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Altered oligosaccharides as the initiating autoantigen in rheumatoid arthritis
Abstract:
The linkage of rheumatoid arthritis (RA) to infection though vague has remained a persistent notion for the past fifty years. The hypotheses that streptococcus was responsible; then M. Pneumoniae; the implication of a viral pathogenesis and, more especially, the Epstein-Barr virus, have all not withstood the test of Koch's postulates. Today, autoimmunity holds the field in the pathogenesis of RA. We know in fair detail what happens after failure of self-recognition develops. Why does synovial tissue become antigenic? Altered receptors of cell surface may be the loci of change, namely, glycoproteins and glycolipids. A hypothesis is constructed based on alteration by viral DNA of these cell surface markers that are then recognized as alien. Evidence is drawn from insulin dependent juvenile diabetes, glomerulonephritis, and Landsteiner blood groups. The initial lesion may be initiated by an infectious agent leading to a chain of events, the first link constituting change of the specific glycoprotein or glycolipid of a cell to one of antigenic challenge, thus stimulating an autoimmune reaction. The ultimate destructive-proliferative sequences of RA are then set in motion.
Insights
Infectious agents may trigger rheumatoid arthritis (RA) by altering cell surface markers, initiating an autoimmune response. This leads to the characteristic destructive and proliferative joint tissue damage seen in RA.
Area of Science:
- Immunology
- Rheumatology
- Pathogenesis
Background:
- The link between infection and rheumatoid arthritis (RA) has been hypothesized for decades.
- Previous theories involving Streptococcus, Mycoplasma pneumoniae, and Epstein-Barr virus have not been definitively proven.
- Current understanding focuses on autoimmunity in RA pathogenesis, with the mechanisms of synovial tissue antigenicity remaining unclear.
Purpose of the Study:
- To propose a hypothesis for RA pathogenesis involving infectious agents and autoimmunity.
- To explore the role of altered cell surface glycoproteins and glycolipids in initiating autoimmune responses in RA.
- To connect viral DNA alterations of cell surface markers to the development of RA.
Main Methods:
- Literature review and hypothesis construction.
- Analysis of evidence from related autoimmune conditions and blood group genetics.
- Conceptual framework linking infectious triggers to autoimmune reactions via altered cell surface markers.
Main Results:
- A hypothesis is presented where infectious agents alter cell surface glycoproteins/glycolipids.
- These alterations create "alien" markers, triggering an autoimmune response.
- This autoimmune reaction initiates the destructive-proliferative processes characteristic of RA.
Conclusions:
- Infectious agents may initiate RA by causing changes in cell surface molecules, leading to autoimmunity.
- Altered glycoproteins and glycolipids serve as the critical link between infection and the autoimmune cascade in RA.
- This proposed mechanism provides a framework for understanding the initial events in rheumatoid arthritis pathogenesis.