Does Medicine Weaken Your Immune System

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Immunosuppression is a reduction of the activation or efficacy of the immune system. Some portions of the immune system itself have immunosuppressive effects on other parts of the immune system, and immunosuppression may occur as an adverse reaction to treatment of other conditions.

In general, deliberately induced immunosuppression is performed to prevent the body from rejecting an organ transplant, Additionally this is used for treating graft-versus-host disease after a bone marrow transplant, or for the treatment of auto-immune diseases such as systemic lupus erythematosus, rheumatoid arthritis, Sjögren's syndrome, or Crohn's disease. This is typically done using medications, but may involve surgery (splenectomy), plasmapharesis, or radiation. A person who is undergoing immunosuppression, or whose immune system is weak for some other reasons ( chemotherapy or HIV), is said to be immunocompromised.


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Deliberately induced

Administration of immunosuppressive medications or immunosuppressants is the main method of deliberately induced immunosuppression, in optimal circumstances, immunosuppressive drugs are targeted only at any hyperactive component of the immune system People with previous cancer who require immunosuppression are not more likely to have a recurrence, throughout its history, radiation therapy has been used to decrease the strength of the immune system. Dr. Joseph Murray of Brigham and Women's Hospital, was given the Nobel Prize in Physiology or Medicine in 1990 for work on immunosuppression.

Immunosuppressive drugs have the potential to cause immunodeficiency, which can cause increased susceptibility to opportunistic infections and decreased cancer immunosurveillance. Immunosuppressants may be prescribed when a normal immune response is undesirable, such as in autoimmune diseases

Steroids were the first immunosuppressant identified, but its side-effects limited its use, the more specific azathioprine was identified in 1960, but it was the discovery of ciclosporin in 1980(together with azathioprine) that allowed significant expansion of transplantation to less well-matched donor-recipient pairs as well as broad application to lung transplantation, pancreas transplantation, and heart transplantation. After an organ transplantation, the body will nearly always reject the new organ(s) due to differences in human leukocyte antigen between the donor and recipient. As a result, the immune system detects the new tissue as "foreign", and attempts to remove it by attacking it with white blood cells, resulting in the death of the donated tissue, immunosuppressants are given as an attempt to prevent this rejection; the side-effect is that the body becomes more vulnerable to infections and malignancy.


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Non-deliberate immunosuppression

Non-deliberate immunosuppression can occur in, for example, Ataxia-telangiectasia, Complement deficiencies, many types of cancer, and certain chronic infections such as Human Immunodeficiency virus (HIV). The unwanted effect in non-deliberate immunosuppression is immunodeficiency that results in increased susceptibility to pathogens such as bacteria, and viruses

Immunodeficiency is also a potential adverse effect of many immunosuppressant drugs, in this sense, the scope of the term immunosuppression in general includes both beneficial and potential adverse effects of decreasing the function of the immune system

B cell deficiency and T cell deficiency are immune impairment that individuals are born with or are acquired, which in turn can lead to immunodeficiency problems (Nezelof syndrome is an example of a immunodeficiency of T-cells.).

Source of the article : Wikipedia



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