妊娠期体育锻炼干预对自然分娩影响的Meta分析

背景 自然分娩是人类繁衍的正常生理过程，中国剖宫产率超出了世界卫生组织（WHO）提出的警戒线2倍多，而体育锻炼作为一种非药物性的健康干预方式，应引起相关部门的重视。 目的 运用Meta分析方法检验妊娠期体育锻炼对自然分娩影响的干预效果，并提出最优的锻炼方案。 方法 检索中国知网（CNKI）、中国生物医学文献服务系统（CBM）、维普网中文数据库和PubMed、EMBase、Web of Science、Cochrane Library英文数据库中有关妊娠期体育锻炼干预影响自然分娩结果的随机对照试验（其中干预组以体育锻炼干预为唯一干预方式，对照组进行常规护理知识教育或不进行有规律的体育锻炼），同时追踪相关系统评价所引用的参考文献，检索时间为1990—2021年。提取纳入文献资料，并对纳入文献进行方法学质量评价，采用RevMan 5.2软件进行Meta分析，运用GRADE工具对结局指标进行质量评价。 结果 共纳入30篇文献。Meta分析结果显示，干预组自然分娩发生率高于对照组〔RR=1.34，95%CI（1.28，1.40），P<0.000 01〕。亚组分析结果显示，锻炼开始节点对自然分娩的干预效果从高到低依次为：>24周、13~24周、≤12周；锻炼内容对自然分娩的干预效果从高到低依次为：盆底肌训练、运动课、体操、有氧运动、分娩球、瑜伽；锻炼频率对自然分娩的干预效果从高到低依次为：≥12次/周、3~5次/周、6~8次/周、9~11次/周；中等强度的锻炼较低强度的锻炼对自然分娩具有更大的影响；锻炼时长对自然分娩的干预效果从高到低依次为：30~<50 min/次、<30 min/次、≥50 min/次；锻炼周期对自然分娩的干预效果从高到低依次为：≤8周、17~24周、9~16周、25~34周。绘制体育锻炼干预对孕妇自然分娩影响的漏斗图，结果显示，漏斗图左右两侧基本对称，发表偏倚较小。运用GRADE工具对结局指标进行质量评价，结果显示，妊娠期体育锻炼影响自然分娩的评级为中等级。 结论 孕妇在妊娠期进行一定的体育锻炼对自然分娩结果具有良好的干预效果，且从妊娠期>24周开始锻炼、≥12次/周、30~<50 min/次、持续进行≤8周的中等强度的盆底肌训练、运动课、体操、有氧运动、分娩球以及瑜伽均对孕妇自然分娩的选择具有积极的影响。     

Machine learning to identify immune-related biomarkers of rheumatoid arthritis based on WGCNA network

Clinical Rheumatology - This study was designed to identify the potential diagnostic biomarkers of rheumatoid arthritis (RA) and to explore the potential pathological relevance of immune cell...     

Phoenixin-20 ameliorates brain infarction by promoting microglia M2 polarization in an ischemic stroke model

Metabolic Brain Disease - Ischemic stroke is one of the most common causes of death worldwide. The transformation of microglia from the classic M1 to the alternative M2 state has been shown to have...     

In vivo quantitative analysis of anterior chamber white blood cell mixture composition using spectroscopic optical coherence tomography

Anterior uveitis is the most common form of intraocular inflammation, and one of its main signs is the presence of white blood cells (WBCs) in the anterior chamber (AC). Clinically, the true composition of cells can currently only be obtained using AC paracentesis, an invasive procedure to obtain AC fluid requiring needle insertion into the AC. We previously developed a spectroscopic optical coherence tomography (SOCT) analysis method to differentiate between populations of RBCs and subtypes of WBCs, including granulocytes, lymphocytes and monocytes, both in vitro and in ACs of excised porcine eyes. We have shown that different types of WBCs have distinct characteristic size distributions, extracted from the backscattered reflectance spectrum of individual cells using Mie theory. Here, we further develop our method to estimate the composition of blood cell mixtures, both in vitro and in vivo. To do so, we estimate the size distribution of unknown cell mixtures by fitting the distribution observed using SOCT with a weighted combination of reference size distributions of each WBC type calculated using kernel density estimation. We validate the accuracy of our estimation in an in vitro study, by comparing our results for a given WBC sample mixture with the cellular concentrations measured by a hemocytometer and SOCT images before mixing. We also conducted a small in vivo quantitative cell mixture validation pilot study which demonstrates congruence between our method and AC paracentesis in two patients with uveitis. The SOCT based method appears promising to provide quantitative diagnostic information of cellular responses in the ACs of patients with uveitis.     

Plasmodium vivax Pre-Erythrocytic-Stage Antigen Discovery: Exploiting Naturally Acquired Humoral Responses

Abstract. The development of pre-erythrocytic Plasmodium vivax vaccines is hindered by the lack of in vitro culture systems or experimental rodent models. To help bypass these roadblocks, we exploited the fact that naturally exposed Fy- individuals who lack the Duffy blood antigen (Fy) receptor are less likely to develop blood-stage infections; therefore, they preferentially develop immune responses to pre-erythrocytic-stage parasites, whereas Fy+ individuals experience both liver- and blood-stage infections and develop immune responses to both pre-erythrocytic and erythrocytic parasites. We screened 60 endemic sera from P. vivax-exposed Fy+ or Fy- donors against a protein microarray containing 91 P. vivax proteins with P. falciparum orthologs that were up-regulated in sporozoites. Antibodies against 10 P. vivax antigens were identified in sera from P. vivax-exposed individuals but not unexposed controls. This technology has promising implications in the discovery of potential vaccine candidates against P. vivax malaria.     

The prevalence of colistin resistance in Escherichia coli and Klebsiella pneumoniae isolated from food animals in China: coexistence of mcr-1 and blaNDM with low fitness cost

Increasing colistin resistance is a global concern because colistin is used as a last resort for the treatment of carbapenem-resistant Enterobacteriaceae infections. The plasmid-mediated colistin resistance gene, mcr-1 was found in distinct bacterial species isolated from humans, animals, and the environment. In this study, farms in four different agricultural provinces in China were investigated to determine the occurrence of the antimicrobial resistance and related genes. A total of 373 Escherichia coli and 54 Klebsiella pneumoniae were isolated from 510 non-duplicated samples. Of the E. coli and K. pneumoniae isolates, 72.7% and 66.7%, respectively, were susceptible to colistin. Isolates resistant to colistin comprised 46.6% of the samples isolated from Shandong, and 17.8% and 16.4% of the samples from Jilin and Henan, respectively. Twenty-six carbapenem-resistant E. coli isolates were resistant to colistin, in which both mcr-1 and bla_NDM were present. Specifically, the co-existence was found in isolates from animals and sewage. Most of the resistance genes were located on plasmids and were 40–244 kilobases. Growth curves of transconjugants carrying mcr-1, bla_NDM-1, bla_NDM-4, bla_NDM-5, and bla_NDM-9 showed a low fitness cost compared with the recipient. In conclusion, mcr-1 was widespread in E. coli and K. pneumoniae isolated from farms in China. Co-existence of mcr-1 and bla_NDM-9 was identified in different sequence types of E. coli with low fitness cost from various origins, indicating an urgent need to take measures for decreasing dissemination.     

Immunization with genetically attenuated P. falciparum parasites induces long-lived antibodies that efficiently block hepatocyte invasion by sporozoites

Whole-parasite malaria vaccines have shown promise in clinical trials. We recently reported the first human trial of a malaria vaccine based on Plasmodium falciparum genetically attenuated parasites (PfGAP). Herein we report for the first time that PfGAP induces prolonged functional humoral responses in humans. Six volunteers were exposed to 5 bites of PfGAP-infected mosquitoes followed by approximately 200 bites. Plasma collected from all volunteers 3 months after the last exposure efficiently inhibits invasion of hepatocytes by P. falciparum sporozoites. The level of inhibition observed is comparable to that attained using plasma collected after 4–5 intravenously administrations of high numbers of irradiated sporozoites, validating the potential of PfGAP malaria vaccines. Our data highlight the role of antibody responses in pre-erythrocytic stages of human malaria, and suggests that to be protective, malaria vaccines might need to elicit long-lasting functional antibodies in addition to cellular responses.     

Differential T-cell responses of semi-immune and susceptible malaria subjects to in silico predicted and synthetic peptides of Plasmodium falciparum

Malaria remains a public health hazard in tropical countries as a consequence of the rise and spread of drug and insecticide resistances; hence the need for a vaccine with widespread application. Protective immunity to malaria is known to be mediated by both antibody and cellular immune responses, though characterization of the latter has been less extensive. The aim of the present investigation was to identify novel T-cell epitopes that may contribute to naturally acquired immune responses against malaria. Using the Microsoft software, Epitome™ T-cell peptide epitopes on 19 Plasmodium falciparum proteins in the Plasmodium Database (www.plasmodb.org.PlasmoDB 9.0) were predicted in-silico. The peptides were synthesized and used to stimulate peripheral blood mononuclear cells (PBMCs) in 14 semi-immune and 21 malaria susceptible subjects for interferon-gamma (IFN-γ) production ex-vivo. The level of IFN-γ production, a marker of T-cell responses, was measured by ELISPOT assay in semi-immune subjects (SIS) and frequently sick subjects (FSS) from an endemic zone with perennial malaria transmission. Of the 19 proteins studied, 17 yielded 27 pools (189 peptides), which were reactive with the subjects’ PBMCs when tested for IFN-γ production, taking a stimulation index (SI) of ≥2 as a cutoff point for a positive response. There were 10 reactive peptide pools (constituting eight protein loci) with an SI of 10 or greater. Of the 19 proteins studied, two were known vaccine candidates (MSP-8 and SSP2/TRAP), which reacted both with SIS and FSS. Similarly the hypothetical proteins (PFF1030w, PFE0795c, PFD0880w, PFC0065c and PF10_0052) also reacted strongly with both SIS and FSS making them attractive for further characterization as mediators of protective immunity and/or pathogenesis.