


A glance at the medical journals at any time in the past 20 years will show that lupus, because of its widespread features, has been the focus of very intensive research. Indeed it has provided clues not only to the cause and mechanism of arthritis in general, but also some insight into a variety of other conditions. There is now an international journal, 'Lupus' which publishes monthly research papers on lupus from units all over the world.
A number of small laboratory animals, notably a breed of mice glorying under the name of the "New Zealand Black/White" develop features of SLE. As well as many of the clinical features, their blood also contains LE cells and various antibodies including anti-DNA antibodies. Experimental work on the blood cells of these animals has thrown considerable light on SLE. It has shown how factors such as sex hormones, U V light, drugs etc affect the disease process, and doubtless will contribute to provide important information.
If it is difficult to explain what lupus is, then trying to explain or understand the immune defect in SLE compounds the difficulty. So much detailed work has been done on the immune system in SLE that lupus has become almost the standard by which other studies are made.
Put in scientific jargon, in active lupus there appears to be impairment of the suppressor cells. Perhaps the best analogy is the balance in a country between the police, or the forces of law and order (the suppressor "T" cells) and the population at large (B cells), some of which, if not properly governed, turn anarchic. There is normally a balance. In active lupus, the suppressor T cells seem to fail in their duty, and some B cells become out of control producing the various antibodies characteristic of the disease. Why the failure of the suppressor cells? We don't know, though, it is known that certain virus infections can affect these cells.
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