aging

老化
  • 文章类型: Journal Article
    目的:目前关于75岁以下成人心血管事件一级和二级预防的指南已经确立。然而,降脂治疗(LLT)的建议,特别是一级预防,75岁以后都没有定论。在这次审查中,我们关注≥75岁的成年人,以评估低密度脂蛋白胆固醇(LDL-C)作为预测动脉粥样硬化性心血管疾病(ASCVD)风险的标志物,审查风险评估工具,强调LLT的指导方针,讨论好处,风险,和取消处方的策略。
    结果:LDL-C与老年人全因死亡率和心血管结局之间的关系是复杂和混乱的。目前的ASCVD风险估计很大程度上取决于年龄,缺乏老年特异性变量。新兴工具可能会根据生物学而不是实际年龄对个体进行重新分类,冠状动脉钙评分越来越受欢迎。在启动LLT进行一级或二级预防后,缺乏老年人的目标LDL-C水平,和非他汀类药物治疗的阈值仍然未知,依靠年轻人的证据。共同决策至关重要,考虑到治疗的时间受益,预期寿命,不良事件,和老年综合征。建议在临终关怀中停用处方,但在健康或虚弱的老年人中仍不清楚。ASCVD事件后,LLT适合大多数老年人,对于那些接近生命最后几个月的人,可以考虑取消处方。正在进行的试验将指导他汀类药物的处方和无ASCVD的老年人的处方。在此期间,对于无ASCVD且无寿命限制的≥75岁的成年人,LLT方法包括生活方式和药物,特别是他汀类药物,可以在共同决策后考虑。
    OBJECTIVE: Current guidelines for primary and secondary prevention of cardiovascular events in adults up to age 75 years are well-established. However, recommendations for lipid-lowering therapies (LLT), particularly for primary prevention, are inconclusive after age 75. In this review, we focus on adults ≥ 75 years to assess low-density lipoprotein-cholesterol (LDL-C) as a marker for predicting atherosclerotic cardiovascular disease (ASCVD) risk, review risk assessment tools, highlight guidelines for LLT, and discuss benefits, risks, and deprescribing strategies.
    RESULTS: The relationship between LDL-C and all-cause mortality and cardiovascular outcomes in older adults is complex and confounded. Current ASCVD risk estimators heavily depend on age and lack geriatric-specific variables. Emerging tools may reclassify individuals based on biologic rather than chronologic age, with coronary artery calcium scores gaining popularity. After initiating LLT for primary or secondary prevention, target LDL-C levels for older adults are lacking, and non-statin therapy thresholds remain unknown, relying on evidence from younger populations. Shared decision-making is crucial, considering therapy\'s time to benefit, life expectancy, adverse events, and geriatric syndromes. Deprescribing is recommended in end-of-life care but remains unclear in fit or frail older adults. After an ASCVD event, LLT is appropriate for most older adults, and deprescribing can be considered for those approaching the last months of life. Ongoing trials will guide statin prescription and deprescribing among older adults free of ASCVD. In the interim, for adults ≥ 75 years without a limited life expectancy who are free of ASCVD, an LLT approach that includes both lifestyle and medications, specifically statins, may be considered after shared decision-making.
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  • 文章类型: Journal Article
    由于与衰减有关的因素,患有听力损失的老年人可能难以识别噪声中的语音(例如,降低的听觉和感觉水平,SL)和失真(例如,减少时间精细结构,TFS,处理)。此外,当语音和掩蔽器的幅度调制频谱不重叠时,语音识别可以改进。当前的研究通过将幅度调制频谱过滤为语音和语音调制噪声的不同调制速率来对此进行研究。操纵噪声的调制深度以改变语音瞥见的SL。听力正常的年轻人和听力正常或受损的老年人听自然语音或语音编码以降低TFS提示。对照组的年轻人在所有条件下进行了测试,包括频谱形状的语音和阈值匹配噪声,这降低了可听度,以匹配年龄较大的听力受损组。所有组都受益于增加的掩蔽调制深度和音节率语音调制的保留。患有听力损失的老年人在所有情况下都会降低语音识别能力。这可以通过与衰减有关的因素来解释,由于SL减少,和失真,由于减少了TFS处理,这导致掩蔽器浸入时语音提示的听觉处理较差。
    Older adults with hearing loss may experience difficulty recognizing speech in noise due to factors related to attenuation (e.g., reduced audibility and sensation levels, SLs) and distortion (e.g., reduced temporal fine structure, TFS, processing). Furthermore, speech recognition may improve when the amplitude modulation spectrum of the speech and masker are non-overlapping. The current study investigated this by filtering the amplitude modulation spectrum into different modulation rates for speech and speech-modulated noise. The modulation depth of the noise was manipulated to vary the SL of speech glimpses. Younger adults with normal hearing and older adults with normal or impaired hearing listened to natural speech or speech vocoded to degrade TFS cues. Control groups of younger adults were tested on all conditions with spectrally shaped speech and threshold matching noise, which reduced audibility to match that of the older hearing-impaired group. All groups benefitted from increased masker modulation depth and preservation of syllabic-rate speech modulations. Older adults with hearing loss had reduced speech recognition across all conditions. This was explained by factors related to attenuation, due to reduced SLs, and distortion, due to reduced TFS processing, which resulted in poorer auditory processing of speech cues during the dips of the masker.
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  • 文章类型: Journal Article
    背景:肌动蛋白与晶状体混浊有关;然而,与白内障有关的特定肌动蛋白相关途径仍未阐明。在这项研究中,肌动蛋白相关的蛋白质组变化和信号通路参与白内障的发展进行了评估。
    方法:收集11例糖尿病性白内障(DC)患者白内障手术期间前囊和超声乳化(phaco)盒内容物,年龄相关性白内障(ARC)12例,和7例玻璃体切除术后白内障(PVC)患者。无目标,通过具有数据无关采集(DIA)的液相色谱-质谱法对蛋白质进行全局鉴定和定量.
    结果:在phaco盒样本中,ARC中表达明显低于DC和PVC的蛋白质参与各种途径,包括肌动蛋白结合,肌动蛋白细胞骨架重组,肌动蛋白丝封盖,皮质肌动蛋白细胞骨架组织,和小的GTP酶介导的信号转导途径。在前囊中,ARC中表达明显低于DC和PVC的蛋白质参与肌动蛋白结合和肌动蛋白细胞骨架重组途径。
    结论:肌动蛋白细胞骨架和肌动蛋白结合蛋白参与晶状体纤维的伸长和分化。RhoGTPases有助于肌动蛋白细胞骨架重组,它们的失活与晶状体纤维异常迁移有关。这些发现将肌动蛋白结合与晶状体纤维完整性联系起来,晶状体混浊,和白内障。
    BACKGROUND: Actin has been implicated in lens opacification; however, the specific actin-related pathways involved in cataracts remain unelucidated. In this study, actin-related proteome changes and signaling pathways involved in the development of cataracts were evaluated.
    METHODS: The anterior capsule and phacoemulsification (phaco) cassette contents were collected during cataract surgery from 11 patients with diabetic cataract (DC), 12 patients with age-related cataract (ARC), and seven patients with post-vitrectomy cataract (PVC). Untargeted, global identification and quantification of proteins was performed through liquid chromatography-mass spectrometry with the data-independent acquisition (DIA).
    RESULTS: In phaco cassette samples, proteins with significantly lower expression in ARC than in DC and PVC were involved in various pathways, including actin binding, actin cytoskeleton reorganization, actin filament capping, cortical actin cytoskeleton organization, and small GTPase-mediated signal transduction pathways. In anterior capsules, proteins with significantly lower expression in ARC than in DC and PVC were involved in actin binding and actin cytoskeleton reorganization pathways.
    CONCLUSIONS: Actin cytoskeleton and actin-binding proteins are involved in lens fiber elongation and differentiation. Rho GTPases contribute to actin cytoskeletal reorganization, and their inactivation is linked to abnormal lens fiber migration. These findings link actin binding to lens fiber integrity, lens opacification, and cataracts.
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  • 文章类型: Journal Article
    非苯二氮卓催眠药(“Z-药物”)用于治疗失眠,但可能会增加老年人的机动车碰撞(MVC)的风险,通过长时间的嗜睡和延迟的反应时间。我们在序贯目标试验模拟中估计了开始Z-药物治疗对12周MVC风险的影响。在将新泽西州的驾驶执照和警方报告的MVC数据与Medicare索赔联系起来之后,我们每周模拟一项新的目标试验(2007年7月1日-2017年10月7日),其中Medicare按服务付费受益人在基线时被分类为Z-药物治疗或未治疗,并随访MVC.我们使用逆概率治疗和审查加权合并逻辑回归模型来估计风险比(RR)和风险差异与95%自举置信区间(CLs)。共有257,554项个人试验,其中103,371是Z-药物处理的,154,183是未经处理的,产生976个和1,249个MVC,分别。意向治疗RR为1.06(95%CLs0.95,1.16)。对于每个协议的估计,在治疗和未治疗的个人试验中有800个MVCs和1,241个MVCs,分别,提示持续Z-药物治疗降低MVC风险(RR0.83[95%CLs0.74,0.92])。应该明智地向老年患者开Z-药物,但不要因为担心MVC风险而完全保留。
    Non-benzodiazepine hypnotics ( \"Z-drugs\") are prescribed for insomnia, but might increase risk of motor vehicle crash (MVC) among older adults through prolonged drowsiness and delayed reaction times. We estimated the effect of initiating Z-drug treatment on the 12-week risk of MVC in a sequential target trial emulation. After linking New Jersey driver licensing and police-reported MVC data to Medicare claims, we emulated a new target trial each week (July 1, 2007 - October 7, 2017) in which Medicare fee-for-service beneficiaries were classified as Z-drug-treated or untreated at baseline and followed for an MVC. We used inverse probability of treatment and censoring weighted pooled logistic regression models to estimate risk ratios (RR) and risk differences with 95% bootstrap confidence limits (CLs). There were 257,554 person-trials, of which 103,371 were Z-drug-treated and 154,183 untreated, giving rise to 976 and 1,249 MVCs, respectively. The intention-to-treat RR was 1.06 (95%CLs 0.95, 1.16). For the per-protocol estimand, there were 800 MVCs and 1,241 MVCs among treated and untreated person-trials, respectively, suggesting a reduced MVC risk (RR 0.83 [95%CLs 0.74, 0.92]) with sustained Z-drug treatment. Z-drugs should be prescribed to older patients judiciously but not withheld entirely over concerns about MVC risk.
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  • 文章类型: Journal Article
    心理健康(PWB)有助于身体健康。很少有研究考虑性别以及它如何在社会文化背景下影响PWB。这项研究旨在确定社会之间的关系,健康,行为,台湾老年人PWB的社会经济因素受性别影响。
    数据来自2016年台湾心理健康调查。代表性样本,2286人,是使用多级比例概率创建的。参与者在家中使用结构化问卷进行了访谈。纳入标准是台湾公民身份,年龄≥55岁,以及提供知情同意的能力。65岁及以上的参与者被选择为研究样本n=1,533。Ryff的PWB量表的18项版本用于确定PWB。使用中值对低PWB和高PWB进行分类。使用Logistic回归分析来检查按性别分层的PWB的预测因子。
    慢性病,失业,和经济依赖对男性的PWB产生负面影响。对生活环境和家庭关系的满意度对女性的PWB有积极影响。老年男性的独特特征,女人,文化解释了这一点。
    需要针对性别的干预措施,旨在促进老年人的PWB。建议包括教育计划,社会支持研讨会,和社区参与倡议。
    UNASSIGNED: Psychological well-being (PWB) facilitates good health. Few studies have taken into consideration gender and how it can affect PWB within a sociocultural context. This study aims to determine if relationships between social, health, behavioral, and socioeconomic factors on PWB among older Taiwanese adults are affected by gender.
    UNASSIGNED: Data were obtained from the 2016 Taiwan Mental Health Survey. A representative sample, of 2,286 individuals, was created using multistage proportional probability. Participants were interviewed at their homes using a structured questionnaire. Inclusion criteria were Taiwanese citizenship, age ≥ 55 years, and the ability to provide informed consent. Participants 65 years and above were selected for the study sample n = 1,533. An 18-item version of Ryff\'s PWB scale was used to determine PWB. The median value was used to categorize low and high PWB. Logistic regression analyses were used to examine predictors of PWB stratified by gender.
    UNASSIGNED: Chronic disease, unemployment, and financial dependence negatively impacted men\'s PWB. Satisfaction with living environment and family relationships positively impacted women\'s PWB. Unique characteristics of older men, women, and culture account for this.
    UNASSIGNED: Gender-specific interventions aimed at promoting PWB in older adults are needed. Recommendations include educational programs, social support workshops, and community engagement initiatives.
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  • 文章类型: Journal Article
    研究表明,基于性别和性取向的性交性高潮率存在显着差异;但是,这种“性高潮差距”还没有关于年龄的研究。
    该研究试图按性别和性取向检查性交的性高潮率与年龄相关的差异。
    来自美国的24752名成年人的调查样本,年龄从18岁到100岁不等。数据是在2015年至2023年之间的8个横断面调查中收集的。
    参与者报告了他们在性交过程中的平均性高潮率,从0%到100%。
    性高潮率与年龄有关,但影响最小。在所有年龄组中,男性报告性高潮率高于女性。男性的性高潮率从70%到85%不等,而女性的比例从46%到58%不等。男性报告的性高潮率比女性高22%至30%。性取向按性别影响性高潮率,但在各年龄组中并不一致。
    性高潮差距的持续存在需要在临床实践和教育中采取量身定制的方法,专注于包容性的性健康讨论,解决性少数群体和老龄化的独特挑战,强调相互满足,以促进所有人的性福祉。
    这项研究首次考察了性高潮与年龄之间的差距,在一个大的,多样的样本。调查结果受到方法论的限制,包括对性高潮的单项评估和单身成年人的样本。
    这项研究揭示了性交导致性高潮率的持久差异,可能是由许多因素造成的,包括社会文化规范和性教育不足。
    UNASSIGNED: Research demonstrates significant gender- and sexual orientation-based differences in orgasm rates from sexual intercourse; however, this \"orgasm gap\" has not been studied with respect to age.
    UNASSIGNED: The study sought to examine age-related disparities in orgasm rates from sexual intercourse by gender and sexual orientation.
    UNASSIGNED: A survey sample of 24 752 adults from the United States, ranging in age from 18 to 100 years. Data were collected across 8 cross-sectional surveys between 2015 and 2023.
    UNASSIGNED: Participants reported their average rate of orgasm during sexual intercourse, from 0% to 100%.
    UNASSIGNED: Orgasm rate was associated with age but with minimal effect size. In all age groups, men reported higher rates of orgasm than did women. Men\'s orgasm rates ranged from 70% to 85%, while women\'s ranged from 46% to 58%. Men reported orgasm rates between 22% and 30% higher than women\'s rates. Sexual orientation impacted orgasm rates by gender but not uniformly across age groups.
    UNASSIGNED: The persistence of the orgasm gap across ages necessitates a tailored approach in clinical practice and education, focusing on inclusive sexual health discussions, addressing the unique challenges of sexual minorities and aging, and emphasizing mutual satisfaction to promote sexual well-being for all.
    UNASSIGNED: This study is the first to examine the orgasm gap with respect to age, and does so in a large, diverse sample. Findings are limited by methodology, including single-item assessments of orgasm and a sample of single adults.
    UNASSIGNED: This study revealed enduring disparities in orgasm rates from sexual intercourse, likely resulting from many factors, including sociocultural norms and inadequate sex education.
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  • 文章类型: Journal Article
    目的:本研究的目的是研究表面处理的效果,液体,和颜色的老化,半透明,整体陶瓷的表面性能。
    方法:将二硅酸锂(LDS)和氧化锆增强的硅酸锂(ZLS)陶瓷(各n=135)切割并分为三组[结晶釉(单级),结晶釉(两个阶段),和结晶抛光(两个阶段)]。使用扫描电子显微镜(SEM)检查来自每组的一个样品。其余样本分为四个亚组(蒸馏水,咖啡,葡萄汁,和冰沙)(每个n=11),在各自的液体中储存12天,热老化。使用SEM分析来自每个亚组的一个样品。颜色,光泽,在表面处理(初始)和在不同液体老化条件下储存后,分析了样品的粗糙度值。使用稳健的双向和三向方差分析来分析初始数据以及老化数据和数据变化值。
    结果:上釉组表现出更光滑的表面。陶瓷类型和陶瓷-表面处理相互作用影响初始半透明参数(TP)(P<.001)以及初始和老化粗糙度值(P≤.001)。表面处理类型影响颜色变化(P<.001),和陶瓷类型影响老化TP值(P<.001)。陶瓷类型,表面处理,并且它们的相互作用影响初始和老化光泽(P≤.001)和TP变化值(P≤.015)。表面处理类型和陶瓷-表面处理相互作用影响光泽变化值(P≤.001)。
    结论:虽然陶瓷和所有表面处理都适用于临床,推荐结晶釉。当光泽和光滑度很重要或半透明很重要时,ZLS或LDS可能是优选的,分别。
    OBJECTIVE: The purpose of this study was to investigate the effects of surface treatments, liquids, and aging on color, translucency, and surface properties of monolithic ceramics.
    METHODS: Lithium disilicate (LDS) and zirconia-reinforced lithium silicate (ZLS) ceramics (n = 135 each) were cut and divided into three groups [crystallization+glaze (single stage), crystallization-glaze (two stages), and crystallization-polish (two stages)]. One sample from each group was examined using scanning electron microscopy (SEM). Remaining samples were divided into four subgroups (distilled water, coffee, grape juice, and smoothie) (n = 11 each), stored for 12 d in the respective liquids, and thermally aged. One sample from each subgroup was analyzed using SEM. The color, gloss, and roughness values of the samples were analyzed after surface treatment (initial) and storage under different liquids+aging conditions. The initial data and both the aged data and data change values were analyzed using robust two- and three-way analyses of variance.
    RESULTS: The glazed groups exhibited smoother surfaces. Ceramic type and ceramic-surface treatment interactions affected the initial translucency parameter (TP) (P < .001) and the initial and aged roughness values (P ≤ .001). Surface treatment type affected the color change (P < .001), and ceramic type affected the aged TP values (P < .001). Type of ceramic, surface treatment, and their interactions affected both the initial and aged gloss (P ≤ .001) and TP change values (P ≤ .015). Surface treatment type and ceramic-surface treatment interactions affected the gloss change values (P ≤ .001).
    CONCLUSIONS: Although both ceramics and all surface treatments are clinically applicable, crystallization-glaze is recommended. When gloss and smoothness are important or when translucency is important, ZLS or LDS may be preferred, respectively.
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  • 文章类型: Journal Article
    背景:痴呆是一种隐匿的认知障碍,其特征是认知能力下降,无法通过衰老的生理学很好地解释。痴呆症包括一组以认知和执行日常功能的能力逐渐丧失为特征的疾病。
    方法:我们在全印度医学科学研究所周围地区的384名老年参与者中进行了一项横断面研究。Bibinagar,Telangana,印度。65岁以上的人被纳入研究,那些患有严重疾病的人被排除在外。蒙特利尔认知评估(MOCA)量表,加州大学洛杉矶分校(UCLA)孤独量表,和患者健康问卷(PHQ-9)用于评估认知状态,孤独,和抑郁症,分别,在研究参与者中。进行Logistic回归以确定与认知障碍(CI)相关的因素,抑郁症,和孤独。
    结果:研究参与者的平均MOCA评分为14.9±6.9,28.6%的参与者表现出严重的CI。近一半的参与者(49.2%)经历了中等到高度的孤独感,39.3%出现中度至重度抑郁症。发现与严重CI相关的重要因素是文盲(校正比值比(AOR):2.85,95%CI:1.35-4.45),城市住宅(AOR:0.18,95%CI:0.04-0.81),与配偶生活在一起(AOR:0.23,95%CI:0.11-0.78),不饮酒(AOR:0.35,95%CI:0.14-0.87),和抑郁(AOR:4.49,95%CI:1.37-14.67)。
    结论:CI在印度是一个严重的公共卫生问题。随着近期老年人口比例的增加,CI水平会增加,尤其是像印度这样的国家。及时的干预措施,例如通过社区筛查进行早期识别,将老年健康部分纳入初级保健,适当的咨询将有助于在基层解决这个问题。
    BACKGROUND: Dementia is an insidious cognitive disorder featuring a decline in cognition that is not well explained by the physiology of aging. Dementia includes a group of disorders that are distinguished by a gradual loss of both cognition and the capability to execute day-to-day functions.
    METHODS: We conducted a cross-sectional study among 384 elderly participants in areas surrounding the All India Institute of Medical Sciences, Bibinagar, Telangana, India. Those with more than 65 years of age were included in the study, and those suffering from serious illnesses were excluded. The Montreal Cognitive Assessment (MOCA) scale, the University of California and Los Angeles (UCLA) Loneliness Scale, and the Patient Health Questionnaire (PHQ-9) were used to assess cognitive status, loneliness, and depression, respectively, among the study participants. Logistic regression was performed to identify factors associated with cognitive impairment (CI), depression, and loneliness.
    RESULTS: The average MOCA score of the study participants was 14.9 ± 6.9, with 28.6% of the participants exhibiting severe CI. Nearly half of the participants (49.2%) experienced moderate to high degrees of loneliness, and 39.3% experienced moderate to severe depression. Important factors found to be associated with severe CI were illiteracy (adjusted odds ratio (AOR): 2.85, 95% CI: 1.35-4.45), urban residence (AOR: 0.18, 95% CI: 0.04-0.81), living with a spouse (AOR: 0.23, 95% CI: 0.11-0.78), not consuming alcohol (AOR: 0.35, 95% CI: 0.14-0.87), and depression (AOR: 4.49, 95% CI: 1.37-14.67).
    CONCLUSIONS: CI is a serious public health problem in India. With the increasing proportion of the elderly population in the near future, CI levels will increase, especially in countries like India. Timely interventions such as early identification through community-based screening, the inclusion of a geriatric health component in primary health care, and proper counseling will help address this problem at a grassroots level.
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  • 文章类型: Journal Article
    该研究旨在了解老年人照顾者的主要技能,并找到提高这些技能的方法。我们使用随机整群抽样的方法选择参与者,选择了来自杭州七个地区的17个不同医疗和护理机构的护理人员。我们收集了492份有效问卷,并对150人进行了访谈。为了分析数据,我们使用T检验和方差分析(ANOVA)来确定哪些因素会影响护理人员的技能.我们还进行了多元回归分析,以更深入地探讨这些因素。分析表明,年龄(p=0.041),年收入(p<0.001),并且具有培训证书(p<0.001)显着影响老年人护理人员的技能。具体来说,照顾者的年龄和他们是否有培训证书与他们的能力有关,收入是一个非常重要的因素。该研究强调了护理人员当前技能与高质量护理所需技能之间的差距。这一差距表明需要专门针对护理人员的不同需求和文化背景进行培训。医疗和老年护理机构应相应调整其工作和教育计划。同样重要的是要看看护理人员是如何得到报酬的,以确保他们的工资反映了他们的技能和他们提供的护理质量。最后,它的关键是整合一个全面的培训计划,导致认证在老年保健组织。
    The study aimed to understand the main skills of older adult caregivers and find ways to improve these skills. We selected participants using a method called random cluster sampling, where caregivers from 17 different medical and nursing care facilities across seven districts in Hangzhou were chosen. We collected 492 valid questionnaires and conducted interviews with 150 people. To analyze the data, we used T-tests and Analysis of Variance (ANOVA) to identify what factors affect caregivers\' skills. We also performed multiple regression analysis to explore these factors in more depth. The analysis showed that age (p = 0.041), annual income (p < 0.001), and having a training certificate (p < 0.001) significantly influence the skills of older adult caregivers. Specifically, caregivers\' age and whether they had a training certificate were linked to how competent they were, with income being a very strong factor. The study highlighted a gap between the caregivers\' current skills and the skills needed for high-quality care. This gap shows the need for training programs that are specifically tailored to the caregivers\' diverse needs and cultural backgrounds. Medical and eldercare facilities should adjust their work and educational programs accordingly. It\'s also important to look at how caregivers are paid to make sure their salary reflects their skills and the quality of care they provide. Finally, it\'s crucial to integrate a comprehensive training program that leads to certification within eldercare organizations.
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  • 文章类型: Journal Article
    背景:在细胞水平上抑制或减缓衰老标志已被提出作为增加机体寿命和健康跨度的途径。因此,人们对抗衰老药物的发现非常感兴趣。然而,这目前需要费力和冗长的寿命分析。这里,我们提出了一种新的筛选读数,用于快速发现抑制体外细胞群老化并延长体内寿命的化合物。
    方法:使用Illumina甲基化阵列,我们监测了随培养的成人原代细胞长期传代而发生的DNA甲基化变化.这使我们能够发展,test,并验证CellPopAge时钟,带有底层算法的表观遗传时钟,在现有的表观遗传时钟中,其设计用于检测体外抗衰老化合物。此外,我们测量了衰老的标志物,并在果蝇体内进行了长寿实验,进一步验证我们发现新型抗衰老化合物的方法。最后,我们将我们的表观遗传时钟与其他可用的表观遗传时钟进行基准标记,以巩固其对培养中原代细胞的有用性和专业化。
    结果:我们开发了一种新的表观遗传时钟,CellPopAge时钟,准确监测成人原代细胞群的年龄。我们发现CellPopAgeClock可以检测用雷帕霉素或曲美替尼处理的人原代细胞的基于传代的老化速度,成熟的长寿药。然后,我们利用CellPopAge时钟作为筛选工具,用于鉴定减缓细胞群体衰老的化合物,发现新型抗衰老药物,torin2和dactolisib(BEZ-235)。我们证明,用抗衰老化合物处理的人类原代细胞的表观遗传衰老伴随着衰老和衰老生物标志物的减少。最后,我们通过利用特殊配方的碱性介质来增加果蝇的药物生物利用度,从而在体内扩展了我们的筛选平台。我们证明了新型抗衰老药物,torin2和dactolisib(BEZ-235),增加体内寿命。
    结论:我们的方法将CpG甲基化分析的范围扩大到在体外使用人细胞准确、快速地检测药物的抗衰老潜力,在体内,提供了一个新颖的加速发现平台,以测试所寻求的抗衰老化合物和老虎机。
    BACKGROUND: Restraining or slowing ageing hallmarks at the cellular level have been proposed as a route to increased organismal lifespan and healthspan. Consequently, there is great interest in anti-ageing drug discovery. However, this currently requires laborious and lengthy longevity analysis. Here, we present a novel screening readout for the expedited discovery of compounds that restrain ageing of cell populations in vitro and enable extension of in vivo lifespan.
    METHODS: Using Illumina methylation arrays, we monitored DNA methylation changes accompanying long-term passaging of adult primary human cells in culture. This enabled us to develop, test, and validate the CellPopAge Clock, an epigenetic clock with underlying algorithm, unique among existing epigenetic clocks for its design to detect anti-ageing compounds in vitro. Additionally, we measured markers of senescence and performed longevity experiments in vivo in Drosophila, to further validate our approach to discover novel anti-ageing compounds. Finally, we bench mark our epigenetic clock with other available epigenetic clocks to consolidate its usefulness and specialisation for primary cells in culture.
    RESULTS: We developed a novel epigenetic clock, the CellPopAge Clock, to accurately monitor the age of a population of adult human primary cells. We find that the CellPopAge Clock can detect decelerated passage-based ageing of human primary cells treated with rapamycin or trametinib, well-established longevity drugs. We then utilise the CellPopAge Clock as a screening tool for the identification of compounds which decelerate ageing of cell populations, uncovering novel anti-ageing drugs, torin2 and dactolisib (BEZ-235). We demonstrate that delayed epigenetic ageing in human primary cells treated with anti-ageing compounds is accompanied by a reduction in senescence and ageing biomarkers. Finally, we extend our screening platform in vivo by taking advantage of a specially formulated holidic medium for increased drug bioavailability in Drosophila. We show that the novel anti-ageing drugs, torin2 and dactolisib (BEZ-235), increase longevity in vivo.
    CONCLUSIONS: Our method expands the scope of CpG methylation profiling to accurately and rapidly detecting anti-ageing potential of drugs using human cells in vitro, and in vivo, providing a novel accelerated discovery platform to test sought after anti-ageing compounds and geroprotectors.
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