@Snow Leopard Stupid question but how is autoimmunity or auto-antibodies perpetuated? I have been trying to grasp this myself. I know the immune system shifts to the TH2 side (or whatever you want to call it) but what makes it stay there? What makes someone develop auto-antibodies (like the calcium channel antibodies, etc?) No worries if you don't know since many docs don't even know!
Jonathan Edwards has had a bit to say on this topic!
Summary of points:
Alteration in T-Cell phenotype or activation is not necessary for most autoimmune processes (all of the autoimmune conditions associated with autoantibodies). As an aside, I note that JE also doesn't think much of the benefit of dividing activated T-helper groups into 'Th1/Th2' groups)
Evidence to date about environmental factors perpetuating autoimmune disease is severely lacking - regardless of viral, dietary, poisons, mould, psychological stress etc. Despite such claims being regularly made by doctors.
(lacking beyond the trivial, eg Coeliac Disease requires Gluten exposure - but that doesn't exactly explain the illness)
Autoantibody syndromes persist due to the specific autoantibodies themselves interfering with the regulation and promoting the survival of those B-Cells (and/or plasma cells) that will end up producing those autoantibodies in the future. Specifically, it is not merely the presence of antibodies that attach to self-antigens that is important, but rather the presence of dysregulated antibody production due to feedback loops!
The specific shape of an antibody itself is due to stochastic factors. Which is to say it is due to chance.
It is not necessary for T-Cells to lose tolerance to self antigens for B-cell autoimmunity to persist. It is possible for a B-Cell receptor to be sensitive to a self-antigen, yet internalise both that self-antigen and a foreign antigen that may also be attached to it. If the B-Cell was to then present fragments of the foreign antigen on the MHC-II receptor, then it is possible for a T-Cell to activate that B-Cell, without any T-Cell receptors being sensitive to self-antigens. This has been clearly demonstrated in the case of Rheumatoid factors (that are basically antibodies that stick to other antibodies), I believe this evidence is mentioned in the JE paper below. If the B-Cell manages to survive to become an antibody producing plasma-cell, then a feedback loop could be induced. This process happens at a background level all the time (no one has zero autoantibodies), however most of the time these antibodies do not produce a sufficient feedback loop, hence no autoimmune illness is induced.
This process would primarily happen due to chance, although in my opinion it is possible that the initial trigger could be increased due to infection - but it needs specific things to happen, namely the self-antigen must readily form a complex with the foreign antigen, for the B-Cell to make the initial mistake. Once such a feedback loop has been induced however, it is no longer necessary for the infection or whatever to remain.
Apart from forum posts. you can read some of Jonathan's comments here:
https://www.researchgate.net/post/Are_there_studies_on_the_incidence_of_autoimmunity_in_spouses
And the 1999 article:
https://www.researchgate.net/public..._B_lymphocytes_drive_human_autoimmune_disease