Young Plasma Exchange (TPE) Research

Clinical study examining plasma exchange effects on aging biomarkers.

This randomized controlled trial from Charles University in Prague examined whether plasmapheresis alone (plasma removal without young plasma or albumin replacement) could affect epigenetic aging markers and health biomarkers in healthy blood donors. Participants were randomized to receive either 8 or 4 plasmapheresis sessions over an 18-week period using the Haemonetics PCS2 automatic plasma collection system.

The study found beneficial effects on lipid profiles, including decreased total cholesterol, non-HDL cholesterol, and triglycerides. However, epigenetic clock measurements told a different story: DNAmGrimAge, Hannum clock, and Dunedin Pace of Aging all showed increases, suggesting aging acceleration rather than reversal. Hematological changes included increased red cell distribution width and mean corpuscular hemoglobin concentration.

This is a notable negative result for the plasma dilution hypothesis, as it suggests that simple plasma removal without replacement with young factors may not be sufficient to achieve rejuvenation. The authors concluded that the selected protocol did not provide conclusive data supporting anti-aging benefits and called for more research into long-term safety.

This UC Berkeley-led clinical study tested whether therapeutic plasma exchange (TPE) could reverse molecular hallmarks of aging in humans, extending prior mouse parabiosis findings. Eight older patients underwent multiple rounds of TPE while proteomic and molecular analyses compared their blood to young (n=5) and old (n=5) control cohorts.

TPE promoted shifts toward a youthful proteome, restoring regenerative factors and anticancer regulators. Inflammatory response proteins shifted from aged to youthful profiles (p = 4.10E-14), and apoptosis-related proteins showed similar rejuvenation. DNA damage marker 8-OHdG and senescence marker p16 both decreased across TPE rounds. TDP43, a dementia-associated protein, dropped significantly from elevated baseline levels and remained low for one month between rounds.

The authors identified TLR4 as a nodal regulatory point linking JAK-STAT, MAPK, TGF-beta, NF-kB, and Toll-like receptor signaling, suggesting TPE works by diluting age-elevated systemic factors that drive degeneration through multiple pathways. Biological age, calculated from standard deviation of 10 protein noise biomarkers, decreased in all patients by the final round of TPE.

This perspective and review article from the Conboy laboratory at UC Berkeley synthesizes evidence that aging is perpetuated by circulating systemic factors that accumulate with age and impair stem cell activation, leading to tissue decline. The authors summarize how old, damaged tissues secrete factors into circulation that serve as both biomarkers for age-associated pathologies and active inducers of degenerative phenotypes.

The review discusses recent advances using plasmapheresis in both preclinical (mouse heterochronic parabiosis and blood exchange) and clinical settings. The central thesis is that therapeutic plasma exchange can be "repositioned" from its traditional clinical uses to serve as a rejuvenation therapy by diluting the systemic factors that become deleterious at age-elevated levels.

The authors postulate that this approach could be a rapidly effective intervention that recalibrates crucial signaling pathways, including those governing inflammation, fibrosis, and stem cell function, to a more youthful state. This paper laid important groundwork for the subsequent clinical studies by the same group.

This landmark Nature Medicine study demonstrated that systemic factors in young blood can rejuvenate aged brains.

Old mice exposed to young blood through parabiosis or plasma injections showed improved learning, memory, and synaptic plasticity, identifying blood-borne factors that regulate brain aging.

This foundational study demonstrated that exposure to young blood restores regenerative capacity in aged tissues.

Old mice connected to young mice showed enhanced muscle regeneration, liver cell proliferation, and neural stem cell activity, establishing that systemic factors regulate tissue aging.