Other forms of food allergy: symptoms produced by immune complex deposits


        OTHER FORMS OF FOOD ALLERGY: SYMPTOMS PRODUCED BY IMMUNE COMPLEX DEPOSITS
Patients with the autoimmune disease SLE illustrate the sort of symptoms that can be produced when immune complexes are deposited in the blood vessels. Among other things, they suffer from skin rashes, painful joints, and damage to the kidneys and lungs.
All these symptoms are produced by the deposited immune complexes causing inflammation in tiny blood vessels known as capillaries. In the case of the joints, the capillaries supplying blood to the joints become inflamed and this causes pain.
In the kidneys, immune complexes can become deposited around the delicate membranes that do the important job of filtering the blood. Their task is to remove excess salts and certain toxic compounds from the blood so that they can be flushed out of the body in the urine. Proteins in the blood are not normally allowed to escape into the urine, but when there is damage to die structure of the kidney, then this can occur. Because the body's much-needed proteins are being lost in the urine the general state of health will eventually deteriorate, especially in children, who need protein for growth. The failure of the kidneys also means that excess water is retained, so there is puffiness in various parts of the body (oedema).
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