Tingible body macrophages (TBMs) – large phagocytic cells in the germinal centers of secondary lymph nodes – express CD68 protein. These cells normally engulf B cells that have undergone apoptosis after somatic hypermutation. In some people with SLE, significantly fewer TBMs can be found, and these cells rarely contain material from apoptotic B cells. Also, uningested apoptotic nuclei can be found outside of TBMs. This material may present a threat to the tolerization of B cells and T cells. Dendritic cells in the germinal center may endocytose such antigenic material and present it to T cells, activating them. Also, apoptotic chromatin and nuclei may attach to the surfaces of follicular dendritic cells and make this material available for activating other B cells that may have randomly acquired self-specificity through somatic hypermutation. Necrosis, a pro-inflammatory form of cell death, is increased in T lymphocytes, due to mitochondrial dysfunction, oxidative stress, and depletion of ATP.
Inflammation associated with lupus can cause stiffness, swelling, pain, and warmth of the joints, most commonly in the fingers, hands, elbows, ankles, and toes. (8) Most people with lupus will experience joint inflammation at some point, says Caricchio. For many people, joint pain is one of the first symptoms of the disease that they’ll notice and report.
The ACR recommends ANA testing in patients who have two or more unexplained signs or symptoms listed in Table 2.2,20,21 [Reference2—Evidence level C, consensus/expert guidelines] Because of the high rate of false positive ANA titers, testing for systemic lupus erythematosus with an ANA titer or other autoantibody test is not indicated in patients with isolated myalgias or arthralgias in the absence of these specific clinical signs.45 Under most circumstances, a persistently negative ANA titer (less than 1:40) can be assumed to rule out systemic lupus erythematosus.41
For instance, a dermatologist for cutaneous lupus (skin disease), a cardiologist for heart disease, a nephrologist for kidney disease, a neurologist for brain and nervous system disease, or a gastroenterologist for gastrointestinal tract disease. A woman with lupus who is considering a pregnancy needs an obstetrician who specializes in high-risk pregnancies.
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