 10.01], = 0.03). In addition, NSTC significantly increased serum adiponectin level ( = 0.66, 95% CI [0.23, 1.08], = 0.002). Moreover, NSTC reduced atherosclerotic plaque area ( = -2.24, 95% CI [-4.02, -0.46], = 0.01) and intima-media thickness ( = -0.09, 95% CI [-0.13, -0.05], < 0.0001). However, there was no significant difference between NSTC treatment and conventional therapy with respect to Fugl-Meyer Assessment score ( = 10.59, 95% CI [-1.78, 22.96], = 0.09) or Crouse score ( = -0.78, 95% CI [-1.79, -0.22], = 0.13). The results of this meta-analysis showed that NSTC exhibits efficacy in the treatment of cerebral infarction. NSTC can improve the overall response rate and neurological function, increase blood adiponectin, reduce neurological deficits, and decrease atherosclerotic plaque area.
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http://dx.doi.org/10.3389/fphar.2019.01133DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6797837PMC
October 2019

Regulatory Mechanisms of the NLRP3 Inflammasome, a Novel Immune-Inflammatory Marker in Cardiovascular Diseases.

Front Immunol 2019 10;10:1592. Epub 2019 Jul 10.

Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beijing, China.

The nod-like receptor family pyrin domain containing 3 (NLRP3) is currently the most widely studied inflammasome and has become a hot topic of recent research. As a macromolecular complex, the NLRP3 inflammasome is activated to produce downstream factors, including caspase-1, IL-1β, and IL-18, which then promote local inflammatory responses and induce pyroptosis, leading to unfavorable effects. A growing number of studies have examined the relationship between the NLRP3 inflammasome and cardiovascular diseases (CVDs). However, some studies have shown that the NLRP3 inflammasome is not involved in the occurrence of certain diseases. Therefore, identifying the mechanism of action of the NLRP3 inflammasome and its potential involvement in the pathological process of disease progression is of utmost importance. This review discusses the mechanisms of NLRP3 inflammasome activation and the relationship between the inflammasome and CVDs, including coronary atherosclerosis, myocardial ischemia/reperfusion, cardiomyopathies, and arrhythmia, as well as CVD-related treatments.
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http://dx.doi.org/10.3389/fimmu.2019.01592DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6635885PMC
June 2020

Anticancer Therapy-Induced Atrial Fibrillation: Electrophysiology and Related Mechanisms.

Front Pharmacol 2018 16;9:1058. Epub 2018 Oct 16.

Key Laboratory of Chinese Internal Medicine of the Ministry of Education, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing, China.

Some well-established immunotherapy, radiotherapy, postoperation, anticancer drugs such as anthracyclines, antimetabolites, human epidermal growth factor receptor 2 blockers, tyrosine kinase inhibitors, alkylating agents, checkpoint inhibitors, and angiogenesis inhibitors, are significantly linked to cardiotoxicity. Cardiotoxicity is a common complication of several cancer treatments. Some studies observed complications of cardiac arrhythmia associated with the treatment of cancer, including atrial fibrillation (AF), supraventricular arrhythmias, and cardiac repolarization abnormalities. AF increases the risk of cardiovascular morbidity and mortality; it is associated with an almost doubled risk of mortality and a nearly 5-fold increase in the risk of stroke. The occurrence of AF is also usually researched in patients with advanced cancer and those undergoing active cancer treatments. During cancer treatments, the incidence rate of AF affects the prognosis of tumor treatment and challenges the treatment strategy. The present article is mainly focused on the cardiotoxicity of cancer treatments. In our review, we discuss these anticancer therapies and how they induce AF and consequently provide information on the precaution of AF during cancer treatment.
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http://dx.doi.org/10.3389/fphar.2018.01058DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6198283PMC
October 2018

Gender Differences in Prognosis and Risk Stratification of Brugada Syndrome: A Pooled Analysis of 4,140 Patients From 24 Clinical Trials.

Front Physiol 2018 22;9:1127. Epub 2018 Aug 22.

Guang'anmen Hospital, Chinese Academy of Chinese Medical Sciences, Beijing, China.

Male gender has been consistently shown to be a risk factor for a greater number of arrhythmic events in patients with Brugada Syndrome (BrS). However, there have been no large-scale comprehensive pooled analyses to statistically and systematically verify this association. Therefore, we conducted a pooled analysis on gender differences in prognosis and risk stratification of BrS with a largest sample capacity at present. We searched PubMed, Embase, Medline, Cochrane Library databases, Chinese National Knowledge Infrastructure, and Wanfang Data for relevant studies published from 2002 to 2017. The prognosis and risk stratification of BrS and risk factors were then investigated and evaluated according to gender. Twenty-four eligible studies involving 4,140 patients were included in the analysis. Male patients (78.1%) had a higher risk of arrhythmic events than female patients (95% confidence interval: 1.46-2.91, < 0.0001). Among the male population, there were statistical differences between symptomatic patients and asymptomatic patients (95% CI: 2.63-7.86, < 0.00001), but in the female population, no statistical differences were found. In the female subgroup, electrophysiological study (EPS) positive patients had a tendency toward a higher risk of arrhythmic events than EPS-negative patients (95% CI: 0.93-29.77, = 0.06). Male patients are at a higher risk of arrhythmic events than female patients. Within the male population, symptomatic patients have a significantly higher risk profile compared to asymptomatic patients, but no such differences are evident within the female population. Consequently, in the female population, the risk of asymptomatic patterns cannot be underestimated.
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http://dx.doi.org/10.3389/fphys.2018.01127DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6113678PMC
August 2018

Mechanisms and Treatments of Oxidative Stress in Atrial Fibrillation.

Curr Pharm Des 2018 ;24(26):3062-3071

Guang'an men Hospital, Chinese Academy of Chinese Medical Sciences, Beijing 100053, China.

Atrial fibrillation (AF) is a frequent cardiac arrhythmia. It is a common major cause of serious diseases and is an increasing health-care burden. AF is associated with an excess amount of reactive oxygen species. In this review, we summarize several possible reactive oxygen species pathways that induce AF based on atrial electrical and structural remodeling data. The sources and factors implicated in AF-related oxidative stress include NADPH oxidase activation, calcium overloading and mitochondrial damage, angiotensin system activation, nitric oxide synthase uncoupling, and xanthine oxidase activation-associated cardiovascular conditions. Scavenging oxidative stress markers and related substances are essential aspects of these molecular mechanisms, and may be a therapeutic target in AF.
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http://dx.doi.org/10.2174/1381612824666180903144042DOI Listing
October 2019

Mitochondria and the Pathophysiological Mechanism of Atrial Fibrillation.

Curr Pharm Des 2018 ;24(26):3055-3061

Guang'an men Hospital, Chinese Academy of Chinese Medical Sciences, Beijing 100053, China.

Atrial fibrillation (AF) is the most common and significant cardiac arrhythmia in clinical practice, however the pathophysiological mechanism of AF has not been fully explained. At present, there are no available treatment options that can target the underlying pathophysiological processes of AF. Research on improving management strategies for AF can start with a further understanding of the changes of cells in AF. Mitochondria play central roles in the function of cardiac myocytes and many of the pathophysiological processes implicated in AF are relative to mitochondrial function, including formation of reactive oxygen species (ROS), calcium homeostasis, and alterations of oxygen consumption. The changes of levels of phosphocreatine, electron transfer chain proteins and differences in mitochondrial distribution further imply that mitochondria play a role in AF. Related studies of recent years are summarized, in order to elucidate the causal relationship between mitochondria and AF, and provide potential therapeutic target for the treatment and prevention of AF in clinical practice. In the article, we summarize the direct or indirect factors that affect mitochondria function and thus cause AF, including anticancer agents, surgery, gene, age, air pollution, oxidative stress, and β3-adrenoceptor (β3-AR). There is a close relationship between mitochondrial dysfunction and the occurrence of AF, which cannot be ignored, and further research in this area is needed.
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http://dx.doi.org/10.2174/1381612824666180903125300DOI Listing
October 2019

The Mechanism of Exosomes Function in Neurological Diseases: A Progressive Review.

Curr Pharm Des 2018 ;24(24):2855-2861

Key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital Affiliated to Beijing University of Chinese Medicine, Beijing 100700, China.

Exosomes are extracellular microparticles (≈30-100 nm in diameter) secreted from nearly all types of cells, containing a whole set of biological information including proteins, ribonucleic acid (RNA) and lipids. Latest studies show that exosomes contribute to cell-cell communication and are considered closely related with the modulation of angiogenesis and neurogenesis in many neurological diseases. In the past decade, numerous researchers were devoted to exosomes study, but the mechanism of exosomes function and delivery is uncertain. In this review, we summarized several potential mechanisms of exosomes function in angiogenesis, neurogenesis and Blood Brain Barrier (BBB) delivery, and differentiate various sources of exosomes in stroke, tumor, Traumatic Brain Injury (TBI) and Alzheimer's Disease (AD) aimed to report the most advanced mechanical theories in related past three years to provide a new sight for this research area.
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http://dx.doi.org/10.2174/1381612824666180903113136DOI Listing
October 2019
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