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Scleroderma
Group of autoimmune diseases resulting in abnormal growth of connective tissue

Scleroderma is a group of autoimmune diseases causing changes to the skin, blood vessels, muscles, and internal organs. It can be localized or systemic, with symptoms like thickened skin, stiffness, and poor blood flow. A subtype, CREST syndrome, features calcium deposits, Raynaud's syndrome, and skin thickening. The cause is unknown but involves an abnormal immune response affecting connective tissue. Diagnosis relies on symptoms plus a skin biopsy or blood tests. Treatments like corticosteroids and methotrexate help manage symptoms. Life expectancy varies, with systemic disease having a more serious prognosis.

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Signs and symptoms

Potential signs and symptoms include:26272829

Cause

Scleroderma is caused by genetic and environmental factors.30313233 Mutations in HLA genes seem to play a crucial role in the pathogenesis of some cases; likewise silica, aromatic and chlorinated solvents, ketones, trichloroethylene, welding fumes, and white spirits exposure seems to contribute to the condition in a small proportion of affected persons.3435363738

Pathophysiology

Scleroderma is characterised by increased synthesis of collagen (leading to the sclerosis), damage to small blood vessels, activation of T lymphocytes, and production of altered connective tissue.39 Its proposed pathogenesis is the following:4041424344

  • It begins with an inciting event at the level of the vasculature, probably the endothelium. The inciting event is yet to be elucidated, but may be a viral agent, oxidative stress, or autoimmune. Endothelial cell damage and apoptosis ensue, leading to the vascular leakiness that manifests in early clinical stages as tissue oedema. At this stage, it is predominantly a Th1- and Th17-mediated disease.
  • After this, the vasculature is further compromised by impaired angiogenesis and impaired vasculogenesis (fewer endothelial progenitor cells), likely related to the presence of antiendothelinal cell antibodies (AECA). Despite this impaired angiogenesis, elevated levels of pro-angiogenic growth factors such as PDGF and VEGF is often seen in persons with the condition. The balance of vasodilation and vasoconstriction becomes askew, and the net result is vasoconstriction. The damaged endothelium then serves as a point of origin for blood-clot formation and further contributes to ischaemia-reperfusion injury and the generation of reactive oxygen species. These later stages are characterised by Th2 polarity.
  • The damaged endothelium upregulates adhesion molecules and chemokines to attract leucocytes, which enables the development of innate and adaptive immune responses, including loss of tolerance to various oxidised antigens, which includes topoisomerase I. B cells mature into plasma cells, which furthers the autoimmune component of the condition. T cells differentiate into subsets, including Th2 cells, which play a vital role in tissue fibrosis. Anti–topoisomerase 1 antibodies, in turn, stimulate type I interferon production.
  • Fibroblasts are recruited and activated by multiple cytokines and growth factors to generate myofibroblasts. Dysregulated transforming growth factor β (TGF-β) signalling in fibroblasts and myofibroblasts has been observed in multiple studies of scleroderma-affected individuals. Activation of fibroblasts and myofibroblasts leads to excessive deposition of collagen and other related proteins, leading to fibrosis. B cells are implicated in this stage, IL-6 and TGF-β produced by the B cells decrease collagen degradation and increase extracellular matrix production. Endothelin signalling is implicated in the pathophysiology of fibrosis.45

Vitamin D is implicated in the pathophysiology of the disease. An inverse correlation between plasma levels of vitamin D and scleroderma severity has been noted, and vitamin D is known to play a crucial role in regulating (usually suppressing) the actions of the immune system.46

Diagnosis

Typical scleroderma is classically defined as symmetrical skin thickening, with about 70% of cases also presenting with Raynaud's phenomenon, nail-fold capillary changes, and antinuclear antibodies. Affected individuals may experience systemic organ involvement. No single test for scleroderma works all of the time, hence diagnosis is often a matter of exclusion. Atypical scleroderma may show any variation of these changes without skin changes or with finger swelling only.47

Laboratory testing can show antitopoisomerase antibodies, like anti-scl70 (causing a diffuse systemic form), or anticentromere antibodies (causing a limited systemic form and the CREST syndrome). Other autoantibodies can be seen, such as anti-U3 or anti-RNA polymerase.48 Antidouble-stranded DNA autoantibodies are likely to be present in serum.

Differential

Diseases that are often in the differential include:49

Classification

Scleroderma is characterised by the appearance of circumscribed or diffuse, hard, smooth, ivory-colored areas that are immobile and which give the appearance of hidebound skin, a disease occurring in both localised and systemic forms:50

Treatment

No cure for scleroderma is known, although relief of symptoms is often achieved; these include treatment of:5152

Systemic disease-modifying treatment with immunosuppressants is often used.535455565758 Immunosuppressants used in its treatment include azathioprine, methotrexate, cyclophosphamide, mycophenolate, intravenous immunoglobulin, rituximab, sirolimus, alefacept, and the tyrosine kinase inhibitors, imatinib, nilotinib, and dasatinib.5960616263646566

Experimental therapies under investigation include endothelin receptor antagonists, tyrosine kinase inhibitors, beta-glycan peptides, halofuginone, basiliximab, alemtuzumab, abatacept, and haematopoietic stem cell transplantation.6768

Immunomodulatory agents in the treatment of scleroderma
INNMechanism of action6970Route of administration71Pregnancy category7273Major toxicities74
AlefaceptMonoclonal antibody to inhibit T lymphocyte activation by binding to CD2 portion of human leukocyte function antigen-3.IMB (US)Malignancies, injection site reactions, blood clots, lymphopenia, hepatotoxicity and infections.
AzathioprinePurine analogue that inhibits lymphocyte proliferation via conversion to mercaptopurinePO, IVD (Au)Myelosuppression and rarely malignancy, hepatitis, infection, hepatic sinusoidal obstruction syndrome and hypersensitivity reactions.
CyclophosphamideNitrogen mustard that cross-links DNA base pairs, leading to breakages and triggering apoptosis in haematopoietic cells.PO, IVD (Au)Vomiting, myelosuppression, haemorrhagic cystitis and rarely heart failure, pulmonary fibrosis, hepatic sinusoidal obstruction syndrome, malignancy and SIADH
DasatinibTyrosine kinase inhibitor against various proangiogenic growth factors (including PDGF and VEGF).POD (Au)Fluid retention, myelosuppression, haemorrhage, infections, pulmonary hypertension, electrolyte anomalies and uncommonly hepatotoxicity, heart dysfunction/failure, myocardial infarction, QT interval prolongation, renal failure and hypersensitivity.
ImatinibAs abovePOD (Au)As above and rarely: GI perforation, avascular necrosis and rhabdomyolysis
ImmunoglobulinImmunoglobulin, modulates the immune system.IVN/AVaries
MethotrexateAntifolate; inhibits dihydrofolate reductase.PO, IV, IM, SC, ITD (Au)Myeosuppression, pulmonary toxicity, hepatotoxicity, neurotoxicity and rarely kidney failure, hypersensitivity reactions, skin and bone necrosis, and osteoporosis
MycophenolateInosine monophosphate dehydrogenase inhibitor, leading to reduced purine biosynthesis in lymphocytes.PO, IVD (Au)Myelosuppression, blood clots, less commonly GI perforation/haemorrhage and rarely pancreatitis, hepatitis, aplastic anaemia and pure red cell aplasia.
NilotinibAs per dasatinibPOD (Au)As per imatinib
RituximabMonoclonal antibody against CD20, which is expressed on B lymphocytesIVC (Au)Infusion-related reactions, infection, neutropenia, reduced immunoglobulin levels, arrhythmias, less commonly anaemia, thrombocytopenia, angina, myocardial infarction, heart failure, and rarely haemolytic anaemia, aplastic anaemia, serum sickness, severe skin conditions, pulmonary infiltrates, pneumonitis, cranial neuropathy (vision or hearing loss) and progressive multifocal leucoencephalopathy.
SirolimusmTOR inhibitor, thereby reducing cytokine-induced lymphocyte proliferation.POC (Au)Neutropenia, hypokalaemia, interstitial lung disease, pericardial effusion, pleural effusion, less commonly pulmonary haemorrhage, nephrotic syndrome, and rarely hepatotoxicity and lymphoedema.
PO = Oral. IV = Intravenous. IM = Intramuscular. SC = Subcutaneous. IT = Intrathecal.

The preferred pregnancy category, above, is Australian, if available. If unavailable, an American one is substituted.

Prognosis

As of 2012[update], the five-year survival rate for systemic scleroderma was about 85%, whereas the 10-year survival rate was just under 70%.75 This varies according to the subtype; while localized scleroderma rarely results in death, the systemic form can, and the diffuse systemic form carries a worse prognosis than the limited form. The major scleroderma-related causes of death are: pulmonary hypertension, pulmonary fibrosis, and scleroderma renal crisis.76 People with scleroderma are also at a heightened risk for developing osteoporosis and for contracting cancer (especially liver, lung, haematologic, and bladder cancers).77 Scleroderma is also associated with an increased risk of cardiovascular disease.78

According to a study of an Australian cohort, between 1985 and 2015, the average life expectancy of a person with scleroderma increased from 66 years to 74 years (the average Australian life expectancy increased from 76 to 82 years in the same period).79

Epidemiology

Scleroderma most commonly first presents between the ages of 20 and 50 years, although any age group can be affected.8081 Women are four to nine times more likely to develop scleroderma than men.82

This disease is found worldwide.83 In the United States, prevalence is estimated at 240 per million and the annual incidence of scleroderma is 19 per million people.84 Likewise in the United States, it is slightly more common in African Americans than in their white counterparts. Choctaw Native Americans are more likely than Americans of European descent to develop the type of scleroderma that affects internal organs.85 In Germany, the prevalence is between 10 and 150 per million people, and the annual incidence is between three and 28 per million people.86 In South Australia, the annual incidence is 23 per million people, and the prevalence 233 per million people.87

Pregnancy

Scleroderma in pregnancy is a complex situation; it increases the risk to both mother and child.88 Overall, scleroderma is associated with reduced fetal weight for gestational age.89 The treatment for scleroderma often includes known teratogens such as cyclophosphamide, methotrexate, mycophenolate, etc., so careful avoidance of such drugs during pregnancy is advised.90 In these cases hydroxychloroquine and low-dose corticosteroids might be used for disease control.91

See also

References

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