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SIRT7 regulates dosage compensation and safeguards the female X chromosome

5 days 23 hours ago
Sirtuins are deacetylases implicated in stress responses and longevity in mammals^(1,2). Although their differential impact on disease for the two sexes has been noted^(3-7), the underlying reasons are unclear. Here, using Sirt7 as a model in mice, we examine the mechanisms leading to sex differences and find that Sirt7^(-/-) female mice have decreased fitness throughout their lifespan. Notably, SIRT7 preferentially localizes to the sex chromosomes. In female individuals, SIRT7 loss affects...
Nicolas G Simonet

Minimizing galvanic corrosion for durable anode-less aqueous zinc batteries

5 days 23 hours ago
Anode-less aqueous zinc batteries offer a promising route to energy-dense and intrinsically safe energy storage, yet their practical deployment is hindered by poor reversibility under constrained zinc inventory. Here, we identify galvanic corrosion between deposited zinc and current collectors as a critical but previously underappreciated degradation pathway in anode-less aqueous zinc batteries. A hybrid passivation layer, comprising an electrically insulating polymer matrix embedded with...
Yunxiang Zhao

Cognitive trajectories and mortality risk in older adults: a 9-year follow-up study

5 days 23 hours ago
Cognitive decline is a central feature of aging and a major determinant of disability and mortality. Understanding cognitive trajectories is essential for identifying individuals at risk and informing preventive strategies. In this study, we estimated transition probabilities across cognitive states and examined predictors of cognitive deficit and mortality among 1,413 community-dwelling older adults for nine years. Cognitive status was assessed at baseline and at two follow-up waves (2006,...
Gabriela Cabett Cipolli

Protein Tyrosine Phosphatase 1B-Mediated Granulosa Cell Insulin Resistance Links Metabolic Stress to Aging-Relevant Ovarian Dysfunction and Is Reversed by Gengnianchun

5 days 23 hours ago
Metabolic disorders, particularly insulin resistance, are increasingly recognized as accelerators of female reproductive decline. However, the molecular mechanisms by which peripheral metabolic stress translates into impaired ovarian reserve remain incompletely understood. Here, we propose that protein tyrosine phosphatase 1B (PTP1B), a negative regulator of insulin signaling, serves as a molecular bridge linking systemic insulin resistance to aging-relevant ovarian dysfunction and can be...
Yanqiu Rao

Treg-microglia crosstalk in Alzheimer's disease: stage-dependent dynamics, molecular mechanisms, and translational challenge

5 days 23 hours ago
Alzheimer's disease (AD) is characterized by amyloid-beta (Aβ) deposition, tau hyperphosphorylation, and chronic neuroinflammation. Emerging evidence from preclinical models suggests that aberrant immune crosstalk between regulatory T cells (Tregs) and microglia may contribute to disease progression, though its precise role in human AD remains to be fully elucidated. In rodent models, Tregs have been shown to cross the blood-brain barrier and, through cell-contact-dependent mechanisms and...
Hua Fu