British Medical Bulletin 51:419-436 (1995)
© 1995 The British Council
research-article |
Hypoxia, oxidative stress and rheumatoid arthritis
Inflammation Research Group, London Hospital Medical College Whitechapel, London
Abstract
The synovial cavity has a negative pressure in health. When the joint is exercised, vascular patency is maintained, allowing for nutrition of the avascular cartilage.
In rheumatoid synovitis, the situation is altered. The cavity pressure is raised and upon movement this pressure exceeds the capillary perfusion pressure, causing collapse of the blood vessels. This leads to the production of multiple episodes of hypoxic-reperfusion injury generating reactive oxygen species (ROS). Such ROS oxidise:
- lgG, inducing rheumatoid factor production
- Hyaluronan, leading to hyaluronan fragmentation products which may alter immune function
- Lipids, generating aldehydes which are toxic and may alter T cell/macrophage interactions
- lipoproteins, leading to the production of monocyte chemotactic peptides
Progressive hypoxia alters immune function, predominantly by calcium mediated pathways.
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