@nandixon We have to also remember the researcher who worked on the nanoneedle has moved to a new position at UC Irvine so perhaps that has slowed down the work, even if he is still involved. It's taken 2 years to test 40 patients so it is clearly a slow process and the nanoneedle needs improved for throughput.
One concern I have is that when PBMC's become activated using an activation compound their cellular impedance has been shown to change ~5x in papers [
1]. It has also been shown that many rheumatic diseases and infections change the threshold at which PBMC's activate [
3]. Karl Morten highlighted that PBMC's left in a tube start to become activated as part of his work on the Accumen mitochondrial function test failed replication [
2]. This would seem to indicate that very fresh blood may be required for the plasma swap experiments if they are using immune cells.
Last week I emailed Alain Moreau to see if he has tried the same salt test on PBMC's + plasma using his CellKey cellular impedance analyzer but have not heard back yet. At the Stanford symposium he presented using the CellKey to test drugs by looking for a change in impedance of Jurkat cells soaked in patient plasma. If I understand right, Jurkat cells are a similar size to PBMC's.
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I did also suggest to Alain Moreau about using Lymphoblast cells similar to Paul Fisher, that way the experiments would use patient cells rather than purchased/grown cell lines.
EDIT : Add references
1. Activated PBMC cellular impedace - see supplemental fig 1
https://www.ncbi.nlm.nih.gov/pubmed/23483079
2. Activation of PBMC's over time observation by Karl Morten
https://www.meassociation.org.uk/wp...al-Function-in-MECFS-Acumen-Test-21.08.19.pdf
3. "Bioenergetics of immune cells to assess rheumatic disease activity and efficacy of glucocorticoid treatment"
https://ard.bmj.com/content/62/2/133
EDIT2: In the s4me Karl Morten Q&A videos released this week I did suggest in the questions that he look at cellular respiration using the same salt solution + plasma + cells to see if oxygen consumption differences can be seen on different equipment to the nanoneedle. He said in the video that he has put this on his to do list. This should be a fairly simple experiment. If patient cells + plasma are working harder to remove salt than healthy cells + plasma then that may be detectable by the change in cellular respiration when the salt is added. He did also add that type of cell + collection & storage method of plasma did affect his cellular respiration tests and he wants to get a better handle on what those variables are.