01
Sending babies to nursery completely reshapes their microbiomes
送孩子上托儿所会彻底重塑婴儿的微生物群
A recent study published in Nature reveals that infants’ gut microbiomes are significantly shaped by social interactions at nursery, with babies sharing 15–20% of their microbial species after just four months of attendance. Researchers tracked 43 infants over their first year at nursery in Trento, Italy, finding extensive baby-to-baby transmission of gut bacteria that contributed to greater microbial diversity than that acquired from family alone. The study also noted microbial exchange involving siblings, pets, and even nursery staff, while antibiotic use drastically reduced bacterial strains but was followed by rapid recovery. These findings highlight the critical role of early social exposure in developing a diverse, healthy microbiome, with potential long-term health implications yet to be fully understood.
《Nature》杂志最近发表的一项研究揭示，婴儿的肠道微生物群在很大程度上受到托儿所社交互动的影响，婴儿在仅仅入托四个月后，就共享了15-20%的微生物物种。研究人员在意大利特伦托市追踪了43名婴儿入托第一年的情况，发现肠道细菌在婴儿之间存在广泛传播，这比仅从家庭获得的微生物多样性更大。研究还注意到微生物交换涉及兄弟姐妹、宠物甚至托儿所工作人员，而抗生素的使用则大幅减少了细菌菌株，但随后微生物群迅速恢复。这些发现突显了早期社交接触对发展多样化、健康微生物群的关键作用，其对长期健康的影响尚未完全明了。
Source: Nature (https://www.nature.com/articles/d41586-026-00178-8 )
（图片来源：https://e.dxy.cn/wisdom/front/zhihuihao/7955）（如有侵权，请联系删除）
02
Why are girls starting puberty so young?
为什么女孩开始青春期的时间如此之早？
Girls worldwide are beginning puberty at increasingly younger ages, with some starting as early as eight or younger, a trend that has accelerated since the 19th century and possibly intensified during the COVID-19 pandemic. Rising obesity rates are identified as a major driver, alongside suspected but unconfirmed roles of hormone-disrupting chemicals and childhood stress. Early puberty is linked to heightened risks of physical health issues such as obesity, heart disease, and certain cancers, as well as mental health challenges including depression and anxiety. Social consequences also emerge, with early-developing girls, particularly Black and Latinx girls, facing increased discrimination and adultification. Experts emphasize the need for improved education, support systems, and careful medical interventions like puberty blockers to help mitigate psychological and social risks, while ongoing research seeks to clarify causes and guide updated clinical guidelines.
全球范围内，女孩开始青春期的时间越来越早，有些甚至在八岁或更早就开始了。这一趋势自19世纪以来不断加速，并可能在新冠疫情期间加剧。肥胖率上升被认为是主要驱动因素，此外，激素干扰化学物质和童年压力可能也扮演了角色，但尚未证实。青春期过早与一系列身体疾病风险增加相关，如肥胖、心脏病和某些癌症，同时也带来抑郁和焦虑等心理健康挑战。社会影响也随之而来，早发育的女孩，尤其是黑人和拉丁裔女孩，面临更多的歧视和"成人化"对待。专家强调需要改善教育、支持系统，并谨慎使用青春期阻滞剂等医疗干预措施，以帮助减轻心理和社会风险，同时正在进行的研究旨在澄清原因并指导更新临床指南。
Source: Nature (https://www.nature.com/articles/d41586-026-00089-8)
（图片来源：https://www.sohu.com/a/518049260_121124528）（如有侵权，请联系删除）
03
Cancer might protect against Alzheimer’s — this protein helps explain why
癌症可能预防阿尔茨海默病——这种蛋白质有助于解释原因
A new study published in Cell reveals that a protein called cystatin C, produced by cancer cells, can cross the blood-brain barrier in mice and help break down amyloid plaques linked to Alzheimer’s disease. By activating the immune protein TREM2, cystatin C prompts brain immune cells to degrade these plaques, leading to improved cognitive performance in mouse models. This finding offers a potential molecular explanation for the observed inverse relationship between cancer and Alzheimer’s in humans and could pave the way for new therapeutic strategies targeting TREM2 activation, although experts caution that effective treatment will likely require a combination of drugs rather than a single solution.
《Cell》杂志发表的一项新研究揭示，一种由癌细胞产生的名为cystatin C的蛋白质可以在小鼠体内穿过血脑屏障，帮助分解与阿尔茨海默病相关的淀粉样斑块。通过激活免疫蛋白TREM2，cystatin C促使大脑免疫细胞降解这些斑块，从而在小鼠模型中改善认知表现。这一发现为在人类中观察到的癌症与阿尔茨海默病之间的负相关性提供了一个潜在的分子解释，并可能有助于TREM2激活的新治疗策略，尽管专家警告，有效的治疗可能需要联合用药而非单一方案。
Source: Nature (https://www.nature.com/articles/d41586-026-00222-7)
（图片来源：https://www.thepaper.cn/newsDetail_forward_22811045）（如有侵权，请联系删除）
04
Why we must replace temperature limits with clean-energy targets
为什么我们必须用清洁能源目标取代温度限制
As global temperatures surpass the 1.5 °C threshold set by the Paris Agreement, experts argue for shifting focus from temperature limits to accelerating the clean-energy transition. The proposed “clean-energy shift” metric, defined as the growth rate of clean-energy generation minus total energy demand growth, offers a clearer, more actionable measure of climate progress by emphasizing the rapid displacement of fossil fuels. This approach aligns with recent international commitments to expand renewable capacity and aims to reframe climate action as an opportunity for economic growth rather than sacrifice. To support this shift, calls have been made for transparent energy data, revised energy accounting methods, integration of the metric into UN climate processes, and increased investment in clean technology innovation, highlighting a pragmatic path forward despite the unattainability of the original temperature goal.
随着全球气温超过《巴黎协定》设定的1.5°C阈值，专家主张将重点从温度限制转向加速清洁能源转型。提出的"清洁能源转型"指标，定义为清洁能源发电增长率减去总能源需求增长率，通过强调对化石燃料的快速替代，提供了一个更清晰、更具可操作性的气候进展衡量标准。这种方法与近期扩大可再生能源容量的国际承诺一致，旨在将气候行动重新定义为经济增长的机遇而非牺牲。为支持这一转变，已有呼吁要求提高能源数据透明度、修订能源核算方法、将该指标纳入联合国气候进程，并增加清洁技术创新投资。这突显了一条尽管原始温度目标已难以实现，但依然可行的前进之路。
Source: Nature (https://www.nature.com/articles/d41586-026-00246-z)
（图片来源：https://ceep.bit.edu.cn/yjly/qjnyytycjs/）（如有侵权，请联系删除）
05
Damage from a heart attack comes from brain signals, mouse study suggests
小鼠研究表明：心脏病发作后的损伤源于大脑信号
A new study published in Cell reveals that heart damage following a myocardial infarction is worsened by a brain-heart-immune axis involving the vagus nerve. Researchers found that sensory neurons in the vagus nerve relay harmful signals from the injured heart to the brain’s paraventricular nucleus, which then activates sympathetic nerves that increase inflammation and tissue damage in the heart. Blocking this neural pathway in mice reduced heart inflammation, limited tissue damage, and improved recovery, highlighting a critical role of brain signals in heart attack pathology and opening avenues for novel therapies targeting this heart-brain communication.
《Cell》杂志发表的一项新研究揭示，心肌梗死后发生的心脏损伤，因涉及迷走神经的一个"脑-心-免疫轴"而加剧。研究人员发现，迷走神经中的感觉神经元将有害信号从受伤的心脏传递到下丘脑室旁核，后者随后激活交感神经，增加心脏炎症和组织损伤。在小鼠中阻断这一神经通路可以减轻心脏炎症、限制组织损伤并改善恢复，这突显了大脑信号在心脏病发作病理中的关键作用，并为针对这种心脑通讯的新疗法开辟了道路。
Source: Nature
(https://www.nature.com/articles/d41586-026-00261-0)
（图片来源：https://www.smu.edu.cn/info/1241/45009.htm）（如有侵权，请联系删除）