#mwgic #2026 #Aging #Healthspan #Fatigue #Mitochondria
https://www.sciencedaily.com/releases/2026/06/260610003119.htm
Researchers discovered that declining levels of phosphatidylcholine may be a major cause of age-related mitochondrial dysfunction and loss of cellular energy. Remarkably, boosting this nutrient restored more youthful mitochondrial performance in aging organisms, suggesting some aspects of aging can be slowed or reversed.
Author summary Cells respond to stress through a conserved pathway known as the Integrated Stress Response (ISR), which modulates cellular homeostasis. A key feature of this response is the production of specific transcription factors that regulate stress-adaptive genes. While the mechanism regulating the canonical transcription factor ATF4 is well understood, how other stress-induced transcription factors are controlled remains unclear. Here, we investigate the regulation of Xrp1, a stress-responsive transcription factor in Drosophila. We show that, unlike ATF4, Xrp1 induction during stress involves not only regulatory sequences in its 5’ leader but also its main open reading frame (ORF) sequence. We further find that the relative ratio of Xrp1 isoforms is not significantly altered during stress, suggesting that its regulation occurs primarily at the post-transcriptional level. Importantly, we demonstrate that Xrp1 has functional roles in disease models. It is required for the survival of light-stressed photoreceptor cells and influences outcomes in parkin mutants. Our work reveals the mechanism of Xrp1 regulation and highlights its importance in disease-related processes.
Friedreich ataxia (FRDA) is a neurodegenerative and cardiac disease caused by GAA repeat expansions within the first intron of the FXN gene, leading to reduced frataxin expression. Frataxin is required for iron sulfur cluster (ISC) biosynthesis, and its deficiency results in multiple cellular dysfunctions, including mitochondrial iron overload. Although altered iron homeostasis has been reported in several frataxin-deficient models and in FRDA patients, its contribution to disease progression remains debated. Here, we used a GAA expansion based Drosophila model of FRDA, termed fhGAAs, to investigate the impact of reducing intestinal iron absorption on disease progression. We first found that iron accumulation was tissue-specific and predominantly affected the central nervous system. Furthermore, glial cells were affected more severely than neurons, suggesting an increased vulnerability of glia to frataxin deficiency. Reducing intestinal iron uptake, either through treatment with bathophenanthroline disulfonic acid (BPS), an extracellular iron chelator, or by gut-specific silencing of the iron transporter Malvolio, nearly doubled fly survival. BPS treatment also improved sensitivity to dietary iron, enhanced locomotor performance, fully restored normal brain size, and prevented glial alterations. Altogether, our findings identify glial cells as early and preferential targets of frataxin deficiency in an iron-dependent manner and support the in vivo relevance of intestinal iron uptake as a potential modulator of disease severity in FRDA. ### Competing Interest Statement The authors have declared no competing interest. AFAF, Call 2023
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Dan Stafford
Biohacking Pathway
