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CLN3 clinches lysosomes in clearance of glycerophospholipids CLN3结合溶酶体清除甘油磷脂
Pub Date : 2022-10-19 DOI: 10.1093/lifemeta/loac029
Guang Lu, Han-Ming Shen
CLN3 is a lysosomal transmembrane protein and loss of CLN3 mutation is known to cause a juvenile lethal neurodegenerative lysosomal storage disorder (LSD), called Batten disease. In a recent study published in Nature, Laqtom et al. reported a novel function of CLN3 in the clearance of glycerophospholipid from lysosomes via lysosomal efflux of glycerophosphodiesters (GPDs), not only establishing a deeper mechanistic understanding of Batten disease, also suggesting both the diagnostic and therapeutic potential of CLN3-GPDs in this type of neurodegenerative LSD.
CLN3是一种溶酶体跨膜蛋白,已知CLN3突变的缺失会导致一种幼年致死性神经退行性溶酶体储存障碍(LSD),称为Batten病。在最近发表在《自然》杂志上的一项研究中,Laqtom等人报道了CLN3通过甘油二酯(GPD)的溶酶体外排清除溶酶体中甘油磷脂的新功能,不仅建立了对Batten病更深入的机制理解,还表明了CLN3-GPD在这类神经退行性LSD中的诊断和治疗潜力。
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引用次数: 0
WTAP Regulates Postnatal Development of Brown Adipose Tissue by stabilizing METTL3 in mice WTAP通过稳定METTL3调节小鼠出生后棕色脂肪组织的发育
Pub Date : 2022-10-10 DOI: 10.1093/lifemeta/loac028
Yuqin Wang, Xinzhi Li, Cenxi Liu, Liying Zhou, Lei Shi, Zhiguo Zhang, Long Chen, Ming Gao, Lanyue Gao, Yuanyuan Xu, He Huang, Jin Li, Zheng Chen
Brown adipocyte maturation during postnatal development is essential for brown adipose tissue (BAT) to protect animals against cold. Impaired maturation of brown adipocytes leads to cold intolerance. However, the molecular mechanisms that determines maturation of brown adipocytes during postnatal development are not fully understood. Here we identify Wilms’ tumor 1-associating protein (WTAP) as an essential regulator in the postnatal development and maturation of BAT. BAT-specific knockout of Wtap (Wtap-BKO) severely impairs maturation of BAT in vivo by decreasing the expression of BAT-selective genes, leading to whitening of interscapular BAT (iBAT). Single nucleus RNA-sequencing analysis shows the dynamic changes of cell heterogeneity in iBAT of Wtap-BKO mice. Adult mice with WTAP deficiency in BAT display hypothermic and succumb to acute cold challenge. Mechanistically, WTAP deficiency decreases m 6A mRNA modification by reducing the protein stability of METTL3. BAT-specific overexpression of Mettl3 partially rescues the phenotypes observed in Wtap-BKO mice. These data demonstrate that WTAP/METTL3 plays an essential role in iBAT postnatal development and thermogenesis.
出生后发育过程中棕色脂肪细胞的成熟对于棕色脂肪组织(BAT)保护动物抵御寒冷至关重要。棕色脂肪细胞成熟受损导致冷不耐受。然而,在出生后发育过程中决定棕色脂肪细胞成熟的分子机制尚不完全清楚。本研究发现,Wilms ' tumor 1- associated protein (WTAP)是出生后BAT发育和成熟的重要调节因子。BAT特异性敲除Wtap (Wtap- bko)通过降低BAT选择基因的表达严重损害BAT在体内的成熟,导致肩关节间BAT (iBAT)变白。单核rna测序分析显示Wtap-BKO小鼠iBAT细胞异质性的动态变化。在BAT中缺乏WTAP的成年小鼠表现为体温过低,并屈服于急性冷挑战。机制上,WTAP缺乏通过降低METTL3蛋白的稳定性来降低m6a mRNA的修饰。在Wtap-BKO小鼠中观察到,bat特异性过表达Mettl3部分地挽救了表型。这些数据表明,WTAP/METTL3在iBAT出生后发育和产热过程中起着重要作用。
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引用次数: 7
Inhibiting lysosomal aldolase: a magic bullet for AMPK activation in treating metabolic disease? 抑制溶酶体醛缩酶:AMPK激活治疗代谢性疾病的灵丹妙药?
Pub Date : 2022-10-10 DOI: 10.1093/lifemeta/loac027
D. Carling
In a tour-de-force study by Zhang and colleagues recently published in Nature Metabolism, a newly identified aldolase inhibitor, Aldometanib, is shown to activate lysosomal AMPK. Remarkably, mice treated with Aldometanib have increased insulin sensitivity, lowered blood glucose, decreased hepatic steatosis and fibrosis and are long-lived, effects of which all appear to be mediated via activation of lysosomal AMPK.
在张及其同事最近发表在《自然代谢》杂志上的一项巡回研究中,一种新发现的醛缩酶抑制剂Aldometanib被证明可以激活溶酶体AMPK。值得注意的是,接受羟甲基胺治疗的小鼠胰岛素敏感性增加,血糖降低,肝脂肪变性和纤维化减少,并且寿命长,其作用似乎都是通过溶酶体AMPK的激活介导的。
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引用次数: 0
Sirtuins are Not Conserved Longevity Genes. Sirtuins不是保守的长寿基因。
Pub Date : 2022-10-01 DOI: 10.1093/lifemeta/loac025
Charles Brenner

It is central to biology that sequence conservation suggests functional conservation. Animal longevity is an emergent property of selected traits that integrates capacities to perform physical and mental functions after reproductive maturity. Though the yeast SIR2 gene was nominated as a longevity gene based on extended replicative longevity of old mother cells, this is not a selected trait: SIR2 is selected against in chronological aging and the direct targets of SIR2 in replicative lifespan are not conserved. Though it would be difficult to imagine how a gene that advantages 1 in 5 million yeast cells could have anticipated causes of aging in animals, overexpression of SIR2 homologs was tested in invertebrates for longevity. Because artifactual positive results were reported years before they were sorted out and because it was not known that SIR2 functions as a pro-aging gene in yeast chronological aging and in flies subject to amino acid deprivation, a global pursuit of longevity phenotypes was driven by a mixture of framing bias, confirmation bias and hype. Review articles that propagate these biases are so rampant that few investigators have considered how weak the case ever was for sirtuins as longevity genes. Acknowledging that a few positive associations between sirtuins and longevity have been identified after thousands of person-years and billions of dollars of effort, we review the data and suggest rejection of the notions that sirtuins 1) have any specific connection to lifespan in animals and 2) are primary mediators of the beneficial effects of NAD repletion.

序列保守意味着功能保守,这是生物学的核心。动物的长寿是一种选择特性的涌现性,它综合了生殖成熟后执行身体和心理功能的能力。虽然酵母SIR2基因被提名为长寿基因,是基于年老母细胞复制寿命的延长,但这并不是一个被选择的性状:SIR2是在时间衰老中被选择的,SIR2在复制寿命中的直接靶点并不保守。尽管很难想象一个在500万个酵母细胞中占1个优势的基因是如何预测动物衰老的原因的,但在无脊椎动物中对SIR2同源物的过度表达进行了长寿测试。由于人为的阳性结果在它们被整理出来之前的几年就被报道过,而且由于不知道SIR2在酵母的时间衰老和氨基酸剥夺的果蝇中作为促衰老基因起作用,因此全球对长寿表型的追求是由框架偏见、确认偏见和炒作的混合驱动的。传播这些偏见的评论文章如此猖獗,以至于很少有研究人员考虑到sirtuins作为长寿基因的证据是多么薄弱。我们承认,经过数千人年和数十亿美元的努力,已经确定了sirtuins与寿命之间的一些积极联系,我们回顾了这些数据,并建议拒绝sirtuins与动物寿命有任何特定联系以及2)是NAD补充有益作用的主要介质的概念。
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引用次数: 6
AKG/OXGR1 promotes skeletal muscle blood flow and metabolism by relaxing vascular smooth muscle AKG/OXGR1通过放松血管平滑肌促进骨骼肌血液流动和代谢
Pub Date : 2022-09-29 DOI: 10.1093/lifemeta/loac026
Jinping Yang, Guli Xu, Yiming Xu, Pei Luo, Yexian Yuan, Lin Yao, Jingjing Zhou, Yunlong Zhu, Ishwari Gyawali, Chang Xu, Jinlong Feng, Zewei Ma, Yuxian Zeng, Songbo Wang, P. Gao, Canjun Zhu, Q. Jiang, G. Shu
In response to contraction during exercise, skeletal muscle growth and metabolism are dynamically regulated by nerve action, blood flow and metabolic feedback. α-ketoglutarate (AKG), a bioactive intermediate in the tricarboxylic acid cycle released during exercise, has been shown to promote skeletal muscle hypertrophy. However, the underlying mechanism of AKG in regulating skeletal muscle development and metabolism is still less known. 2-Oxoglutarate receptor 1 (OXGR1), the endogenous AKG receptor, is found to be distributed in the vascular smooth muscle (VSM) of skeletal muscles. OXGR1 knockout results in skeletal muscle atrophy, accompanied by decreased expression of myosin heavy chain I (MyHC I), capillary density, and endurance exercise capacity. Furthermore, the study found that dietary AKG supplementation increased mice endurance exercise distance, MyHC I/MyHC IIb ratio, arteriole and capillary densities in skeletal muscle. Meanwhile, acute AKG administration gradually increased the blood flow in the lower limbs. Further, by using OXGR1 global knock-out and OXGR1 VSM specific (MYH11-Cre × OXGR1-FloxP) knockdown models, we found that OXGR1 in VSM is essential for AKG-induced improvement of skeletal muscle performances. According to the in vitro study, AKG expanded the cell area in VSM with a decreased intracellular pH (pHi) by OXGR1. Our results demonstrated a novel role of AKG/OXGR1 in VSM of skeletal muscle to regulate blood flow and then enhance slow muscle fiber conversion and capillarization. These findings provide a theoretical basis for the AKG/OXGR1 signaling pathway to maintain human muscle function and improve meat production and livestock and poultry meat quality.
为了应对运动中的收缩,骨骼肌的生长和代谢受到神经作用、血流和代谢反馈的动态调节。α-酮戊二酸(AKG)是运动过程中释放的三羧酸循环中的一种生物活性中间体,已被证明可促进骨骼肌肥大。然而,AKG调节骨骼肌发育和代谢的潜在机制尚不清楚。2-氧戊二酸受体1(OXGR1)是内源性AKG受体,分布于骨骼肌的血管平滑肌(VSM)中。OXGR1基因敲除导致骨骼肌萎缩,伴有肌球蛋白重链I(MyHC I)、毛细血管密度和耐力运动能力的表达降低。此外,研究发现,饮食中补充AKG可以增加小鼠的耐力运动距离、MyHC I/MyHC IIb比率、骨骼肌中的小动脉和毛细血管密度。同时,急性AKG给药使下肢血流量逐渐增加。此外,通过使用OXGR1全局敲除和OXGR1 VSM特异性(MYH11-Cre×OXGR1-FloxP)敲除模型,我们发现VSM中的OXGR1对于AKG诱导的骨骼肌性能的改善至关重要。根据体外研究,AKG在OXGR1降低细胞内pH(pHi)的情况下扩大了VSM中的细胞面积。我们的研究结果证明了AKG/OXGR1在骨骼肌VSM中的新作用,以调节血液流动,然后增强缓慢的肌纤维转化和毛细管作用。这些发现为AKG/OXGR1信号通路维持人体肌肉功能、改善肉类生产和畜禽肉类质量提供了理论基础。
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引用次数: 0
Reprograming yeast for anticancer vinblastine synthesis 重组酵母合成抗癌长春花碱
Pub Date : 2022-09-22 DOI: 10.1093/lifemeta/loac024
Tian Ma, Zixin Deng
In a recent study published in Nature, Zhang et al. employed an innovative approach by reprogramming and engineering yeast strain for combined biosynthesis of vindoline and catharanthine, followed by an additional in vitro chemical step for the successful synthesis of the anticancer vinblastine.
在最近发表在《自然》杂志上的一项研究中,张等人采用了一种创新的方法,对酵母菌株进行重新编程和工程改造,以联合生物合成长春花碱和长春花碱,然后进行额外的体外化学步骤,成功合成抗癌长春花碱。
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引用次数: 0
Less is more: seipin, phospholipids, and embryogenesis 少即是多:磷脂,磷脂和胚胎发生
Pub Date : 2022-09-17 DOI: 10.1093/lifemeta/loac023
Bin Liang, J. Watts
In a recent paper published in Life Metabolism, Zhu et al. revealed that mutations that reduce phosphatidylcholine (PC) synthesis rescue embryonic lethality but exacerbate lipid droplet (LD) abnormalities in C. elegans seipin mutants, demonstrating distinct roles for Seipin in embryogenesis and LD formation.
最近发表在《生命代谢》(Life Metabolism)杂志上的一篇论文中,Zhu等人发现,在秀丽隐杆线虫seipin突变体中,减少磷脂酰胆碱(PC)合成的突变挽救了胚胎致死性,但加剧了脂滴(LD)异常,证明了seipin在胚胎发生和LD形成中的独特作用。
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引用次数: 1
Coldness impedes tumor growth 寒冷阻碍肿瘤生长
Pub Date : 2022-09-15 DOI: 10.1093/lifemeta/loac022
Shudi Luo, Xiaoming Jiang, Zhimin Lu
The Warburg effect is critical for tumor growth. A new study showed that cold acclimatization activates brown adipose tissue, reduces blood glucose levels, and subsequently blunts aerobic glycolysis in cancer and tumor growth
Warburg效应对肿瘤生长至关重要。一项新的研究表明,寒冷环境激活棕色脂肪组织,降低血糖水平,随后使癌症和肿瘤生长中的有氧糖酵解变得迟钝
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引用次数: 0
Reduced phosphatidylcholine synthesis suppresses the embryonic lethality of seipin deficiency 磷脂酰胆碱合成减少可抑制赛品缺乏症的胚胎致死率
Pub Date : 2022-09-08 DOI: 10.1093/lifemeta/loac021
Jinglin Zhu, S. Lam, Lei-lei Yang, Jingjing Liang, Mei Ding, G. Shui, Xun Huang
Seipin plays a vital role in lipid droplet homeostasis and its deficiency causes congenital generalized lipodystrophy type II in humans. It is not known whether the physiological defects are all caused by cellular lipid droplet defects. Loss-of-function mutation of seip-1, the C. elegans seipin ortholog, causes embryonic lethality and lipid droplet abnormality. We uncover nhr-114 and spin-4 as two suppressors of seip-1 embryonic lethality. Mechanistically, nhr-114 and spin-4 act in the “B12-one-carbon cycle-phosphatidylcholine (PC)” axis and reducing PC synthesis suppresses the embryonic lethality of seip-1 mutants. Conversely, PC deficiency enhances the lipid droplet abnormality of seip-1 mutants. The suppression of seip-1 embryonic lethality by PC reduction requires polyunsaturated fatty acid (PUFA). In addition, the suppression is enhanced by knockdown of phospholipid scramblase epg-3. Therefore, seipin and phosphatidylcholine exhibit opposite actions in embryogenesis, while they function similarly in lipid droplet homeostasis. Our results demonstrate that seipin-mediated embryogenesis is independent of lipid droplet homeostasis.
Seipin在脂滴稳态中起着至关重要的作用,其缺乏导致人类先天性全身性脂肪营养不良II型。目前尚不清楚这些生理缺陷是否都是由细胞脂滴缺陷引起的。秀丽隐杆线虫seip1同源基因的功能缺失突变导致胚胎致死性和脂滴异常。我们发现nhr-114和spin-4是seip-1胚胎致死性的两个抑制因子。机制上,nhr-114和自旋-4作用于“b12 -一碳循环-磷脂酰胆碱(PC)”轴,减少PC合成可抑制sei -1突变体的胚胎致死性。相反,PC缺乏增强了seip-1突变体的脂滴异常。通过PC还原抑制sepp -1胚胎致死性需要多不饱和脂肪酸(PUFA)。此外,这种抑制作用通过敲低磷脂重组酶epg-3而增强。因此,在胚胎发生过程中,赛平和磷脂酰胆碱表现出相反的作用,而在脂滴稳态中,它们的功能相似。我们的研究结果表明,sepin介导的胚胎发生不依赖于脂滴的稳态。
{"title":"Reduced phosphatidylcholine synthesis suppresses the embryonic lethality of seipin deficiency","authors":"Jinglin Zhu, S. Lam, Lei-lei Yang, Jingjing Liang, Mei Ding, G. Shui, Xun Huang","doi":"10.1093/lifemeta/loac021","DOIUrl":"https://doi.org/10.1093/lifemeta/loac021","url":null,"abstract":"\u0000 Seipin plays a vital role in lipid droplet homeostasis and its deficiency causes congenital generalized lipodystrophy type II in humans. It is not known whether the physiological defects are all caused by cellular lipid droplet defects. Loss-of-function mutation of seip-1, the C. elegans seipin ortholog, causes embryonic lethality and lipid droplet abnormality. We uncover nhr-114 and spin-4 as two suppressors of seip-1 embryonic lethality. Mechanistically, nhr-114 and spin-4 act in the “B12-one-carbon cycle-phosphatidylcholine (PC)” axis and reducing PC synthesis suppresses the embryonic lethality of seip-1 mutants. Conversely, PC deficiency enhances the lipid droplet abnormality of seip-1 mutants. The suppression of seip-1 embryonic lethality by PC reduction requires polyunsaturated fatty acid (PUFA). In addition, the suppression is enhanced by knockdown of phospholipid scramblase epg-3. Therefore, seipin and phosphatidylcholine exhibit opposite actions in embryogenesis, while they function similarly in lipid droplet homeostasis. Our results demonstrate that seipin-mediated embryogenesis is independent of lipid droplet homeostasis.","PeriodicalId":74074,"journal":{"name":"Life metabolism","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45950703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Impaired condensate formation is to blame for failed disease resistance in plants 凝结水形成受损是植物抗病性失败的原因
Pub Date : 2022-09-01 DOI: 10.1093/lifemeta/loac020
Xiu-Fang Xin, Jian-Min Zhou
{"title":"Impaired condensate formation is to blame for failed disease resistance in plants","authors":"Xiu-Fang Xin, Jian-Min Zhou","doi":"10.1093/lifemeta/loac020","DOIUrl":"https://doi.org/10.1093/lifemeta/loac020","url":null,"abstract":"","PeriodicalId":74074,"journal":{"name":"Life metabolism","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42553266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
期刊
Life metabolism
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