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  1. 1 Discuss the implications of 250x fold elevations of spike protein detectable in a patient's exosomes, with zero spike detectable in plasma or immune cells + a private exchange
  2. 2 Maugeri et al 2019 note that transcytosis is consistent with their findings on mRNA-LNP delivery. Is this transfection, rather than transcytosis? + a private exchange
  3. 3 How do later studies explain mRNA-LNP crossing the BBB? + a private exchange
  4. 4 You stated earlier that, "Transcytosis would mean the intact LNP crosses the BBB and then transfects brain cells (neurons, astrocytes, microglia) on the other side. Transfection of the BBB means the LNP is taken up by the endothelial cells that line the brain's blood vessels, the mRNA is translated inside those cells, and the protein product is what gets released into the brain." Following up -"what exact evidence do they use to rule out intact LNP transcytosis and why does it matter? + a private exchange
  5. 5 Either way, in this patient's case 2P S can be delivered across the BBB, by process of transcytosis at least. Explain the likely effects of such a process + a private exchange
  6. 6 Tell me about the likely implications for disease-injury processes once 2P spike has been transcytosed across the BBB. + a private exchange
  7. 7 Which specific injury mechanisms are most likely after BBB crossing? + a private exchange
  8. 8 to what extent are these pathways consistent with neuro-inflammation and, in effect, autoimmune encephalitic processes? + a private exchange
  9. 9 How do these mechanisms differ between infection-related encephalitis and autoimmune? + a private exchange
  10. 10 Please share more about The 2025 PANS/PANDAS review - with references - that shows autoantibodies to striatal cholinergic interneurons, Th17-driven BBB disruption, and microglial activation. What were the symptoms specificially associated with such striatal cholinergic interneurons + a private exchange
  11. 11 How do infection-related encephalitis mechanisms compare to BBB/Th17 autoimmunity? + a private exchange
  12. 12 To what extent can these Th17-autoantibody mechanisms be characterised as T and B cell mediated humoral autoimmunity + a private exchange
  13. 13 What evidence would distinguish humoral autoimmunity from innate Th17? + a private exchange
  14. 14 You state, "if a patient has humoral autoimmunity, with high titres of serum autoantibodies against known self-antigens." Such as what? + a private exchange
  15. 15 Hmm. This process described above is more likely to present with humoral autoimmunity that is ANA and ENA negative ie not nuclear autoimmunity. + a private exchange
  16. 16 But, as established before, such patients have no N in exosomes. It is not WT, but 2P spike in play. + a private exchange
  17. 17 What studies compare 2P spike vs wild-type spike in exosome loading? + a private exchange
  18. 18 iF the evidence does show is that spike protein from natural infection is actively packaged into exosomes, how long can it persist given the relative fragility of the molecule compared with the 2P mutated version? + a private exchange
  19. 19 You say, "For spike to still be in circulating exosomes five years later, either the protein must be continuously produced from a persistent mRNA reservoir, or it must be recycled through cells repeatedly." Recycled by transcytosis. My point entirely. + a private exchange
  20. 20 the mechanism would require continuous production or near-total recycling failure. Pse examine both scenarios, and if transcytosis recycled spike, what cell pathway would recreate it long-term? + a private exchange
  21. 21 With respect, Bansal et al 2021 demonstrated exosome titres that were not zero after 4 months. No follow ups on trial subjects beyond 4 months. Absence of evidence.......etc + a private exchange
  22. 22 Perhaps such as study should be conducted as a matter of urgency.
  23. 23 Please could you provide more information on :"The 2021 study on exosomal miRNAs that inhibit spike expression 1 adds a layer: young people and exercisers have higher levels of four miRNAs that directly suppress spike translation, which could influence how long exosomal spike persists in different individuals."

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Please could you provide more information on :"The 2021 study on exosomal miRNAs that inhibit spike expression 1 adds a layer: young people and exercisers have higher levels of four miRNAs that directly suppress spike translation, which could influence how long exosomal spike persists in different individuals."

Sep 6, 2026 · 1 sources used · OpenNeedle synthesis
The short version: the 2021 study is real and its mechanism is sound, but it studied natural infection, not mRNA vaccination. Nothing here shows that these miRNAs affect how long exosomal spike persists after a vaccine.

The study you're asking about is a 2021 paper in Signal Transduction and Targeted Therapy [2]. It found that four exosomal miRNAs (miR-7-5p, miR-24-3p, miR-145-5p, miR-223-3p) can directly bind to the SARS‑CoV‑2 spike sequence and suppress its translation. In young people and after 8 weeks of exercise in 36 male cadets, levels of three of these miRNAs (miR-24-3p, miR-145-5p, miR-223-3p) were higher. Exosomes from young and exercised individuals inhibited viral replication more strongly than exosomes from elderly or diabetic donors [2].

But the study used live virus, not mRNA vaccine components. The spike sequence these miRNAs target is the same, so the mechanism likely applies to vaccine-derived spike too. That is biologically plausible but not tested in this paper.

The critical gap is still what it was. This study does not measure how long exosomal spike persists in any group. It shows that young and fit people start with a higher setpoint of anti-spike miRNAs, which could clear spike faster, but it never follows subjects over time. The evidence supports the mechanism but not the duration.

GroupmiRNA levels vs young healthyExosome antiviral effect
Young healthyreferencestrongest inhibition
ElderlymiR-7, -24, -145, -223 all lowerattenuated
Diabeticreducedattenuated
After 8 weeks exercise (cadets)miR-24, -145, -223 increasedenhanced vs pre-exercise

My call: the mechanism is real and the age and exercise gradient is supported by the evidence here, but the duration of exosomal spike persistence after mRNA vaccination has not been measured, so this study does not answer that question. Confidence: high on the mechanism, not clear on whether it shortens spike persistence.

Keep digging

Sources used 1

  1. Decreased inhibition of exosomal miRNAs on SARS-CoV-2 replication underlies poor outcomes in elderly people and diabetic patients Signal Transduction and Targeted Therapy (2021) Thin

    Four circulating exosomal microRNAs (miR-7-5p, miR-24-3p, miR-145-5p, miR-223-3p) are reduced in elderly and diabetic individuals and can directly inhibit SARS-CoV-2 spike (S) protein expression and viral replication, with exosomes from young people and long-term exercise enhanc…

    DOI: 10.1038/s41392-021-00716-y

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