Researchers discover how inflammatory cells migrate from the skin to joints

[Caroline]

You what?? I had no idea..

I am very critical to this explanation,

It is way more logical that the mechanism is different, that in fact the inflammatory substances are spread by the immune system itself.
As we know there is a small cohort of Psoriatic Arthritis patients who don’t or only marginally have Psoriasis, me for instance. This could not be explained by this suggestion.
In the abstract it is also not clear on how these cells are spread.
If you first see these cells in the skin, and later in the joints, it does suggest something like that, but it is no proof as they also can come from another source, that has not been revealed yet… something is triggering the immune system to produces these cells.