IMMUNOLOGY AND MEDICINE
Immunological concepts have found
ample applications in medicine in areas related to di-agnosis, treatment,
prevention, and pathogenesis.
1. The exquisite specificity of the antigen-antibody
reaction has been extensively applied to the development of diagnostic assays
for a variety of substances. Such applications received a strong boost when
experiments with malignant plasma cell lines and normal antibody-producing
cells resulted serendipitously in the discovery of the technique of hybridoma
production, the basis for the productio of monoclonal antibodies, which have
had an enormous impact in the fields of diagnosis and immunotherapy.
2. Immunotherapy is a field with enormous
possibilities, although the results of many attempts at the therapeutic
application of immune strategies have been disappointing. Nevertheless,
stimulation of the immune system with cytokines (particularly IL-2), downregulation
of inflammatory reactions with anticytokine antibodies or recombinant soluble
receptors, treatment of leukemia with monoclonal antibodies and immunotoxins,
and prevention of graft rejection with monoclonal antibodies are but a few
examples of successful medial applications of immunotherapy protocols.
3. The study of children with deficient immune
system development (immunodeficiency disease) has provided the best tools for
the study of the immune system in humans, while at the same time giving us
ample opportunity to devise corrective therapies. The acquired immunodeficiency
syndrome (AIDS) underscored the delicate balance that is maintained between the
immune system and infectious agents in the healthy individual and has
stimulated a considerable amount of basic research into the regulation of the
immune system that may have enormous implications not only in the treatment of
HIV/AIDS, but in many other areas of medicine.
4. The importance of maintaining self-tolerance in
adult life is obvious when we consider the consequences of the loss of
tolerance. Several diseases, some affecting single organs, others of a systemic
nature, have been classified as autoimmune diseases. In such diseases the
immune system reacts against cells and tissues; this reactivity can either be
the primary insult leading to the disease or represent a factor contributing to
the evolution and increasing severity of the disease. New knowledge of how to
induce a state of unresponsiveness in adult life through oral ingestion of antigens
has raised hopes for the rational treatment of autoimmune conditions.
5. Not all reactions against nonself are beneficial.
If and when the delicate balance that keeps the immune system from overreacting
is broken, hypersensitivity diseases may become manifest. Common allergies,
such as asthma and hay fever, are prominent examples of diseases caused by
hypersensitivity reactions. Manipulation of the immune response to induce a
protective rather than harmful immunity was first attempted with success in
this type of disease.
6. Research into the mechanisms underlying the
normal state of tolerance against nonself attained during normal pregnancy
continues to be intensive, since this knowledge could be the basis for more
effective manipulations of the immune response in patients needing organ
transplants and for the treatment or prevention of infertility.
7 The concept that malignant mutant cells are
constantly being eliminated by the immune system (immune surveillance) and that
malignancies develop when the mutant cells escape the protective effects of the
immune system has been extensively debated, but not quite proven. However,
anticancer therapies directed at the enhancement of antitumoral responses
continue to be evaluated, and some have met with encouraging results.
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