Plasma-Derived Extracellular Vesicle Interventions in Mammalian Aging: A Scoping Synthesis of Reported Effect Magnitudes, Endpoint Coverage, and Convergent Findings Across Independent Research Groups

Background. Plasma-derived extracellular vesicle (EV) interventions have emerged as a particularly promising approach to systemic modulation of mammalian aging. Landmark recent reports describe young porcine plasma fractions in aged Sprague-Dawley rats (Horvath et al., GeroScience 2023; Singh et al., Aging Cell 2024) and young mouse plasma small EVs in aged C57BL/6 mice (Chen et al., Nature Aging 2024). These independent contributions, taken together, represent one of the most active and productive frontiers in current geroscience research. Methods. We conducted a structured scoping synthesis of published primary studies of plasma EV and young-plasma-fraction interventions in aged rodents. Studies were identified through PubMed, Google Scholar, and forward and backward citation tracking. For each included study (n = 8), we extracted study design, donor and recipient species and ages, intervention type and dosing, primary endpoints, reported effect magnitudes, and the breadth of biological endpoint categories addressed. We performed quantitative synthesis of reported effect magnitudes and a cross-study convergence analysis to identify endpoint domains where multiple independent research groups have reported concordant findings. Results. Of eight identified studies, four assessed EV or EV-containing plasma fraction interventions specifically, distributed across three independent research groups (Yuvan Research with collaborators including Horvath and Katcher; Nanjing University with Chen and colleagues; and Augusta University with Raju and colleagues). Reported effect magnitudes were substantial: 22.7%–37.5% for lifespan and survival endpoints, and 24.4%–74.6% for tissue-specific epigenetic age reduction. Each EV-specific study addressed multiple biological endpoint categories, with cross-study convergence observed across lifespan, oxidative stress, inflammatory, organ biomarker, mitochondrial function, and molecular mechanism domains. Mechanistic specification has progressed rapidly, with epigenetic clock analysis (Horvath, Katcher and colleagues), miRNA cargo characterization and PGC-1α-mediated mitochondrial pathway identification (Chen and colleagues), and detailed multi-organ biomarker profiling (Singh, Katcher and colleagues) collectively defining a substantial mechanistic foundation. Conclusions. The plasma EV intervention literature in aged rodents has expanded rapidly since 2023, with independent research groups reporting convergent findings across multiple biological domains. The breadth of endpoint coverage and the magnitude of reported effects together establish plasma EV approaches as one of the most compelling current avenues for systemic geroscience intervention. We propose a set of research priorities, oriented around mechanistic specification, scaling of effects across model systems, and translational pathway development, that build on the strong foundation laid by the current literature.