Daily Archives: 30 April 2024

Recent research uncovers the molecular signature of biological ageing

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The University of Pittsburgh, a renowned institution in the field of ageing research, has achieved a significant milestone. Their researchers have successfully identified blood markers that correspond with an individual’s health and ageing rate. This breakthrough allows for the estimation of a person’s biological age, a measure that reflects the ageing rate of their cells and organs, independent of their actual birthdate.

Published in the esteemed journal Aging Cell, this groundbreaking study sheds light on the biological pathways and compounds that influence ageing rates and paves the way for potential treatments. By understanding the diverse aging processes among individuals, this research proposes new avenues for interventions aimed at slowing down aging and improving the quality of life in old age.

Aditi Gurkar, Ph. D., the study’s lead author and an assistant professor of geriatric medicine at the University of Pittsburgh’s School of Medicine, emphasizes that age should be seen as more than just a number. She illustrates this by comparing two 65-year-olds, one physically active and the other struggling with basic mobility despite having the same chronological age. This disparity in ageing has been the driving force behind Gurkar’s research.

To investigate the variations in aging rates, the lead author, Aditi Gurkar, Ph.D., and her team conducted a comprehensive study. They examined 196 older adults, categorizing them as either healthy or rapid agers based on their performance in simple walking tasks. These tasks, which are indicative of overall health, encompass cardiovascular fitness, physical strength, and neurological condition. Importantly, the study focused on differentiating between biological and chronological aging by selecting rapid agers who were chronologically younger than the healthy agers.

Employing metabolomics, the analysis of metabolites produced by the body’s chemical reactions, the researchers could sketch a molecular blueprint of biological ageing from the participants’ blood samples. Unlike genetic studies, metabolomics offers a dynamic view of ageing since metabolites can change based on lifestyle, diet, and environmental factors, providing a real-time snapshot of one’s health.

The study identified a set of 25 metabolites, termed the Healthy Aging Metabolic (HAM) Index, which could effectively differentiate between healthy and rapid agers. This index proved more accurate than traditional ageing metrics in distinguishing between groups. To further validate their findings, the team applied the HAM Index to an independent group of older adults from Wisconsin, confirming its efficacy in predicting healthy ageing with a significant accuracy rate.

Moreover, the researchers utilized artificial intelligence to pinpoint three key metabolites likely to influence the ageing process significantly. Future studies will explore these metabolites and the molecular pathways they activate, seeking strategies to mitigate rapid ageing.

Gurkar is also planning further research to monitor how the metabolome evolves in younger individuals. The ultimate goal is to develop a blood test that could predict biological age in younger adults, potentially enabling early lifestyle interventions to reverse or slow the ageing process.

This research underscores a paradigm shift towards preventative medicine, focusing on early detection and personalized interventions to delay the onset of age-related diseases and extend the period of good health. Gurkar envisions a future where understanding an individual’s biological ageing process becomes a cornerstone of medical care, emphasizing the importance of prevention in managing the ageing process.

More information: Shruthi Hamsanathan et al, A molecular index for biological age identified from the metabolome and senescence-associated secretome in humans, Aging Cell. DOI: 10.1111/acel.14104

Journal information: Aging Cell Provided by University of Pittsburgh

Disparities in sleep health and insomnia can start early in life

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Most individuals have endured sleepless nights, restlessly trying to drift off or maintain sleep. However, for some, sleep disturbances are not merely sporadic events but persistent issues that can start as early as childhood.

Research spearheaded by a team from Penn State has revealed that children and adolescents from racial and ethnic minority groups are disproportionately plagued by enduring insomnia symptoms that initiate in childhood and persist into young adulthood. The study, in particular, highlighted that Black children are 2.6 times more likely to suffer from these prolonged sleep difficulties when compared to their white peers. Recently published in SLEEP, this research emphasizes the critical need for early detection and intervention of insomnia symptoms with treatments appropriate for different ages.

Julio Fernandez-Mendoza, a professor at the Penn State College of Medicine and the study’s senior author, remarked, “Insomnia is a public health issue.” He pointed out that the prevalence of childhood-onset insomnia, where symptoms begin in early years and continue into young adulthood, is more widespread than previously recognized. He emphasized that, unlike transient childhood sleep disturbances such as sleep terrors or sleepwalking, insomnia does not simply dissipate with puberty and maturation.

Fernandez-Mendoza further explained that insomnia beginning in childhood poses a significant risk of health issues due to the extended period of sleep deprivation. This risk is notably higher among Black and Hispanic/Latino children, who experience disparities in sleep patterns from a young age.

The findings stem from an extensive review of Penn State Child Cohort data. This cohort study, initiated in 2000, initially recruited participants aged between 5 and 12 and followed them through adolescence into young adulthood, with evaluations conducted around the ages of 9, 16, and 24. These assessments, including parental reports during childhood and in-lab sleep studies similar to those used for diagnosing sleep apnea, provided a longitudinal view of sleep evolution across different developmental stages.

The study is pioneering in examining how childhood insomnia symptoms develop and vary among different racial and ethnic groups, addressing a significant research gap, according to Fernandez-Mendoza. Results showed that 23.3% of the participants experienced persistent insomnia symptoms across all three assessment points, and 16.8% developed symptoms during young adulthood. The racial and ethnic breakdown revealed that Black participants predominantly experienced persistent insomnia symptoms, followed by Hispanic/Latino youth.

The data indicated that Black participants were 2.6 times more likely than non-Hispanic white participants to have persistent insomnia symptoms into young adulthood. Moreover, Black children were 3.44 times more likely to see their insomnia symptoms continue rather than resolve after childhood compared to their white counterparts, suggesting that their symptoms were less likely to diminish as they transitioned to adulthood. Hispanic/Latino participants were 1.8 times more likely to experience persistent insomnia symptoms compared to white participants.

Fernandez-Mendoza stressed the importance of not waiting until adulthood to address sleep issues that have been present throughout a person’s life. He advocates for greater attention to insomnia symptoms in children and adolescents, underlining the necessity of proactive healthcare approaches to mitigate the long-term consequences of poor sleep from a young age.

More information: Rupsha Singh et al, Racial/ethnic disparities in the trajectories of insomnia symptoms from childhood to young adulthood, SLEEP. DOI: 10.1093/sleep/zsae021

Journal information: SLEEP Provided by Penn State