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Microbiology, 2021

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19.2 • Autoimmune Disorders 789<br />

Figure 19.18<br />

(a) Systemic lupus erythematosus is characterized by autoimmunity to the individual’s own DNA and/or proteins. (b) This<br />

patient is presenting with a butterfly rash, one of the characteristic signs of lupus. (credit a: modification of work by Mikael Häggström;<br />

credit b: modification of work by Shrestha D, Dhakal AK, Shiva RK, Shakya A, Shah SC, Shakya H)<br />

CHECK YOUR UNDERSTANDING<br />

• List the ways antibodies contribute to the pathogenesis of myasthenia gravis.<br />

• Explain why rheumatoid arthritis is considered a type III hypersensitivity.<br />

• Describe the symptoms of systemic lupus erythematosus and explain why they affect so many different<br />

parts of the body.<br />

• What is recognized as an antigen in myasthenia gravis?<br />

Table 19.6 summarizes the causes, signs, and symptoms of select autoimmune diseases.<br />

Select Autoimmune Diseases<br />

Disease Cause Signs and Symptoms<br />

Addison<br />

disease<br />

Destruction of adrenal gland cells by<br />

cytotoxic T cells<br />

Weakness, nausea, hypotension, fatigue;<br />

adrenal crisis with severe pain in<br />

abdomen, lower back, and legs;<br />

circulatory system collapse, kidney failure<br />

Celiac disease<br />

Antibodies to gluten become<br />

autoantibodies that target cells of the small<br />

intestine<br />

Severe diarrhea, abdominal pain, anemia,<br />

malnutrition

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