Sjögren's syndrome: viewpoint on pathogenesis. One of the reasons I was never asked to write a textbook chapter on it.
OBJECTIVE
To critically consider the public opinion/consensus on SS formulated by opinion leaders and textbook chapters.


BACKGROUND
Although our clinical work is based on evidence-based medicine, it is obvious that we do not have evidence-based solutions to the etiology and pathogenesis of autoimmune rheumatic diseases. In spite of this, consensus if often taken as a truth, which may hamper the production, funding and/or publication of new and original ideas and views.


METHODS
Comparison of the classic view with one of the many other possible views.


RESULTS
The consensus view states that 1) SS is initiated and/or caused by an exogenous agent, probably some type of retrovirus, and 2) after initiation, a straightforward sequence of events follows: a) salivary gland epithelial cells are disrupted, b) T lymphocytes migrate to and are activated in the glands, c) B cells get the help they need and start to produce SS and RF autoantibodies, which processes lead to structural destruction and loss of acinar cells and, thus, to sicca symptoms (an example of the linear, step-by-step "computer" logic). The problems inherent to this view include: 1) why women? (gender aspect), 2) why at the age of 50? (chronobiologic aspect), 3) is the normal immune system in SS only responding to normal (formely sequestrated) autoantigens? Is the loss of exocrine gland function really caused by "autoimmune" destruction? - or do the SS-autoantibodies and lymphocyte infiltrates only represent markers in an appropriate HLA background? (autoimmune aspect), 4) are the retroviral diseases really similar to SS? (exogenous rs endogenous causes), 5) is our current view compatible with unexpected, future findings? Is the textbook interpretation the final truth (evolutionary aspect of our view on pathogenesis).


CONCLUSIONS
The tubuloalveolar exocrine glands may be seen as 1) locus minoris resistentiae for normal oral microbial flora and immune-inflammatory attacks at the normal environment-host interface. Apoptotic and/or necrotic cells are released into the intraluminal space and pass in normal glands through normal, immunologically competent lymphocyte foci and/or ectopic lymphatic tissue. Acinar cell degeneration/death may increase upon 2) aging and acinar cell renewal and well-being may be hampered by age-dependent deficiencies in the trophic 3) neuro-endocrine support. In a proper immunogenetic setting, a) marker autoantibodies (e.g. RF, SS-A/Ro, SS-B/La), useful in the diagnosis, are produced. However, sicca symptoms/SS develop only if muscarinic receptor or other b) pathogenetic autoantibodies disrupting the normal neuronal-to acinar cell communication are also produced. c) Systemic symptoms could be produced on neuroendocrine, chronobiologic and autoimmune basis. Other professionals are invited to entertain their own views on the pathogenesis of SS - make your own one!
Konttinen
Yrjö T
YT
Department of Medicine/Invärtes medicin, Helsinki University Central Hospital & ORTON Research Institute and the Orthopaedic Hospital of the Invalid Foundation, Finland. yrjo.konttinen@helsinki.fi
Käsnä-Ronkainen
Lea
L
D006801:Humans; D007108:Immune Tolerance / Q000276:immunology*; D012859:Sjogren's Syndrome / Q000209:etiology* / Q000276:immunology / Q000503:physiopathology