GENERAL
PRINCIPLES OF IMMUNOSUPPRESSIVE THERAPY
Before describing individual
drugs, it is important to consider three principles of immunosuppressive
therapy. (1) Primary immune responses are
more readily inhibited than are secondary responses. Therefore, components
of the primary phase of the immune
response, such as pro-cessing, proliferation, and differentiation, will be the
most sensitive to drug action. Drugs that are effective in suppressing an
immune response in an unsensitized per-son generally will show much less
effect, if any, in a sen-sitized individual. Once a population of memory cells
has been established, immunosuppressive drugs show little effectiveness. (2) Not all immune responses are equally affected by immunosuppressive drugs.
Cellular and humoral immunity may be affected differentially. Additionally,
the different classes of immune globulins in a humoral response may be variably
affected. (3) Beneficial effects other
than immunosuppression may re-sult from therapy with these drugs. In
particular, the anti-inflammatory properties of certain of these drugs may be
valuable because inflammation often accompanies the immune response. If only an
inflammatory reaction is present, a true antiinflammatory drug, such as a
corti-costeroid, that is devoid of the many side effects of im-munosuppressive
agents should be used.
The focus in the next section
is on immunosuppres-sants that have been shown to be clinically useful. Others
that may hold promise in the future are men-tioned briefly.
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