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Rejuvenation dialysis through the placenta (parabiosis experiment)

Image credit: DOI 10.1038/srep27863

Dragan Otasevic

Dragan Otasevic Jul 23, 2020

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During the murine gestation period cut the embryos off of the umbilical cord but leave one or two so that the placenta remains active. Then attach the freed umbilical cords to an old, genetically identical animal’s blood circulation. Keep the mice fixated together throughout the gestation period. This would effectively be dialysis through the placenta - the ultimate stem cell and young blood therapy.

Does the old animal get rejuvenated? 

Repeat the experiment but throughout it include aggressive therapies aimed at eliminating problematic cells (senolytics, chemotherapy, etc). Does this change the outcome as compared to the previous experiment?

Where this could lead eventually

People of the future could bioengineer a rejuvenation organ (permanent mini placenta) which on-demand and indefinitely provides stem cells and any other factors necessary for rejuvenation. With such an organ inside the body, people could focus further on therapies at killing/removing any cells suspected of being damaged.

Alternatively, there could be a device (like a small bioreactor of trophoblast cells) to which humans could periodically connect for rejuvenation dialysis.

longevity parabiosis regeneration

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Creative contributions

Build a placenta-on-a-shunt age-sink, because the real rejuvenation lever may be fetal immune tolerance plus selective cleanup—not raw young blood.

Darko Savic

Darko Savic Jun 22, 2026

I ran this entire session by 4 AI brainstormers. This is the result:

Converge on an embryo-free “Reverse Twin” bioreactor: a placental barrier wrapped around fetal-like support cells that old blood passes by, not through, so it can absorb inflammatory/damaged cargo and return a tolerogenic repair signal. The first win is not proving lifespan extension; it is proving that aged serum exits measurably less inflammatory and more youth-instructive after one pass across a placental interface.
Best move → The recommended direction is an ex vivo Placental Tolerance Sink: decellularized placental ECM or trophoblast-coated microfluidic membrane on one side, fetal endothelial/liver/thymic organoid mix on the other, perfused with aged serum. It wins because it keeps the boldest mechanism—placenta as living dialysis/tolerance organ—while removing the messy embryo tether, letting you test the core claim fast: does a placental interface simultaneously subtract SASP/mtDNA/damaged vesicles and add immune-reset/developmental repair factors?
Next test → Within 48 hours, run aged mouse serum through a two-chamber trophoblast-barrier chip seeded behind the barrier with fetal endothelial/hepatic spheroids; collect inlet vs outlet serum and apply both to aged fibroblasts or macrophages for 24 hours. Success signal: outlet serum shows intact barrier control, lower IL-6/TNF/CCL2/GDF15 and extracellular mtDNA/EV inflammatory cargo, plus induces a clear drop in p16/p21/NF-kB reporter activity while increasing IL-10/TGF-beta/Qa-2-style tolerance markers versus inlet serum and blank-chip control.
Worth keeping
Placenta as an immune-tolerance machine first, rejuvenation-factor source second.
A living age-sink that removes SASP cytokines, damaged vesicles, mtDNA, and inflammatory ligands instead of merely adding young factors.
Decellularized placenta or placental ECM as the vascular scaffold: nature’s prebuilt high-surface-area exchange organ.
Trophoblast barrier as the key interface, because it negotiates blood-contact, immune signaling, and selective molecular exchange.
Fetal liver/endothelial/thymic organoids behind the barrier as the ‘reverse twin’ engine that secretes developmental and tolerogenic cargo.
Pair future senolytics only after mapping timing: first loosen inflammaging, then kill damaged cells, then use the placental sink to clear debris.
Measure immune reprogramming and serum activity, not stem-cell engraftment; the first biomarker win is a pregnant/fetal-tolerance signature in old blood.
Design toward an implantable or wearable periodic shunt: a rejuvenation dialysis cartridge, not a permanent pregnancy mimic.

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General comments

Dragan Otasevic

Dragan Otasevic6 years ago

Is anyone working on something along these lines?

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Antonio Carusillo

Antonio Carusillo6 years ago

You may check out the following: https://www.biorxiv.org/content/10.1101/2020.05.07.082917v1

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