Aging CellPub Date : 2025-01-24DOI: 10.1111/acel.14481
Zahida Sultanova, Aykut Shen, Katarzyna Hencel, Hanne Carlsson, Zoe Crighton, Daniel Clifton, Alper Akay, Alexei A Maklakov
{"title":"Optimising Age-Specific Insulin Signalling to Slow Down Reproductive Ageing Increases Fitness in Different Nutritional Environments.","authors":"Zahida Sultanova, Aykut Shen, Katarzyna Hencel, Hanne Carlsson, Zoe Crighton, Daniel Clifton, Alper Akay, Alexei A Maklakov","doi":"10.1111/acel.14481","DOIUrl":"https://doi.org/10.1111/acel.14481","url":null,"abstract":"<p><p>The developmental theory of ageing proposes that age-specific decline in the force of natural selection results in suboptimal levels of gene expression in adulthood, leading to functional senescence. This theory explicitly predicts that optimising gene expression in adulthood can ameliorate functional senescence and improve fitness. Reduced insulin/IGF-1 signalling (rIIS) extends the reproductive lifespan of Caenorhabditis elegans at the cost of reduced reproduction. Here, we show that adulthood-only rIIS improves late-life reproduction without any detrimental effects on other life-history traits in both benign and stressful conditions. Remarkably, we show that rIIS additively extends late-life reproduction and lifespan when animals are exposed to a fluctuating food environment-intermittent fasting (IF)-resulting in reduced food intake in early adulthood. Full factorial genome-wide RNA-Seq across the life course demonstrated that IF and rIIS modulate the age-specific expression of pro-longevity genes. IF, rIIS and combined IF + rIIS treatment downregulated genes involved in biosynthesis in early life and differentially regulated immunity genes in later life. Importantly, combined IF + rIIS treatment uniquely regulated a large cluster of genes in mid-life that are associated with immune response. These results suggest that optimising gene expression in adulthood can decelerate reproductive ageing and increase fitness.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14481"},"PeriodicalIF":8.0,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aging CellPub Date : 2025-01-24DOI: 10.1111/acel.14438
Kevin Perez, Brenna Swafford, Julia Labadie, Alejandro Ocampo
{"title":"Lifetime age-related changes in clinical laboratory results, aging clocks and mortality predictors in 2412 Golden Retrievers.","authors":"Kevin Perez, Brenna Swafford, Julia Labadie, Alejandro Ocampo","doi":"10.1111/acel.14438","DOIUrl":"https://doi.org/10.1111/acel.14438","url":null,"abstract":"<p><p>In this study, we investigated age-related changes in clinical laboratory data and their association with mortality in dogs from the Golden Retriever Lifetime Study. By analyzing complete blood count (CBC) and biochemistry data from 2'412 Golden Retrievers over 16,678 visits, we observed significant changes during the first 2 years of life and throughout aging. Based on these observations, we developed a biological aging clock using a LASSO model to predict age based on blood markers, achieving an accuracy of R = 0.78. Although the biological age clock and pace of aging did not significantly improve mortality prediction, a model incorporating all blood biomarkers showed better predictive power for lifetime (C-index = 0.763) and 1-year mortality (AUC = 0.817). Our findings underscore the importance of comprehensive blood analysis for aging and mortality prediction in dogs and open the door for the development of novel methods to investigate aging in companion animals.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14438"},"PeriodicalIF":8.0,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aging CellPub Date : 2025-01-24DOI: 10.1111/acel.14424
Grace B Phelps, Jonas Morin, Carla Pinto, Lucas Schoenfeldt, Sebastien Guilmot, Alejandro Ocampo, Kevin Perez
{"title":"Comprehensive evaluation of lifespan-extending molecules in C. elegans.","authors":"Grace B Phelps, Jonas Morin, Carla Pinto, Lucas Schoenfeldt, Sebastien Guilmot, Alejandro Ocampo, Kevin Perez","doi":"10.1111/acel.14424","DOIUrl":"https://doi.org/10.1111/acel.14424","url":null,"abstract":"<p><p>The nematode C. elegans has long served as a gold-standard model organism in aging research, particularly since the discovery of long-lived mutants in conserved aging pathways including daf-2 (IGF1) and age-1 (PI3K). Its short lifespan and small size make it highly suitable for high-throughput experiments. While numerous molecules have been tested for their effects on C. elegans lifespan, consensus is still lacking regarding the most effective and reproducible compounds. Confounding effects, especially those related to drug-bacteria interactions, remain a contentious issue in the literature. In this study, we evaluated 16 of the most frequently reported lifespan-extending molecules in C. elegans, examining their effects on lifespan with two different diets (live and UV-killed OP50). In addition, we assessed the compounds' impact on bacterial growth, their effects on various nematode strains, and the impact of the starting age of treatment. Our findings first confirmed robust lifespan extension by many, but not all, of the 16 tested compounds from the literature, and revealed that some of them could be combined to obtain additive effects. Additionally, we showed that some of these compounds also extend lifespan in the fly D. melanogaster, demonstrating a conserved effect across species. Finally, by expanding our screen to a broader pool of molecules, we identified novel lifespan-extending compounds in C. elegans.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14424"},"PeriodicalIF":8.0,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aging CellPub Date : 2025-01-24DOI: 10.1111/acel.14497
Alva B C Geisen, Natalia Santana Acevedo, Junko Oshima, Marcus Dittrich, Ramya Potabattula, Thomas Haaf
{"title":"rDNA Copy Number Variation and Methylation During Normal and Premature Aging.","authors":"Alva B C Geisen, Natalia Santana Acevedo, Junko Oshima, Marcus Dittrich, Ramya Potabattula, Thomas Haaf","doi":"10.1111/acel.14497","DOIUrl":"https://doi.org/10.1111/acel.14497","url":null,"abstract":"<p><p>Ribosomal RNA is the main component of the ribosome, which is essential for protein synthesis. The diploid human genome contains several hundred copies of the rDNA transcription unit (TU). Droplet digital PCR and deep bisulfite sequencing were used to determine the absolute copy number (CN) and the methylation status of individual rDNA TU in blood samples of healthy individuals. The absolute CN ranged from 243 to 895 (median 469). There was no difference in absolute CN between males and females and no gain or loss of copies with age (15-71 years). The number of rDNA TU with a completely unmethylated (0%) or lowly methylated (1%-10%) promoter region significantly decreased, whereas the number of copies with higher (11%-100%) methylation increased with age. The number of presumably active TU with a hypomethylated (0%-10%) promoter varied from 94 to 277 (median 180), independent from absolute CN. In contrast, the number of inactive hypermethylated (11%-100%) copies strongly increased with absolute CN. Promoter hypermethylation compensates to some extent for the enormous CN variation among individuals. Patients with Werner syndrome, a premature aging syndrome displayed the same CN variation and age-related methylation changes as controls. The role of rDNA CN variation as a modulating factor in human health and disease is largely unexplored. In particular, very low and high CN may be associated with increased disease risk.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14497"},"PeriodicalIF":8.0,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143031602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aging CellPub Date : 2025-01-21DOI: 10.1111/acel.14483
James DeGregori, Katherine J Seidl, Monty Montano
{"title":"Aging and Cancer-Inextricably Linked Across the Lifespan.","authors":"James DeGregori, Katherine J Seidl, Monty Montano","doi":"10.1111/acel.14483","DOIUrl":"https://doi.org/10.1111/acel.14483","url":null,"abstract":"<p><p>Aging (as old man wind) alters the trajectory of cancer (dangerous seas) through changes in the immune system and metabolism (among many others), leading to altered cancer epidemiology, pathogenesis, and therapeutic responses, as represented by the research areas (boats)-artwork by Michael DeGregori.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14483"},"PeriodicalIF":8.0,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aging CellPub Date : 2025-01-20DOI: 10.1111/acel.14484
Kexin Xu, Belinda Hernández, Thalida Em Arpawong, Stephane Camuzeaux, Elena Chekmeneva, Eileen M Crimmins, Paul Elliott, Giovani Fiorito, Beatriz Jiménez, Rose Anne Kenny, Cathal McCrory, Sinead McLoughlin, Rui Pinto, Caroline Sands, Paolo Vineis, Chung-Ho E Lau, Oliver Robinson
{"title":"Assessing Metabolic Ageing via DNA Methylation Surrogate Markers: A Multicohort Study in Britain, Ireland and the USA.","authors":"Kexin Xu, Belinda Hernández, Thalida Em Arpawong, Stephane Camuzeaux, Elena Chekmeneva, Eileen M Crimmins, Paul Elliott, Giovani Fiorito, Beatriz Jiménez, Rose Anne Kenny, Cathal McCrory, Sinead McLoughlin, Rui Pinto, Caroline Sands, Paolo Vineis, Chung-Ho E Lau, Oliver Robinson","doi":"10.1111/acel.14484","DOIUrl":"https://doi.org/10.1111/acel.14484","url":null,"abstract":"<p><p>Metabolomics and epigenomics have been used to develop 'ageing clocks' that assess biological age and identify 'accelerated ageing'. While metabolites are subject to short-term variation, DNA methylation (DNAm) may capture longer-term metabolic changes. We aimed to develop a hybrid DNAm-metabolic clock using DNAm as metabolite surrogates ('DNAm-metabolites') for age prediction. Within the UK Airwave cohort (n = 820), we developed DNAm metabolites by regressing 594 metabolites on DNAm and selected 177 DNAm metabolites and 193 metabolites to construct 'DNAm-metabolic' and 'metabolic' clocks. We evaluated clocks in their age prediction and association with noncommunicable disease risk factors. We additionally validated the DNAm-metabolic clock for the prediction of age and health outcomes in The Irish Longitudinal Study of Ageing (TILDA, n = 488) and the Health and Retirement Study (HRS, n = 4018). Around 70% of DNAm metabolites showed significant metabolite correlations (Pearson's r: > 0.30, p < 10<sup>-4</sup>) in the Airwave test set and overall stronger age associations than metabolites. The DNAm-metabolic clock was enriched for metabolic traits and was associated (p < 0.05) with male sex, heavy drinking, anxiety, depression and trauma. In TILDA and HRS, the DNAm-metabolic clock predicted age (r = 0.73 and 0.69), disability and gait speed (p < 0.05). In HRS, it additionally predicted time to death, diabetes, cardiovascular disease, frailty and grip strength. DNAm metabolite surrogates may facilitate metabolic studies using only DNAm data. Clocks built from DNAm metabolites provided a novel approach to assess metabolic ageing, potentially enabling early detection of metabolic-related diseases for personalised medicine.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14484"},"PeriodicalIF":8.0,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aging CellPub Date : 2025-01-19DOI: 10.1111/acel.14490
Maoju Wang, Song Guo, Lilin Yi, Zhaolun Li, Xiuyu Shi, YePeng Fan, Man Luo, Yan He, Weihong Song, Yehong Du, Zhifang Dong
{"title":"KIF9 Ameliorates Neuropathology and Cognitive Dysfunction by Promoting Macroautophagy in a Mouse Model of Alzheimer's Disease.","authors":"Maoju Wang, Song Guo, Lilin Yi, Zhaolun Li, Xiuyu Shi, YePeng Fan, Man Luo, Yan He, Weihong Song, Yehong Du, Zhifang Dong","doi":"10.1111/acel.14490","DOIUrl":"https://doi.org/10.1111/acel.14490","url":null,"abstract":"<p><p>Alzheimer's disease (AD) is a prevalent neurodegenerative disorder affecting the elderly. The imbalance of protein production and degradation processes leads to the accumulation of misfolded and abnormally aggregated amyloid-beta (Aβ) in the extracellular space and forms senile plaques, which constitute one of the most critical pathological hallmarks of AD. KIF9, a member of the kinesin protein superfamily, mediates the anterograde transport of intracellular cargo along microtubules. However, the exact role of KIF9 in AD pathogenesis remains largely elusive. In this study, we reported that the expression of kinesin family member 9 (KIF9) in the hippocampus of APP23/PS45 double-transgenic AD model mice declined in an age-dependent manner, concurrent with macroautophagy dysfunction. Furthermore, we found that KIF9 mediated the transport of lysosomes through kinesin light chain 1 (KLC1), thereby participating in the degradation of amyloidogenic pathway-related proteins of Aβ precursor protein (APP) in AD model cells through promoting the macroautophagy pathway. Importantly, genetic upregulation of KIF9 via adeno-associated virus (AAV) diminished Aβ deposition and alleviated cognitive impairments in AD model mice by enhancing macroautophagy function. Collectively, our findings underscore the ability of KIF9 to promote macroautophagy through KLC1-mediated anterograde transport of lysosomes, effectively ameliorating cognitive dysfunction in AD model mice. These discoveries suggest that KIF9 may represent a novel therapeutic target for the treatment of AD.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14490"},"PeriodicalIF":8.0,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aging CellPub Date : 2025-01-19DOI: 10.1111/acel.14485
Chaoran Liu, Pui Yan Wong, Nilakshi Barua, Baoqi Li, Hei Yuet Wong, Ning Zhang, Simon Kwoon Ho Chow, Sunny Hei Wong, Jun Yu, Margaret Ip, Wing Hoi Cheung, Gustavo Duque, Christoph Brochhausen, Joseph Jao Yiu Sung, Ronald Man Yeung Wong
{"title":"From Clinical to Benchside: Lacticaseibacillus and Faecalibacterium Are Positively Associated With Muscle Health and Alleviate Age-Related Muscle Disorder.","authors":"Chaoran Liu, Pui Yan Wong, Nilakshi Barua, Baoqi Li, Hei Yuet Wong, Ning Zhang, Simon Kwoon Ho Chow, Sunny Hei Wong, Jun Yu, Margaret Ip, Wing Hoi Cheung, Gustavo Duque, Christoph Brochhausen, Joseph Jao Yiu Sung, Ronald Man Yeung Wong","doi":"10.1111/acel.14485","DOIUrl":"https://doi.org/10.1111/acel.14485","url":null,"abstract":"<p><p>Sarcopenia is an age-related muscle disorder that increases risks of adverse clinical outcomes, but its treatments are still limited. Gut microbiota is potentially associated with sarcopenia, and its role is still unclear. To investigate the role of gut microbiota in sarcopenia, we first compared gut microbiota and metabolites composition in old participants with or without sarcopenia. Fecal microbiota transplantation (FMT) from human donors to antibiotic-treated recipient mice was then performed. Specific probiotics and their mechanisms to treat aged mice were identified. Old people with sarcopenia had different microbial composition and metabolites, including Paraprevotella, Lachnospira, short-chain fatty acids, and purine. After FMT, mice receiving microbes from people with sarcopenia displayed lower muscle mass and strength compared with those receiving microbes from non-sarcopenic donors. Lacticaseibacillus rhamnosus (LR) and Faecalibacterium prausnitzii (FP) were positively related to muscle health of old people, and enhanced muscle mass and function of aged mice. Transcriptomics showed that genes related to tricarboxylic acid cycle (TCA) were enriched after treatments. Metabolic analysis showed increased substrates of TCA cycle in both LR and FP supernatants. Muscle mitochondria density, ATP content, NAD<sup>+</sup>/NADH, mitochondrial dynamics and biogenesis proteins, as well as colon tight junction proteins of aged mice were improved by both probiotics. LR and the combination of two probiotics also benefit intestinal immune health by reducing CD8<sup>+</sup> IFNγ<sup>+</sup> T cells. Gut microbiota dysbiosis is a pathogenesis of sarcopenia, and muscle-related probiotics could alleviate age-related muscle disorders mainly through mitochondria improvement. Further clinical translation is warranted.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14485"},"PeriodicalIF":8.0,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aging CellPub Date : 2025-01-17DOI: 10.1111/acel.14489
Joshua N Farr, David G Monroe, Elizabeth J Atkinson, Mitchell N Froemming, Ming Ruan, Nathan K LeBrasseur, Sundeep Khosla
{"title":"Characterization of Human Senescent Cell Biomarkers for Clinical Trials.","authors":"Joshua N Farr, David G Monroe, Elizabeth J Atkinson, Mitchell N Froemming, Ming Ruan, Nathan K LeBrasseur, Sundeep Khosla","doi":"10.1111/acel.14489","DOIUrl":"10.1111/acel.14489","url":null,"abstract":"<p><p>There is an increasing need for biomarkers of senescent cell burden to facilitate the selection of participants for clinical trials. p16<sup>Ink4a</sup> is encoded by the CDKN2A locus, which produces five variant transcripts in humans, two of which encode homologous p16 proteins: p16<sup>Inka4a</sup>, encoded by p16_variant 1, and p16ɣ, encoded by p16_variant 5. While distinct quantitative polymerase chain reaction primers can be designed for p16_variant 5, primers for p16_variant 1 also measure p16_variant 5 (p16_variant 1 + 5). In a recent clinical trial evaluating the effects of the senolytic combination, dasatinib + quercetin (D + Q), on bone metabolism in postmenopausal women, we found that women in the highest tertile for T-cell expression of p16_variant 5 had the most robust skeletal responses to D + Q. Importantly, the assessment of p16_variant 5 was more predictive of these responses than p16_variant 1 + 5. Here, we demonstrate that in vitro, p16_variant 1 + 5 increased rapidly (Week 1) following the induction of DNA damage, whereas p16_variant 5 increased later (Week 4), suggesting that p16_variant 5 becomes detectable only when the abundance of senescent cells reaches some threshold. Further analysis identified a SASP panel in plasma that performed as well in identifying postmenopausal women with a positive skeletal response to D + Q. Collectively, our findings provide further support for the T-cell p16_variant 5 assay as a biomarker for selecting participants in clinical trials of senolytic interventions. In addition, our data indicate that correlated plasma SASP markers could be used in lieu of the more technically challenging T-cell p16 assay. Trial Registration: ClinicalTrials.gov identifier: NCT04313634.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14489"},"PeriodicalIF":8.0,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Age-Trajectories of Higher-Order Diffusion Properties of Major Brain Metabolites in Cerebral and Cerebellar Gray Matter Using In Vivo Diffusion-Weighted MR Spectroscopy at 3T.","authors":"Kadir Şimşek, Cécile Gallea, Guglielmo Genovese, Stephane Lehéricy, Francesca Branzoli, Marco Palombo","doi":"10.1111/acel.14477","DOIUrl":"https://doi.org/10.1111/acel.14477","url":null,"abstract":"<p><p>Healthy brain aging involves changes in both brain structure and function, including alterations in cellular composition and microstructure across brain regions. Unlike diffusion-weighted MRI (dMRI), diffusion-weighted MR spectroscopy (dMRS) can assess cell-type specific microstructural changes, providing indirect information on both cell composition and microstructure through the quantification and interpretation of metabolites' diffusion properties. This work investigates age-related changes in the higher-order diffusion properties of total N-Acetyl-aspartate (neuronal biomarker), total choline (glial biomarker), and total creatine (both neuronal and glial biomarker) beyond the classical apparent diffusion coefficient in cerebral and cerebellar gray matter of healthy human brain. Twenty-five subjects were recruited and scanned using a diffusion-weighted semi-LASER sequence in two brain regions-of-interest (ROI) at 3T: posterior-cingulate (PCC) and cerebellar cortices. Metabolites' diffusion was characterized by quantifying metrics from both Gaussian and non-Gaussian signal representations and biophysical models. All studied metabolites exhibited lower apparent diffusivities and higher apparent kurtosis values in the cerebellum compared to the PCC, likely stemming from the higher microstructural complexity of cellular composition in the cerebellum. Multivariate regression analysis (accounting for ROI tissue composition as a covariate) showed slight decrease (or no change) of all metabolites' diffusivities and slight increase of all metabolites' kurtosis with age, none of which statistically significant (p > 0.05). The proposed age-trajectories provide benchmarks for identifying anomalies in the diffusion properties of major brain metabolites which could be related to pathological mechanisms altering both the brain microstructure and cellular composition.</p>","PeriodicalId":119,"journal":{"name":"Aging Cell","volume":" ","pages":"e14477"},"PeriodicalIF":8.0,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142996841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}